J/ApJ/894/75 Ultra-diffuse & LSB dwarf galaxies in A370 from HFF (Lee+, 2020)
The nature of ultra-diffuse galaxies in distant massive galaxy clusters:
A370 in the Hubble Frontier Fields.
Lee J.H., Kang J., Lee M.G., Jang In S.
<Astrophys. J., 894, 75 (2020)>
=2020ApJ...894...75L 2020ApJ...894...75L
ADC_Keywords: Photometry, HST; Galaxies, IR; Optical; Morphology
Keywords: Low surface brightness galaxies ; Dwarf galaxies ; Galaxy clusters
Abstract:
We report the discovery of ultra-diffuse galaxies (UDGs) in Abell 370
(A370; z=0.375). We find 46 UDGs in A370 from the images of the Hubble
Frontier Fields. Most UDGs are low-luminosity red sequence galaxies,
while a few of them are blue UDGs. We estimate the abundance of UDGs
in A370, N(UDG)=644±104. Combining these results with those of Abell
S1063 (z=0.348) and Abell 2744 (z=0.308), we derive a mean radial
number density profile of UDGs in the three clusters. The number
density profiles of UDGs and bright galaxies show a discrepancy in the
central region of the clusters: the profile of UDGs shows a flattening
as clustercentric distance decreases, while that of bright galaxies
shows a continuous increase. This implies that UDGs are prone to
disruption in the central region of the clusters. The relation between
the abundance of UDGs and virial masses of their host systems is
described by a power law with an index of nearly one:
N(UDG)∝M2000.99±0.05 for M200>1013M☉. We
estimate approximately dynamical masses of UDGs using the fundamental
manifold method and find that most UDGs have dwarf-like masses
(M200<1011M☉). This implies that most UDGs have a dwarf-like
origin and a small number of them could be failed L* galaxies. These
results suggest that multiple origins may contribute to the formation
and evolution of UDGs in massive galaxy clusters.
Description:
We obtained deep and high-resolution images of A370 from the Hubble
Frontier Fields (HFF) archive (Lotz+ 2017ApJ...837...97L 2017ApJ...837...97L). We chose
drizzled images of ACS/WFC F606W(V), F814W(I), WFC3/IR F105W(Y), and
F160W(H) for our analysis. The HFF images we used cover two fields
with different clustercentric distances (r/r200): the central field
(r/r200<0.2) and the parallel field (r/r200∼0.6-0.8) located at 5.9"
southeast of the central field.
We adopt the ΛCDM cosmological parameters with H0=73km/s/Mpc,
ΩM=0.27, and ΩΛ=0.73. The luminosity distance
of A370 for these parameters is dL=1942Mpc, and the angular diameter
distance is dA=1028Mpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 90 46 A catalog of ultra-diffuse galaxies (UDGs)
in Abell 370
table5.dat 90 112 A catalog of low surface brightness (LSB)
dwarf galaxies in Abell 370
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)
J/ApJ/653/240 : Low-mass SDSS dwarf galaxy properties (Geha+, 2006)
J/ApJ/638/725 : Fundamental manifold of spheroids (Zaritsky+, 2006)
J/AJ/134/945 : Tully-Fisher relation for SDSS galaxies (Pizagno+, 2007)
J/ApJS/172/599 : SFI++ II. I-band Tully-Fisher catalog (Springob+, 2007)
J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJ/768/172 : Kinematics of red giant in M31 dSphs (Collins+, 2013)
J/ApJ/813/L15 : Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
J/ApJ/819/162 : Chandra obs. of ultracompact dwarf galaxies (Pandya+, 2016)
J/ApJS/225/11 : Subaru-UDGs in the Coma cluster (Yagi+, 2016)
J/MNRAS/469/3946 : Abell 370 MUSE redshifts (Lagattuta+, 2017)
J/ApJ/844/157 : Ultradiffuse gal. found in HST images of HFF (Lee+, 2017)
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/858/102 : Gemini/NIFS and HST obs. of the galaxy M59-UCD3 (Ahn+, 2018)
J/ApJ/857/104 : Low surface brightness galaxies from HSC-SSP (Greco+, 2018)
J/ApJ/859/52 : NGFS. III. Dwarf galaxies (Ordenes-Briceno+, 2018)
J/MNRAS/491/3496 : Andromeda XIX member stars (Collins+, 2020)
Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Name of galaxy (1)
9- 17 F9.5 deg RAdeg [39.94/40.08] Right Ascension (J2000)
19- 27 F9.5 deg DEdeg [-1.65/-1.55] Declination (J2000)
29- 33 F5.2 mag F814W [23.9/27.8] Integrated magnitude in HST
ACS/WFC F814W band
35- 38 F4.2 mag e_F814W [0.01/0.1] Uncertainty in F814W
40- 44 F5.2 mag I-Y [-0.5/0.5] F814W-F105W color index
46- 49 F4.2 mag e_I-Y [0.01/0.1] Uncertainty in I-Y
51- 54 F4.2 kpc Reffc [1/6.2] Circularized effective radius (2)
56- 59 F4.2 kpc e_Reffc [0.02/0.6] Uncertainty in Reffc
61- 65 F5.2 mag/arcsec2 muabs [23.8/25.5] Absolute mean effective surface
brightness in r' band (3)
67- 70 F4.2 mag/arcsec2 e_muabs [0.02/0.8] Uncertainty in muabs
72- 75 F4.2 --- n [0.18/2.8] Sersic index from GALFIT
77- 80 F4.2 --- e_n [0.02/0.6] Uncertainty in n
82- 85 F4.2 --- q [0.32/1] Axis ratio from GALFIT
87- 90 F4.2 --- e_q [0/0.3] Uncertainty in q
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Note (1): LSB galaxies include ultra-diffuse galaxies (UDGs) and LSB dwarfs
(LDws). "C" and "P" in the names of these LSB galaxies mean the
central field and the parallel field of A370, respectively.
Note (2): Reffc=Reff(b/a)0.5 for the adopted distance scale
of 4.984kpc/arcsec.
Note (3): muabs=<µ>e(r')-10*log(1+z)-E(z)-K(z) at the redshift
of z=0.375 (Lee+ 2017, J/ApJ/844/157).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Sep-2021