Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1019s&link_type=abstract
Astronomical Journal v.110, p.1019
Astronomy and Astrophysics
Astronomy
4
Infrared: Galaxies, Galaxies: Starburst, Galaxies: Active
Scientific paper
We address the key question of the source of the major fraction of luminosity from highly luminous extragalactic systems. An infrared spectral index versus radio spectral index diagram places some AGN, QSOs, and luminous infrared galaxies near those for which luminosity is attributed to star formation. A striking contrast is displayed between the first two QSOs identified 3C 48 and 3C 273 in this diagram. A comparison of many observed characteristics from radio frequencies to gamma rays of these two objects rather conclusively demonstrates that the supermassive black hole paradigm that most likely applies to a flat spectrum radio source such as 3C 273 does not apply in the same way to 3C 48. We suggest that objects exhibiting relatively strong radio emission that have been inferred to harbor supermassive compact objects (monsters) may not contain energy dominant monsters (EDMs). 3C 48 and NGC 5128 (Cen A), according to this test, do not contain EDMs. A flat 60/25 micron spectral index is proposed as the preferred method to select these EDMs. Most objects cataloged as QSOs in the PG survey exhibit characteristics attributable to EDMs, however, some such objects clearly do not.
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