J/ApJS/240/1 SMUDGes. I. First results in the Coma Cluster (Zaritsky+, 2019)
Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes).
I. Survey description and first results in the Coma Galaxy Cluster and environs.
Zaritsky D., Donnerstein R., Dey A., Kadowaki J., Zhang H., Karunakaran A.,
Martinez-Delgado D., Rahman M., Spekkens K.
<Astrophys. J. Suppl. Ser., 240, 1 (2019)>
=2019ApJS..240....1Z 2019ApJS..240....1Z
ADC_Keywords: Galaxies, photometry; Clusters, galaxy; Surveys; Optical
Keywords: galaxies: evolution ; galaxies: fundamental parameters ;
galaxies: structure
Abstract:
We present a homogeneous catalog of 275 large (effective radius
≳5.3") ultra-diffuse galaxy (UDG) candidates lying within an
∼290deg2 region surrounding the Coma Cluster. The catalog results
from our automated postprocessing of data from the Legacy Surveys, a
three-band imaging survey covering 14000deg2 of the extragalactic
sky. We describe a pipeline that identifies UDGs and provides their
basic parameters. The survey is as complete in these large UDGs as
previously published UDG surveys of the central region of the Coma
Cluster. We conclude that the majority of our detections are at
roughly the distance of the Coma Cluster, implying effective radii
≥2.5kpc, and that our sample contains a significant number of analogs
of DF44 (SMDG1300580+265835), where the effective radius exceeds 4kpc,
both within the cluster and in the surrounding field. The g-z color of
our UDGs spans a large range, suggesting that even large UDGs may
reflect a range of formation histories. A majority of the UDGs are
consistent with being lower stellar mass analogs of red sequence
galaxies, but we find both red and blue UDG candidates in the vicinity
of the Coma Cluster and a relative overabundance of blue UDG
candidates in the lower-density environments and the field. Our
eventual processing of the full Legacy Surveys data will produce the
largest, most homogeneous sample of large UDGs.
Description:
In preparation for the DESI program, the DESI collaboration has
undertaken the Legacy Surveys, a deep three-band (g=24.7, r=23.9, and
z=23.0 AB mag, 5σ point-source limits) imaging survey 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).
The original planned footprint has 9000deg2 observed by DECaLS and
5000deg2 observed by MzLS and BASS. DECaLS, MzLS, and BASS data are
already publicly available at the National Optical Astronomy
Observatory (NOAO) science archives and the Legacy Surveys website
(legacysurvey.org).
Here we present the 275 large (effective radii re≳5.3", corresponding
to physical values ≥2.5kpc at the distance of Coma) ultra-diffuse
galaxy (UDG) candidates identified within an ∼10° radius of the
Coma Cluster using publicly released, reduced data from the DECaLS
survey that were available as of 2018 April 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 132 275 Ultra diffuse galaxy (UDG) properties
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See also:
J/ApJS/137/117 : Las Campanas Distant Cluster Survey (LCDCS) (Gonzales+, 2001)
J/AJ/127/704 : Low surface brightness galaxies in SDSS (Kniazev+, 2004)
J/ApJS/172/615 : GALFIT result for GEMS galaxies (Haussler+, 2007)
J/ApJ/772/82 : A catalog of globular cluster systems (Harris+, 2013)
J/MNRAS/446/120 : ATLAS3D project. XXIX (Duc+, 2015)
J/ApJ/813/L15 : Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
J/ApJS/225/11 : Subaru-UDGs in the Coma cluster (Yagi+, 2016)
J/ApJ/844/157 : UDGs found in deep HST images of HFF (Lee+, 2017)
J/ApJ/842/133 : HI-bearing ultra-diffuse ALFALFA galaxies (Leisman+, 2017)
J/A+A/608/A142 : Fornax Deep Survey with VST. III. LSB gal. (Venhola+, 2017)
J/ApJ/857/104 : Low surface brightness galaxies from HSC-SSP (Greco+, 2018)
J/ApJ/857/144 : Tidal features from RESOLVE + DECaLS surveys (Hood+, 2018)
http://www.desi.lbl.gov/ : The Dark Energy Spectrocopic Instrument (DESI) page
http://archive.noao.edu/ : NOAO science archive home page
http://www.legacysurvey.org/ : Legacy surveys home page
Byte-by-byte Description of file: table2.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- 30 F11.7 deg RAdeg Right Ascension, decimal degrees (J2000)
32- 41 F10.7 deg DEdeg Declination, decimal degrees (J2000)
43- 46 F4.1 mag/arcsec2 mu0g [24/26.3]?=0 Central surface brightness,
g band, fixed n=1 model fit (1)
48- 51 F4.1 mag/arcsec2 mu0r [22/26]?=0 Central surface brightness,
r band, fixed n=1 model fit (1)
53- 56 F4.1 mag/arcsec2 mu0z [21/26]?=0 Central surface brightness,
z band, fixed n=1 model fit (1)
58- 60 F3.1 mag/arcsec2 e_mu0g [0.1/0.7]?=0 1sigma uncertainty in mu0g (1)
62- 64 F3.1 mag/arcsec2 e_mu0r [0.1/0.7]?=0 1sigma uncertainty in mu0r (1)
66- 68 F3.1 mag/arcsec2 e_mu0z [0.1/3.4]?=0 1sigma uncertainty in mu0z (1)
70- 73 F4.1 arcsec Re [5.3/75.2] Effective radius, fixed n=1
model fit to full image stack (1)
75- 78 F4.1 arcsec e_Re [0.1/11] 1 sigma uncertainty in Re
80- 83 F4.2 --- b/a [0.3/1] Axis ratio,
fixed n=1 model fit to full image stack
85- 88 F4.2 --- e_b/a [0.01/0.1] 1 sigma uncertainty in b/a
90- 92 I3 deg theta Position angle, measured N to E,
fixed n=1 model fit to full image stack
94- 96 I3 deg e_theta [1/186] 1 sigma uncertainty in theta
98-101 F4.1 mag gtmag [16/22.5]?=0 CTIO/DECam g band total
apparent AB magnitude, floating n model
fit (1)
103-106 F4.1 mag rtmag [14.7/22.4]?=0 CTIO/DECam r band total
apparent AB magnitude, floating n model
fit (1)
108-111 F4.1 mag ztmag [16.6/22.3]?=0 CTIO/DECam z band total
apparent AB magnitude, floating n model
fit (1)
113-115 F3.1 mag e_gtmag [0.1/2.3]?=0 1 sigma uncertainty in gtmag
117-119 F3.1 mag e_rtmag [0.1/4]?=0 1 sigma uncertainty in rtmag
121-123 F3.1 mag e_ztmag [0.1/4.3]?=0 1 sigma uncertainty in ztmag
125-128 A4 --- [VAM2015] Cross-listing with Large Dragonfly Coma
UDGs (van Dokkum+, 2015ApJ...798L..45V 2015ApJ...798L..45V);
numbers added from Table 3 by CDS
130-132 I3 --- [YKK2016] ? Cross-listing with Large Yagi Coma UDGs
(Yagi+, 2016, J/ApJS/225/11);
numbers added from Table 4 by CDS
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Note (1): The central surface brightness, total magnitudes, and uncertainties
are on the AB magnitude system and were not extinction corrected.
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History:
From electronic version of the journal
References:
Zaritsky et al. Paper II. 2021ApJS..257...60Z 2021ApJS..257...60Z Cat. J/ApJS/257/60
Zaritsky et al. Paper II. 2021ApJS..257...60Z 2021ApJS..257...60Z Cat. J/ApJS/257/60
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] 06-May-2019