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1دورية أكاديمية
المؤلفون: Castignani, G., Combes, F., Salome, P., Andreon, S., Pannella, M., Heywood, I., Trinchieri, G., Cicone, C., Davies, L. J. M., Owen, F. N., Raichoor, A.
المصدر: Astronomy & Astrophysics
الوصف: Context. Probing both star formation history and evolution of distant cluster galaxies is essential to evaluate the effect of dense environment on shaping the galaxy properties we observe today. Aims. We investigate the effect of cluster environment on the processing of the molecular gas in distant cluster galaxies. We study the molecular gas properties of two star-forming galaxies separated by 6 kpc in the projected space and belonging to a galaxy cluster selected from the frac Shallow Cluster Survey, at a redshift z = 1.2, that is,similar to 2 Gyr after the cosmic star formation density peak. This work describes the first CO detection from 1 < z < 1.4 star-forming cluster galaxies with no clear reported evidence of active galactic nuclei. Methods. We exploit observations taken with the NOEMA interferometer at similar to 3 mm to detect CO(2-1) line emission from the two selected galaxies, unresolved by our observations. Results. Based on the CO(2-1) spectrum, we estimate a total molecular gas mass M(H-2) = (2.2(-0.4)(+0.5)) x 10(10) M-circle dot, where fully excited gas is assumed, and a dust mass M-dust < 4.2 x 10(8) M(circle dot )for the two blended sources. The two galaxies have similar stellar masses and H alpha-based star formation rates (SFRs) found in previous work, as well as a large relative velocity of similar to 400 km s(-1) estimated from the CO(2-1) line width. These findings tend to privilege a scenario where both sources contribute to the observed CO(2-1). Using the archival Spitzer MIPS flux at 24 mu m we estimate an SFR (24 mu m) = (24(-8)(+12)) M-circle dot/yr for each of the two galaxies. Assuming that the two sources contribute equally to the observed CO(2-1), our analysis yields a depletion timescale of tau(dep) = (3.9(-1.8)(+1.4)) x 10(8) yr, and a molecular gas to stellar mass ratio of 0.17 +/- 0.13 for each of two sources, separately. We also provide a new, more precise measurement of an unknown weighted mean of the redshifts of the two galaxies, z = 1.163 +/- 0.001. ...
وصف الملف: application/pdf
العلاقة: Castignani, G.; Combes, F.; Salome, P.; Andreon, S.; Pannella, M.; Heywood, I.; Trinchieri, G.; Cicone, C.; Davies, L. J. M.; Owen, F. N.; Raichoor, A. (2018): Molecular gas in two companion cluster galaxies at z=1.2. In: Astronomy & Astrophysics, Vol. 617, A103 [PDF, 3MB]; https://epub.ub.uni-muenchen.de/66722/1/aa32887-18.pdfTest; http://nbn-resolving.de/urn:nbn:de:bvb:19-epub-66722-0Test; https://epub.ub.uni-muenchen.de/66722Test/
الإتاحة: https://doi.org/10.1051/0004-6361/201832887Test
https://epub.ub.uni-muenchen.de/66722/1/aa32887-18.pdfTest
https://epub.ub.uni-muenchen.de/66722Test/
http://nbn-resolving.de/urn:nbn:de:bvb:19-epub-66722-0Test -
2دورية أكاديمية
المؤلفون: Boselli, A., Fossati, M., Ferrarese, L., Boissier, S., Consolandi, G., Longobardi, A., Amram, P., Balogh, M., Barmby, P., Boquien, M., Boulanger, F., Braine, J., Buat, V., Burgarella, D., Combes, F., Contini, T., Cortese, L., Cote, P., Cote, S., Cuillandre, J. C., Drissen, L., Epinat, B., Fumagalli, M., Gallagher, S., Gavazzi, G., Gomez-Lopez, J., Gwyn, S., Harris, W., Hensler, G., Koribalski, B., Marceline, M., McConnachie, A., Miville-Deschenes, M. A., Navarro, J., Patton, D., Peng, E. W., Plana, H., Prantzos, N., Robert, C., Roediger, J., Roehlly, Y., Russeil, D., Salome, P., Sanchez-Janssen, R., Serra, P., Spekkens, K., Sun, M., Taylor, J., Tonnesen, S., Vollmer, B., Willis, J., Wozniak, H., Burdullis, T., Devost, D., Mahoney, B., Manset, N., Petric, A., Prunet, S., Withington, K.
المصدر: Astronomy & Astrophysics
الوصف: The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band (NB) H alpha+[NII] imaging survey carried out with MegaCam at the Canada-France-Hawaii Telescope. The survey covers the whole Virgo cluster region from its core to one virial radius (104 deg(2)). The sensitivity of the survey is of f (H alpha) similar to 4 x 10(-17) erg s(-1) cm(-2) (5 sigma detection limit) for point sources and Sigma(H alpha) similar to 2 x 10(-18) erg s(-1) cm(-2) arcsec(-2) (1 sigma detection limit at 3 arcsec resolution) for extended sources, making VESTIGE the deepest and largest blind NB survey of a nearby cluster. This paper presents the survey in all its technical aspects, including the survey design, the observing strategy, the achieved sensitivity in both the NB H alpha +[NII] and in the broad-band r filter used for the stellar continuum subtraction, the data reduction, calibration, and products, as well as its status after the first observing semester. We briefly describe the H alpha properties of galaxies located in a 4 x 1 deg(2) strip in the core of the cluster north of M87, where several extended tails of ionised gas are detected. This paper also lists the main scientific motivations for VESTIGE, which include the study of the effects of the environment on galaxy evolution, the fate of the stripped gas in cluster objects, the star formation process in nearby galaxies of different type and stellar mass, the determination of the H alpha luminosity function and of the H alpha scaling relations down to similar to 10(6) M-circle dot stellar mass objects, and the reconstruction of the dynamical structure of the Virgo cluster. This unique set of data will also be used to study the HII luminosity function in hundreds of galaxies, the diffuse H alpha +[NII] emission of the Milky Way at high Galactic latitude, and the properties of emission line galaxies at high redshift.
وصف الملف: application/pdf
العلاقة: Boselli, A.; Fossati, M.; Ferrarese, L.; Boissier, S.; Consolandi, G.; Longobardi, A.; Amram, P.; Balogh, M.; Barmby, P.; Boquien, M.; Boulanger, F.; Braine, J.; Buat, V.; Burgarella, D.; Combes, F.; Contini, T.; Cortese, L.; Cote, P.; Cote, S.; Cuillandre, J. C.; Drissen, L.; Epinat, B.; Fumagalli, M.; Gallagher, S.; Gavazzi, G.; Gomez-Lopez, J.; Gwyn, S.; Harris, W.; Hensler, G.; Koribalski, B.; Marceline, M.; McConnachie, A.; Miville-Deschenes, M. A.; Navarro, J.; Patton, D.; Peng, E. W.; Plana, H.; Prantzos, N.; Robert, C.; Roediger, J.; Roehlly, Y.; Russeil, D.; Salome, P.; Sanchez-Janssen, R.; Serra, P.; Spekkens, K.; Sun, M.; Taylor, J.; Tonnesen, S.; Vollmer, B.; Willis, J.; Wozniak, H.; Burdullis, T.; Devost, D.; Mahoney, B.; Manset, N.; Petric, A.; Prunet, S.; Withington, K. (2018): A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). In: Astronomy & Astrophysics, Vol. 614, A56 [PDF, 6MB]; https://epub.ub.uni-muenchen.de/66635/1/aa32407-17.pdfTest; http://nbn-resolving.de/urn:nbn:de:bvb:19-epub-66635-7Test; https://epub.ub.uni-muenchen.de/66635Test/
الإتاحة: https://doi.org/10.1051/0004-6361/201732407Test
https://epub.ub.uni-muenchen.de/66635/1/aa32407-17.pdfTest
https://epub.ub.uni-muenchen.de/66635Test/
http://nbn-resolving.de/urn:nbn:de:bvb:19-epub-66635-7Test
