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The Extragalactic Distance Database: All Digital HI Profile Catalog Export

(20 Feb 2009)

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cosmology datamining distance radio

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An important component of the Extragalactic Distance Database (EDD) is a group of catalogs related to the measurement of HI line profile parameters. One of these is the All Digital HI catalog which contains an amalgam of information from new data and old. The new data results from observations with Arecibo Telescope and with the Green Bank Telescope (GBT), including continuing input since the award of the NRAO Cosmic Flows Large Proposal. The old data has been collected from archives, wherever available, particularly the Cornell University Digital HI Archive and the Nancay Telescope extragalactic HI archive. The catalog currently contains information on ~16,000 profiles relating to ~12,500 galaxies. The channel - flux per channel files, from whatever source, are carried through a common pipeline. The derived parameter of greatest interest is W_m50, the profile width at 50% of the mean flux. After appropriate adjustment, the parameter W_mx is derived, the linewidth which statistically approximates the peak to peak maximum rotation velocity before correction for inclination, 2 V_max sin(i).


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