The Mass of the Central Black Hole in the Seyfert Galaxy NGC 4151

2); (2) Department of Mechanical Engineering; 3); (3) NRC Herzberg Institute of Astrophysics); Bradley M. Peterson (1) ((1) Department of Astronomy; Christopher A. Onken (1; Kyle G. Metzroth (1; The Ohio State University

arxiv: astro-ph/0605038 · v1 · pith:QYJXOWF5new · submitted 2006-05-01 · 🌌 astro-ph

The Mass of the Central Black Hole in the Seyfert Galaxy NGC 4151

Kyle G. Metzroth (1 , 2) , Christopher A. Onken (1 , 3) , Bradley M. Peterson (1) ((1) Department of Astronomy , The Ohio State University , (2) Department of Mechanical Engineering , (3) NRC Herzberg Institute of Astrophysics) This is my paper

classification 🌌 astro-ph

keywords masscentralblackcampaignsgalaxyholemassesmeasure

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In order to improve the reverberation-mapping based estimate of the mass of the central supermassive black hole in the Seyfert 1 galaxy NGC 4151, we have reanalyzed archival ultraviolet monitoring spectra from two campaigns undertaken with the International Ultraviolet Explorer. We measure emission-line time delays for four lines, C IV 1549, He II 1640, C III] 1909, and Mg II 2798, from both campaigns. We combine these measurements with the dispersion of the variable part of each respective emission line to obtain the mass of the central object. Despite the problematic nature of some of the data, we are able to measure a mass of 41.1 (+/- 7.3) million solar masses, although this, like all reverberation-based masses, is probably systematically uncertain by a factor of 3-4.

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Reverberation in the Narrow Fe K${\alpha}$ Line in the Seyfert Galaxy NGC 4151 with XRISM
astro-ph.HE 2026-06 unverdicted novelty 6.0

XRISM multi-epoch spectra of NGC 4151 yield a 3.5-day lag in the narrow Fe Kα line flux, consistent with a broad-line-region origin and giving M_BH/f_X ≈ 2×10^7 solar masses.