2022MNRAS.509..550J

Query : 2022MNRAS.509..550J

2022MNRAS.509..550J - Mon. Not. R. Astron. Soc., 509, 550-558 (2022/January-1)

Early-type galaxies with recent star formation have low metallicities - evidence for star formation triggered by external processes?

JEONG H., OH K., JOO S.-J. and YI S.K.

Abstract (from CDS):

On the basis of the Galaxy Evolution Explore (GALEX) ultraviolet (UV) data, many studies have demonstrated that recent star formation (RSF) is common in early-type galaxies. In particular, near-ultraviolet (NUV) light is used to investigate star formation activity in early-type galaxies, owing to its high sensitivity to the presence of young stars. This study characterized the stellar population properties of luminous early-type galaxies (Mr <= -20.65 mag) in the redshift range 0.005 <= z <= 0.09 on the basis of the Sloan Digital Sky Survey (SDSS) data. Initially, the most frequently used criterion of NUV - r <= 5.4 was applied to identify early-type galaxies with RSF, and 19 per cent (172/913) of the sample galaxies met this criterion, in agreement with previous studies. A more robust sample of galaxies with RSF along with a stricter criterion (70 galaxies with NUV - r <= 5.0) were then used for further analysis, and consequently 7.7 per cent (70/913; lower limit of the RSF fraction) of the sample galaxies were classified as early-type galaxies with RSF. These galaxies tended to exhibit higher H β absorption-line strengths and stronger emission lines than quiescent (QST, NUV - r > 5.4) early-type galaxies. The most prominent feature of early-type galaxies with RSF identified in this study was that they were more metal-poor than QST galaxies owing to metal-poor stellar populations that were possibly formed from materials accreted from gas-rich satellites during (minor) mergers or interactions. The results strongly indicate that the observed RSF in the sample galaxies at the present epoch is mainly driven by external processes (i.e. mergers or interactions).

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: stellar content

VizieR on-line data: <Available at CDS (J/MNRAS/509/550): table2.dat>

Simbad objects: 73

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Number of rows : 73
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LEDA 981807 G 00 10 14.22763 -10 08 45.5335           ~ 2 0
2 LEDA 172193 G 00 29 01.4817907296 +00 21 02.907195480           ~ 13 0
3 LEDA 1482301 GiC 01 11 50.1401510136 +15 21 02.736089064           ~ 10 0
4 SDSS J011601.81-105131.4 G 01 16 01.81410 -10 51 31.4327           ~ 1 0
5 NVSS J011725-003517 rG 01 17 25.7975694192 -00 35 27.691525968   17.12   15.67   ~ 12 0
6 6dFGS gJ011853.0-003935 EmG 01 18 52.9994472264 -00 39 35.441811324   16.58   15.26   ~ 23 0
7 6dFGS gJ012056.5-000620 AGN 01 20 56.4569863200 -00 06 20.153067012   16.78   15.56   ~ 14 0
8 LEDA 1006832 Sy2 02 16 54.2650777704 -08 11 59.562075984   17.15   15.78   ~ 7 0
9 LEDA 1125121 BLL 02 31 40.9772039016 -01 10 03.672237000   18.64 18.00 16.39   ~ 19 0
10 Z 118-20 G 07 54 20.5998804528 +25 51 33.288477012   15.6       ~ 20 0
11 SDSS J075455.10+255643.6 G 07 54 55.10402 +25 56 43.6458           ~ 2 0
12 Z 149-58 AGN 08 36 01.5124689048 +30 15 59.075781624   15.10       ~ 37 0
13 Z 32-45 G 08 38 43.5284144424 +07 48 23.797431540   14.8       ~ 22 0
14 Z 263-76 Sy2 08 43 17.2128064224 +52 45 28.563127668   15.6       ~ 36 0
15 LEDA 1418578 QSO 08 54 28.1154421656 +12 54 22.147991568           ~ 5 0
16 3XMM J085938.3+565244 LIN 08 59 38.5082298840 +56 52 44.033680524           ~ 22 0
17 LEDA 3091978 G 09 01 41.4793888728 +04 57 26.191341324           ~ 6 0
18 SDSS J090401.45+523832.3 G 09 04 01.4520246408 +52 38 32.351669232           ~ 2 0
19 SDSS J090434.61+053529.1 G 09 04 34.61286 +05 35 29.1744           ~ 2 0
20 Z 61-58 LIN 09 04 50.1617541696 +13 33 42.856407864   14.8       ~ 32 0
21 2MASX J09411097+0306559 LIN 09 41 11.0047139448 +03 06 55.693461816           ~ 5 0
22 ACO 851 ClG 09 43 01.2 +46 59 54   18.9       ~ 334 0
23 NVSS J094323+054626 rG 09 43 23.8122274896 +05 46 26.102297136           ~ 18 0
24 2MASX J09551004+0648306 EmG 09 55 10.0091426040 +06 48 30.380956812           ~ 10 0
25 NVSS J100153-000729 rG 10 01 52.9508004144 -00 07 30.521949384   16.18       ~ 29 0
26 NVSS J101537+003133 rG 10 15 37.5905671824 +00 31 31.056676680   16.079   14.940   ~ 14 0
27 LEDA 1219617 G 10 21 53.1427792272 +02 12 40.490885088   16.806   15.501   ~ 10 0
28 SDSS J103521.34+024820.1 EmG 10 35 21.3328760976 +02 48 19.929053916           ~ 4 0
29 NVSS J105300+020815 rG 10 53 00.0397898232 +02 08 15.961372980   17.024   15.680   ~ 7 0
30 LEDA 2689847 G 11 51 46.0085624808 +66 40 37.250631264           ~ 5 0
31 LEDA 1117990 G 11 53 55.3910906616 -01 28 00.027727176   17.137   15.936   ~ 9 0
32 LEDA 2689902 G 11 56 35.19717 +66 40 54.9513           ~ 3 0
33 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
34 NGC 4550 GiP 12 35 30.5913588048 +12 13 14.921166792 12.97 12.56 11.68     ~ 558 1
35 Z 43-56 BLL 12 53 47.0056993512 +03 26 30.430058748   17.20 16.39     ~ 91 1
36 2MASX J13424030+0253560 EmG 13 42 40.2801712488 +02 53 56.020263720           ~ 7 0
37 2dFGRS TGN205Z174 LIN 14 11 00.0755397504 -02 38 14.582430276   17.201   15.772   ~ 8 0
38 2MASX J14132439+0623049 LIN 14 13 24.4017450072 +06 23 04.622168868           ~ 14 0
39 LEDA 1143465 G 14 16 19.5634672272 -00 25 51.733920000   17.442   16.180   ~ 8 0
40 2MASX J14173150+0046178 LIN 14 17 31.4770108656 +00 46 17.914197720           ~ 14 0
41 2MASX J14242791-0149240 LIN 14 24 27.9346055280 -01 49 23.762791236   16.738   15.423   ~ 13 0
42 Z 47-67 LIN 14 29 55.3798717920 +07 15 12.842380044   15.5       ~ 24 0
43 SDSS J143042.92+040819.3 G 14 30 42.92850 +04 08 19.3888           ~ 1 0
44 SDSS J143232.72+043919.3 G 14 32 32.72947 +04 39 19.3593           ~ 2 0
45 LEDA 184747 G 14 34 42.1600389864 +00 54 49.881986352   16.878   15.785   ~ 9 0
46 LEDA 1191224 Sy1 14 42 42.6295337424 +01 19 11.140362588   17.79 17.09     ~ 33 0
47 2MASS J14533998+0255142 AGN 14 53 39.9904931976 +02 55 14.285821512           ~ 12 0
48 Z 48-65 LIN 14 54 17.8363629192 +04 17 01.979521260   14.8       ~ 23 0
49 Z 48-82 LIN 14 58 06.3892070664 +04 06 03.590370144   15.6       ~ 19 0
50 LEDA 1175987 BiC 15 09 37.8136143168 +00 48 25.294790592           ~ 8 0
51 2MASX J15115519+0538171 BiC 15 11 55.2033809664 +05 38 17.471277492           ~ 10 0
52 Z 49-147 AGN 15 22 01.8870051504 +03 45 06.300865080   15.3       ~ 22 0
53 SDSS J155703.97+085403.5 G 15 57 03.9831335784 +08 54 03.536980776           ~ 2 0
54 LEDA 2378098 G 16 17 28.7587491744 +50 37 21.292438908           ~ 11 0
55 SDSS J171038.40+343915.3 GiC 17 10 38.4026381376 +34 39 15.341617404           ~ 4 0
56 LEDA 2631292 G 17 15 17.6679423360 +62 08 24.407054700           ~ 6 0
57 Z 300-53 rG 17 38 05.4031407096 +57 07 05.241292284   15.7       ~ 36 0
58 NVSS J204847-065945 rG 20 48 47.0727136056 -06 59 39.628709988   15.63   14.57   ~ 31 0
59 LEDA 189709 G 21 42 32.6077182840 -08 23 33.973424592   16.92   15.54   ~ 6 0
60 LEDA 1005953 G 21 44 19.97088 -08 15 56.4732           ~ 4 0
61 2MASX J21500501+0023578 EmG 21 50 05.0448935472 +00 23 57.398294868           ~ 6 0
62 LEDA 190726 EmG 21 52 13.8518519160 -07 52 36.912130464   16.79   15.36   ~ 6 0
63 2MASX J21574316-0723472 LIN 21 57 43.1733203808 -07 23 47.393877228   16.52   15.29   ~ 17 0
64 NGC 7211 G 22 06 21.8708513616 -08 05 23.914477824   14.86       ~ 23 0
65 2MASX J22234163-0840240 LIN 22 23 41.6290467312 -08 40 24.182484636           ~ 4 0
66 LEDA 1448162 EmG 22 38 17.3651700648 +14 03 32.404446900           ~ 5 0
67 2MASX J23044397-0842114 AGN 23 04 43.9816590792 -08 42 11.603475540   16.58   15.27   ~ 14 0
68 2MASX J23244884-0958102 LIN 23 24 48.8576782200 -09 58 10.364853504   16.82   15.48   ~ 7 0
69 LEDA 3093282 G 23 35 29.0676423384 -09 12 22.787297064           ~ 2 0
70 Z 455-64 LIN 23 53 08.2852044984 +16 03 51.871191660   15.7       ~ 14 0
71 Z 382-1 G 23 55 51.9783404136 +00 33 28.460850444   15.7       ~ 24 0
72 NPM1G +00.0654 rG 23 57 48.5771032909 +00 47 44.077693009           ~ 18 0
73 LEDA 978183 G 23 59 46.3264958688 -10 26 29.829615648           ~ 3 0

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