A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051

K. D. Denney; L. C. Watson; B. M. Peterson; R. W. Pogge; D. W. Atlee; M. C. Bentz; J. C. Bird; D. J. Brokofsky; M. L. Comins; M. Dietrich; V. T. Doroshenko; J. D. Eastman; Y. S. Efimov; C. M. Gaskell; C. H. Hedrick; S. A. Klimanov; E. S. Klimek; A. K. Kruse; J. B. Lamb; K. Leighly; T. Minezaki; S. V. Nazarov; E. A. Petersen; P. Peterson; S. Poindexter; Y. Schlesinger; K. J. Sakata; S. G. Sergeev; J. J. Tobin; C. Unterborn; Marianne Vestergaard; A. E. Watkins; Y. Yoshii

A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051

K. D. Denney, L. C. Watson, B. M. Peterson, R. W. Pogge, D. W. Atlee, M. C. Bentz, J. C. Bird, D. J. Brokofsky, M. L. Comins, M. Dietrich, V. T. Doroshenko, J. D. Eastman, Y. S. Efimov, C. M. Gaskell, C. H. Hedrick, S. A. Klimanov, E. S. Klimek, A. K. Kruse, J. B. Lamb, K. LeighlyT. Minezaki, S. V. Nazarov, E. A. Petersen, P. Peterson, S. Poindexter, Y. Schlesinger, K. J. Sakata, S. G. Sergeev, J. J. Tobin, C. Unterborn, Marianne Vestergaard, A. E. Watkins, Y. Yoshii

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Abstract

We present the first results from a high sampling rate, multimonth reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from telescopes around the world. The primary goal of this campaign was to obtain either new or improved Hß reverberation lag measurements for several relatively low luminosity active galactic nuclei (AGNs). We feature results for NGC 4051 here because, until now, this object has been a significant outlier from AGN scaling relationships, e.g., it was previously a ~2-3s outlier on the relationship between the broad-line region (BLR) radius and the optical continuum luminosity—the R BLR-L relationship. Our new measurements of the lag time between variations in the continuum and Hß emission line made from spectroscopic monitoring of NGC 4051 lead to a measured BLR radius of R BLR = 1.87+0.54 -0.50 light days and black hole mass of M BH = (1.73+0.55 -0.52) × 106 M sun. This radius is consistent with that expected from the R BLR-L relationship, based on the present luminosity of NGC 4051 and the most current calibration of the relation by Bentz et al.. We also present a preliminary look at velocity-resolved Hß light curves and time delay measurements, although we are unable to reconstruct an unambiguous velocity-resolved reverberation signal.

Original language	English
Journal	Astrophysical Journal
Volume	702
Issue number	2
Pages (from-to)	1353-1366
ISSN	0004-637X
Publication status	Published - 1 Sept 2009

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Denney, K. D., Watson, L. C., Peterson, B. M., Pogge, R. W., Atlee, D. W., Bentz, M. C., Bird, J. C., Brokofsky, D. J., Comins, M. L., Dietrich, M., Doroshenko, V. T., Eastman, J. D., Efimov, Y. S., Gaskell, C. M., Hedrick, C. H., Klimanov, S. A., Klimek, E. S., Kruse, A. K., Lamb, J. B., ... Yoshii, Y. (2009). A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051. Astrophysical Journal, 702(2), 1353-1366. http://adsabs.harvard.edu/abs/2009ApJ...702.1353D

Denney, KD, Watson, LC, Peterson, BM, Pogge, RW, Atlee, DW, Bentz, MC, Bird, JC, Brokofsky, DJ, Comins, ML, Dietrich, M, Doroshenko, VT, Eastman, JD, Efimov, YS, Gaskell, CM, Hedrick, CH, Klimanov, SA, Klimek, ES, Kruse, AK, Lamb, JB, Leighly, K, Minezaki, T, Nazarov, SV, Petersen, EA, Peterson, P, Poindexter, S, Schlesinger, Y, Sakata, KJ, Sergeev, SG, Tobin, JJ, Unterborn, C, Vestergaard, M, Watkins, AE & Yoshii, Y 2009, 'A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051', Astrophysical Journal, vol. 702, no. 2, pp. 1353-1366. <http://adsabs.harvard.edu/abs/2009ApJ...702.1353D>

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title = "A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051",

abstract = "We present the first results from a high sampling rate, multimonth reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from telescopes around the world. The primary goal of this campaign was to obtain either new or improved H{\ss} reverberation lag measurements for several relatively low luminosity active galactic nuclei (AGNs). We feature results for NGC 4051 here because, until now, this object has been a significant outlier from AGN scaling relationships, e.g., it was previously a ~2-3s outlier on the relationship between the broad-line region (BLR) radius and the optical continuum luminosity—the R BLR-L relationship. Our new measurements of the lag time between variations in the continuum and H{\ss} emission line made from spectroscopic monitoring of NGC 4051 lead to a measured BLR radius of R BLR = 1.87+0.54 -0.50 light days and black hole mass of M BH = (1.73+0.55 -0.52) × 106 M sun. This radius is consistent with that expected from the R BLR-L relationship, based on the present luminosity of NGC 4051 and the most current calibration of the relation by Bentz et al.. We also present a preliminary look at velocity-resolved H{\ss} light curves and time delay measurements, although we are unable to reconstruct an unambiguous velocity-resolved reverberation signal.",

author = "Denney, {K. D.} and Watson, {L. C.} and Peterson, {B. M.} and Pogge, {R. W.} and Atlee, {D. W.} and Bentz, {M. C.} and Bird, {J. C.} and Brokofsky, {D. J.} and Comins, {M. L.} and M. Dietrich and Doroshenko, {V. T.} and Eastman, {J. D.} and Efimov, {Y. S.} and Gaskell, {C. M.} and Hedrick, {C. H.} and Klimanov, {S. A.} and Klimek, {E. S.} and Kruse, {A. K.} and Lamb, {J. B.} and K. Leighly and T. Minezaki and Nazarov, {S. V.} and Petersen, {E. A.} and P. Peterson and S. Poindexter and Y. Schlesinger and Sakata, {K. J.} and Sergeev, {S. G.} and Tobin, {J. J.} and C. Unterborn and Marianne Vestergaard and Watkins, {A. E.} and Y. Yoshii",

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language = "English",

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pages = "1353--1366",

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TY - JOUR

T1 - A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051

AU - Denney, K. D.

AU - Watson, L. C.

AU - Peterson, B. M.

AU - Pogge, R. W.

AU - Atlee, D. W.

AU - Bentz, M. C.

AU - Bird, J. C.

AU - Brokofsky, D. J.

AU - Comins, M. L.

AU - Dietrich, M.

AU - Doroshenko, V. T.

AU - Eastman, J. D.

AU - Efimov, Y. S.

AU - Gaskell, C. M.

AU - Hedrick, C. H.

AU - Klimanov, S. A.

AU - Klimek, E. S.

AU - Kruse, A. K.

AU - Lamb, J. B.

AU - Leighly, K.

AU - Minezaki, T.

AU - Nazarov, S. V.

AU - Petersen, E. A.

AU - Peterson, P.

AU - Poindexter, S.

AU - Schlesinger, Y.

AU - Sakata, K. J.

AU - Sergeev, S. G.

AU - Tobin, J. J.

AU - Unterborn, C.

AU - Vestergaard, Marianne

AU - Watkins, A. E.

AU - Yoshii, Y.

PY - 2009/9/1

Y1 - 2009/9/1

N2 - We present the first results from a high sampling rate, multimonth reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from telescopes around the world. The primary goal of this campaign was to obtain either new or improved Hß reverberation lag measurements for several relatively low luminosity active galactic nuclei (AGNs). We feature results for NGC 4051 here because, until now, this object has been a significant outlier from AGN scaling relationships, e.g., it was previously a ~2-3s outlier on the relationship between the broad-line region (BLR) radius and the optical continuum luminosity—the R BLR-L relationship. Our new measurements of the lag time between variations in the continuum and Hß emission line made from spectroscopic monitoring of NGC 4051 lead to a measured BLR radius of R BLR = 1.87+0.54 -0.50 light days and black hole mass of M BH = (1.73+0.55 -0.52) × 106 M sun. This radius is consistent with that expected from the R BLR-L relationship, based on the present luminosity of NGC 4051 and the most current calibration of the relation by Bentz et al.. We also present a preliminary look at velocity-resolved Hß light curves and time delay measurements, although we are unable to reconstruct an unambiguous velocity-resolved reverberation signal.

AB - We present the first results from a high sampling rate, multimonth reverberation mapping campaign undertaken primarily at MDM Observatory with supporting observations from telescopes around the world. The primary goal of this campaign was to obtain either new or improved Hß reverberation lag measurements for several relatively low luminosity active galactic nuclei (AGNs). We feature results for NGC 4051 here because, until now, this object has been a significant outlier from AGN scaling relationships, e.g., it was previously a ~2-3s outlier on the relationship between the broad-line region (BLR) radius and the optical continuum luminosity—the R BLR-L relationship. Our new measurements of the lag time between variations in the continuum and Hß emission line made from spectroscopic monitoring of NGC 4051 lead to a measured BLR radius of R BLR = 1.87+0.54 -0.50 light days and black hole mass of M BH = (1.73+0.55 -0.52) × 106 M sun. This radius is consistent with that expected from the R BLR-L relationship, based on the present luminosity of NGC 4051 and the most current calibration of the relation by Bentz et al.. We also present a preliminary look at velocity-resolved Hß light curves and time delay measurements, although we are unable to reconstruct an unambiguous velocity-resolved reverberation signal.

M3 - Journal article

SN - 0004-637X

VL - 702

SP - 1353

EP - 1366

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

A Revised Broad-line Region Radius and Black Hole Mass for the Narrow-line Seyfert 1 NGC 4051

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