/ftp/cats/aliases/G//GALFA-HI



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J/ApJ/758/44          The GALFA-HI compact cloud catalog          (Saul+, 2012)
The following files can be converted to FITS (extension .fit or fit.gz)
	table1.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJ/758/44
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Beginning of ReadMe : J/ApJ/758/44 The GALFA-HI compact cloud catalog (Saul+, 2012) ================================================================================ The GALFA-H I compact cloud catalog. Saul D.R., Peek J.E.G., Grcevich J., Putman M.E., Douglas K.A., Korpela E.J., Stanimirovic S., Heiles C., Gibson S.J., Lee M., Begum A., Brown A.R.H., Burkhart B., Hamden E.T., Pingel N.M., Tonnesen S. <Astrophys. J., 758, 44 (2012)> =2012ApJ...758...44S ================================================================================ ADC_Keywords: H I data ; Diffuse clouds ; Surveys Keywords: galaxies: formation; Galaxy: halo; intergalactic medium; ISM: clouds Abstract: We present a catalog of 1964 isolated, compact neutral hydrogen clouds from the Galactic Arecibo L-Band Feed Array Survey Data Release One. The clouds were identified by a custom machine-vision algorithm utilizing the difference of Gaussian kernels to search for clouds smaller than 20'. The clouds have velocities typically between |V_LSR_|=20 and 400km/s, line widths of 2.5-35km/s, and column densities ranging from 1 to 35x10^18^/cm2. The distances to the clouds in this catalog may cover several orders of magnitude, so the masses may range from less than a solar mass for clouds within the Galactic disk, to greater than 10^4^M_sun_for high-velocity clouds (HVCs) at the tip of the Magellanic Stream. To search for trends, we separate the catalog into five populations based on position, velocity, and line width: HVCs; galaxy candidates; cold low-velocity clouds (LVCs); warm, low positive-velocity clouds in the third Galactic quadrant; and the remaining warm LVCs. The observed HVCs are found to be associated with previously identified HVC complexes. We do not observe a large population of isolated clouds at high velocities as some models predict. We see evidence for distinct histories at low velocities in detecting populations of clouds corotating with the Galactic disk and a set of clouds that is not corotating. Description: The catalog is generated using the GALFA-HI Survey DR1. GALFA-HI is a survey of the 1420MHz hyperfine transition of neutral hydrogen in the Galaxy using the Arecibo 305m telescope and the ALFA seven-beam feed array. The survey is completed commensally with other Arecibo extragalactic and Galactic surveys (Giovanelli et al. 2005AJ....130.2598G; Guram & Taylor 2009ASPC..407..282G). GALFA-HI data provide a channel spacing of 0.184km/s and cover a velocity range of +/-650km/s in the local standard of rest (LSR) with a spatial resolution of 4'. The DR1 data cover 7520deg^2^ of sky in an area between delta=38deg and delta=-1deg (see the bottom panel of Figure 1, and Figure 2), with a range of sensitivity from 120mK to 50mK in 0.74km/s channels. The details of GALFA-HI observing and data reduction, along with the specifics of the DR1 data set, can be found in Peek et al. (2011ApJS..194...20P).