J/ApJS/257/60 SMUDGes. II. Expanded survey & Stripe 82 cat. (Zaritsky+, 2021)
Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes).
II. Expanded survey description and the Stripe 82 catalog.
Zaritsky D., Donnerstein R., Karunakaran A., Barbosa C.E., Dey A.,
Kadowaki J., Spekkens K., Zhang H.
<Astrophys. J. Suppl. Ser., 257, 60 (2021)>
=2021ApJS..257...60Z 2021ApJS..257...60Z
ADC_Keywords: Galaxy catalogs; Surveys; Morphology; Photometry, ugriz;
Extinction
Keywords: Galaxies ; Low surface brightness galaxies
Abstract:
We present 226 large ultra-diffuse galaxy (UDG) candidates (re>5.3,
µ0,g>24mag/arcsec2) in the SDSS Stripe 82 region recovered
using our improved procedure developed in anticipation of processing
the entire Legacy Surveys footprint. The advancements include less
constrained structural parameter fitting, expanded wavelet filtering
criteria, consideration of Galactic dust, estimates of parameter
uncertainties and completeness based on simulated sources, and
refinements of our automated candidate classification. We have a
sensitivity ∼1mag fainter in µ0,g than the largest published
catalog of this region. Using our completeness-corrected sample, we
find that (1) there is no significant decline in the number of UDG
candidates as a function of µ0,g to the limit of our survey
(∼26.5mag/arcsec2); (1) bluer candidates have smaller Sersic n;
(3) most blue (g-r<0.45mag) candidates have µ0,g≲25mag/arcsec2
and will fade to populate the UDG red sequence we observe to
∼26.5mag/arcsec2; (4) any red UDGs that exist significantly below
our µ0,g sensitivity limit are not descendent from blue UDGs in
our sample; and (5) candidates with lower µ0,g tend to smaller n.
We anticipate that the final SMUDGes sample will contain ∼30 x as many
candidates.
Description:
Stripe 82 is a region encompassing ∼300deg2 along the Celestial
Equator that has been repeatedly imaged by the Sloan Digital Sky
Survey (SDSS) as described by Annis+ (2014, J/ApJ/794/120) and
Jiang+ (2014ApJS..213...12J 2014ApJS..213...12J).
A detailed description of the Legacy Surveys is available in
Dey+ (2019AJ....157..168D 2019AJ....157..168D). Briefly, the data consist of a three-band
imaging survey, with g=24.7, r=23.9, and z=23.0 AB mag, five-sigma
point-source limits, obtained using DECam at the CTIO 4m (DECaLS), an
upgraded MOSAIC camera at the KPNO 4m (MzLS; Mayall z-band Legacy
Survey), and the 90Prime camera at the Steward Observatory 2.3m
telescope (BASS, Beijing-Arizona Sky Survey).
In this paper, we reanalyze the CCD images associated with the Eighth
data release (DR8) of the Legacy Surveys. See Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 326 226 The Catalog
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See also:
II/371 : The Dark Energy Survey (DES): Data Release 2 (Abott+, 2021)
J/ApJS/105/209 : Low surface brightness galaxies. I. The Cat. (Impey+ 1996)
J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007)
J/AJ/142/3 : 1.4GHz observations of Stripe 82 (Hodge+, 2011)
J/ApJ/794/120 : Sloan Digital Sky Survey coadd. Stripe 82 (Annis+, 2014)
J/MNRAS/446/120 : ATLAS3D project. XXIX (Duc+, 2015)
J/ApJ/813/L15 : Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
J/MNRAS/456/1359 : IAC Stripe 82 Legacy Project: Photometry (Fliri+, 2016)
J/A+A/594/A32 : 3XMM/SDSS Stripe 82 Galaxy Cluster Survey. I. (Takey+, 2016)
J/ApJ/842/133 : HI-bearing ultra-diffuse ALFALFA galaxies (Leisman+, 2017)
J/MNRAS/468/703 : Abell 168 ultra-diffuse galaxies distribution (Roman+, 2017)
J/A+A/608/A142 : Fornax Deep Survey with VST. III. LSB gal. (Venhola+, 2017)
J/MNRAS/470/1512 : Faint LSB galaxy cand. in Perseus cluster (Wittmann+, 2017)
J/ApJ/857/104 : Low surface brightness galaxies from HSC-SSP (Greco+, 2018)
J/AJ/157/212 : Ultra-diffuse galaxies at UV wavelengths (Singh+, 2019)
J/ApJS/240/1 : SMUDGes. I. First results in Coma Cluster (Zaritsky+, 2019)
J/ApJS/247/46 : Opt. phot. of SMUDGes ultra-diffuse gal. (Barbosa+, 2020)
J/ApJ/902/39 : GBT HI obs. of ultradiffuse galaxies (Karunakaran+, 2020)
http://www.legacysurvey.org/ : DESI Legacy Imaging Surveys home page
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SMDG]
5- 18 A14 --- SMDG Galaxy Name in SMDG Catalog
(HHMMSSs+DDMMSS; J2000)
20- 28 F9.5 deg RAdeg [-50/44] Right Ascension (J2000)
30- 37 F8.5 deg DEdeg [-3.4/3.5] Declination (J2000)
39- 43 F5.2 arcsec Re [5.3/30.5] Effective radius (angular)
45 A1 --- --- [-] Minus sign is ignored in VizieR
46- 49 F4.2 arcsec E_Re [0.01/4.85] 1σ upper
uncertainty in Re (only absolute value
is kept at CDS)
51- 55 F5.2 arcsec Re-bias [-5.13/36] Effective radius measurement
bias (corrected Re = Re - Re-bias)
58- 62 F5.2 arcsec e_Re [0.03/38.64] 1 sigma lower
uncertainty (angular)
64 I1 --- f_Re [0/1] 0 = good; 1 = extrapolated
66- 69 F4.2 --- b/a [0.38/0.99] Minor to major axis ratio
71- 74 F4.2 --- E_b/a [0.01/0.13] 1 sigma upper uncertainty
76- 80 F5.2 --- b/a-bias [-0.17/0.04] Bias
(corrected b/a = b/a - b/a_bias)
82- 86 F5.2 --- e_b/a [-0.51/-0] 1 sigma lower uncertainty
88 I1 --- f_b/a [0/1] 0 = good; 1 = extrapolated
90- 93 F4.2 --- n [0.18/1.98] Sersic index
95- 99 F5.2 --- E_n [-0.07/1.53] 1 sigma upper uncertainty
101- 105 F5.2 --- n-bias [-0.52/0.5] Bias
(corrected n = n - n_bias)
107- 111 F5.2 --- e_n [-1.17/0.24] 1 sigma lower uncertainty
113 I1 --- f_n [0/1] 0 = good; 1 = extrapolated
115- 120 F6.2 deg PA [-88.17/89.16] Position angle of
major axis measured North to East
122- 126 F5.2 deg E_PA [0.5/58] 1 sigma upper uncertainty
128- 132 F5.2 deg PA-bias [-3.9/52.5] Bias
(corrected PA=PA-PA_bias)
134- 140 F7.2 deg e_PA [-137/-0.41] 1 sigma lower uncertainty
142 I1 --- f_PA [0/1] 0 = good; 1 = extrapolated
144- 148 F5.2 mag/arcsec2 mu0g [0/27.3] Central surface brightness
in g, AB Mag (1)
150- 154 F5.2 mag/arcsec2 E_mu0g [-0.1/1.31] 1 sigma upper uncertainty
156- 160 F5.2 mag/arcsec2 mu0g-bias [-0.5/0.64] Bias
(corrected mu0g = mu0g - mu0g_bias)
162- 166 F5.2 mag/arcsec2 e_mu0g [-0.51/0.3] 1 sigma lower uncertainty
168 I1 --- f_mu0g [0/1] 0 = good; 1 = extrapolated
170- 174 F5.2 mag/arcsec2 mu0r [23.36/27.23] Central surface
brightness in r, AB Mag (1)
176- 180 F5.2 mag/arcsec2 E_mu0r [-0.25/1.51] 1 sigma upper uncertainty
182- 186 F5.2 mag/arcsec2 mu0r-bias [-0.02/0.8] Bias
(corrected mu0r = mu0r - mu0r_bias)
188- 192 F5.2 mag/arcsec2 e_mu0r [-0.7/0.52] 1 sigma lower uncertainty
194 I1 --- f_mu0r [0/1] 0 = good; 1 = extrapolated
196- 200 F5.2 mag/arcsec2 mu0z [0.0/26.49] Central surface
brightness in z, AB Mag (1)
202- 206 F5.2 mag/arcsec2 E_mu0z [-0.3/1.65] 1 sigma upper uncertainty
208- 212 F5.2 mag/arcsec2 mu0z-bias [-0.5/0.7] Bias
(corrected mu0z = mu0z - mu0z_bias)
214- 218 F5.2 mag/arcsec2 e_mu0z [-0.4/4.63] 1 sigma lower uncertainty
220 I1 --- f_mu0z [0/1] 0 = good; 1 = extrapolated
222- 226 F5.2 mag gmag [0/22.21] Total apparent g mag, AB
Mag (1)
228- 232 F5.2 mag E_gmag [-0.8/1.61] 1 sigma upper uncertainty
234- 238 F5.2 mag gmag-bias [-0.06/0.9] Bias
(corrected m_g = m_g - mgbias)
240- 244 F5.2 mag e_gmag [-0.66/0.5] 1 sigma lower uncertainty
246 I1 --- f_gmag [0/1] 0 = good; 1 = extrapolated
248- 252 F5.2 mag rmag [16.9/22] Total apparent r mag, AB
Mag (1)
254- 258 F5.2 mag E_rmag [-0.53/2] 1 sigma upper uncertainty
260- 264 F5.2 mag rmag-bias [-0.06/0.9] Bias
(corrected m_r = m_r - mrbias)
266- 270 F5.2 mag e_rmag [-0.35/0.62] 1 sigma lower uncertainty
272 I1 --- f_rmag [0/1] 0 = good; 1 = extrapolated
274- 278 F5.2 mag zmag [0/21.2] Total apparent z mag, AB Mag
(1)
280- 284 F5.2 mag E_zmag [-0.4/1.4] 1 sigma upper uncertainty
286- 290 F5.2 mag zmag-bias [-0.5/0.83] Bias
(corrected m_z = m_z - mzbias)
292- 296 F5.2 mag e_zmag [-1.91/0.53] 1 sigma lower uncertainty
298 I1 --- f_zmag [0/1] 0 = good; 1 = extrapolated
300- 303 F4.2 --- SFD [0.02/0.06] Optical depth at location
from Schlegel et al. maps
305- 308 F4.2 mag Agmag [0.06/0.2] Corresponding extinction
in g band
310- 313 F4.2 mag Armag [0.04/0.14] Corresponding extinction
in r band
315- 318 F4.2 mag Azmag [0.02/0.08] Corresponding extinction
in z band
320- 324 F5.2 --- comp [-0.06/0.73] Fractional completeness
326 I1 --- f_comp [0/2] 0 = good, 1=extrapolated
completeness, 2=biases extrapolated
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Note (1): Magnitudes not extinction corrected
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History:
From electronic version of the journal
References:
Zaritsky et al. Paper I. 2019ApJS..240....1Z 2019ApJS..240....1Z Cat. J/ApJS/240/1
Zaritsky et al. Paper II. 2021ApJS..257...60Z 2021ApJS..257...60Z This catalog
Zaritsky et al. Paper III. 2022ApJS..261...11Z 2022ApJS..261...11Z Cat. J/ApJS/261/11
Zaritsky et al. Paper V. 2023ApJS..267...27Z 2023ApJS..267...27Z Cat. J/ApJS/267/27
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Mar-2022