1998AJ....116.2746T

Query : 1998AJ....116.2746T

1998AJ....116.2746T - Astron. J., 116, 2746-2756 (1998/December-0)

CO emission in low-luminosity, H I-rich galaxies.

TAYLOR C.L., KOBULNICKY H.A. and SKILLMAN E.D.

Abstract (from CDS):

We present 12CO 1 ⟶ 0 observations of 11 low-luminosity (M_B_ > -18), H I-rich dwarf galaxies. Only the three most metal-rich galaxies, with 12 + log (O/H) ~ 8.2, are detected. Very deep CO spectra of six extremely metal-poor systems [12 + log (O/H) ≤ 7.5] yield only low upper limits on the CO surface brightness, ICO < 0.1 K km.s–1. Three of these six have never before been observed in a CO line, while the others now have much more stringent upper limits. For the very low metallicity galaxy Leo A, we do not confirm a previously reported detection in CO, and the limits are consistent with another recent nondetection.

We combine these new observations with data from the literature to form a sample of dwarf galaxies that all have CO observations and measured oxygen abundances. No known galaxies with 12 + log (O/H) < 7.9 (Z < 0.1 Z☉) have been detected in CO. Most of the star-forming galaxies with higher [12 + log (O/H) > 8.1] metallicities are detected at similar or higher ICO surface brightnesses. The data are consistent with a strong dependence of the ICO/MH2≡XCO conversion factor on ambient metallicity. The strikingly low upper limits on some metal-poor galaxies lead us to predict that the conversion factor is nonlinear, increasing sharply below ∼1/10 of the solar metallicity [12 + log (O/H) ≤ 7.9].


Abstract Copyright: ∼

Journal keyword(s): Galaxies: Dwarf - Galaxies: ISM

Simbad objects: 83

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Number of rows : 83
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 1574 AG? 00 43 03.82 -22 14 48.8 15.25 14.73 14.35 14.24 14.2 ~ 137 1
2 Z 384-16 Sy1 00 51 59.620 -00 29 12.22   15.8   15.1 15.8 ~ 51 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 6dFGS gJ012646.5-003845 H2G 01 26 46.6028219232 -00 38 46.165233696   17   15.46   ~ 58 0
5 LEDA 5756 GiC 01 32 38.611 -01 38 54.01   16       ~ 13 0
6 LEDA 6065 H2G 01 38 22.6 +01 54 03   18       ~ 12 0
7 MCG-02-05-050 AG? 01 48 25.68 -12 22 55.3   13.4   13.4 13.5 ~ 50 0
8 LEDA 6973 H2G 01 52 53.8243003632 -00 54 07.524735804   17       ~ 20 0
9 MCG+06-06-054 AG? 02 32 54.00 +38 40 50.1   17   14.50   ~ 50 0
10 NGC 1156 GiG 02 59 42.8528847264 +25 14 28.352017320 12.13 12.32 11.74     ~ 323 1
11 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
12 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 264 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
14 UGCA 116 AGN 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 561 0
15 Z 206-10 AG? 07 28 17.724 +40 46 11.36   15.50       ~ 155 0
16 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
17 MCG+07-16-011 AG? 07 41 25.777 +40 06 46.05   16.0       ~ 125 0
18 Z 87-30 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 233 0
19 NGC 2537 H2G 08 13 14.643 +45 59 23.25 12.18 12.50 11.69 11.66   ~ 314 2
20 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
21 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 209 1
22 MCG+07-18-004 LSB 08 28 28.560 +41 51 27.13   18       ~ 175 0
23 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
24 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
25 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
26 NGC 2976 GiG 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 712 1
27 Z 152-72 EmG 09 50 22.769 +31 29 17.80   14.48   14.10   ~ 207 0
28 Z 153-5 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55 26.509 ~ 252 1
29 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
30 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
31 Z 153-24 AG? 10 09 31.600 +30 09 06.21   15.5       ~ 59 0
32 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
33 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
34 NGC 3274 EmG 10 32 17.2253817864 +27 40 07.165226244   13.30   12.77   ~ 261 0
35 Z 154-31 AG? 10 36 43.1428583040 +31 32 50.189204040   15.6   15.04   ~ 121 0
36 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 378 1
37 UGC 6345 B H2G 11 20 14.60 +02 31 51.0   18       ~ 24 1
38 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
39 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
40 Z 12-40 EmG 11 36 36.636 +00 49 02.61   15.3   14.518 15.1 ~ 124 0
41 Z 12-81 Sy1 11 47 00.736 -00 17 38.88   15.1   14.522   ~ 50 0
42 Z 12-85 Sy1 11 48 18.153 -01 38 23.05   15.6   15.847   ~ 34 0
43 Z 12-105 H2G 11 50 36.30 -00 34 03.3   15.472   14.895 15.5 ~ 58 0
44 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
45 LEDA 37102 Sy1 11 51 33.3537570144 -02 22 21.893502576   17       ~ 179 0
46 Z 12-111 Sy1 11 52 37.19 -02 28 09.9   14.79   14.09 14.9 ~ 184 0
47 IC 745 AGN 11 54 12.2719925760 +00 08 11.823367524   14.59 14.19     ~ 139 1
48 Z 157-55 AG? 11 55 39.7060218792 +31 31 06.535928784   15.7       ~ 138 0
49 2dFGRS TGN313Z019 H2G 12 01 30.5289574848 -01 26 09.991251528   18   17.164   ~ 22 0
50 NGC 4144 GiG 12 09 58.601 +46 27 25.85   12.17   11.50   ~ 260 0
51 Mrk 1313 Sy1 12 12 14.7430689744 +00 04 20.530354908   17.56 17.40     ~ 79 0
52 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
53 Z 14-9 H2G 12 19 53.199 +01 46 24.13   15.2 14.80 15.213   ~ 52 0
54 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
55 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
56 Z 216-4 GiG 12 27 40.90 +43 29 44.0 13.75 13.10 12.7 12.33   ~ 270 0
57 Z 187-46 GiP 12 28 28.084 +37 14 05.36   15.6       ~ 105 0
58 Z 159-13 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 180 0
59 NGC 4523 GiC 12 33 47.9911135872 +15 10 06.049286292   15.1       ~ 178 0
60 NGC 4605 GiG 12 39 59.2837284936 +61 36 32.822365392   10.94   10.35   ~ 347 2
61 NGC 4670 AG? 12 45 17.150 +27 07 31.76   12.6 12.90     ~ 271 0
62 NGC 4707 AG? 12 48 21.666 +51 09 53.81   15.2       ~ 113 0
63 NGC 4789A GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 614 1
64 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
65 Z 15-53 EmG 12 59 57.748 +02 03 01.09   15.5   14.458   ~ 69 0
66 Z 316-9 AG? 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 268 1
67 Z 245-36 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 297 0
68 LEDA 46044 AG? 13 14 32.60014 +02 33 52.8153   16       ~ 20 0
69 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
70 Mrk 67 EmG 13 41 56.4808997304 +30 31 09.652262088   16.5       ~ 96 0
71 Z 190-66 AG? 13 50 51.3127548768 +38 01 14.958828876 15.56 14.78   14.33   ~ 161 0
72 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
73 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
74 MCG+10-21-013 AG? 14 35 24.077 +57 15 21.24   17       ~ 91 0
75 Z 193-4 H2G 14 50 56.495 +35 34 18.27   14.5 14.83     ~ 212 0
76 Z 274-49 bCG 15 37 04.237 +55 15 47.60   15.2       ~ 136 0
77 Z 251-4 AG? 16 16 17.9000468088 +47 02 43.128874644   14.9       ~ 151 0
78 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
79 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
80 NGC 7077 AG? 21 29 59.634 +02 24 51.75 14.05 14.25 13.67 13.23 12.86 ~ 106 0
81 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
82 Z 533-8 GiG 23 29 58.540 +40 59 31.98   15.7       ~ 110 0
83 Z 497-42 bCG 23 37 39.543 +30 07 45.93   15.50       ~ 64 0

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