The Ubiquitous Radio Continuum Emission from the Most Massive Early-Type Galaxies

Details The Ubiquitous Radio Continuum Emission from the Most Massive Early-Type Galaxies The Ubiquitous Radio Continuum Emission from the Most Massive Early-Type Galaxies

2011-03-15

arxiv.org/abs/1103.2828v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in ApJ Letters. 5 pages, 4 figures and 1 table

Scientific paper

We have measured the radio continuum emission of 396 early-type galaxies brighter than K = 9, using 1.4 GHz imagery from the NRAO VLA Sky Survey, Green Bank 300-ft Telescope and 64-m Parkes Radio Telescope. For M_K < -24 early-type galaxies, the distribution of radio powers at fixed absolute magnitude spans 4 orders of magnitude and the median radio power is proportional to K-band luminosity to the power 2.78\pm0.16. The measured flux densities of M_K < -25.5 early-type galaxies are greater than zero in all cases. It is thus highly likely that the most massive galaxies always host an active galactic nucleus or have recently undergone star formation.

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