2007A&A...469..483R


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET23:58:25

2007A&A...469..483R - Astronomy and Astrophysics, volume 469, 483-501 (2007/7-2)

Unravelling the morphologies of luminous compact galaxies using the HST/ACS GOODS survey.

RAWAT A., KEMBHAVI A.K., HAMMER F., FLORES H. and BARWAY S.

Abstract (from CDS):

Luminous Compact Galaxies (LCGs) (MB≤-20, R1/2≤ 4.5kpc and EW0(OII)≥15Å) constitute one of the most rapidly evolving galaxy populations over the last ∼8Gyr history of the universe. Due to their inherently compact sizes, any detailed quantitative analysis of their morphologies has proved to be difficult in the past. Hence, the morphologies and thereby the local counterparts of these enigmatic sources have been hotly debated. Our aim is to use the high angular resolution, deep, multiband HST/ACS imaging data, from the HST/ACS GOODS survey, to study the quantitative morphology of a complete sample of LCGs in the redshift range 0.5≤z≤1.2. We have derived structural parameters for a representative sample of 39 LCGs selected from the GOODS-S HST/ACS field, using full 2-dimensional surface brightness profile fitting of the galaxy images in each of the four filters available. B435W-z850LP color maps are constructed for the sample to aid in the morphological classification. We then use the rest frame B band bulge flux fraction (B/T) to determine the morphological class of galaxies which are well fit by a bulge+disk two dimensional structure. Mergers were essentially identified visually by the presence of multiple maxima of comparable intensity in the rest frame B band images, aided by the color maps to distinguish them from HII regions. We also make use of the Spitzer 24µm source catalog of sources in the CDFS to derive the dust enshrouded star formation rates (SFR) for some of the sample LCGs We derive the following morphological mix for our sample of intermediate redshift LCGs: Mergers: ∼36%, Disk dominated: ∼22%, S0: ∼20%, Early types: ∼7%, Irr/tadpole: ∼15%. We establish that our sample LCGs are intermediate mass objects with stellar mass ranging from 9.44≤Log10(M/M)≤10.96, with a median mass of Log10(M/M)=10.32. We also derive SFR values ranging from a few to ∼65 M/year as expected for this class of objects. We find that LCGs account for ∼26% of the MB≤-20 galaxy population in the redshift range 0.5≤z≤1.2. We estimate a factor ∼11 fall in the comoving number density of blue LCGs from redshifts 0.5≤z≤1.2 to the current epoch, even though this number is subject to large uncertainties given the small sample size at zero redshift available from the literature. The strong redshift evolution exhibited by LCGs, and the fact that a significant fraction of LCGs are in merging systems, seem to indicate that LCGs might be an important phase in the hierarchical evolution of galaxies. We envisage that some of the LCGs that are classified as merging systems, might go on to rebuild their disks and evolve into disk galaxies in the local universe.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - galaxies: fundamental parameters - galaxies: formation - galaxies: evolution

Nomenclature: Table 1, col(1): [RKH2007] NNNNNN N=39 among (Nos 904260-926217).

Simbad objects: 43

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Number of rows : 43

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ZFOURGE CDFS 10408 G 03 32 11.95807 -27 50 33.8593   23.295   23.665 22.64 ~ 11 0
2 ZFOURGE CDFS 9345 G 03 32 12.61994 -27 51 05.4749   24.789   27.51 23.61 ~ 10 0
3 ZFOURGE CDFS 11039 G 03 32 12.76728 -27 50 12.8476   23.233   23.707 22.50 ~ 13 0
4 ZFOURGE CDFS 24729 EmG 03 32 14.683 -27 43 37.10   25.12   23.658 22.411 ~ 16 0
5 ZFOURGE CDFS 21717 G 03 32 15.356 -27 45 06.92   23.002   23.618 21.740 ~ 20 0
6 [SWM2014] GOODS-S 41115 AGN 03 32 17.139 -27 43 03.32 23.16 23.10   21.068 20.840 ~ 71 0
7 ZFOURGE CDFS 3759 G 03 32 17.27614 -27 54 16.4657   23.395   23.698 22.75 ~ 10 0
8 [GFG2013b] 26552 G 03 32 17.678 -27 42 08.86   24.216   24.570 22.664 ~ 11 0
9 [RPF2007] EIS J033217.78-274715.1 G 03 32 17.7659 -27 47 14.866   26.3 23.23 22.345 22.170 ~ 17 0
10 [RKH2007] 907794 G 03 32 18.50556 -27 55 08.2139   24.206   22.709 23.19 ~ 8 0
11 [LBX2017] 348 G 03 32 19.319 -27 45 14.05   23.66 23.013 22.635 21.757 ~ 24 0
12 GOODS-MUSIC 1099 G 03 32 20.7010 -27 55 01.731   29.625 26.710   24.14 ~ 7 0
13 ZFOURGE CDFS 4164 G 03 32 20.85062 -27 54 04.9738   23.458   23.652 22.96 ~ 9 0
14 ZFOURGE CDFS 13550 EmG 03 32 21.428 -27 49 01.71   22.88   22.015 21.733 ~ 15 0
15 [SWM2014] GOODS-S 1903 QSO 03 32 23.02229 -27 54 52.2335 22.85 22.171   21.220 20.972 ~ 22 0
16 [LBX2017] 450 EmG 03 32 25.19402 -27 51 00.0421 23.98 22.762   23.101 22.130 ~ 22 0
17 [LBX2017] 452 G 03 32 25.2602 -27 45 23.968   22.80   21.731 21.402 ~ 24 0
18 [RKH2007] 911843 QSO 03 32 25.3505 -27 45 02.831 23.48 23.15 23.16 22.962 22.75 ~ 25 0
19 ZFOURGE CDFS 11478 EmG 03 32 26.608 -27 50 01.78   23.54   22.488 22.07 ~ 14 0
20 [SWM2014] GOODS-S 45795 Sy2 03 32 27.623 -27 41 44.91   24.05   22.252 21.613 ~ 49 0
21 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1761 1
22 K20S CDFS 42 G 03 32 28.467 -27 48 26.51   24.37 23.107 22.527 22.157 ~ 20 0
23 [RKH2007] 914895 G 03 32 29.70617 -27 45 07.3040 23.92 23.650   23.047 22.42 ~ 23 0
24 ZFOURGE CDFS 8000 EmG 03 32 30.42538 -27 51 40.3513   22.907   22.974 22.53 ~ 13 0
25 [RKH2007] 916137 G 03 32 31.4955 -27 52 41.433   24.67   24.00 23.23 ~ 10 0
26 ZFOURGE CDFS 1755 G 03 32 31.95754 -27 55 53.3316   23.963   23.437 22.80 ~ 9 0
27 [RKH2007] 916866 AGN 03 32 32.59548 -27 53 16.7611   23.863   24.258 23.32 ~ 13 1
28 SN 2002ga SN* 03 32 32.62 -27 53 16.7           ~ 8 1
29 [SWM2014] GOODS-S 4595 EmG 03 32 34.601 -27 53 24.41   23.29   22.624 22.33 ~ 21 0
30 [SWM2014] GOODS-S 37256 AGN 03 32 36.714 -27 44 06.40   22.732   24.355 20.548 ~ 55 0
31 ZFOURGE CDFS 7512 G 03 32 36.7441 -27 52 06.856   23.66   22.759 22.35 ~ 14 0
32 [RKH2007] 920435 Q? 03 32 38.084 -27 52 48.62   24.19   23.785 23.50 ~ 16 0
33 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1228 0
34 [RKH2007] 921406 G 03 32 39.65902 -27 52 26.2092   23.099   23.244 22.69 ~ 14 0
35 [DSS2017] 4559 G 03 32 41.882 -27 48 53.84   23.1819   22.209 22.040 ~ 25 0
36 [RKH2007] 922733 EmG 03 32 42.02868 -27 52 26.0101   23.325   23.326 22.217 ~ 13 0
37 [RKH2007] 922761 G 03 32 42.0862 -27 51 09.394 23.73 24.04     23.17 ~ 12 0
38 ZFOURGE CDFS 7737 G 03 32 42.7293 -27 51 59.238   24.96   23.90 23.33 ~ 14 0
39 [LBX2017] 814 Sy2 03 32 44.4545 -27 49 40.211   25.44   23.54 23.02 ~ 45 0
40 [DDG2006] 053.1941096-27.7545166 QSO 03 32 46.5863 -27 45 16.260 23.97 23.58 23.308 23.21 22.82 ~ 13 0
41 ZFOURGE CDFS 18825 G 03 32 49.5252 -27 46 29.976   22.80   21.539 21.466 ~ 18 0
42 ZFOURGE CDFS 8629 G 03 32 49.87831 -27 51 29.0585   23.046   23.775 22.39 ~ 11 0
43 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1811 1

    Equat.    Gal    SGal    Ecl

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2019.12.11-23:58:25

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