[LBW2006] B9b , the SIMBAD biblio

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

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


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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