NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-21 T09:15:27 PDT
Help | Comment | NED Home

For refcode 1978ApJ...223..391D:
Retrieve 113 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1978ApJ...223..391D INTEGRATED MASSES OF GALAXIES JOHN R. DICKEL University of Illinois Observatory; and Sterrewacht, Leiden AND HERBERT J. ROOD Department of Astronomy and Astrophysics, Michigan State University Received 1977 October 24; accepted 1978 February 2 ABSTRACT Twenty-one centimeter hydrogen line velocities, half-widths, and fluxes are presented for 112 spiral and irregular galaxies, the majority in groups. Comparison of our velocities with values listed in the de Vaucouleurs Second Reference Catalog (RC2) suggests that the mean errors of RC2 velocities may be underestimated typically by a factor of 1.5. Integrated Brandt masses (M_T_) are derived from the half-widths, taking into account the increased knowledge of the properties of galactic rotation curves obtained by Buchtmeier. Masses derived by our technique are, on the average, within a factor of 1.4 of those determined by detailed analysis of individual rotation curves. Holmberg luminosities corrected for internal and Galactic extinction (L_pg_) are determined. Our sample of galaxies has an average integrated mass-to-light ratio <M_T_/L_pg_> = 11 +/- 1 solar units (when H = 50 km s^-1^ Mpc^-1^), and <M_T_/L_pg_> is independent of morphological type. The mass-to-light ratio of the region within a Holmberg radius, however, tends to decrease toward later Bubble types. Subject headings: galaxies: clusters of D galaxies: general D galaxies: structure D line profiles D radio sources: 21 cm radiation
Retrieve 113 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home