1998AJ....116.2746T


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET07:39:02

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 - 2021
#notes
1 IC 1574 G 00 43 03.82 -22 14 48.8 15.25 14.73 14.35 14.24 14.2 ~ 114 1
2 MCG+00-03-018 Sy1 00 51 59.620 -00 29 12.22   15.8   15.1 15.8 ~ 39 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9600 1
4 6dFGS gJ012646.5-003845 H2G 01 26 46.599 -00 38 46.08   17   15.46   ~ 52 0
5 LEDA 5756 GiC 01 32 38.611 -01 38 54.01   16       ~ 10 0
6 LEDA 6065 H2G 01 38 22.6 +01 54 03   18       ~ 12 0
7 MCG-02-05-050 IG 01 48 25.7 -12 22 55   13.4   13.4 13.5 ~ 43 0
8 LEDA 6973 H2G 01 52 53.820 -00 54 07.64   17       ~ 19 0
9 UGC 2014 G 02 32 54.00 +38 40 50.1   17   14.50   ~ 44 0
10 NGC 1156 rG 02 59 42.8526900556 +25 14 28.350265697 12.13 12.32 11.74     ~ 281 1
11 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1160 3
12 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 241 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15050 1
14 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 502 0
15 UGC 3860 G 07 28 17.724 +40 46 11.36   15.50       ~ 137 0
16 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 710 0
17 UGC 3966 G 07 41 25.777 +40 06 46.05   16.0       ~ 104 0
18 UGC 3974 G 07 41 56.3061361330 +16 48 07.439323443   15.4       ~ 205 0
19 NGC 2537 IG 08 13 14.643 +45 59 23.25 12.18 12.50 11.69 11.66   ~ 274 1
20 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 700 2
21 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 189 1
22 UGC 4426 G 08 28 28.560 +41 51 27.13   18       ~ 135 0
23 UGC 4483 GiG 08 37 03.29 +69 46 29.2 15.70 15.46 14.98 14.89   ~ 270 0
24 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1007 1
25 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 325 1
26 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 592 1
27 UGC 5272 G 09 50 22.769 +31 29 17.80   14.48   14.10   ~ 170 0
28 UGC 5340 G 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55   ~ 186 1
29 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 552 0
30 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 695 0
31 UGC 5478 G 10 09 31.600 +30 09 06.21   15.5       ~ 46 0
32 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 657 2
33 IC 2574 G 10 28 23.6204574649 +68 24 43.441365350 11.70 11.07 10.87 10.74   ~ 610 1
34 NGC 3274 EmG 10 32 17.2228402368 +27 40 07.160374345   13.30   12.77   ~ 202 0
35 UGC 5764 IG 10 36 43.1427419501 +31 32 50.184648977   15.6   15.04   ~ 95 0
36 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 326 1
37 UGC 6345 B H2G 11 20 14.60 +02 31 51.0   18       ~ 24 1
38 Mrk 178 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 215 1
39 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 254 0
40 UGC 6578 EmG 11 36 36.636 +00 49 02.61   15.3   14.518 15.1 ~ 116 0
41 2dFGRS TGN310Z174 Sy1 11 47 00.736 -00 17 38.88   15.1   14.522   ~ 40 0
42 2MASX J11481815-0138230 Sy1 11 48 18.153 -01 38 23.05   15.6   15.847   ~ 24 0
43 2dFGRS TGN311Z094 H2G 11 50 36.2 -00 34 05   15.472   14.895 15.5 ~ 52 0
44 UGC 6817 G 11 50 52.984 +38 52 50.92   13.72 13.9 13.39   ~ 155 0
45 LEDA 37102 Sy1 11 51 33.3534243441 -02 22 21.893770899   17       ~ 148 0
46 Mrk 1307 Sy1 11 52 37.19 -02 28 09.9   14.79   14.09 14.9 ~ 160 0
47 IC 745 AGN 11 54 12.250 +00 08 11.68   14.59 14.19     ~ 116 1
48 UGC 6900 G 11 55 39.7065939676 +31 31 06.530347793   15.7       ~ 100 0
49 2dFGRS TGN313Z019 H2G 12 01 30.5287515258 -01 26 09.993347843   18   17.164   ~ 17 0
50 NGC 4144 GiG 12 09 58.601 +46 27 25.85   12.17   11.50   ~ 207 0
51 Mrk 1313 Sy1 12 12 14.7452482805 +00 04 20.471415272   17.56 17.40     ~ 68 0
52 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 873 1
53 2dFGRS TGN385Z034 H2G 12 19 53.199 +01 46 24.13   15.2   15.213   ~ 38 0
54 Mrk 209 bCG 12 26 16.02 +48 29 36.6   15.3       ~ 307 0
55 UGC 7559 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 174 0
56 UGC 7577 GiG 12 27 41.8803124881 +43 29 58.140216428 13.75 13.10 12.7 12.33   ~ 231 0
57 UGC 7599 GiP 12 28 28.084 +37 14 05.36   15.6       ~ 87 0
58 UGC 7698 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 139 0
59 NGC 4523 GiG 12 33 47.9912503954 +15 10 06.048815115   15.1       ~ 152 0
60 NGC 4605 GiG 12 39 59.381 +61 36 33.09   10.94   10.35   ~ 291 2
61 NGC 4670 IG 12 45 17.150 +27 07 31.76   12.6       ~ 232 0
62 NGC 4707 G 12 48 21.666 +51 09 53.81   15.2       ~ 93 0
63 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 542 1
64 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 443 0
65 UGC 8105 EmG 12 59 57.748 +02 03 01.09   15.5   14.458   ~ 55 0
66 UGC 8201 G 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 226 1
67 UGC 8320 G 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 241 0
68 2MASS J13143261+0233524 G 13 14 32.600 +02 33 52.82   16       ~ 17 0
69 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1276 4
70 Mrk 67 EmG 13 41 56.4813088486 +30 31 09.649163533   16.5       ~ 88 0
71 UGC 8760 G 13 50 51.3121098935 +38 01 14.956142286 15.56 14.78   14.33   ~ 132 0
72 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 257 0
73 UGC 9240 G 14 24 43.0755108543 +44 31 31.754423687 14.24 13.54 13.17 13.07   ~ 182 0
74 UGC 9405 G 14 35 24.077 +57 15 21.24   17       ~ 78 0
75 Mrk 829 GiP 14 50 56.495 +35 34 18.27   14.5 14.83     ~ 195 0
76 Mrk 487 bCG 15 37 04.237 +55 15 47.60   15.2       ~ 127 0
77 UGC 10310 IG 16 16 17.9040378078 +47 02 43.158504118   14.9       ~ 128 0
78 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1445 0
79 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 398 1
80 NGC 7077 G 21 29 59.634 +02 24 51.75 14.05 14.25 13.67 13.23 12.86 ~ 97 0
81 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 423 1
82 UGC 12632 GiG 23 29 58.78 +40 59 25.2   15.7       ~ 88 0
83 NAME Barbon's Galaxy bCG 23 37 39.543 +30 07 45.93   15.50       ~ 58 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-07:39:02

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