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Revisiting the virial factor with the updated $M_{BH}-{sigma}_*$ relation
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  • Revisiting the virial factor with the updated $M_{BH}-{sigma}_*$ relation
  • Revisiting the virial factor with the updated $M_{BH}-{sigma}_*$ relation
저자명
박대성,우종학,Park. Dae-Seong,Woo. Jong-Hak
간행물명
천문학회보
권/호정보
2012년|37권 1호|pp.35-35 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Determining the virial factor of the broad-line region (BLR) gas is crucial in calibrating AGN black hole mass estimators, since the measured line-of-sight velocity needs to be converted into the representative velocity of the BLR gas. The unknown virial factor has been empirically calibrated based on the $M_{BH}-{sigma}_*$ relation of non-AGN galaxies, but the claimed values are different by a factor of 2 in recent studies. We investigate the origin of the difference by measuring the $M_{BH}-{sigma}_*$ relation using the most updated nearby galaxy sample, and explore the dependence of the virial factor on the various fitting methods. We find that the discrepancy is mostly caused by the sample bias while the difference stemming from various regression methods is marginal. Based on the best-determined virial factor, we present the updated $M_{BH}-{sigma}_*$ relation of local active galaxies.