Satellites Around Milky Way Analogs: Tension in the Number and Fraction of Quiescent Satellites Seen in Observations Versus Simulations
| العنوان: | Satellites Around Milky Way Analogs: Tension in the Number and Fraction of Quiescent Satellites Seen in Observations Versus Simulations |
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| المؤلفون: | Burçin Mutlu-Pakdil, Azadeh Fattahi, Kristine Spekkens, Facundo A. Gómez, Christine M. Simpson, Denija Crnojević, Ananthan Karunakaran, Carlos S. Frenk, Federico Marinacci, Julio F. Navarro, Paul Bennet, Robert J. J. Grand, Michael G. Jones, Dennis Zaritsky, Kyle A. Oman, David J. Sand |
| المساهمون: | Karunakaran A., Spekkens K., Oman K.A., Simpson C.M., Fattahi A., Sand D.J., Bennet P., Crnojevic D., Frenk C.S., Gomez F.A., Grand R.J.J., Jones M.G., Marinacci F., Mutlu-Pakdil B., Navarro J.F., Zaritsky D. |
| المصدر: | The Astrophysical Journal Letters, 2021, Vol.916(2), pp.L19 [Peer Reviewed Journal] |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, Stellar mass, AURIGA, 010308 nuclear & particles physics, Star formation, Milky Way, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Stage ii, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Quenched galaxie, Dwarf galaxie, Space and Planetary Science, Galaxy quenching, Astrophysics of Galaxies (astro-ph.GA), Tension (geology), Galaxy evolution, 0103 physical sciences, Satellite, Detection rate, 010303 astronomy & astrophysics |
| الوصف: | We compare the star-forming properties of satellites around Milky Way (MW) analogs from the Stage~II release of the Satellites Around Galactic Analogs Survey (SAGA-II) to those from the APOSTLE and Auriga cosmological zoom-in simulation suites. We use archival GALEX UV imaging as a star-formation indicator for the SAGA-II sample and derive star-formation rates (SFRs) to compare with those from APOSTLE and Auriga. We compare our detection rates from the NUV and FUV bands to the SAGA-II H$\alpha$ detections and find that they are broadly consistent with over $85\%$ of observed satellites detected in all three tracers. We apply the same spatial selection criteria used around SAGA-II hosts to select satellites around the MW-like hosts in APOSTLE and Auriga. We find very good overall agreement in the derived SFRs for the star-forming satellites as well as the number of star-forming satellites per host in observed and simulated samples. However, the number and fraction of quenched satellites in the SAGA-II sample are significantly lower than those in APOSTLE and Auriga below a stellar mass of $M_*\sim10^{8}\,M_{\odot}$, even when the SAGA-II incompleteness and interloper corrections are included. This discrepancy is robust with respect to the resolution of the simulations and persists when alternative star-formation tracers are employed. We posit that this disagreement is not readily explained by vagaries in the observed or simulated samples considered here, suggesting a genuine discrepancy that may inform the physics of satellite populations around MW analogs. Comment: Accepted for publication in ApJ Letters after minor changes to text |
| وصف الملف: | STAMPA; application/pdf |
| اللغة: | English |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::604350edae1ad7808bb6d495db2a82f3Test http://arxiv.org/abs/2105.09321Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....604350edae1ad7808bb6d495db2a82f3 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |