2004A&A...421..887I


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.02CEST04:43:38

2004A&A...421..887I - Astronomy and Astrophysics, volume 421, 887-897 (2004/7-3)

Tracing the star formation history of cluster galaxies using the Hα/UV flux ratio.

IGLESIAS-PARAMO J., BOSELLI A., GAVAZZI G. and ZACCARDO A.

Abstract (from CDS):

Since the Hα and UV fluxes from galaxies are sensitive to stellar populations of ages <107 and ≃108yr respectively, their ratio f(Hα)/f(UV) provides us with a tool to study the recent t≤108yr star formation history of galaxies, an exercise that we present here applied to 98 galaxies in 4 nearby clusters (Virgo, Coma, Abell 1367 and Cancer). The observed f(Hα)/f(UV) ratio is ∼ a factor of two smaller than the expected one as determined from population synthesis models assuming a realistic delayed, exponentially declining star formation history. We discuss various mechanisms that may have affected the observed f(Hα)/f(UV) ratio and we propose that the above discrepancy arises from either the absorption of Lyman continuum photons by dust within the star formation regions or from the occurrence of star formation episodes. After splitting our sample into different subsamples according to evolutionary criteria we find that our reference sample of galaxies unaffected by the cluster environment show an average value of f(Hα)/f(UV) two times lower than the expected one. We argue that this difference must be mostly due to absorption of ≃45% of the Lyman continuum photons within star forming regions. Galaxies with clear signs of an ongoing interaction show average values of f(Hα)/f(UV) slightly higher than the reference value, as expected if those objects had SFR increased by a factor of ≃4. The accuracy of the current UV and Hα photometry is not yet sufficient to clearly disentangle the effect of interactions on the f(Hα)/f(UV) ratio, but significant observational improvements are shortly expected to result from the GALEX mission.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: clusters: general

Status at CDS:  

Simbad objects: 87

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Number of rows : 87

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 UGC 4308 AGN 08 17 25.776 +21 41 08.06   14.5       ~ 87 0
2 UGC 4324 GiG 08 18 29.5552893125 +20 45 40.902810214   15.3       ~ 62 0
3 2MASX J08184909+2113053 GiG 08 18 49.100 +21 13 05.35   15.5       ~ 38 0
4 UGC 4329 LSB 08 19 01.8842047608 +21 11 09.015839671   15.0       ~ 86 0
5 NVSS J081904+214730 rG 08 19 05.0924503501 +21 47 29.056119837   15.2       ~ 46 0
6 2MASX J08191980+2103315 GiG 08 19 19.808 +21 03 31.54   15.5       ~ 60 0
7 IC 2293 GiG 08 19 32.1130216817 +21 23 39.505540106   15.2       ~ 31 0
8 2MASX J08195880+2103581 GiG 08 19 58.804 +21 03 58.15   15.7       ~ 43 0
9 NAME Cancer Cluster ClG 08 20 54 +21 04.5           ~ 151 0
10 NGC 2570 GiC 08 21 22.520 +20 54 37.53   15.4       ~ 44 0
11 IC 2348 Sy2 08 24 20.2492518066 +20 31 59.700973961   15.6       ~ 36 0
12 2MASX J11421476+1958350 GiG 11 42 14.766 +19 58 35.07   15.5   14.67   ~ 66 0
13 NVSS J114224+200711 rG 11 42 24.481 +20 07 10.10 14.59 14.55 13.84 13.53   ~ 115 1
14 LEDA 36382 GiC 11 42 56.450 +19 57 58.37 15.85 16.25   15.27   ~ 88 0
15 2MFGC 9193 GiC 11 43 13.096 +20 00 17.52 15.91 16.52   15.56   ~ 92 0
16 UGC 6697 GiG 11 43 49.078 +19 58 06.46 13.96 14.35 13.59 13.29   ~ 197 2
17 NGC 3840 H2G 11 43 58.9643701127 +20 04 37.306253441 14.87 14.89 13.84 13.58   ~ 107 1
18 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 988 1
19 NGC 3860 AGN 11 44 49.1689905748 +19 47 42.142765911 14.81 14.61   13.12   ~ 102 0
20 2MASX J11454884+2037428 GiG 11 45 48.8364106912 +20 37 42.955494007   15.5   14.50   ~ 63 0
21 NGC 4152 AGN 12 10 37.511 +16 01 58.56   14.00 13.35     ~ 213 0
22 NGC 4178 H2G 12 12 46.443 +10 51 57.59   12.9       ~ 316 0
23 NGC 4189 GiG 12 13 47.278 +13 25 29.45   12.51 11.74     ~ 246 1
24 M 98 LIN 12 13 48.292 +14 54 01.69 11.25 10.95 10.14     ~ 441 1
25 IC 3061 GiG 12 15 04.519 +14 01 44.31   14.9       ~ 130 0
26 NGC 4212 H2G 12 15 39.3406580208 +13 54 05.424965126   11.9       ~ 285 0
27 NGC 4234 GiG 12 17 09.147 +03 40 59.24   13.4       ~ 102 0
28 M 99 H2G 12 18 49.625 +14 24 59.36 10.45 10.44 9.87     ~ 759 2
29 IC 776 EmG 12 19 03.119 +08 51 22.15   14.9       ~ 121 0
30 NGC 4273 GiP 12 19 56.063 +05 20 36.12   12.3       ~ 239 0
31 Z 99-22 bCG 12 21 11.2538430522 +17 38 19.506504841   14.9       ~ 62 0
32 NGC 4299 GiP 12 21 40.548 +11 29 59.74   12.8       ~ 220 0
33 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 866 2
34 NGC 4301 GiG 12 22 27.246 +04 33 58.69   13.40 12.99     ~ 105 1
35 IC 3258 GiC 12 23 44.495 +12 28 42.06   14.3       ~ 137 0
36 IC 3259 GiP 12 23 48.497 +07 11 07.17   14.7       ~ 99 0
37 NGC 4351 GiG 12 24 01.560 +12 12 18.09   13.5       ~ 191 0
38 IC 3268 GiG 12 24 07.430 +06 36 26.89   14.2       ~ 92 0
39 NGC 4376 GiG 12 25 18.0159702260 +05 44 28.132402987   13.9       ~ 103 0
40 NGC 4383 AGN 12 25 25.518 +16 28 12.02 12.41 12.67 12.12     ~ 222 1
41 UGC 7513 GiG 12 25 42.634 +07 13 00.15   14.4       ~ 159 0
42 NGC 4388 Sy2 12 25 46.820 +12 39 43.45 11.91 11.76 11.02     ~ 1178 2
43 NGC 4390 GiG 12 25 50.6657848750 +10 27 32.514691259   13.7       ~ 138 0
44 IC 3322 GiG 12 25 54.122 +07 33 17.36   14.7       ~ 111 0
45 NGC 4396 GiG 12 25 58.802 +15 40 17.28 12.94 13.06 12.58     ~ 153 1
46 NGC 4402 GiP 12 26 07.566 +13 06 46.06   12.55       ~ 353 1
47 NGC 4411 GiP 12 26 29.859 +08 52 20.08   14.4       ~ 116 0
48 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5794 0
49 NGC 4413 GiP 12 26 32.2322973950 +12 36 38.412408309   13.6 12.25     ~ 207 1
50 NGC 4412 Sy2 12 26 36.0838908611 +03 57 52.923602148   13.2       ~ 125 0
51 NGC 4416 GiG 12 26 46.720 +07 55 07.80   13.15 11.57     ~ 147 0
52 UGC 7546 GiP 12 26 47.2273544883 +08 53 04.461237649   14.4       ~ 158 0
53 NGC 4420 GiG 12 26 58.4363204381 +02 29 39.738715668   12.7       ~ 156 0
54 NGC 4423 GiG 12 27 08.972 +05 52 48.81   14.4       ~ 115 0
55 IC 3365 G 12 27 11.356 +15 53 47.29   14.36       ~ 86 1
56 NGC 4424 H2G 12 27 11.5747046042 +09 25 14.319813630   13.1       ~ 283 0
57 NGC 4430 GiP 12 27 26.4014958744 +06 15 45.975179068   13.4       ~ 140 0
58 UGC 7590 GiG 12 28 18.772 +08 43 46.08   15.0       ~ 93 0
59 NGC 4451 GiG 12 28 40.558 +09 15 32.13   13.4       ~ 170 0
60 IC 3414 GiG 12 29 28.7707880441 +06 46 18.549648514   14.2       ~ 99 0
61 NGC 4466 GiG 12 29 30.569 +07 41 47.13   14.7       ~ 66 0
62 NGC 4470 H2G 12 29 37.8070254595 +07 49 27.286182613   12.9       ~ 198 0
63 NGC 4480 GiG 12 30 26.781 +04 14 47.30   13.4       ~ 128 0
64 NGC 4498 GiP 12 31 39.5598460639 +16 51 09.626835314   12.8       ~ 203 0
65 IC 797 GiG 12 31 54.752 +15 07 26.11   13.9       ~ 122 0
66 M 88 Sy2 12 31 59.216 +14 25 13.48   14.33 13.18     ~ 725 1
67 IC 3476 GiG 12 32 41.744 +14 03 05.81   13.5       ~ 163 0
68 NGC 4519 GiG 12 33 30.278 +08 39 16.06   12.8       ~ 248 0
69 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 325 0
70 IC 800 LSB 12 33 56.715 +15 21 16.35   14.3       ~ 119 0
71 NGC 4532 GiP 12 34 19.329 +06 28 03.73   12.3       ~ 246 2
72 IC 3521 GiG 12 34 39.5150055918 +07 09 36.686838198   14.2       ~ 123 0
73 NGC 4540 GiG 12 34 50.8741511959 +15 33 06.114651691   12.5       ~ 164 1
74 IC 3576 AGN 12 36 37.675 +06 37 15.19   15.90 15.40     ~ 103 1
75 IC 3591 bCG 12 37 02.697 +06 55 33.26   14.6       ~ 114 1
76 MCG+02-32-161 GiG 12 37 41.518 +08 33 31.20   15.1       ~ 100 0
77 NGC 4595 GiG 12 39 51.9129989652 +15 17 51.960292929   12.8       ~ 180 0
78 NGC 4633 GiP 12 42 37.3727319515 +14 21 25.949040117   14.7       ~ 118 0
79 NGC 4639 GiP 12 42 52.3781396179 +13 15 26.712929286   13.62 12.72     ~ 554 0
80 NGC 4647 H2G 12 43 32.542 +11 34 56.89   12.5 12.5     ~ 376 0
81 NGC 4651 LIN 12 43 42.627 +16 23 36.23   11.30 10.92 10.42 9.84 ~ 460 0
82 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 499 1
83 NGC 4689 H2G 12 47 45.5568267764 +13 45 46.148221803   12.8       ~ 330 0
84 NGC 4701 GiG 12 49 11.5932901313 +03 23 19.390550167   13.1       ~ 144 0
85 NGC 4808 GiG 12 55 48.940 +04 18 14.74   12.5       ~ 196 0
86 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4187 2
87 NGC 4900 EmG 13 00 39.1189337687 +02 30 05.164657273   12.8       ~ 224 0

    Equat.    Gal    SGal    Ecl

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2020.06.02-04:43:38

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