Stellar velocity dispersion and black hole mass in the BL Lac object Markarian 501

Details Stellar velocity dispersion and black hole mass in the BL Lac object Markarian 501 Stellar velocity dispersion and black hole mass in the BL Lac object Markarian 501

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19915006b&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #150.06; Bulletin of the American Astronomical Society, Vol. 33, p.1530

Astronomy and Astrophysics

Astronomy

Scientific paper

The recently discovered tight correlation between black hole mass and stellar velocity dispersion in galaxy bulges offers a new way to estimate the black hole masses in nearby galaxies. We have obtained new optical spectra of the BL Lac object Markarian 501 at the Palomar Observatory. From the widths of the Ca II triplet lines, we derive a stellar velocity dispersion of 390 km/s in the nuclear region of the host galaxy. If this galaxy follows the locally-defined M-σ correlation, then its central black hole has M ~ (1.5-3.5)*E9 solar masses. This is significantly larger than some previous estimates for the black hole mass in Mrk 501, but similar to central masses observed in nearby radio galaxies in giant elliptical hosts such as M87.

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