The Mass of the Black Hole in the Quasar PG 2130+099

Details The Mass of the Black Hole in the Quasar PG 2130+099 The Mass of the Black Hole in the Quasar PG 2130+099

2008-08-04

arxiv.org/abs/0808.0507v1

2008 ApJ, 688, 837

Astronomy and Astrophysics

Astrophysics

21 pages, 7 figures; Accepted for publication in ApJ

Scientific paper

10.1086/592269

We present the results of a recent reverberation-mapping campaign undertaken to improve measurements of the radius of the broad line region and the central black hole mass of the quasar PG 2130+099. Cross correlation of the 5100 angstrom continuum and H-beta emission-line light curves yields a time lag of 22.9 (+4.4 - 4.3) days, corresponding to a central black hole mass MBH= 3.8 (+/- 1.5) x 10^7 Msun. This value supports the notion that previous measurements yielded an incorrect lag. We re-analyzed previous datasets to investigate the possible sources of the discrepancy and conclude that previous measurement errors were apparently caused by a combination of undersampling of the light curves and long-term secular changes in the H-beta emission-line equivalent width. With our new measurements, PG 2130+099 is no longer an outlier in either the R-L or the MBH-Sigma relationships.

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