1999A&A...345..419L

Query : 1999A&A...345..419L

1999A&A...345..419L - Astronomy and Astrophysics, volume 345, 419-429 (1999/5-2)

Star formation history of early-type galaxies in low density environments. V. Blue line-strength indices for the nuclear region.

LONGHETTI M., BRESSAN A., CHIOSI C. and RAMPAZZO R.

Abstract (from CDS):

We analyze the star formation properties of a sample of 21 shell galaxies and 30 early-type galaxies members of interacting pairs, located in low density environments (Longhetti et al. 1998a, 1998b). The study is based on new models developed to interpret the information coming from `blue' Hδ/FeI, H+K(CaII) and Δ4000line-strength indices proposed by Rose (1984AJ.....89.1238R; 1985AJ.....90.1927R) and Hamilton (1985ApJ...297..371H). We find that the last star forming event that occurred in the nuclear region of shell galaxies is statistically old (from 0.1 up to several Gyr) with respect to the corresponding one in the sub-sample of pair galaxies (<0.1 Gyr or even ongoing star formation). If the stellar activity is somehow related to the formation of shells, as predicted by several dynamical models of galaxy interaction, shells have to be considered long lasting structures. Since pair members show evidence of very recent star formation, we suggest that either large reservoirs of gas have to be present to maintain active star formation, if these galaxies are on periodic orbits, or most of the pair members in the present sample are experiencing unbound encounters.

Abstract Copyright: ∼

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

VizieR on-line data: <Available at CDS (J/A+A/345/419): table2.dat>

CDS comments: T.4 : RNNNa = RR95 NNNa

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 MCG-07-03-014 Sy1 01 18 08.370 -44 27 43.29   14.43   13.06   ~ 79 0
2 NGC 813 G 02 01 36.0277230504 -68 26 21.178164084   13.84   12.39   ~ 28 0
3 NGC 1210 Sy2 03 06 45.3516825024 -25 42 58.855024728   13.70   12.54   ~ 43 0
4 NGC 1316 BL? 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1387 1
5 NGC 1549 GiP 04 15 45.223 -55 35 32.50 11.22 10.48 9.79 9.08   ~ 240 1
6 NGC 1553 GiP 04 16 10.4697802536 -55 46 48.072797400 10.76 10.10 9.40 8.74   ~ 377 2
7 NGC 1570 GiG 04 22 08.9328223584 -43 37 46.451648820   13.22   11.65   ~ 43 0
8 ESO 486-19 EmG 05 03 13.1592264360 -22 49 58.925724240   13.62   12.20   ~ 33 0
9 NGC 2276 AG? 07 27 14.485 +85 45 16.20   12.3       ~ 376 0
10 NGC 2300 AG? 07 32 20.486 +85 42 31.90   12.2       ~ 335 0
11 NGC 2865 GiG 09 23 30.205 -23 09 41.37   12.39 11.43 11.06   ~ 240 0
12 NGC 2945 Sy2 09 37 41.1530336544 -22 02 05.995640832   13.23   11.58   ~ 46 0
13 NGC 3289 GiG 10 34 07.4195648472 -35 19 24.030465024   13.68 14.13 12.35   ~ 41 0
14 NGC 4105 Sy2 12 06 40.767 -29 45 36.64   11.35 12.52 9.53   ~ 127 0
15 NGC 4106 GiP 12 06 45.5905 -29 46 06.190   11.61 11.35     ~ 73 0
16 ESO 507-45 Sy1 12 55 35.6914004112 -26 49 30.158962932   12.84   11.28 12.35 ~ 49 0
17 ESO 507-46 GiP 12 55 44.1064176624 -26 48 33.963737328   13.96   12.64   ~ 36 0
18 NGC 5018 GiP 13 13 01.0452720960 -19 31 05.649751992   11.71   10.31   ~ 313 1
19 ESO 386-4 AG? 14 40 29.1376680240 -35 07 24.180907296   13.74   12.07   ~ 28 0
20 IC 4823 IG 19 12 14.6 -63 58 47   14.68 16.3 13.05   ~ 10 0
21 NGC 6776 AG? 19 25 19.1485272024 -63 51 36.633840408   13.19 11.99 11.59   ~ 87 0
22 NGC 6849 AG? 20 06 15.6180340992 -40 11 53.765406996   12.90       ~ 69 0
23 IC 5013 EmG 20 28 33.7908233784 -36 01 37.675012692   12.67   11.12   ~ 50 0
24 ESO 400-30 EmG 20 28 34.9506792936 -36 02 35.430832968   13.47   12.95   ~ 34 0
25 NGC 6958 AG? 20 48 42.6064604520 -37 59 50.876997504 12.79 12.27 11.42 10.83   ~ 156 1
26 ESO 107-4 EmG 21 03 29.6532884904 -67 10 52.611761748   12.98 11.87 11.63   ~ 65 0
27 IC 5105 EmG 21 24 22.0100945880 -40 32 15.814424724   12.43 11.54 10.90   ~ 73 0
28 NGC 7135 Sy1 21 49 46.0013389728 -34 52 34.575955536   12.25 13.30 10.84   ~ 91 0
29 ESO 289-15 G 22 18 07.5770892672 -42 41 21.798461004   15.06   13.92   ~ 24 0
30 NGC 7284 EmG 22 28 35.9222830920 -24 50 39.077854512   12.96   11.59   ~ 47 0
31 IC 5250A GiP 22 47 17.50 -65 03 35.0   12.10   10.50   ~ 27 0
32 IC 5250B GiP 22 47 22.1377595904 -65 03 30.691686492   12.20   10.59   ~ 28 0
33 ESO 291-28 GiP 23 33 13.82 -45 01 26.1   14.69   13.43   ~ 13 0
34 ESO 240-10 Sy1 23 37 44.4046340640 -47 30 22.668150492   12.49   11.15   ~ 56 0
35 IC 5358 BiC 23 47 45.1086508608 -28 08 26.650470372   13.42 14.72 11.99   ~ 86 1
36 2MASX J23474714-2808059 GiP 23 47 47.1859886280 -28 08 05.928820944   13.46   12.12   ~ 29 0

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