2007MNRAS.381..245R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST18:32:58

2007MNRAS.381..245R - Mon. Not. R. Astron. Soc., 381, 245-262 (2007/October-2)

The Galaxy Evolution Explorer UV emission in shell galaxies: tracing galaxy `rejuvenation' episodes.

RAMPAZZO R., MARINO A., TANTALO R., BETTONI D., BUSON L.M., CHIOSI C., GALLETTA G., GRUETZBAUCH R. and RICH R.M.

Abstract (from CDS):

We present the Galaxy Evolution Explorer (GALEX) far-ultraviolet (FUV) and near-ultraviolet (NUV) imaging of three nearby shell galaxies, namely NGC 2865, NGC 5018 and NGC 7135 located in low-density environments.

The system of shells and fine structures visible in the optical is detected in the NUV image of NGC 2865 and in both NUV and FUV images of NGC 7135. The NUV image of NGC 5018 does not present shell structures. We detect absorption features in the nuclear region of all three galaxies. NGC 2865 has a nearly flat colour profile with (FUV-NUV) ~ 2 throughout the whole galaxy. NGC 7135 is blue in the centre (FUV-NUV) ~ 0 and as red as (FUV-NUV) ~ 1.5 in the outskirts, including the faint shell-like feature.

The three shell galaxies are members of poor groups of galaxies. We compare GALEX NUV observations with available Hi large-scale measurements, and determine the UV magnitudes of likely companions. Most of the known (and possible) companions are gas-rich late-type galaxies, suggesting that our shell galaxies inhabit the ideal environment for hosting rejuvenating episodes driven by accretion events.

We investigate the ability of the nuclear GALEX (FUV-NUV) colour to provide information about rejuvenation phenomena in the stellar populations of the shell galaxies. To this aim, we derive from theory the relationship between the Mg2, Hβ, HγA, HδA Lick line-strength indices and the (FUV-NUV) colour. We extend the study to a sample of early-type galaxies in low-density environments which includes shell galaxies and/or galaxies with emission lines in their optical spectra. In the index versus (FUV-NUV) colour diagrams, most of the galaxies are well explained by passively evolving single stellar populations. On the average, ages and metallicities of the galaxies in our sample estimated from optical line-strength indices are consistent with those inferred from the (FUV-NUV) colour. We note that the GALEX (FUV-NUV) and (UV-V) colours have different response to age and metallicity. In general, all the colours but for (FUV-NUV) and (FUV-V), become nearly age-insensitive when 1-2 Gyr have elapsed from the last star-forming event. Finally, considering composite stellar population models with a recent burst of star formation, we suggest that the positions of the NGC 7135 and NGC 2865 nuclei in the (FUV-NUV)-Hβ plane could be explained in terms of a recent rejuvenation episode.


Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: fundamental parameters - galaxies: interactions

Nomenclature: Fig.2, Text 4.1: [RMT2007] JHHMMSS.s+DDMMSS.s N=5.

Simbad objects: 39

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Number of rows : 39

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 NGC 470 GiP 01 19 44.845 +03 24 35.90 12.63 12.53 11.78     ~ 247 1
2 NGC 474 GiP 01 20 06.696 +03 24 54.97 12.75 12.37 11.51 11.42 10.56 ~ 319 1
3 NGC 777 Sy2 02 00 14.934 +31 25 45.78 13.09 12.49 11.45     ~ 158 2
4 NGC 1052 GiP 02 41 04.79851 -08 15 20.7517 11.84 11.41 10.47 10.71   ~ 1155 2
5 NGC 1380 GiP 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 381 1
6 NGC 1389 GiP 03 37 11.7424496792 -35 44 45.871664087 12.80 12.39 11.50 10.99   ~ 175 1
7 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 531 1
8 NGC 1426 GiG 03 42 49.0995354501 -22 06 30.172682100   12.21 11.44 10.90   ~ 185 0
9 NGC 1453 GiG 03 46 27.269 -03 58 07.55   13   11.30   ~ 155 0
10 NGC 1521 GiG 04 08 18.937 -21 03 06.98   12.31   10.73   ~ 105 0
11 NGC 1553 GiP 04 16 10.4711638537 -55 46 48.107262747 10.76 10.10 9.40 8.74   ~ 356 2
12 PN A66 21 PN 07 29 02.7094421237 +13 14 48.589321539   15.67 15.99     DOZ 180 0
13 2MASX J09232585-2308093 G 09 23 25.84 -23 08 09.5           ~ 2 0
14 2MASS J09232999-2311413 G 09 23 30.00 -23 11 41.3           ~ 1 0
15 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 226 0
16 [RMT2007] J092333.4-231020.2 G 09 23 33.40 -23 10 20.2           ~ 1 0
17 [RMT2007] J092334.2-231024.9 G 09 23 34.20 -23 10 24.9           ~ 1 0
18 [RMT2007] J092335.1-231020.1 G 09 23 35.10 -23 10 20.1           ~ 1 0
19 [RMT2007] J092335.7-231011.7 G 09 23 35.70 -23 10 11.7           ~ 1 0
20 [RMT2007] J092336.7-231011.3 G 09 23 36.70 -23 10 11.3           ~ 1 0
21 LEDA 92253 G 09 23 40.8 -23 14 46           ~ 11 0
22 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 414 2
23 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1645 2
24 M 89 LIN 12 35 39.8073444 +12 33 22.830809 11.29 10.73 9.75     ~ 931 2
25 ESO 576-8 GiP 13 12 18.904 -19 26 45.79   14.93   13.84   ~ 27 0
26 LEDA 140148 G 13 12 47.8 -19 22 18           ~ 5 0
27 NGC 5018 GiP 13 13 01.000 -19 31 05.87   11.71   10.31   ~ 287 1
28 NGC 5022 GiP 13 13 30.8019818712 -19 32 47.864229512   13.72   12.33   ~ 81 1
29 LEDA 140150 G 13 13 54.3 -19 24 57           ~ 5 0
30 NGC 5638 GiP 14 29 40.389 +03 14 00.39 12.57 12.14 11.20     ~ 229 2
31 NGC 5813 LIN 15 01 11.265 +01 42 07.09 12.00 11.45 10.46 10.06   ~ 585 1
32 NGC 6958 G 20 48 42.6063609433 -37 59 50.877744163 12.79 12.27 11.42 10.83   ~ 144 1
33 ESO 403-33 G 21 48 52.5 -34 56 50   16.11   15.06   ~ 5 0
34 6dFGS gJ214915.0-345301 G 21 49 14.93 -34 53 01.5   16.09       ~ 4 0
35 NGC 7135 AGN 21 49 45.9999195577 -34 52 34.589482636   12.25 13.30 10.84   ~ 81 0
36 IC 1459 GiP 22 57 10.60677155 -36 27 43.9953697   10.96 11.85 9.34 10.3 ~ 578 2
37 NAME Virgo Extension GrG ~ ~           ~ 45 0
38 NAME ANT-HYA SUPERCL SCG ~ ~           ~ 6 0
39 NAME Psc-Aus Spur ~ ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-18:32:58

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