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Galaxy And Mass Assembly (GAMA): the galaxy stellar mass function to z = 0.1 from the r-band selected equatorial regions
journal contribution
posted on 2023-06-09, 13:35 authored by A H Wright, A S G Robotham, S P Driver, M Alpaslan, S K Andrews, I K Baldry, J Bland-Hawthorn, S Brought, M J I Brown, M Colless, E da Cunha, L J M Davies, Alister W Graham, B W Holwerda, A M Hopkins, P R Kafle, L S Kelvin, Jonathan LovedayJonathan Loveday, S J Maddox, M J Meyer, A J Moffett, P Norberg, S Phillipps, K Rowlands, E N Taylor, L Wang, Stephen WilkinsStephen WilkinsWe 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 deg2. 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?–µ), demonstrating that surface brightness effects do not systematically bias our mass function measurement above 107.5 M?. The galaxy distribution in the M–µ 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*=1010.78±0.01±0.20M?, ??1=(2.93±0.40)×10-3h370 Mpc-3, a1 = -0.62 ± 0.03 ± 0.15, ??2=(0.63±0.10)×10-3h370 Mpc-3 and a2 = -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*. Using the full GAMA-II sample, we are able to fit the mass function to masses as low as 107.5 ?M?, and assess limits to 106.5 ?M?. 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 106?M?. Beyond the well-known upturn seen in the GSMF at 109.5, the distribution appears to maintain a single power-law slope from 109 to 106.5. We calculate the stellar mass density parameter given our best-estimate GSMF, finding O?=1.66+0.24-0.23±0.97h-170×10-3, inclusive of random and systematic uncertainties.
Funding
University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
1Volume
470Page range
283-302Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-05-30First Open Access (FOA) Date
2018-05-30First Compliant Deposit (FCD) Date
2018-05-30Usage metrics
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