Abstract
Data from the H I Parkes All-Sky Survey (HIPASS) of the southern sky in the neutral hydrogen line are used to determine the radial velocities and widths of the H I line for flat spiral galaxies of the Revised Flat-Galaxy Catalog (RFGC) seen edge-on. The sample of 103 flat galaxies detected in HIPASS is characterized by a median radial velocity of +2037 km/sec and a median width of the H I line at the level of 50% of maximum of 242 km/sec. For RFGC galaxies the 50% detection level in HIPASS corresponds to an apparent magnitude B t = 14m.5 or an angular diameter a = 2′.9. The relative number of detected galaxies increases from 2% for the morphological types Sbc and Sc to 41% for the type Sm. The median value of the ratio of hydrogen mass to total mass for RFGC galaxies is 0.079. With allowance for the average internal extinction for edge-on galaxies, <ΔB t< = 0m.75, the median ratio of hydrogen mass to luminosity, M H I/L B = 0.74 M ⊙/L ⊙, is typical for late-type spirals. Because of its small depth, HIPASS reveals only a few RFGC galaxies with previously unknown velocities and line widths.
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Karachentsev, I.D., Smirnova, A.A. Flat Galaxies of the RFGC Catalog Detected in the HIPASS Survey. Astrophysics 45, 448–457 (2002). https://doi.org/10.1023/A:1021803028742
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DOI: https://doi.org/10.1023/A:1021803028742