A low-mass black hole in the nearby Seyfert galaxy UGC 06728

Journal Article · Tue Nov 01 00:00:00 EDT 2016 · Astrophysical Journal

DOI:https://doi.org/10.3847/0004-637X/831/1/2· OSTI ID:22868557

Bentz, Misty C.; Batiste, Merida; Seals, James; Garcia, Karen; Naray, Rachel Kuzio de; Peters, Wesley; Anderson, Matthew D.; Jones, Jeremy; Lester, Kathryn; Machuca, Camilo; Parks, J. Robert; Pope, Crystal L.; Revalski, Mitchell; Roberts, Caroline A.; Saylor, Dicy; Sevrinsky, R. Andrew; Turner, Clay ^[1]

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1. Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303 (United States)

We present the results of a recent reverberation mapping campaign for UGC 06728, a nearby low-luminosity Seyfert 1 in a late-type galaxy. Nightly monitoring in the spring of 2015 allowed us to determine an Hβ time delay of τ=1.4±0.8 days. Combined with the width of the variable Hβ line profile, we determine a black hole mass of M{sub BH}=(7.1±4.0)×10{sup 5} M{sub ⊙}. We also constrain the bulge stellar velocity dispersion from higher-resolution long-slit spectroscopy along the galaxy minor axis and find σ{sub ⋆}=51.6±4.9 km s{sup −1}. The measurements presented here are in good agreement with both the R{sub BLR}--L relationship and the M{sub BH}--σ{sub ⋆} relationship for active galactic nuclei. Combined with a previously published spin measurement, our mass determination for UGC 06728 makes it the lowest-mass black hole that has been fully characterized, and thus an important object to help anchor the low-mass end of black hole evolutionary models.

• OSTI ID: 22868557
• Journal Information: Astrophysical Journal, Vol. 831, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BLACK HOLES
DISPERSIONS
GALAXY NUCLEI
LUMINOSITY
MASS
SEYFERT GALAXIES
SPECTROSCOPY
TIME DELAY
VELOCITY