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Date and Time of the Query: 2019-08-25 T16:35:16 PDT
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For refcode 1999ApJ...524..612B:
Retrieve 31 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1999ApJ...524..612B New Galaxies Discovered in the First Blind H I Survey of the Centaurus A Group G. D. Banks, M. J. Disney, P. M. Knezek, H. Jerjen, D. G. Barnes, R. Bhatal, W. J. G. de Blok, P. J. Boyce, R. D. Ekers, K. C. Freeman, B. K. Gibson, P. A. Henning, V. Kilborn, B. Koribalski, R. C. Kraan-Korteweg, D. F. Malin, R. F. Minchin, J. R. Mould, T. Oosterloo, R. M. Price, M. E. Putman, S. D. Ryder, E. M. Sadler, L. Staveley-Smith, I. Stewart, F. Stootman, R. A. Vaile, R. L. Webster, and A. E. Wright Received 1999 March 19; accepted 1999 June 3 ABSTRACT We have commenced a 21 cm survey of the entire southern sky ({delta} < 0^deg^, -1200 km s^-1^ < v_sun_ < 12,700 km s^-1^) that is "blind," i.e., unbiased by previous optical information. In the present paper we report on the results of a pilot project that is based on data from this all-sky survey. The project was carried out on an area of 600 deg^2^ centered on the nearby Centaurus A (Cen A) group of galaxies at a mean velocity of v_sun_ ~ 500 km s^-1^. This was recently the subject of a separate and thorough optical survey. We found 10 new group members to add to 21 galaxies already known in the Cen A group: five of these are previously uncataloged galaxies, while five were previously catalogued but not known to be associated with the group. Most of the new members have H I masses close to our survey limit of 10^7^ M_sun_ at the assumed group distance of 3.5 Mpc. The new detection with the largest H I mass is ESO 174-G?001 with M_HI_ = 2.1 x 10^8^ M_sun_. Prior to our survey this galaxy was an uncertain optical identification because of high Galactic extinction. We found optical counterparts for all the H I detections, most of them intrinsically very faint (M_B_> -13.0), low surface brightness dwarf galaxies with H I profile line-widths suggestive of dynamics dominated by dark matter. The new group members add approximately 6% to the H I mass of the group and 4% to its light. The H I mass function, derived from all the known group galaxies in the interval 10^7^ M_sun_ < M_HI_ < 10^9^ M_sun_, has a faint-end slope of 1.30 +/- 0.15, allowing us to rule out a slope of 1.7 at 95% confidence. Even if the number in the lowest mass bin is increased by 50%, the slope only increases to 1.45 +/- 0.15. Subject headings: galaxies: clusters: individual (Centaurus A)-galaxies: distances and redshifts-galaxies: ISM-radio lines: galaxies-surveys
Retrieve 31 NED objects in this reference.
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