2002A&A...384...33B

Query : 2002A&A...384...33B

2002A&A...384...33B - Astronomy and Astrophysics, volume 38433-47 (2002/3-2)

Molecular gas in normal late-type galaxies.

BOSELLI A., LEQUEUX J. and GAVAZZI G.

Abstract (from CDS):

We present 12CO(J=1-0) line observations of 22 low-luminosity spiral galaxies in the Virgo cluster. These data, together with 244 others available in the literature, allow us to build a large sample that we use to study the molecular gas properties of galaxies spanning a large range of morphological types and luminosities and belonging to different environments (clusters - field). The molecular gas content of the target galaxies is estimated using a luminosity-dependent X=N(H2)/I(CO) conversion factor that has been calibrated on a sample of nearby galaxies. X spans from ∼1020mol/cm2/(K.km/s) in giant spirals to ∼1021mol/cm2/(K.km/s) in dwarf irregulars. The value of the X conversion factor is found consistent with a value derived independently from dust masses estimated from FIR fluxes, with a metallicity-dependent dust to gas ratio. The relationships between X and the UV radiation field (as traced by the Hα+[NII]EW), the metallicity and the H band luminosity are analysed. We show that the molecular gas contained in molecular clouds or complexes is of the order of 15% of the total gas on average whatever the luminosity or the Hubble type of the galaxies. We discuss the relation between the star formation rate and the molecular gas content and estimate the average star formation efficiency of late-type galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: general, spiral - ISM - galaxies: intergalactic medium - radio lines: galaxies

Simbad objects: 44

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Number of rows : 44
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
5 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1741 2
6 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
9 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
10 NAME Coma Supercluster SCG 11 23 +23.9           ~ 291 0
11 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1127 1
12 NAME NGC 4168 Group GrG 12 12.0 +13 24           ~ 69 0
13 IC 769 GiG 12 12 32.3204996040 +12 07 25.674097152   14.1       ~ 153 0
14 Z 98-106 LSB 12 13 41.159 +15 27 12.89   15.5       ~ 60 0
15 M 98 LIN 12 13 48.2910686976 +14 54 01.953475200 11.25 10.95 10.14     ~ 499 2
16 NGC 4193 AGN 12 13 53.588 +13 10 22.46   13.18 12.31     ~ 175 1
17 NGC 4224 GiG 12 16 33.7856435496 +07 27 43.527631068   13.3       ~ 167 0
18 IC 776 EmG 12 19 03.119 +08 51 22.15   14.9       ~ 154 0
19 Z 99-22 bCG 12 21 11.2540900032 +17 38 19.505228028   14.9       ~ 78 0
20 NGC 4380 BLL 12 25 22.178 +10 01 00.14   13.4       ~ 275 0
21 NGC 4405 H2G 12 26 07.1372151528 +16 10 51.581577504   13.03       ~ 169 1
22 NGC 4411B Sy2 12 26 47.2270744440 +08 53 04.479254880   14.4       ~ 190 0
23 NGC 4420 GiG 12 26 58.4368542672 +02 29 39.725748780   12.7       ~ 190 0
24 NGC 4470 H2G 12 29 37.8066943368 +07 49 27.284422224   12.9       ~ 257 0
25 NGC 4480 GiG 12 30 26.7893754432 +04 14 47.674860000   13.4       ~ 161 0
26 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
27 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
28 NGC 4496 GiP 12 31 39.2222392512 +03 56 21.641352828   11.71       ~ 376 0
29 NGC 4503 GiP 12 32 06.2324986032 +11 10 34.960071396 12.66 12.05 11.07     ~ 225 1
30 NGC 4519 GiG 12 33 30.278 +08 39 16.06   12.8       ~ 295 0
31 NAME Vir B Cluster GrG 12 33 39.3 +10 10 57           ~ 143 0
32 NGC 4532 H2G 12 34 19.329 +06 28 03.73   12.3       ~ 304 2
33 NGC 4565 Sy2 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 991 0
34 IC 3583 GiG 12 36 43.558 +13 15 32.93   13.31       ~ 189 1
35 NGC 4633 GiP 12 42 37.3727566944 +14 21 25.949234160   14.7       ~ 147 0
36 NGC 4639 Sy1 12 42 52.3785000336 +13 15 26.706153600   13.62 12.72     ~ 642 0
37 IC 3742 GiG 12 45 31.234 +13 19 44.59   14.6       ~ 115 0
38 NGC 4866 LIN 12 59 27.0952921176 +14 10 16.382228232   11.9       ~ 220 0
39 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
40 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
41 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
42 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2661 2
43 NAME Virgo Wb Cloud GrG ~ ~           ~ 5 0
44 NAME Virgo Wa Cloud GrG ~ ~           ~ 5 0

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