2006ApJ...643..825L


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.10CEST02:33:07

2006ApJ...643..825L - Astrophys. J., 643, 825-843 (2006/June-1)

Molecular gas in the low-metallicity, star-forming dwarf IC 10.

LEROY A., BOLATTO A., WALTER F. and BLITZ L.

Abstract (from CDS):

We present a complete survey of CO (1⟶0) emission in the Local Group dwarf irregular IC 10. The survey, conducted with the BIMA interferometer, covers the stellar disk and a large fraction of the extended H I envelope with the sensitivity and resolution necessary to detect individual giant molecular clouds (GMCs) at the distance of IC 10 (950 kpc). We find 16 clouds with a total CO luminosity of 1x106 K.km.s–1.pc2, equivalent to 4x106 Mof molecular gas using the Galactic CO-to-H2conversion factor. Observations with the ARO 12 m find that BIMA may resolve out as much as 50% of the CO emission, and we estimate the total CO luminosity as ∼2.2x106 K.km.s–1.pc2. We measure the properties of 14 GMCs from high-resolution OVRO data. These clouds are very similar to Galactic GMCs in their sizes, line widths, luminosities, and CO-to-H2conversion factors, despite the low metallicity of IC 10 (Z~1/5 Z). Comparing the BIMA survey to the atomic gas and stellar content of IC 10, we find that most of the CO emission is coincident with high surface density H I. IC 10 displays a much higher star formation rate per unit molecular (H2) or total (H I+H2) gas than most galaxies. This could be a real difference or may be an evolutionary effect–the star formation rate may have been higher in the recent past.

Abstract Copyright:

Journal keyword(s): Galaxies: Dwarf - Galaxies: ISM - ISM: Molecules - Stars: Formation

Nomenclature: Tables 4-5: [LBW2006] BNNa (Nos B1-B9, B9a-B9c, B10-B11, B11a-B11d, B12-B16).

Simbad objects: 31

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Number of rows : 31

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 [LBW2006] B1 MoC 00 19 58.60 +59 18 40.6           ~ 1 0
2 [LBW2006] B2 MoC 00 20 00.80 +59 19 04.9           ~ 1 0
3 [LBW2006] B3 MoC 00 20 01.30 +59 16 42.3           ~ 1 0
4 [LBW2006] B4 MoC 00 20 11.90 +59 20 02.2           ~ 1 0
5 [LBW2006] B5 MoC 00 20 17.20 +59 18 43.3           ~ 1 0
6 [LBW2006] B6 MoC 00 20 19.60 +59 20 48.1           ~ 1 0
7 [LBW2006] B7 MoC 00 20 21.20 +59 20 08.1           ~ 1 0
8 [LBW2006] B8 MoC 00 20 21.60 +59 17 08.8           ~ 3 0
9 [LBW2006] B9a MoC 00 20 22.30 +59 21 05.6           ~ 1 0
10 [LBW2006] B9b MoC 00 20 22.50 +59 21 21.4           ~ 1 0
11 [LBW2006] B9 MoC 00 20 22.90 +59 21 18.3           ~ 3 0
12 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1009 0
13 [LBW2006] B9c MoC 00 20 23.70 +59 21 17.9           ~ 1 0
14 [LBW2006] B11a MoC 00 20 27.20 +59 16 53.8           ~ 3 0
15 [LBW2006] B11b MoC 00 20 27.30 +59 17 05.0           ~ 3 0
16 [LBW2006] B10 MoC 00 20 27.60 +59 17 26.2           ~ 1 0
17 [LBW2006] B11 MoC 00 20 27.70 +59 16 59.4           ~ 4 0
18 [LBW2006] B11c MoC 00 20 28.10 +59 16 57.0           ~ 2 0
19 [LBW2006] B11d MoC 00 20 29.00 +59 17 04.6           ~ 2 0
20 [LBW2006] B12 MoC 00 20 29.80 +59 19 34.0           ~ 1 0
21 [LBW2006] B13 MoC 00 20 31.30 +59 18 09.9           ~ 1 0
22 [LBW2006] B14 MoC 00 20 32.60 +59 17 21.6           ~ 1 0
23 [LBW2006] B15 MoC 00 20 34.40 +59 19 24.0           ~ 1 0
24 [LBW2006] B16 MoC 00 20 48.10 +59 18 58.1           ~ 1 0
25 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10949 1
26 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9478 1
27 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5148 1
28 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1150 3
29 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14874 1
30 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1432 0
31 NAME Local Group GrG ~ ~           ~ 7000 0

    Equat.    Gal    SGal    Ecl

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2020.08.10-02:33:07

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