Herschel★-ATLAS: rapid evolution of dust in galaxies over the last 5 billion years
| Autor: | P. van der Werf, David Bonfield, C. Vlahakis, D. J. B. Smith, G. Rodighiero, Pasquale Temi, Simon Dye, Simon P. Driver, Robbie Richard Auld, G. de Zotti, Steve Serjeant, N. Bourne, S. Buttiglione, Matt J. Jarvis, Maarten Baes, A. Dariush, Loretta Dunne, Jacopo Fritz, M. Pohlen, Asantha Cooray, Maggie A. Thompson, Aaron S. G. Robotham, S. J. Maddox, Antonio Cava, Enzo Pascale, James E. Geach, E. E. Rigby, H. L. Gomez, Rob Ivison, L. Kelvin, Stéphane Charlot, D. L. Clements, Cristina Popescu, R. Hopwood, E. da Cunha, E. Ibar, Anne E. Sansom, K. Coppin, Kate Rowlands, Steve Eales, R. J. Tuffs |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Star formation media_common.quotation_subject Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Mass ratio Billion years Galaxy Redshift Universe Space and Planetary Science Optical depth (astrophysics) Astrophysics::Solar and Stellar Astrophysics Spectral energy distribution Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 417:1510-1533 |
| ISSN: | 0035-8711 |
| Popis: | We present the first direct and unbiased measurement of the evolution of the dust mass function of galaxies over the past 5 billion years of cosmic history using data from the Science Demonstration Phase of the Herschel-ATLAS. The sample consists of galaxies selected at 250{\mu}m which have reliable counterparts from SDSS at z < 0.5, and contains 1867 sources. Dust masses are calculated using both a single temperature grey-body model for the spectral energy distribution and also using a model with multiple temperature components. The dust temperature for either model shows no trend with redshift. Splitting the sample into bins of redshift reveals a strong evolution in the dust properties of the most massive galaxies. At z = 0.4 - 0.5, massive galaxies had dust masses about five times larger than in the local Universe. At the same time, the dust-to-stellar mass ratio was about 3-4 times larger, and the optical depth derived from fitting the UV-sub-mm data with an energy balance model was also higher. This increase in the dust content of massive galaxies at high redshift is difficult to explain using standard dust evolution models and requires a rapid gas consumption timescale together with either a more top-heavy IMF, efficient mantle growth, less dust destruction or combinations of all three. This evolution in dust mass is likely to be associated with a change in overall ISM mass, and points to an enhanced supply of fuel for star formation at earlier cosmic epochs. |
| Databáze: | OpenAIRE |
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