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First results from the lick AGN monitoring project: The mass of the black hole in ARP 151

  • Author(s): Bentz, MC
  • Walsh, JL
  • Barth, AJ
  • Baliber, N
  • Bennert, N
  • Canalizo, G
  • Filippenko, AV
  • Ganeshalingam, M
  • Gates, EL
  • Greene, JE
  • Hidas, MG
  • Hiner, KD
  • Lee, N
  • Li, W
  • Malkan, MA
  • Minezaki, T
  • Serduke, FJD
  • Shiode, JH
  • Silverman, JM
  • Steele, TN
  • Stern, D
  • Street, RA
  • Thornton, CE
  • Treu, T
  • Wang, X
  • Woo, JH
  • Yoshiill, Y
  • et al.

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We have recently completed a 64 night spectroscopic monitoring campaign at the Lick Observatory 3 m Shane telescope with the aim of measuring the masses of the black holes in 13 nearby (z<0.05) Seyfert 1 galaxies with expected masses in the range-106-107M⊙. We present here the first results from this project-the mass of the central black hole in Arp 151. Strong variability throughout the campaign led to an exceptionally clean Hβ lag measurement in this object of 4.25+0.68-0.66days in the observed frame. Coupled with the width of the Hβ emission line in the variable spectrum, we determine a black hole mass of (7.1 ± 1.2) × 106M⊙, assuming the Onken et al. normalization for reverberation-based virial masses. We also find velocity-resolved lag information within the Hβ emission line which clearly shows infalling gas in the Hβ-emitting region. Further detailed analysis may lead to a full model of the geometry and kinematics of broad line region gas around the central black hole in Arp 151. © 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.

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