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J/AJ/136/2295  Ultra-compact dwarf candidates in Abell S0740  (Blakeslee+, 2008)

Ultra-compact dwarf candidates near the lensing galaxy in Abell S0740. Blakeslee J.P., Degraaff R.B. <Astron. J., 136, 2295-2305 (2008)> =2008AJ....136.2295B
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, HST Keywords: galaxies: clusters: individual (Abell S0740) - galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: individual (ESO 325-G004) Abstract: We analyze three-band imaging data of the giant elliptical galaxy ESO 325-G004 from the Hubble Space Telescope Advanced Camera for Surveys (ACS). This is the nearest known strongly lensing galaxy, and it resides in the center of the poor cluster Abell S0740 at redshift z=0.034. Based on magnitude, color, and size selection criteria, we identify a sample of 15 ultra-compact dwarf (UCD) galaxy candidates within the ACS field. Description: ESO 325-G004 was imaged with the ACS/WFC in the F475W, F625W, and F814W filters. Throughout this paper, we refer to magnitudes in these filters as g475, r625, and I814, respectively. The galaxy was initially observed in F814W and F475W as part of the HST GO Program 10429 during 2005 January. There were 22 F814W exposures of varying times totaling 18882s, and three exposures in F475W of 367s each. In 2006 February, further imaging of the ESO 325-G004 field was carried out by the HST DD Program 10710 for a Hubble Heritage public release image. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 92 41 Ultra-compact dwarf (UCD) candidates and compact galaxies
See also: J/A+A/383/823 : Radial velocities of UCOs in Fornax (Mieske+, 2002) J/A+A/418/445 : FCOS Ultra Compact Dwarf galaxies radial vel. (Mieske+, 2004) J/A+A/472/111 : Centaurus Compact Object Survey (Mieske+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- [BD2008] [211/5503] Identification number 6- 14 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 16- 24 F9.5 deg DEdeg Declination in decimal degrees (J2000) 26- 31 F6.3 mag Imag HST/ACS F814W magnitude 33- 37 F5.3 mag e_Imag rms uncertainty on Imag 39- 43 F5.3 mag r-I HST/ACS F625W-F814W colour index 45- 49 F5.3 mag e_r-I rms uncertainty on r-I 51- 55 F5.3 mag g-I HST F475W-F814W colour index 57- 61 F5.3 mag e_g-I rms uncertainty on g-I 63- 66 F4.2 --- b/a Axis ratio measured by SExtractor; no PSF correction 68- 71 F4.2 --- q Intrinsic axis ratio q=b/a=1-ε from our two-dimensional modeling with PSF correction 73- 77 F5.1 pc Rc Fitted circularized effective radius, Rc=Re*sqrt(q) 79- 85 E7.2 Msun Mass Photometrically derived stellar mass estimate 87- 92 A6 --- MType Morphological type from our visual inspection. All objects in Figure 8 are type UCD; see text for further details
History: * 30-Jul-2011: From electronic version of the journal * 22-Nov-2013: Table 1 corrected (one line added)
(End) Patricia Vannier [CDS] 24-May-2011
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