2011ApJ...736..154M

Query : 2011ApJ...736..154M

2011ApJ...736..154M - Astrophys. J., 736, 154 (2011/August-1)

Tracing rejuvenation events in nearby S0 galaxies.

MARINO A., BIANCHI L., RAMPAZZO R., THILKER D.A., ANNIBALI F., BRESSAN A. and BUSON L.M.

Abstract (from CDS):

With the aim of characterizing rejuvenation processes in early-type galaxies, we analyzed five barred S0 galaxies showing a prominent outer ring in ultraviolet (UV) imaging. We analyzed Galaxy Evolution Explorer far-UV (FUV) and near-UV (NUV), and optical data using stellar population models and estimated the age and the stellar mass of the entire galaxies and the UV-bright ring structures. Outer rings consist of young ( ≲ 200 Myr old) stellar populations, accounting for up to 70% of the FUV flux but containing only a few percent of the total stellar mass. Integrated photometry of the whole galaxies places four of these objects on the green valley, indicating a globally evolving nature. We suggest such galaxy evolution is likely driven by bar-induced instabilities, i.e., inner secular evolution, that conveys gas to the nucleus and the outer rings. At the same time, H I observations of NGC 1533 and NGC 2962 suggest external gas re-fueling can play a role in the rejuvenation processes of such galaxies.

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Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: structure

Simbad objects: 21

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Number of rows : 21
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 NGC 404 LIN 01 09 27.02 +35 43 05.3   12.56 11.73     ~ 511 0
2 MCG-05-07-001 Sy2 02 28 20.1024142368 -31 52 51.628774224   14.6   13.14   ~ 82 0
3 NGC 1533 EmG 04 09 51.8356041744 -56 07 06.410207352   11.77 10.92 10.27 11.0 ~ 209 0
4 NGC 1553 GiP 04 16 10.4697802536 -55 46 48.072797400 10.76 10.10 9.40 8.74   ~ 395 2
5 NAME NGC 1566 Group GrG 04 20 00.6 -54 56 17           ~ 180 0
6 NGC 2972 OpC 09 40 14.1 -50 19 36   10.72 9.9     ~ 65 0
7 LGG 178 GrG 09 40 30.8 +05 00 51           ~ 3 0
8 NGC 2962 GiP 09 40 53.9321546928 +05 09 57.032828496   13.1       ~ 210 0
9 LEDA 1277283 AG? 09 40 56.429 +05 02 43.23           ~ 15 0
10 NGC 2974 Sy2 09 42 33.2918467632 -03 41 57.038311068   12.19   10.77   ~ 463 0
11 LGG 179 GrG 09 42 45 -04 20.0           ~ 4 0
12 NGC 3489 GiG 11 00 18.5483994744 +13 54 04.206202668 11.46 11.12 10.29     ~ 429 1
13 NGC 4245 GiG 12 17 36.7836585312 +29 36 28.898544204   12.4       ~ 192 0
14 USGC U478 GrG 12 17 50.6 +29 50 08           ~ 4 0
15 NGC 4262 GiG 12 19 30.5694336288 +14 52 39.517143276 13.00 12.49 11.55     ~ 378 1
16 NGC 4570 GiG 12 36 53.3828233728 +07 14 47.697174852   11.8       ~ 342 0
17 NGC 5363 rG 13 56 07.24367 +05 15 16.9200 12.59 12.12 10.51     ~ 235 1
18 NGC 5636 GiP 14 29 39.0108829368 +03 15 58.704040548   13.70       ~ 71 1
19 NGC 5638 GiP 14 29 40.3717451400 +03 13 59.987811648 12.57 12.14 11.20     ~ 252 2
20 LGG 386 GrG 14 39 38.0 +02 07 50           ~ 8 0
21 NGC 7000 Cl* 20 58 47 +44 19.8           ~ 427 0

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