/ftp/cats/aliases/K/./KDM2005



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J/ApJ/626/887    HI clouds in Southern Galactic Plane Survey    (Kavars+, 2005)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
	table2.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJ/626/887
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Beginning of ReadMe : J/ApJ/626/887 HI clouds in Southern Galactic Plane Survey (Kavars+, 2005) ================================================================================ "Missing link" clouds in the Southern Galactic Plane Survey. Kavars D.W., Dickey J.M., McClure-Griffiths N.M., Gaensler B.M., Green A.J. <Astrophys. J., 626, 887-899 (2005)> =2005ApJ...626..887K ================================================================================ ADC_Keywords: Molecular clouds ; H I data ; Radio lines Keywords: Galaxy: structure - ISM: atoms - ISM: clouds - radio lines: ISM Abstract: We present an automated routine to search for HI self-absorption features within the Southern Galactic Plane Survey (SGPS). The data were taken with the Australia Telescope Compact Array (ATCA) and the Parkes Radio Telescope and encompass 3degx105deg of sky in the Galactic plane. We apply our routine to this entire region and derive spin temperatures and column densities for 70 of the larger HISA complexes, finding spin temperatures ranging from 6 to 41K with HI number densities of a few cm^-3^. These "missing link" clouds fill in the spin temperature and density gaps between dense molecular clouds and diffuse atomic clouds. We compare the HI emission with ^12^CO emission and find that 60% of detected HI self-absorption is correlated in space and in velocity with a molecular counterpart. This is potentially due to a molecular/atomic gas transition. We also compare HI self-absorption with Galactic spiral arms and discuss the possibility of using it as a spiral arm tracer. Description: The SGPS is one of three large sky surveys that image HI line emission and 21cm continuum in the plane of the Galaxy. The other two surveys are the CGPS and the VGPS. Together, the three make up the International Galactic Plane Survey (IGPS). The SGPS combines interferometer data from the Australia Telescope Compact Array (ATCA) and single-dish data from the Parkes 64m telescope. It maps the region of 253deg<=l<=358deg and -1.3deg<=b<=+1.3deg with an angular resolution of 2';, a channel spacing of 0.82km/s, and an rms brightness sensitivity per channel of 24K, depending on the brightness of the HI emission (McClure-Griffiths, 2001, Ph.D. thesis, Univ. Minnesota). The SGPS data are divided into cubes of 5degx2.6deg centered on b=0deg and longitudes that are multiples of 5deg. A further description of the data is detailed in McClure-Griffiths et al. (2005ApJS..158..178M). SGPS HI images are available at http://www.atnf.csiro.au/research/HI/sgps/queryForm.html .