LOW CO LUMINOSITIES IN DWARF GALAXIES

We present maps of [sup12]COJ = 2-1 emission covering the entire star-forming disks of 16 nearby dwarf galaxies observed by the IRAM HERACLES survey. The data have 13" angular resolution, ~250 pc at our average distance of D = 4 Mpc, and sample the galaxies by 10-1000 resolution elements. We ap...

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Bibliographic Details
Published in:	The Astronomical journal 2012-06, Vol.143 (6), p.1-18
Main Authors:	Schruba, Andreas, Leroy, Adam K, Walter, Fabian, Bigiel, Frank, Brinks, Elias, DE BLOK, W J G, Kramer, Carsten, ROSOLOWSKY, ERIK, Sandstrom, Karin, Schuster, Karl, USERO, ANTONIO, Weiss, Axel, WIESEMEYER, HELMUT
Format:	Article
Language:	eng
Subjects:	ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY CARBON MONOXIDE COMPARATIVE EVALUATIONS CONVERSION COSMIC DUST DISTANCE Dwarf galaxies Emission GALAXIES HYDROGEN ION EMISSION LUMINOSITY MOLECULES RED SHIFT RESOLUTION Searching Stacking STAR EVOLUTION Star formation STARS
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Summary:	We present maps of [sup12]COJ = 2-1 emission covering the entire star-forming disks of 16 nearby dwarf galaxies observed by the IRAM HERACLES survey. The data have 13" angular resolution, ~250 pc at our average distance of D = 4 Mpc, and sample the galaxies by 10-1000 resolution elements. We apply stacking techniques to perform the first sensitive search for CO emission in dwarf galaxies outside the Local Group ranging from individual lines of sight, stacking over IR-bright regions of embedded star formation, and stacking over the entire galaxy. This has direct consequences for the detectability of star-forming galaxies at high redshift, which presumably have on average sub-solar metallicity..
ISSN:	0004-6256 1538-3881 1538-3881