Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

B. M. Peterson; P. Berlind; R. Bertram; N. G. Bochkarev; D. Bond; M. S. Brotherton; J. R. Busler; K. K. Chuvaev; R. D. Cohen; M. Dietrich; M. Elvis; A. V. Filippenko; C. B. Foltz; P. M. Garnavich; L. C. Ho; E. Horine; K. Horne; J. P. Huchra; W. Kollatschny; K. T. Korista; M. A. Malkan; T. Matheson; M. Mlgnoli; S. L. Morris; L. Nazarova; J. Pent-Old; J. Peters; R. W. Pogge; V. I. Pronik; B. Rush; S. G. Sergeev; A. I. Shapovalova; J. C. Shields; G. M. Stirpe; S. Tokarz; R. M. Wagner; R. J. Weymann; R. J. White; B. J. Wilkes; D. Wills; B. J. Wills; C. Winge; P. F. Younger

doi:10.1086/174009

Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

B. M. Peterson
, P. Berlind
, R. Bertram
, N. G. Bochkarev
, D. Bond
, M. S. Brotherton
, J. R. Busler
, K. K. Chuvaev
, R. D. Cohen
, M. Dietrich
, M. Elvis
, A. V. Filippenko
, C. B. Foltz
, P. M. Garnavich
, L. C. Ho
, E. Horine
, K. Horne
, J. P. Huchra
, W. Kollatschny
, K. T. Korista

M. A. Malkan, T. Matheson, M. Mlgnoli, S. L. Morris, L. Nazarova, J. Pent-Old, J. Peters, R. W. Pogge, V. I. Pronik, B. Rush, S. G. Sergeev, A. I. Shapovalova, J. C. Shields, G. M. Stirpe, S. Tokarz, R. M. Wagner, R. J. Weymann, R. J. White, B. J. Wilkes, D. Wills, B. J. Wills, C. Winge, P. F. Younger

Steward Observatory

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

We report on the results of a continuation of a large monitoring program of optical spectroscopy of the Seyfert 1 galaxy NGC 5548. The new observations presented here were obtained between 1990 December and 1992 October, and extend the existing database to nearly 1400 days, dating back to 1988 December. The continuum variations are generally smooth and well-resolved, except during the third year of this 4 year project, when the variations were apparently more rapid and of lower amplitude than observed at other times. The broad Hβ emission line is found to vary in response to the continuum variations with a lag of about 18 days, but with some changes from year to year. The Hβ transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.

Original language	English (US)
Pages (from-to)	622-634
Number of pages	13
Journal	Astrophysical Journal
Volume	425
Issue number	2
DOIs	https://doi.org/10.1086/174009
State	Published - Apr 20 1994

Keywords

Galaxies: active
Galaxies: individual (NGC 5548)
Galaxies: nuclei
Galaxies: Seyfert

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/174009

Cite this

Peterson, B. M., Berlind, P., Bertram, R., Bochkarev, N. G., Bond, D., Brotherton, M. S., Busler, J. R., Chuvaev, K. K., Cohen, R. D., Dietrich, M., Elvis, M., Filippenko, A. V., Foltz, C. B., Garnavich, P. M., Ho, L. C., Horine, E., Horne, K., Huchra, J. P., Kollatschny, W., ... Younger, P. F. (1994). Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years. Astrophysical Journal, 425(2), 622-634. https://doi.org/10.1086/174009

Peterson, BM, Berlind, P, Bertram, R, Bochkarev, NG, Bond, D, Brotherton, MS, Busler, JR, Chuvaev, KK, Cohen, RD, Dietrich, M, Elvis, M, Filippenko, AV, Foltz, CB, Garnavich, PM, Ho, LC, Horine, E, Horne, K, Huchra, JP, Kollatschny, W, Korista, KT, Malkan, MA, Matheson, T, Mlgnoli, M, Morris, SL, Nazarova, L, Pent-Old, J, Peters, J, Pogge, RW, Pronik, VI, Rush, B, Sergeev, SG, Shapovalova, AI, Shields, JC, Stirpe, GM, Tokarz, S, Wagner, RM, Weymann, RJ, White, RJ, Wilkes, BJ, Wills, D, Wills, BJ, Winge, C & Younger, PF 1994, 'Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years', Astrophysical Journal, vol. 425, no. 2, pp. 622-634. https://doi.org/10.1086/174009

@article{dee53d02749e4103a2d5bfc1a0dc5f79,

title = "Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years",

abstract = "We report on the results of a continuation of a large monitoring program of optical spectroscopy of the Seyfert 1 galaxy NGC 5548. The new observations presented here were obtained between 1990 December and 1992 October, and extend the existing database to nearly 1400 days, dating back to 1988 December. The continuum variations are generally smooth and well-resolved, except during the third year of this 4 year project, when the variations were apparently more rapid and of lower amplitude than observed at other times. The broad Hβ emission line is found to vary in response to the continuum variations with a lag of about 18 days, but with some changes from year to year. The Hβ transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.",

keywords = "Galaxies: active, Galaxies: individual (NGC 5548), Galaxies: nuclei, Galaxies: Seyfert",

author = "Peterson, \{B. M.\} and P. Berlind and R. Bertram and Bochkarev, \{N. G.\} and D. Bond and Brotherton, \{M. S.\} and Busler, \{J. R.\} and Chuvaev, \{K. K.\} and Cohen, \{R. D.\} and M. Dietrich and M. Elvis and Filippenko, \{A. V.\} and Foltz, \{C. B.\} and Garnavich, \{P. M.\} and Ho, \{L. C.\} and E. Horine and K. Horne and Huchra, \{J. P.\} and W. Kollatschny and Korista, \{K. T.\} and Malkan, \{M. A.\} and T. Matheson and M. Mlgnoli and Morris, \{S. L.\} and L. Nazarova and J. Pent-Old and J. Peters and Pogge, \{R. W.\} and Pronik, \{V. I.\} and B. Rush and Sergeev, \{S. G.\} and Shapovalova, \{A. I.\} and Shields, \{J. C.\} and Stirpe, \{G. M.\} and S. Tokarz and Wagner, \{R. M.\} and Weymann, \{R. J.\} and White, \{R. J.\} and Wilkes, \{B. J.\} and D. Wills and Wills, \{B. J.\} and C. Winge and Younger, \{P. F.\}",

year = "1994",

month = apr,

day = "20",

doi = "10.1086/174009",

language = "English (US)",

volume = "425",

pages = "622--634",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

AU - Peterson, B. M.

AU - Berlind, P.

AU - Bertram, R.

AU - Bochkarev, N. G.

AU - Bond, D.

AU - Brotherton, M. S.

AU - Busler, J. R.

AU - Chuvaev, K. K.

AU - Cohen, R. D.

AU - Dietrich, M.

AU - Elvis, M.

AU - Filippenko, A. V.

AU - Foltz, C. B.

AU - Garnavich, P. M.

AU - Ho, L. C.

AU - Horine, E.

AU - Horne, K.

AU - Huchra, J. P.

AU - Kollatschny, W.

AU - Korista, K. T.

AU - Malkan, M. A.

AU - Matheson, T.

AU - Mlgnoli, M.

AU - Morris, S. L.

AU - Nazarova, L.

AU - Pent-Old, J.

AU - Peters, J.

AU - Pogge, R. W.

AU - Pronik, V. I.

AU - Rush, B.

AU - Sergeev, S. G.

AU - Shapovalova, A. I.

AU - Shields, J. C.

AU - Stirpe, G. M.

AU - Tokarz, S.

AU - Wagner, R. M.

AU - Weymann, R. J.

AU - White, R. J.

AU - Wilkes, B. J.

AU - Wills, D.

AU - Wills, B. J.

AU - Winge, C.

AU - Younger, P. F.

PY - 1994/4/20

Y1 - 1994/4/20

N2 - We report on the results of a continuation of a large monitoring program of optical spectroscopy of the Seyfert 1 galaxy NGC 5548. The new observations presented here were obtained between 1990 December and 1992 October, and extend the existing database to nearly 1400 days, dating back to 1988 December. The continuum variations are generally smooth and well-resolved, except during the third year of this 4 year project, when the variations were apparently more rapid and of lower amplitude than observed at other times. The broad Hβ emission line is found to vary in response to the continuum variations with a lag of about 18 days, but with some changes from year to year. The Hβ transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.

AB - We report on the results of a continuation of a large monitoring program of optical spectroscopy of the Seyfert 1 galaxy NGC 5548. The new observations presented here were obtained between 1990 December and 1992 October, and extend the existing database to nearly 1400 days, dating back to 1988 December. The continuum variations are generally smooth and well-resolved, except during the third year of this 4 year project, when the variations were apparently more rapid and of lower amplitude than observed at other times. The broad Hβ emission line is found to vary in response to the continuum variations with a lag of about 18 days, but with some changes from year to year. The Hβ transfer functions for each of the 4 yr and for the entire 4 yr database are derived by using a maximum entropy method.

KW - Galaxies: active

KW - Galaxies: individual (NGC 5548)

KW - Galaxies: nuclei

KW - Galaxies: Seyfert

UR - https://www.scopus.com/pages/publications/12044258978

UR - https://www.scopus.com/pages/publications/12044258978#tab=citedBy

U2 - 10.1086/174009

DO - 10.1086/174009

M3 - Article

AN - SCOPUS:12044258978

SN - 0004-637X

VL - 425

SP - 622

EP - 634

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. VII. Variability of the optical spectrum of NGC 5548 over 4 years

Abstract

Keywords

ASJC Scopus subject areas

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