J/ApJ/909/74 The Dragonfly Wide Field Survey. II. Massive gal. (Miller+, 2021) ================================================================================ The Dragonfly Wide Field Survey. II. Accurate total luminosities and colors of nearby massive galaxies and implications for the galaxy stellar-mass function. Miller T.B., van Dokkum P., Danieli S., Li J., Abraham R., Conroy C., Gilhuly C., Greco J.P., Liu Q., Lokhorst D., Merritt A. =2021ApJ...909...74M ================================================================================ ADC_Keywords: Galaxies, photometry; Photometry, SDSS; Colors; Surveys Keywords: Galaxy photometry ; Galaxy luminosities ; Galaxy colors ; Galaxy counts Abstract: Stellar-mass estimates of massive galaxies are susceptible to systematic errors in their photometry, due to their extended light profiles. In this study, we use data from the Dragonfly Wide Field Survey to accurately measure the total luminosities and colors of nearby massive galaxies. The low surface brightness limits of the survey ({mu}_g_~31mag/arcsec^2^ on a 1' scale) allow us to implement a method, based on integrating the 1D surface brightness profile, that is minimally dependent on any parameterization. We construct a sample of 1188 massive galaxies with logM_*_/M_{sun}_>10.75 based on the Galaxy Mass and Assembly (GAMA) survey and measure their total luminosities and g-r colors. We then compare our measurements to various established methods applied to imaging from the Sloan Digital Sky Survey (SDSS), focusing on those favored by the GAMA survey. In general, we find that galaxies are brighter in the r band by an average of ~0.05mag and bluer in g-r colors by ~0.06mag compared to the GAMA measurements. These two differences have opposite effects on the stellar-mass estimates. The total luminosities are larger by 5% but the mass-to-light ratios are lower by ~10%. The combined effect is that the stellar-mass estimate of massive galaxies decreases by 7%. This, in turn, implies a small change in the number density of massive galaxies: <=30% at logM_*_/M_{sun}_>=11. Description: The main data set we use in this study is the Dragonfly Wide Field Survey (DWFS), presented in Danieli+ (2020ApJ...894..119D). The DWFS is an imaging survey carried out with the 48-lens Dragonfly Telephoto Array. DWFS has surveyed 330deg^2^ of the well-studied Stripe 82 and GAMA fields in g and r bands. Dragonfly is located at the New Mexico Skies observatory. We focused on the part of the survey that overlaps with the Galaxy And Mass Assembly (GAMA) equatorial fields (DR3; Baldry+ 2018, J/MNRAS/474/3875). See Section 2. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file dwfsphot.dat 104 1188 Photometry measurements for massive galaxies in the Dragonfly Wide Field Survey (DWFS) -------------------------------------------------------------------------------- See also: III/88 : Stellar Spectrophotometric Atlas (Gunn+ 1983) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) II/357 : The Dark Energy Survey (DES): Data Release 1 (Abbott+, 2018) I/345 : Gaia DR2 (Gaia Collaboration, 2018) V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020) II/371 : The Dark Energy Survey (DES): Data Release 2 (Abott+, 2021) I/356 : Gaia DR3 Part 2. Extra-galactic (Gaia Collaboration, 2022) J/AJ/130/873 : BQS objects in the SDSS DR3 area (Jester+, 2005) J/AJ/130/2647 : Tidal features of nearby red galaxies (van Dokkum+, 2005) J/A+A/523/A48 : Gaia photometry (Jordi+, 2010) J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011) J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011) J/MNRAS/421/3027 : Statisical study of galaxy dust emissions (Bourne+, 2012) J/ApJS/210/3 : SDSS bulge, disk & total stellar masses (Mendel+, 2014) J/MNRAS/446/120 : ATLAS3D project. XXIX (Duc+, 2015) J/MNRAS/446/3943 : galaxies 2D phot. decompositions in SDSS-DR7 (Meert+, 2015) J/MNRAS/456/2221 : Optically red galaxies in H-ATLAS/GAMA (Dariush+, 2016) J/MNRAS/464/1306 : LARGESS survey (Ching+, 2017) J/ApJ/836/115 : Double-component model fitting of galaxies (Oh+, 2017) J/AJ/156/18 : APOGEE: binary comp. of evolved stars (Price-Whelan+, 2018) J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018) J/ApJ/877/103 : Half-mass radii for galaxies at 1.0<=z<=2.5 (Suess+, 2019) J/AJ/159/103 : SDSS & GAMA dwarf gal. mergers with HSC (Kado-Fong+, 2020) http://legacysurvey.org/ : DESI Legacy Survey home page http://skyserver.sdss.org/dr14 : SDSS DR14 data access home page Byte-by-byte Description of file: dwfsphot.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 E10.5 deg RAdeg [129/223.5] Right ascension (J2000) 12- 22 E11.5 deg DEdeg [-2.5/2.5] Declination (J2000) 24- 30 I7 --- GAMA [6882/3913469] Unique galaxy ID used in the GAMA database (CataId) 32- 49 I18 --- objID SDSS DR7 object ID 51- 60 E10.5 mag gmag [15.33/20.05] Dragonfly measured g-band magnitude converted to SDSS filter system (AB) 62- 71 E10.5 --- fextp-g [8.4e-6/0.0982] g f_extp_ - g-band fraction of flux contained in the exponential extrapolation (1) 73- 82 E10.5 mag rmag [14.6/19.09] Dragonfly measured r-band magnitude converted to SDSS filter system (AB) 84- 93 E10.5 --- fextp-r [8.9e-6/0.092] r f_extp - r-band fraction of flux contained in the exponential extrapolation (1) 95- 104 E10.5 mag g-r [0.068/2.48] g-r color index (2) -------------------------------------------------------------------------------- Note (1): The extrapolated fraction of the total flux, f_extp_ is: f_extp_=S_extp_/(S_extp_+S_obs_) where S_obs_ is the observed flux and S_extp_ is the extrapolated flux; see Section 2.5. Note (2): Dragonfly measured g-r color using the total magnitudes, corrected for differential extinction and converted to SDSS filter system. -------------------------------------------------------------------------------- History: Downloaded at: http://tbmiller-astro.github.io/data/ References: Danieli et al. Paper I. 2020ApJ...894..119D ================================================================================ (End) Emmanuelle Perret [CDS] 09-Aug-2022