المؤلفون: Ilie, Cosmin, Freese, Katherine, Petric, Andreea, Paulin, Jillian

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics

الوصف: The James Webb Space Telescope (JWST) has recently uncovered a new record-breaking quasar, UHZ1, at a redshift of $z\sim10$. This discovery continues JWST's trend of confronting the expectations from the standard $\Lambda$CDM model of cosmology with challenges. Namely, too many very massive galaxies and quasars have been observed at very high redshifts, when the universe was only a few hundred million years old. We have previously shown that Supermassive Dark Stars (SMDSs) may offer a solution to this puzzle. These fascinating objects would be the first stars in the universe, growing to be $\sim 10^5-10^7 M_{\odot}$ and shining as bright as $10^9$ suns. Unlike Population III stars (the major alternative proposed model for the first stars in the universe, which would also have zero metallicity and would be powered by nuclear fusion), SMDSs would be powered by dark matter heating (e.g. dark matter annihilation) and would be comparatively cooler. At the ends of their lives (when they run out of dark matter fuel), SMDSs would directly collapse into black holes, thus providing possible seeds for the first quasars. Previous papers have shown that to form at $z\sim10$, UHZ1 would require an incredibly massive seed ($\sim 10^4 -10^5 M_{\odot}$), which was assumed to be a Direct Collapse Black Hole (DCBH). In this paper, we demonstrate that Supermassive Dark Stars (SMDSs) offer an equally valid solution to the mystery of the first quasars, by examining the four most distant known quasars: UHZ1, J0313-1806, J1342+0928, and J1007+2115, with particular emphasis on UHZ1.

الوصول الحر: http://arxiv.org/abs/2312.13837Test

المؤلفون: Han, Jiwon Jesse, Dey, Arjun, Price-Whelan, Adrian M., Najita, Joan, Schlafly, Edward F., Saydjari, Andrew, Wechsler, Risa H., Bonaca, Ana, Schlegel, David J, Conroy, Charlie, Raichoor, Anand, Drlica-Wagner, Alex, Kollmeier, Juna A., Koposov, Sergey E., Besla, Gurtina, Rix, Hans-Walter, Goodman, Alyssa, Finkbeiner, Douglas, Anand, Abhijeet, Ashby, Matthew, Bahr-Kalus, Benedict, Beaton, Rachel, Behera, Jayashree, Bell, Eric F., Bellm, Eric C, BenZvi, Segev, Silva, Leandro Beraldo e, Birrer, Simon, Blanton, Michael R., Bock, Jamie, Broekgaarden, Floor, Brout, Dillon, Brown, Warren, Brown, Anthony G. A., Bulbul, Esra, Calderon, Rodrigo, Carlin, Jeffrey L, Carrillo, Andreia, Castander, Francisco Javier, Chakraborty, Priyanka, Chandra, Vedant, Chiang, Yi-Kuan, Choi, Yumi, Clark, Susan E., Clarkson, William I., Cooper, Andrew, Crill, Brendan, Cunha, Katia, Cunningham, Emily, Dalcanton, Julianne, Danieli, Shany, Daylan, Tansu, de Jong, Roelof S., DeRose, Joseph, Dey, Biprateep, Dickinson, Mark, Dominguez, Mariano, Dong, Dillon, Eifler, Tim, El-Badry, Kareem, Erkal, Denis, Escala, Ivanna, Fazio, Giovanni, Ferguson, Annette M. N., Ferraro, Simone, Filion, Carrie, Forero-Romero, Jaime E., Fu, Shenming, Galbany, Lluís, Garavito-Camargo, Nicolas, Gawiser, Eric, Geha, Marla, Gnedin, Oleg Y., Gomez, Sebastian, Greene, Jenny, Guy, Julien, Hadzhiyska, Boryana, Hawkins, Keith, Heinrich, Chen, Hernquist, Lars, Hirata, Christopher, Hora, Joseph, Horowitz, Benjamin, Horta, Danny, Huang, Caroline, Huang, Xiaosheng, Huanyuan, Shan, Hunt, Jason A. S., Ibata, Rodrigo, Jannuzi, Buell, Johnston, Kathryn V., Jones, Michael G., Juneau, Stephanie, Kado-Fong, Erin, Kalari, Venu, Kallivayalil, Nitya, Karim, Tanveer, Keeley, Ryan, Khoperskov, Sergey, Kim, Bokyoung, Kovács, András, Krause, Elisabeth, Kremer, Kyle, Kremin, Anthony, Krolewski, Alex, Kulkarni, S. R., Kuna, Marine, L'Huillier, Benjamin, Lacy, Mark, Lan, Ting-Wen, Lang, Dustin, Leahy, Denis, Li, Jiaxuan, Lim, Seunghwan, López-Morales, Mercedes, Macri, Lucas, Marc, Manera, Mau, Sidney, McCarthy, Patrick J, McDonald, Eithne, McQuinn, Kristen, Meisner, Aaron, Melnick, Gary, Merloni, Andrea, Millard, Cléa, Millon, Martin, Minchev, Ivan, Montero-Camacho, Paulo, Morales-Gutierrez, Catalina, Morrell, Nidia, Moustakas, John, Moustakas, Leonidas, Murray, Zachary, Mutlu-Pakdil, Burcin, Myeong, GyuChul, Myers, Adam D., Nadler, Ethan, Navarete, Felipe, Ness, Melissa, Nidever, David L., Nikutta, Robert, Nushkia, Chamba, Olsen, Knut, Pace, Andrew B., Pacucci, Fabio, Padmanabhan, Nikhil, Parkinson, David, Pearson, Sarah, Peng, Eric W., Petric, Andreea O., Petric, Andreea, Ratcliffe, Bridget, Razieh, Emami, Reiprich, Thomas, Rezaie, Mehdi, Ricci, Marina, Rich, R. Michael, Richstein, Hannah, Riley, Alexander H., Rockosi, Constance, Rossi, Graziano, Salvato, Mara, Samushia, Lado, Sanchez, Javier, Sand, David J, Sanderson, Robyn E, Šarčević, Nikolina, Sarkar, Arnab, Savino, Alessandro, Schweizer, Francois, Shafieloo, Arman, Shengqi, Yang, Shields, Joseph, Shipp, Nora, Simon, Josh, Siudek, Malgorzata, Siwei, Zou, Slepian, Zachary, Smith, Verne, Sobeck, Jennifer, Sohn, Sangmo Tony, Som, Debopam, Speagle, Joshua S., Spergel, David, Szabo, Robert, Tan, Ting, Theissen, Christopher, Tollerud, Erik, Tolls, Volker, Tran, Kim-Vy, Tsiane, Kabelo, Vacca, William D., Valluri, Monica, Verberi, TonyLouis, Warfield, Jack, Weaverdyck, Noah, Weiner, Benjamin, Weisz, Daniel, Wetzel, Andrew, White, Martin, Williams, Christina C., Wolk, Scott, Wu, John F., Wyse, Rosemary, Yang, Justina R., Zaritsky, Dennis, Zelko, Ioana A., Zhimin, Zhou, Zucker, Catherine

مصطلحات موضوعية: Astrophysics - Instrumentation and Methods for Astrophysics

الوصف: The Nancy Grace Roman Space Telescope is capable of delivering an unprecedented all-sky, high-spatial resolution, multi-epoch infrared map to the astronomical community. This opportunity arises in the midst of numerous ground- and space-based surveys that will provide extensive spectroscopy and imaging together covering the entire sky (such as Rubin/LSST, Euclid, UNIONS, SPHEREx, DESI, SDSS-V, GALAH, 4MOST, WEAVE, MOONS, PFS, UVEX, NEO Surveyor, etc.). Roman can uniquely provide uniform high-spatial-resolution (~0.1 arcsec) imaging over the entire sky, vastly expanding the science reach and precision of all of these near-term and future surveys. This imaging will not only enhance other surveys, but also facilitate completely new science. By imaging the full sky over two epochs, Roman can measure the proper motions for stars across the entire Milky Way, probing 100 times fainter than Gaia out to the very edge of the Galaxy. Here, we propose NANCY: a completely public, all-sky survey that will create a high-value legacy dataset benefiting innumerable ongoing and forthcoming studies of the universe. NANCY is a pure expression of Roman's potential: it images the entire sky, at high spatial resolution, in a broad infrared bandpass that collects as many photons as possible. The majority of all ongoing astronomical surveys would benefit from incorporating observations of NANCY into their analyses, whether these surveys focus on nearby stars, the Milky Way, near-field cosmology, or the broader universe.
Comment: Submitted to the call for white papers for the Roman Core Community Survey (June 16th, 2023), and to the Bulletin of the AAS

الوصول الحر: http://arxiv.org/abs/2306.11784Test

المؤلفون: Velicheti, Phani Datta, Wu, John F., Petric, Andreea

المصدر: Publications of the Astronomical Society of the Pacific (2023) 135, 1050

مصطلحات موضوعية: Astrophysics - Instrumentation and Methods for Astrophysics

الوصف: The Nancy Grace Roman Space Telescope will survey a large area of the sky at near-infrared wavelengths with its Wide Field Instrument (WFI). The performance of the 18 WFI H4RG-10 detectors will need to be well-characterized and regularly monitored in order for Roman to meet its science objectives. Weak lensing science goals are particularly sensitive to instrumental distortions and patterns that might masquerade as astronomical signals. We apply the wavelet scattering transform in order to analyze localized signals in Roman WFI images that have been taken as part of a dark image test suite. The scattering transform quantifies shapes and clustering information by reducing images into non-linear combinations of wavelet modes on multiple size scales. We show that these interpretable scattering statistics can separate rare correlated patterns from typical noise signals, and we discuss the results in context of power spectrum analyses and other computer vision methods.
Comment: 14 pages, 4 figures, accepted to PASP

الوصول الحر: http://arxiv.org/abs/2308.02028Test

المؤلفون: Dey, Arjun, Najita, Joan, Filion, Carrie, Han, Jiwon Jesse, Pearson, Sarah, Wyse, Rosemary, Thob, Adrien C. R., Anguiano, Borja, Apfel, Miranda, Arnaboldi, Magda, Bell, Eric F., Silva, Leandro Beraldo e, Besla, Gurtina, Bhattacharya, Aparajito, Bhattacharya, Souradeep, Chandra, Vedant, Choi, Yumi, Collins, Michelle L. M., Cunningham, Emily C., Dalcanton, Julianne J., Escala, Ivanna, Foote, Hayden R., Ferguson, Annette M. N., Gibson, Benjamin J., Gnedin, Oleg Y., Guhathakurta, Puragra, Hawkins, Keith, Horta, Danny, Ibata, Rodrigo, Kallivayalil, Nitya, Koch, Eric W., Koposov, Sergey, Lewis, Geraint F., Macri, Lucas, McKinnon, Kevin A., Nidever, David L., Olsen, Knut A. G., Patel, Ekta, Petersen, Michael S., Petric, Andreea, Price-Whelan, Adrian M., Rich, R. Michael, Riley, Alexander H., Saha, Abhijit, Sanderson, Robyn E., Sharma, Sanjib, Sohn, Sangmo Tony, Soraisam, Monika D., Steinmetz, Matthias, Valluri, Monica, Vivas, A. Katherina, Williams, Benjamin F., Wojno, J. Leigh

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies

الوصف: As our nearest large neighbor, the Andromeda Galaxy provides a unique laboratory for investigating galaxy formation and the distribution and substructure properties of dark matter in a Milky Way-like galaxy. Here, we propose an initial 2-epoch ($\Delta t\approx 5$yr), 2-band Roman survey of the entire halo of Andromeda, covering 500 square degrees, which will detect nearly every red giant star in the halo (10$\sigma$ detection in F146, F062 of 26.5, 26.1AB mag respectively) and yield proper motions to $\sim$25 microarcsec/year (i.e., $\sim$90 km/s) for all stars brighter than F146 $\approx 23.6$ AB mag (i.e., reaching the red clump stars in the Andromeda halo). This survey will yield (through averaging) high-fidelity proper motions for all satellites and compact substructures in the Andromeda halo and will enable statistical searches for clusters in chemo-dynamical space. Adding a third epoch during the extended mission will improve these proper motions by $\sim t^{-1.5}$, to $\approx 11$ km/s, but this requires obtaining the first epoch in Year 1 of Roman operations. In combination with ongoing and imminent spectroscopic campaigns with ground-based telescopes, this Roman survey has the potential to yield full 3-d space motions of $>$100,000 stars in the Andromeda halo, including (by combining individual measurements) robust space motions of its entire globular cluster and most of its dwarf galaxy satellite populations. It will also identify high-velocity stars in Andromeda, providing unique information on the processes that create this population. These data offer a unique opportunity to study the immigration history, halo formation, and underlying dark matter scaffolding of a galaxy other than our own.
Comment: Submitted in response to the call for Roman Space Telescope Core Community Survey white papers

الوصول الحر: http://arxiv.org/abs/2306.12302Test

المؤلفون: Kamieneski, Patrick S., Frye, Brenda L., Pascale, Massimo, Cohen, Seth H., Windhorst, Rogier A., Jansen, Rolf A., Yun, Min S., Cheng, Cheng, Summers, Jake S., Carleton, Timothy, Harrington, Kevin C., Diego, Jose M., Yan, Haojing, Koekemoer, Anton M., Willmer, Christopher N. A., Petric, Andreea, Furtak, Lukas J., Foo, Nicholas, Conselice, Christopher J., Coe, Dan, Driver, Simon P., Grogin, Norman A., Marshall, Madeline A., Pirzkal, Nor, Robotham, Aaron S. G., Ryan Jr., Russell E., Tompkins, Scott

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies

الوصف: Gradients in the mass-to-light ratio of distant galaxies impede our ability to characterize their size and compactness. The long-wavelength filters of $JWST$'s NIRCam offer a significant step forward. For galaxies at Cosmic Noon ($z\sim2$), this regime corresponds to the rest-frame near-infrared, which is less biased towards young stars and captures emission from the bulk of a galaxy's stellar population. We present an initial analysis of an extraordinary lensed dusty star-forming galaxy (DSFG) at $z=2.3$ behind the $El~Gordo$ cluster ($z=0.87$), named $El~Anzuelo$ ("The Fishhook") after its partial Einstein-ring morphology. The FUV-NIR SED suggests an intrinsic star formation rate of $81^{+7}_{-2}~M_\odot~{\rm yr}^{-1}$ and dust attenuation $A_V\approx 1.6$, in line with other DSFGs on the star-forming main sequence. We develop a parametric lens model to reconstruct the source-plane structure of dust imaged by the Atacama Large Millimeter/submillimeter Array, far-UV to optical light from $Hubble$, and near-IR imaging with 8 filters of $JWST$/NIRCam, as part of the Prime Extragalactic Areas for Reionization and Lensing Science (PEARLS) program. The source-plane half-light radius is remarkably consistent from $\sim 1-4.5~\mu$m, despite a clear color gradient where the inferred galaxy center is redder than the outskirts. We interpret this to be the result of both a radially-decreasing gradient in attenuation and substantial spatial offsets between UV- and IR-emitting components. A spatial decomposition of the SED reveals modestly suppressed star formation in the inner kiloparsec, which suggests that we are witnessing the early stages of inside-out quenching.
Comment: 29 pages, 11 figures, 5 tables. Accepted for publication in ApJ

الوصول الحر: http://arxiv.org/abs/2303.05054Test

المؤلفون: Otter, Justin Atsushi, Rowlands, Kate, Alatalo, Katherine, Leung, Ho-Hin, Wild, Vivienne, Luo, Yuanze, Petric, Andreea O., Sazonova, Elizaveta, Stark, David V., Heckman, Timothy, Davis, Timothy A., Ellison, Sara, French, K. Decker, Baker, William, Bluck, Asa F. L., Lanz, Lauranne, Lin, Lihwai, Liu, Charles, Cobá, Carlos López, Masters, Karen L., Nair, Preethi, Pan, Hsi-an, Riffel, Rogemar A., Scudder, Jillian M., Smercina, Adam, van de Voort, Freeke, Weaver, John R.

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies

الوصف: Post-starburst galaxies (PSBs) have recently and rapidly quenched their star-formation, thus they are an important way to understand how galaxies transition from star-forming late-types to quiescent early-types. The recent discovery of large cold gas reservoirs in PSBs calls into question the theory that galaxies must lose their gas to become quiescent. Optical Integral Field Spectroscopy (IFS) surveys have revealed two classes of PSBs: central PSBs with central quenching regions and ring PSBs with quenching in their outskirts. We analyze a sample of 13 nearby (z < 0.1) PSBs with spatially resolved optical IFS data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey and matched resolution Atacama Large (sub-)Millimeter Array (ALMA) observations of $^{12}$CO(1-0). Disturbed stellar kinematics in 7/13 of our PSBs and centrally concentrated molecular gas is consistent with a recent merger for most of our sample. In galaxies without merger evidence, alternate processes may funnel gas inwards and suppress star-formation, which may include outflows, stellar bars, and minor mergers or interactions. The star-formation efficiencies of the post-starburst regions in nearly half our galaxies are suppressed while the gas fractions are consistent with star-forming galaxies. AGN feedback may drive this stabilization, and we observe AGN-consistent emission in the centers of 5/13 galaxies. Finally, our central and ring PSBs have similar properties except the ionized and molecular gas in central PSBs is more disturbed. Overall, the molecular gas in our PSBs tends to be compact and highly disturbed, resulting in concentrated gas reservoirs unable to form stars efficiently.
Comment: Accepted for publication in The Astrophysical Journal

الوصول الحر: http://arxiv.org/abs/2210.12199Test

المؤلفون: Beaulieu, Damien, Petric, Andreea, Robert, Carmelle, Alatalo, Katherine, Heckman, Timothy, Merhi, Maya, Rousseau-Nepton, Laurie, Rowlands, Kate

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies

الوصف: We present star formation rates based on cold and ionized gas measurements of Mrk 266 (NGC 5256), a system composed of two colliding gas-rich galaxies, each hosting an active galactic nucleus. Using $^{12}$CO (1-0) observations with the Combined Array for Research in Millimeter-Wave Astronomy (CARMA), we find a total H$_2$ mass in the central region of $1.1\pm0.3\times10^{10}$ $M_\odot$ which leads to a possible future star formation rate of $25\pm10 M_\odot$ yr$^{-1}$. With the Fourier Transform Spectrograph (SITELLE) on the Canada-France-Hawaii Telescope, we measure an integrated H$\alpha$ luminosity and estimate a present-day star formation rate of $15\pm2 M_\odot$ yr$^{-1}$ in the core of the system (avoiding the two active nuclei). These results confirm that Mrk 266 is an intermediate stage merger with a relatively high recent star formation rate and enough molecular gas to sustain it for a few hundred million years. Inflowing gas associated with the merger may have triggered both the starburst episode and two AGN but the two galaxy components differ: the region around the SW nucleus appears to be more active than the NE nucleus, which seems relatively quiet. We speculate that this difference may originate in the properties of the interstellar medium in the two systems.
Comment: 11 pages, 7 figures, 1 table, accepted for publication in Monthly Notices of the Royal Astronomical Society (MNRAS)

الوصول الحر: http://arxiv.org/abs/2210.10853Test

المؤلفون: Cheng, Cheng, Huang, Jia-Sheng, Smail, Ian, Yan, Haojing, Cohen, Seth H., Jansen, Rolf A., Windhorst, Rogier A., Ma, Zhiyuan, Koekemoer, Anton, Willmer, Christopher N. A., Willner, S. P., Diego, Jose M., Frye, Brenda, Conselice, Christopher J., Ferreira, Leonardo, Petric, Andreea, Yun, Min, Gim, Hansung B., Polletta, Maria del Carmen, Duncan, Kenneth J., Honor, Rachel, Holwerda, Benne W., Röttgering, Huub J. A., Hathi, Nimish P., Kamieneski, Patrick S., Adams, Nathan J., Coe, Dan, Broadhurst, Tom, Summers, Jake, Tompkins, Scott, Driver, Simon P., Grogin, Norman A., Marshall, Madeline A., Pirzkal, Nor, Robotham, Aaron, Ryan Jr, Russell E.

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies

الوصف: We report the results of James Webb Space Telescope/NIRCam observations of 19 (sub)millimeter (submm/mm) sources detected by the Atacama Large Millimeter Array (ALMA). The accurate ALMA positions allowed unambiguous identifications of their NIRCam counterparts. Taking gravitational lensing into account, these represent 16 distinct galaxies in three fields and constitute the largest sample of its kind to date. The counterparts' spectral energy distributions from rest-frame ultraviolet to near infrared provide photometric redshifts ($110^{10.5}$ Msol), which are similar to sub-millimeter galaxy (SMG) hosts studied previously. However, our sample is fainter in submm/mm than the classic SMG samples are, and our sources exhibit a wider range of properties. They have dust-embedded star-formation rates as low as 10 Msol yr$^{-1}$, and the sources populate both the star-forming main sequence and the quiescent categories. The deep NIRCam data allow us to study the rest-frame near-IR morphologies. Excluding two multiply imaged systems and one quasar, the majority of the remaining sources are disk-like and show either little or no disturbance. This suggests that secular growth is a potential route for the assembly of high-mass disk galaxies. While a few hosts have large disks, the majority have small disks (median half-mass radius of 1.6 kpc). At this time, it is unclear whether this is due to the prevalence of small disks at these redshifts or some unknown selection effects of deep ALMA observations. A larger sample of ALMA sources with NIRCam observations will be able to address this question.
Comment: 19 pages, 11 figures, accepted by ApJL

الوصول الحر: http://arxiv.org/abs/2210.08163Test

المؤلفون: Windhorst, Rogier A., Cohen, Seth H., Jansen, Rolf A., Summers, Jake, Tompkins, Scott, Conselice, Christopher J., Driver, Simon P., Yan, Haojing, Coe, Dan, Frye, Brenda, Grogin, Norman, Koekemoer, Anton, Marshall, Madeline A., O'Brien, Rosalia, Pirzkal, Nor, Robotham, Aaron, Ryan, Jr., Russell E., Willmer, Christopher N. A., Carleton, Timothy, Diego, Jose M., Keel, William C., Porto, Paolo, Redshaw, Caleb, Scheller, Sydney, Wilkins, Stephen M., Willner, S. P., Zitrin, Adi, Adams, Nathan J., Austin, Duncan, Arendt, Richard G., Beacom, John F., Bhatawdekar, Rachana A., Bradley, Larry D., Broadhurst, Thomas J., Cheng, Cheng, Civano, Francesca, Dai, Liang, Dole, Herve, D'Silva, Jordan C. J., Duncan, Kenneth J., Fazio, Giovanni G., Ferrami, Giovanni, Ferreira, Leonardo, Finkelstein, Steven L., Furtak, Lukas J., Gim, Hansung B., Griffiths, Alex, Hammel, Heidi B., Harrington, Kevin C., Hathi, Nimish P., Holwerda, Benne W., Honor, Rachel, Huang, Jia-Sheng, Hyun, Minhee, Im, Myungshin, Joshi, Bhavin A., Kamieneski, Patrick S., Kelly, Patrick, Larson, Rebecca L., Li, Juno, Lim, Jeremy, Ma, Zhiyuan, Maksym, Peter, Manzoni, Giorgio, Meena, Ashish Kumar, Milam, Stefanie N., Nonino, Mario, Pascale, Massimo, Pierel, Justin D. R., Petric, Andreea, Polletta, Maria del Carmen, Rottgering, Huub J. A., Rutkowski, Michael J., Smail, Ian, Straughn, Amber N., Strolger, Louis-Gregory, Swirbul, Andi, Trussler, James A. A., Wang, Lifan, Welch, Brian, Wyithe, J. Stuart B., Yun, Min, Zackrisson, Erik, Zhang, Jiashuo, Zhao, Xiurui

مصطلحات موضوعية: Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies

الوصف: We give an overview and describe the rationale, methods, and first results from NIRCam images of the JWST "Prime Extragalactic Areas for Reionization and Lensing Science" ("PEARLS") project. PEARLS uses up to eight NIRCam filters to survey several prime extragalactic survey areas: two fields at the North Ecliptic Pole (NEP); seven gravitationally lensing clusters; two high redshift proto-clusters; and the iconic backlit VV 191 galaxy system to map its dust attenuation. PEARLS also includes NIRISS spectra for one of the NEP fields and NIRSpec spectra of two high-redshift quasars. The main goal of PEARLS is to study the epoch of galaxy assembly, AGN growth, and First Light. Five fields, the JWST NEP Time-Domain Field (TDF), IRAC Dark Field (IDF), and three lensing clusters, will be observed in up to four epochs over a year. The cadence and sensitivity of the imaging data are ideally suited to find faint variable objects such as weak AGN, high-redshift supernovae, and cluster caustic transits. Both NEP fields have sightlines through our Galaxy, providing significant numbers of very faint brown dwarfs whose proper motions can be studied. Observations from the first spoke in the NEP TDF are public. This paper presents our first PEARLS observations, their NIRCam data reduction and analysis, our first object catalogs, the 0.9-4.5 $\mu$m galaxy counts and Integrated Galaxy Light. We assess the JWST sky brightness in 13 NIRCam filters, yielding our first constraints to diffuse light at 0.9-4.5 {\mu}m. PEARLS is designed to be of lasting benefit to the community.
Comment: Accepted to AJ, comments welcome. We ask anyone who uses our public PEARLS (NEP TDF) data to refer to this overview paper

الوصول الحر: http://arxiv.org/abs/2209.04119Test

المؤلفون: Keel, William C., Windhorst, Rogier A., Jansen, Rolf A., Cohen, Seth H., Summers, Jake, Holwerda, Benne, Bradford, Sarah T., Robertson, Clayton D., Ferrami, Giovanni, Wyithe, Stuart, Yan, Haojing, Conselice, Christopher J., Driver, Simon P., Robotham, Aaron, Grogin, Norman A., Willmer, Christopher N. A., Koekemoer, Anton M., Frye, Brenda L., Hathi, Nimish P., Ryan, Jr., Russell E., Pirzkal, Nor, Marshall, Madeline A., Coe, Dan, Diego, Jose M., Broadhurst, Thomas J., Rutkowski, Michael J., Wang, Lifan, Willner, S. P., Petric, Andreea, Cheng, Cheng, Zitrin, Adi

مصطلحات موضوعية: Astrophysics - Astrophysics of Galaxies

الوصف: We derive the spatial and wavelength behavior of dust attenuation in the multiple-armed spiral galaxy VV191b using backlighting by the superimposed elliptical system VV191a in a pair with an exceptionally favorable geometry for this measurement. Imaging using JWST and HST spans the wavelength range 0.3-4.5 microns with high angular resolution, tracing the dust in detail from 0.6 to 1.5 microns. Distinct dust lanes continue well beyond the bright spiral arms, and trace a complex web, with a very sharp radial cutoff near 1.7 Petrosian radii. We present attenuation profiles and coverage statistics in each band at radii 14-21 kpc. We derive the attenuation law with wavelength; the data both within and between the dust lanes clearly favor a stronger reddening behavior (R ~ 2.0 between 0.6 and 0.9 microns, approaching unity by 1.5 microns) than found for starbursts and star-forming regions of galaxies. Power-law extinction behavior lambda^(-beta) gives beta=2.1 from 0.6-0.9 microns. R decreases at increasing wavelengths (R~1.1 between 0.9 and 1.5 microns), while beta steepens to 2.5. Mixing regions of different column density flattens the wavelength behavior, so these results suggest a different grain population than in our vicinity. The NIRCam images reveal a lens arc and counterimage from a background galaxy at z~1, spanning 90 degrees azimuthally at 2.8" from the foreground elliptical galaxy nucleus, and an additional weakly-lensed galaxy. The lens model and imaging data give a mass/light ratio 7.6 in solar units within the Einstein radius 2.0 kpc.
Comment: Accepted by Astron. J. Analysis redone since submission, using updated JWST calibrations. Dust reddening behavior is steeper with wavelength and lensed galaxy redshift lower than we first derived

الوصول الحر: http://arxiv.org/abs/2208.14475Test