The Mass of the Black Hole in the Quasar PG2130+099
نویسندگان
چکیده
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 PG2130+099. Cross correlation of the 5100 Å continuum and Hβ emission-line light curves yields a time lag of 22.9 −4.3 days, corresponding to a central black hole mass MBH = (3.8 ± 1.5)×10M⊙. 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 Hβ emission-line equivalent width. With our new measurements, PG2130+099 is no longer an outlier in either the RBLR–L or the MBH–σ∗ relationships. Subject headings: galaxies: active — galaxies: nuclei — galaxies: Seyfert — quasars: emission lines
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