2001A&A...366..811T


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.27CET14:19:36

2001A&A...366..811T - Astronomy and Astrophysics, volume 366, 811-816 (2001/2-2)

A search for CO in the Local Group dwarf irregular galaxy WLM.

TAYLOR C.L. and KLEIN U.

Abstract (from CDS):

We present 12CO J = 1->0 and J = 2->1 observations of the low metallicity (12 + log(O/H) = 7.74) Local Group dwarf irregular galaxy WLM made with the 15 m SEST and 14 m FCRAO telescopes. Despite the presence a number of HII regions, we find no CO emission. We obtain low upper limits on the integrated intensity (ICO≤0.18K.km/s for CO (1->0)). The non-detection is consistent with the result of Taylor, Kobulnicky & Skillman (1998AJ....116.2746T), that dwarf galaxies below a metallicity of ∼7.9 are not detected in CO emission. WLM shows that this trend continues for low metallicity galaxies even as their metallicities approach 7.9. These results are consistent with the models of the metal poor ISM by Norman & Spaans (1997ApJ...480..145N). By comparing our CO data with observations of star formation in WLM, we find evidence for a high CO to H2 conversion factor.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: individual: WLM - galaxies: ISM - radio lines: galaxies

Simbad objects: 10

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Number of rows : 10

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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 582 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1015 0
3 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 193 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5195 1
5 NGC 604 HII 01 34 32.1 +30 47 01           ~ 551 0
6 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1158 3
7 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 870 1
8 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 442 0
9 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1443 0
10 NAME Local Group GrG ~ ~           ~ 7074 0

    Equat.    Gal    SGal    Ecl

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2020.10.27-14:19:36

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