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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
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). 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 118 45 A catalog of ultradiffuse galaxies (UDGs) in Abell S1063 table2.dat 118 115 A catalog of low surface brightness (LSB) dwarfs in Abell S1063 table3.dat 118 39 A catalog of UDGs in Abell 2744 table4.dat 118 78 A catalog of LSB dwarfs in Abell 2744
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 [1/115] 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- 72 F4.2 mag color [0/0.5] F814W - F105W color index 74- 77 F4.2 mag e_color [0/0.2] Uncertainty in color 79- 82 F4.2 --- n [0.2/4] Sersic index from GALFIT 84- 87 F4.2 --- e_n [0.03/1.1] Uncertainty in n 89- 92 F4.2 --- q [0.3/1] Axis ratio from GALFIT 94- 97 F4.2 --- e_q [0.01/0.3] Uncertainty in q 99-102 F4.2 kpc Reffc [1/5] Circularized effective radius 104-107 F4.2 kpc e_Reffc [0.04/2] Uncertainty in Reffc 109-113 F5.2 mag/arcsec2 muabs [23.8/26.5] Absolute mean effective surface brightness 115-118 F4.2 mag/arcsec2 e_muabs [0.03/0.8] Uncertainty in muabs
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Mar-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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