The SAMI Galaxy Survey: Spatially Resolving the Main Sequence of Star Formation
| Autor: | Michael J. Drinkwater, Joss Bland-Hawthorn, Sarah M. Sweet, A. H. Wright, Jesse van de Sande, Andrew W. Green, Warrick J. Couch, Gerald Cecil, Kenji Bekki, Julia J. Bryant, Matthew Colless, Matt S. Owers, Edoardo Tescari, Christoph Federrath, Brent Groves, Gregory Goldstein, Barbara Catinella, Geraint F. Lewis, Scott M. Croom, Samuel N. Richards, Nicholas Scott, I-Ting Ho, Adam L. Schaefer, Sarah Brough, Richard M. McDermid, Simon P. Driver, Anne M. Medling, Elise Hampton, Dan S. Taranu, Michael Goodwin, Rob Sharp, Amanda J. Moffett, Jon Lawrence, C. Jakob Walcher, Caroline Foster, Andrew M. Hopkins, J. V. Bloom, Sarah K. Leslie, Luke J. M. Davies, Nuria P. F. Lorente, Tayyaba Zafar, C. Tonini, Lisa J. Kewley, Edward N. Taylor, Luca Cortese |
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| Přispěvatelé: | University of St Andrews. School of Physics and Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Active galactic nucleus
Stellar mass Population FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Surveys 01 natural sciences star formation [Galaxies] symbols.namesake 0103 physical sciences QB Astronomy Astrophysics::Solar and Stellar Astrophysics education 010303 astronomy & astrophysics QC Astrophysics::Galaxy Astrophysics QB Physics education.field_of_study Spiral galaxy 010308 nuclear & particles physics Star formation Balmer series Astronomy and Astrophysics DAS evolution [Galaxies] Astrophysics - Astrophysics of Galaxies Galaxy Stars QC Physics 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) symbols Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society NASA Astrophysics Data System |
| Popis: | We present the ~800 star formation rate maps for the SAMI Galaxy Survey based on H{\alpha} emission maps, corrected for dust attenuation via the Balmer decrement, that are included in the SAMI Public Data Release 1. We mask out spaxels contaminated by non-stellar emission using the [O III]/H{\beta}, [N II]/H{\alpha}, [S II]/H{\alpha}, and [O I]/H{\alpha} line ratios. Using these maps, we examine the global and resolved star-forming main sequences of SAMI galaxies as a function of morphology, environmental density, and stellar mass. Galaxies further below the star-forming main sequence are more likely to have flatter star formation profiles. Early-type galaxies split into two populations with similar stellar masses and central stellar mass surface densities. The main sequence population has centrally-concentrated star formation similar to late-type galaxies, while galaxies >3{\sigma} below the main sequence show significantly reduced star formation most strikingly in the nuclear regions. The split populations support a two-step quenching mechanism, wherein halo mass first cuts off the gas supply and remaining gas continues to form stars until the local stellar mass surface density can stabilize the reduced remaining fuel against further star formation. Across all morphologies, galaxies in denser environments show a decreased specific star formation rate from the outside in, supporting an environmental cause for quenching, such as ram-pressure stripping or galaxy interactions. Comment: accepted to MNRAS |
| Databáze: | OpenAIRE |
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