2005A&A...438..855I


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET23:28:33

2005A&A...438..855I - Astronomy and Astrophysics, volume 438, 855-866 (2005/8-2)

Molecular gas in compact galaxies.

ISRAEL F.P.

Abstract (from CDS):

New observations of eleven compact galaxies in the 12CO J=2-1 and J=3-2 transitions are presented. From these observations and literature data accurate line ratios in matched beams have been constructed, allowing the modelling of physical parameters. Matching a single gas component to observed line ratios tends to produce physically unrealistic results, and is often not possible at all. Much better results are obtained by modelling two distinct gas components. In most observed galaxies, the molecular gas is warm (Tk=50-150K) and at least partially dense (n(H2)≥3000cm–3). Most of the gas-phase carbon in these galaxies is in atomic form; only a small fraction (∼5%) is in carbon monoxide. Beam-averaged CO column densities are low (of the order of 1016cm–2). However, molecular hydrogen column densities are high (of the order of 1022cm–2) confirming large CO-to-H2 conversion factors (typically X=1021-1022cm–2/K.km/s) found for low-metallicity environments by other methods. From CO spectroscopy, three different types of molecular environment may be distinguished in compact galaxies. Type I (high rotational and isotopic ratios) corresponds to hot and dense molecular clouds dominated by star-forming regions. Type II has lower ratios, similar to the mean found for infrared-luminous galaxies in general, and corresponds to environments engaged in, but not dominated by, star-forming activity. Type III, characterized by low 12CO (2-1)/(1-0) ratios, corresponds to mostly inactive environments of relatively low density.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - ISM: abundances - ISM: molecules - galaxies: irregular - submillimeter

CDS comments: Paragraphe 2 Haro 2 = [H56] 2

Simbad objects: 37

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Number of rows : 37

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 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 689 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 992 0
3 NGC 145 IG 00 31 45.730 -05 09 09.55   13.3   12.34 13.5 ~ 41 0
4 NGC 178 GiG 00 39 08.392 -14 10 22.25   13.6   13.4 13.1 ~ 60 0
5 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2887 2
6 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 455 0
7 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 354 0
8 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 320 1
9 NGC 1140 EmG 02 54 33.5258827369 -10 01 43.135585379 12.41 12.84 12.49 13.6 13.5 ~ 257 1
10 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1370 1
11 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1143 3
12 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 494 0
13 NGC 2537 IG 08 13 14.643 +45 59 23.25 12.18 12.50 11.69 11.66   ~ 266 1
14 ESO 495-21 bCG 08 36 15.190 -26 24 33.66 12.04 11.93 11.45 11.09 12.3 ~ 491 3
15 NGC 2730 rG 09 02 15.839 +16 50 17.51   13.7       ~ 55 0
16 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 573 1
17 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3922 5
18 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 680 0
19 Mrk 33 IG 10 32 31.956 +54 24 03.53 13.29 13.66 13.13 12.71 12.27 ~ 320 1
20 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 316 1
21 NGC 3659 LSB 11 23 45.5388040922 +17 49 06.922766890   12.7       ~ 90 0
22 IC 745 AGN 11 54 12.250 +00 08 11.68   14.59 14.19     ~ 114 1
23 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 406 2
24 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 853 1
25 NGC 4234 GiG 12 17 09.147 +03 40 59.24   13.4       ~ 100 0
26 NGC 4532 GiP 12 34 19.329 +06 28 03.73   12.3       ~ 244 2
27 IC 3521 GiG 12 34 39.5150055918 +07 09 36.686838198   14.2       ~ 121 0
28 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2187 2
29 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1254 4
30 NGC 5633 EmG 14 27 28.3609163671 +46 08 47.523613534   13.176 12.932 12.449 11.575 ~ 149 0
31 NGC 6052 IG 16 05 12.8707837896 +20 32 32.613940524 13.01 13.44 13.00     ~ 330 2
32 NGC 6570 GiG 18 11 07.295 +14 05 35.24   13.2       ~ 50 0
33 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1417 0
34 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2203 2
35 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1095 2
36 NGC 7732 GiP 23 41 33.852 +03 43 29.83   14.5       ~ 76 0
37 NAME Local Group GrG ~ ~           ~ 6798 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-23:28:34

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