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Title: Reverberation mapping of the Seyfert 1 galaxy NGC 7469

Abstract

A large reverberation-mapping study of the Seyfert 1 galaxy NGC 7469 has yielded emission-line lags for Hβ λ4861 and He II λ4686 and a central black hole mass measurement M {sub BH} ≈ 1 × 10{sup 7} M {sub ☉}, consistent with previous measurements. A very low level of variability during the monitoring campaign precluded meeting our original goal of recovering velocity-delay maps from the data, but with the new Hβ measurement, NGC 7469 is no longer an outlier in the relationship between the size of the Hβ-emitting broad-line region and the luminosity of the active galactic nucleus. It was necessary to detrend the continuum and Hβ and He II λ4686 line light curves and those from archival UV data for different time-series analysis methods to yield consistent results.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3]; ;  [4];  [5];  [6];  [7];  [8] more »; « less
  1. Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States)
  2. SUPA Physics and Astronomy, University of St. Andrews, Fife KY16 9SS (United Kingdom)
  3. Department of Physics and Astronomy, Georgia State University, Astronomy Offices, 25 Park Place, Suite 605, Atlanta, GA 30303 (United States)
  4. Crimean Astrophysical Observatory, P/O Nauchny Crimea 298409 (Russian Federation)
  5. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978 (Israel)
  6. Institute of Astronomy, School of Science, University of Tokyo, 2-21-1, Osawa, Mitaka, 181-0015 Tokyo (Japan)
  7. Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center, Nashville, TN 37235 (United States)
  8. Department of Natural Sciences, The University of Michigan—Dearborn, 4901 Evergreen Road, Dearborn, MI 48128 (United States)
Publication Date:
OSTI Identifier:
22370033
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 795; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; EMISSION; GALAXIES; GALAXY NUCLEI; LUMINOSITY; MAPS; MASS; SPECTRA; TIME-SERIES ANALYSIS; VELOCITY; VISIBLE RADIATION

Citation Formats

Peterson, B. M., Grier, C. J., Pogge, R. W., De Rosa, G., Denney, K. D., Martini, Paul, Zu, Y., Kochanek, C. S., Shappee, B., Araya Salvo, C., Beatty, T. G., Bird, J. C., Horne, Keith, Bentz, M. C., Sergeev, S. G., Borman, G. A., Kaspi, S., Minezaki, T., Siverd, R. J., Bord, D. J., E-mail: peterson.12@osu.edu, and and others. Reverberation mapping of the Seyfert 1 galaxy NGC 7469. United States: N. p., 2014. Web. doi:10.1088/0004-637X/795/2/149.
Peterson, B. M., Grier, C. J., Pogge, R. W., De Rosa, G., Denney, K. D., Martini, Paul, Zu, Y., Kochanek, C. S., Shappee, B., Araya Salvo, C., Beatty, T. G., Bird, J. C., Horne, Keith, Bentz, M. C., Sergeev, S. G., Borman, G. A., Kaspi, S., Minezaki, T., Siverd, R. J., Bord, D. J., E-mail: peterson.12@osu.edu, & and others. Reverberation mapping of the Seyfert 1 galaxy NGC 7469. United States. doi:10.1088/0004-637X/795/2/149.
Peterson, B. M., Grier, C. J., Pogge, R. W., De Rosa, G., Denney, K. D., Martini, Paul, Zu, Y., Kochanek, C. S., Shappee, B., Araya Salvo, C., Beatty, T. G., Bird, J. C., Horne, Keith, Bentz, M. C., Sergeev, S. G., Borman, G. A., Kaspi, S., Minezaki, T., Siverd, R. J., Bord, D. J., E-mail: peterson.12@osu.edu, and and others. 2014. "Reverberation mapping of the Seyfert 1 galaxy NGC 7469". United States. doi:10.1088/0004-637X/795/2/149.
@article{osti_22370033,
title = {Reverberation mapping of the Seyfert 1 galaxy NGC 7469},
author = {Peterson, B. M. and Grier, C. J. and Pogge, R. W. and De Rosa, G. and Denney, K. D. and Martini, Paul and Zu, Y. and Kochanek, C. S. and Shappee, B. and Araya Salvo, C. and Beatty, T. G. and Bird, J. C. and Horne, Keith and Bentz, M. C. and Sergeev, S. G. and Borman, G. A. and Kaspi, S. and Minezaki, T. and Siverd, R. J. and Bord, D. J., E-mail: peterson.12@osu.edu and and others},
abstractNote = {A large reverberation-mapping study of the Seyfert 1 galaxy NGC 7469 has yielded emission-line lags for Hβ λ4861 and He II λ4686 and a central black hole mass measurement M {sub BH} ≈ 1 × 10{sup 7} M {sub ☉}, consistent with previous measurements. A very low level of variability during the monitoring campaign precluded meeting our original goal of recovering velocity-delay maps from the data, but with the new Hβ measurement, NGC 7469 is no longer an outlier in the relationship between the size of the Hβ-emitting broad-line region and the luminosity of the active galactic nucleus. It was necessary to detrend the continuum and Hβ and He II λ4686 line light curves and those from archival UV data for different time-series analysis methods to yield consistent results.},
doi = {10.1088/0004-637X/795/2/149},
journal = {Astrophysical Journal},
number = 2,
volume = 795,
place = {United States},
year = 2014,
month =
}
  • We present results of a reverberation mapping (RM) campaign on the low black hole mass narrow-line Seyfert 1 (NLS1) galaxy SDSS J113913.91+335551.1 (hereafter SL01). Using the H{beta} measurements, we find a time lag {tau}= 12.5{sup +0.5}{sub -11} days and a broad-line velocity width of 1450 km s{sup -1} which implies a black hole mass of 3.8{sup +0.6}{sub -2.8} Multiplication-Sign 10{sup 6} M{sub Sun }. To further bolster our time lag results, we employ a secondary method based on the multivariate correlation function as described in Chelouche and Zucker, in which case we obtain consistent lags for the Balmer lines, yetmore » without the need to spectrally deconvolve line from continuum emission processes. Given SL01's luminosity (L{sub bol} Almost-Equal-To 7 Multiplication-Sign 10{sup 43} erg s{sup -1}), we estimate an Eddington ratio (L{sub bol}/L{sub Edd}) of {approx}0.18. This fairly low-mass determination and rather high L{sub bol}/L{sub Edd} is consistent with the current paradigm that the nuclei of NLS1 galaxies host small black holes (as low as 10{sup 6} M{sub Sun }) with high accretion rates. SL01 is one of only a few NLS1s to date with robust RM results.« less
  • The Balmer emission lines in the gaseous envelope of the NGC 7469 nucleus have intensities and profiles that are variable on a time scale of approx. =20 days. At the base of the profile the H$alpha$ line is twice as narrow as H$gamma$. The hydrogen envelope of this Seyfert-galaxy nucleus is highly nonuniform in density. Flares occur in its dense inner portion. Emission is observed from that zone prior to a flare, but during the flare the emission comes from the more extended and rarefied part of the envelope. Some physical parameters are estimated for the dense inner part: radius,more » (1.6-5) x10$sup 16$ cm; electron density, (1-10) x10$sup 8$ cm$sup -3$; and electron temperature, (2- 3) x10$sup 4$degreeK. The opacity of the envelope in the Lyman-$alpha$ line is discussed. The intensity variations of the lambda3727 O II and O III N$sub 1$+N$sub 2$ lines indicate that the physical conditions are also variable in the forbidden-line emission zone. (AIP)« less
  • Image-tube spectrograms of high resolution were utilized to determine the velocity distribution within the central regions of NGC 7469. The observed velocity curves, some of which were asymmetric, largely reflect the rotation of the galaxy. A component of much smaller amplitude, attributed to radial motions, was also present. If distributed uniformly, the mass interior to 400 pc was about 10/sup 9/ M/sub sub solar /. A central mass condensation in excess of approximates 10/sup 8/ M/sub sub solar / seems to be excluded by the observations. The significance of these mass determinations in relation to models for Seyfert nuclei ismore » discussed. (auth) During the seventh flight of Stratoscope II, a 36-inch balloonborne telescope, ftve photographs of the nucleus of the Seyfert galaxy NGC 4151 as well as four equivalent photographs of a comparison star were obtained. These photographs show high definition and are well exposed. From a densitometric analysis a safe upper limit to the half- intensity diameter of the nucleus of 0.08'' is derived. This new upper limit is less than half the upper limit previously determined. (auth)« less
  • The results of a search for 2.12-micron H2 1-0 S(1) line emission from the nuclear (not greater than 1 kpc) region in 11 active galaxies are reported. The galaxies observed included type 1 and type 2 Seyferts, LINERs, and starburst nucleus galaxies. H2 emission was detected in one galaxy, the classical type 1 Seyfert NGC 7469. Also reported is the detection of very luminous C-12O 2.6-mm emission from NGC 7469, and optical narrow-band images and long-slit spectroscopy data concerning the ionized gas in this galaxy are presented. These data imply that NGC 7469 not only contains a highly active compactmore » nucleus but also is undergoing a luminous circumnuclear (few-kpc scale) starburst. Most of the other galaxies with known H2 emission also seem to be composite monster/starburst systems and/or interacting galaxies. This result may arise because the molecular gas is associated with the starburst, while the primary form of the mechanical energy necessary to shock-excite the H2 is either outflow (possibly a wind) driven by the compact active nucleus or noncircular motions of gravitational origin. In either case, high-velocity (greater than 300 km/s) collisions between dense molecular clouds and a more ubiquitous, less dense gas phase can drive slow (10-30 km/s) shocks into the molecular clouds, exciting the observed H2 emission. 68 references.« less