Abstract
view Abstract Citations (155) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Compact Galaxies and Compact Parts of Galaxies. II Zwicky, F. Abstract The range of surface brightness characteristics for ordinary and for compact galaxies is discussed. Long- and short-exposure photographs of NGC 4874 and its neighbors illustrate the respective presence or absence of compact cores of galaxies which in appearance are stellar and comparable in luminosity to the isolated medium galaxies. Representatives of a subclass of compact galaxies are discussed whose spectra are continuous, with a variety of allowed and forbidden emission lines of H, He ii, C iii, C iv, [0 iii, [0 isri, [Ne iii), [Ne vi, and [S iij superposed. The symbolic velocities of recession of the objects chosen range from V = 764 km/sec to 11470 km/sec; their indicative absolute photographic magnitudes, from M = - 11.8 to -20.9; their surface brightness cr, from 15.6 to 19.0 per square second of arc; and the indicative diameters of their compact cores, from 68 to 1400 pc. If the double system at R.A. 9i'30" 30" and decl. + ' (1950) can be assumed to be stationary, its indicative mass is _ 7.2 x 106 o and its indicative relative mass-luminosity ratio ) > 13.6. Some characteristics of two compact galaxies, one with a continuous featureless spectrum and the other with a broad-banded emission spectrum are discussed. About one hundred compact galaxies and compact parts of galaxies have been investigated so far with the 200-inch telescope, and it was found that they begin to populate all the empty regions which existed in the diagram of structural characteristics of galaxies versus spectral types as it was established for about 550 of the galaxies investigated by Humason, Mayali, and Sandage. Publication: The Astrophysical Journal Pub Date: January 1966 DOI: 10.1086/148490 Bibcode: 1966ApJ...143..192Z full text sources ADS | data products NED (28) Related Materials (1) Part 1: 1964ApJ...140.1467Z
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