期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 470, 期 1, 页码 283-302出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1149
关键词
galaxies: evolution; galaxies: fundamental parameters; galaxies: general; galaxies: luminosity function, mass function; galaxies: stellar content
资金
- STFC (UK)
- ARC (Australia)
- AAO
- European Research Council Advanced Investigator Grant COSMICISM [321302]
- European Research Council Consolidator Grant COSMICDUST [ERC-2014-CoG-647939]
- ESO Telescopes at the La Silla Paranal Observatory [179.A-2004]
- STFC [ST/J001465/1, ST/L000652/1, ST/H002391/1, PP/E001149/1, ST/L00061X/1, ST/F007159/1, ST/P000541/1, ST/M000907/1, ST/I000976/1, ST/M003574/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/M000907/1, ST/M000966/1, ST/H002391/1, ST/M003574/1, ST/P000541/1, ST/J001465/1, ST/I000976/1, ST/L00061X/1, ST/F007159/1, ST/L000652/1, PP/E001149/1] Funding Source: researchfish
We derive the low-redshift galaxy stellar mass function (GSMF), inclusive of dust corrections, for the equatorial Galaxy And Mass Assembly (GAMA) data set covering 180 deg(2). We construct the mass function using a density-corrected maximum volume method, using masses corrected for the impact of optically thick and thin dust. We explore the galactic bivariate brightness plane (M-star -mu), demonstrating that surface brightness effects do not systematically bias our mass function measurement above 10(7.5) M-circle dot. The galaxy distribution in the M-mu plane appears well bounded, indicating that no substantial population of massive but diffuse or highly compact galaxies are systematically missed due to the GAMA selection criteria. The GSMF is fitted with a double Schechter function, with M-star= 10(10.78 +/- 0.01 +/- 0.20) M circle dot, phi(star)(1) = (2.93 +/- 0.40) x 10(-3) h(70) (3)Mpc(-3), alpha(1) = -0.62 +/- 0.03 +/- 0.15, phi(star)(2) = (0.63 +/- 0.10) x 10(-3) h(70) (3) Mpc(-3) and alpha(2) = -1.50 +/- 0.01 +/- 0.15. We find the equivalent faint end slope as previously estimated using the GAMA-I sample, although we find a higher value of M-star. Using the full GAMA-II sample, we are able to fit the mass function to masses as low as 10(7.5)M (circle dot), and assess limits to 10(6.5) M-circle dot. Combining GAMA-II with data from G10-COSMOS, we are able to comment qualitatively on the shape of the GSMF down to masses as low as 10(6)M(circle dot). Beyond the well-known upturn seen in the GSMF at 10(9.5), the distribution appears to maintain a single power-law slope from 10(9) to 10(6.5). We calculate the stellar mass density parameter given our best-estimate GSMF, finding Omega(star) = 1.66(-0.23)(+0.24) +/- 0.97 h(70)(-1) x 10(-3), inclusive of random and systematic uncertainties.
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