Mathematics – Logic
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1307d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, June 1987, p. 1307-1317. Research supported by Harvard University.
Mathematics
Logic
68
Galactic Structure, Radio Galaxies, Red Shift, Star Formation, Astronomical Spectroscopy, Cosmology, Galactic Evolution, Line Spectra, Luminosity, Morphology
Scientific paper
The authors report the results of a multiwavelength study of the high-redshift radio galaxy 3C 368, which is observed at a lookback time of about two-thirds of the present galaxian age. This galaxy has optical and spectroscopic properties that are perhaps typical for the powerful 3CR galaxies at large redshifts (z > 1), though it is probably more luminous than the most, both in continuum and [O II]. Its resolved, multicomponent morphology of the starlight continuum and the [O II] λ3727 emission-line gas, and the properties of the ionized-gas velocity field, are suggestive of a strong and highly dissipative merger. The proposed merger is probably enhancing the star formation over the whole galaxy and may be the primary source of the fuel for, or even the trigger of, the strong radio emission from the system. The morphological and spectroscopic similarities with other 3CR galaxies at z > 1 suggest that spectacular merging was a common process in such systems at early epochs. The mergers may be identified with the process of transformation of (large?) E galaxies into cD's, and the epoch of such "secondary" formation of gE/cD galaxies may be signalled by the appearance of powerful radio sources at z ≡ 1 - 2. The galaxy evolution models with a continuing star formation, suggested by the colors and magnitudes of high-redshift 3CR galaxies, may be understood in terms of a declining sequence of starbursts, stimulated by gas-rich mergers.
Djorgovski Stanislav
Pedelty Jeffrey
Rudnick Lawrence
Spinrad Hyron
Stockton Alan
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