J/ApJ/844/157 Ultradiffuse galaxies found in deep HST images of HFF (Lee+, 2017)
Detection of a large population of ultradiffuse galaxies in massive galaxy
clusters: Abell S1063 and Abell 2744.
Lee M.G., Kang J., Lee J.H., Jang In S.
<Astrophys. J., 844, 157 (2017)>
=2017ApJ...844..157L 2017ApJ...844..157L
ADC_Keywords: Galaxies, IR ; Photometry, HST ; Morphology ; Clusters, galaxy
Keywords: galaxies: clusters: individual (Abell S1063, Abell 2744);
galaxies: dwarf; galaxies: formation
Abstract:
We present the detection of a large population of ultradiffuse
galaxies (UDGs) in two massive galaxy clusters, Abell S1063 at z=0.348
and Abell 2744 at z=0.308, based on F814W and F105W images in the
Hubble Frontier Fields Program. We find 47 and 40 UDGs in Abell S1063
and Abell 2744, respectively. Color-magnitude diagrams of the UDGs
show that they are mostly located at the faint end of the red
sequence. From the comparison with simple stellar population models,
we estimate their stellar mass to range from 108 to 109M☉.
Radial number density profiles of the UDGs show a turnover or a
flattening in the central region at r<100kpc. We estimate the total
masses of the UDGs using the galaxy scaling relations. A majority of
the UDGs have total masses M200=1010-1011M☉, and only a
few of them have total masses M200=1011-1012M☉. The total
number of UDGs within the virial radius is estimated to be
N(UDG)=770±114 for Abell S1063 and N(UDG)=814±122 for Abell 2744.
Combining these results with data in the literature, we fit the
relation between the total numbers of UDGs and the masses of their
host systems for M200>1013M☉ with a power law,
N(UDG)=M2001.05±0.09. These results suggest that a majority of
the UDGs have a dwarf galaxy origin, while only a small number of the
UDGs are massive L* galaxies that failed to form a normal population
of stars.
Description:
Abell S1063 and Abell 2744 are located at redshift z=0.348 and
z=0.308, respectively, so their HST fields cover a relatively large
fraction of each cluster. They are part of the target galaxy clusters
in the Hubble Frontier Fields (HFF) Program, for which deep Hubble
Space Telescope (HST) images are available (Lotz+ 2017ApJ...837...97L 2017ApJ...837...97L).
We used ACS/F814W(I) and WFC3/F105W(Y) images for Abell S1063 and
Abell 2744 in the HFF. The effective wavelengths of the F814W and
F105W filters for the redshifts of Abell S1063 and Abell 2744 (6220
and 8030Å) correspond approximately to SDSS r' and Cousins I (or
SDSS i') in the rest frame, respectively. Figure 1 display color
images of the HST fields for Abell S1063 and Abell 2744.
In this study we adopt the cosmological parameters H0=73km/s/Mpc,
ΩM=0.27, and ΩΛ=0.73. For these parameters,
luminosity distance moduli of Abell S1063 and Abell 2744 are
(m-M)0=41.25 (d=1775Mpc) and 40.94 (d=1540Mpc), and angular diameter
distances are 978 and 901Mpc, respectively.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
clusters.dat 35 2 *Galaxy cluster targets; table added by CDS
table1.dat 119 47 A catalog of ultradiffuse galaxies (UDGs)
in Abell S1063 --from erratum published in
2020, ApJ, 894, 83
table2.dat 119 143 A catalog of low surface brightness (LSB) dwarfs
in Abell S1063 --from erratum published in
2020, ApJ, 894, 83
table3.dat 119 40 A catalog of UDGs in Abell 2744
--from erratum published in 2020, ApJ, 894, 83
table4.dat 119 93 A catalog of LSB dwarfs in Abell 2744
--from erratum published in 2020, ApJ, 894, 83
--------------------------------------------------------------------------------
Note on clusters.dat: Parameters are taken from the "Description" section above.
--------------------------------------------------------------------------------
See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/A+A/449/461 : Radial velocities in A2744 (Boschin+, 2006)
J/ApJ/728/27 : Chandra & AAOmega observations of Abell 2744 (Owers+, 2011)
J/ApJ/811/29 : GLASS. IV. Lensing cluster Abell 2744 (Wang+, 2015)
J/ApJ/813/L15 : Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
J/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015)
J/A+A/590/A31 : ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016)
J/ApJ/833/167 : PAndAS view of Andromeda satellites. II. (Martin+, 2016)
J/ApJS/225/11 : Subaru-UDGs in the Coma cluster (Yagi+, 2016)
J/A+A/597/A41 : ALMA Frontier Fields Survey. I. (Gonzalez-Lopez+, 2017)
Byte-by-byte Description of file: clusters.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Cl Cluster name as in tables 1-4
8- 12 F5.3 --- z Redshift
14- 18 F5.2 --- m-M Luminosity distance modulus
20- 23 I4 Mpc Dist Distance in Mpc
25- 35 A11 --- Name Full name
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table[1234].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Cl Cluster identifier
7 A1 --- --- [_]
8- 12 A5 --- Type Galaxy type ("UDG" for ultradiffuse
galaxies; or "LSBdw" for low surface
brightness dwarfs)
13- 15 I03 --- ID [1/143] Galaxy identification
(unique within Cl and Type)
17- 25 F9.5 deg RAdeg Right Ascension (J2000)
27- 35 F9.5 deg DEdeg Declination (J2000)
37- 40 F4.2 kpc Reff [1/5.8] Effective radius from GALFIT
42- 45 F4.2 kpc e_Reff [0.04/2.1] Uncertainty in Reff
47- 51 F5.2 mag/arcsec2 mueff [24.7/28.1] Surface brightness from GALFIT
53- 56 F4.2 mag/arcsec2 e_mueff [0.03/0.8] Uncertainty in mueff
58- 62 F5.2 mag Imag [23.8/28] Integrated AB magnitude in HST/ACS
F814W band
64- 67 F4.2 mag e_Imag [0/0.2] Uncertainty in F814W
69- 73 F5.2 mag color [-0.6/0.5] F814W - F105W color index
75- 78 F4.2 mag e_color [0/0.2] Uncertainty in color
80- 83 F4.2 --- n [0.18/4] Sersic index from GALFIT
85- 88 F4.2 --- e_n [0.02/1.1] Uncertainty in n
90- 93 F4.2 --- q [0.3/1] Axis ratio from GALFIT
95- 98 F4.2 --- e_q [0.01/0.3] Uncertainty in q
100-103 F4.2 kpc Reffc [1/5] Circularized effective radius
105-108 F4.2 kpc e_Reffc [0.04/2] Uncertainty in Reffc
110-114 F5.2 mag/arcsec2 muabs [23.8/26.5] Absolute mean effective surface
brightness
116-119 F4.2 mag/arcsec2 e_muabs [0.03/1.2] Uncertainty in muabs
--------------------------------------------------------------------------------
History:
From electronic version of the journal
17-May-2018:Insert into VizieR
13-May-2020: Tables 1-4 updated from erratum published in
2020, ApJ, 894, 83
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Mar-2018