Testing the ADAF paradigm for supermassive black holes

Details Testing the ADAF paradigm for supermassive black holes Testing the ADAF paradigm for supermassive black holes

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.400d&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Although Advection Dominated Accretion Flow ADAF) models have been applied to a number of low-luminosity systems compelling observational evidence for their existence is still required. Here, we examine new high-frequency radio observations of the three low-luminosity ellipticalgalaxies NGC 4649, NGC 4472 and NGC 4636 obtained using the VLA and SCUBA. At these frequencies the predictions are very precise and an ADAF is inequivocably characterised by a slowly rising spectrum with a sharp spectral cut-off produced by thermal synchrotron radiation.The new radio limits show a severe discrepancy with the canonical ADAF predictions and significantly overestimate the observed flux. We discuss the physical implications for ADAF models.

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