A Reverberation‐based Mass for the Central Black Hole in NGC 4151

Bentz, Misty C.; Denney, K. D.; Cackett, Edward M.; Dietrich, M.; Fogel, Jeffrey K. J.; Ghosh, H.; Horne, K.; Kuehn, Charles A.; Minezaki, Takeo; Onken, Christopher A.; Peterson, B. M.; Pogge, Richard W.; Pronik, V. I.; Richstone, D. O.; Сергеев, С. Г.; Vestergaard, M.; Walker, Matthew G.; Yoshii, Yuzuru

doi:10.1086/507417

Cited by 207 publications

(235 citation statements)

References 39 publications

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“…The problems of small sample size and relatively larger uncertainties for lower luminosity objects will soon be mitigated by two independent reverberation-mapping campaigns which have been recently carried out at MDM Observatory and at Lick Observatory and targeted the lowluminosity end of the relationship. Preliminary results from the MDM campaign promise to replace several measurements, as was done in the case of NGC 4593 (Denney et al 2006) and NGC 4151 (Bentz et al 2006b) in the 2005 MDM campaign. And preliminary results from the Lick campaign promise to add several new objects to the low-luminosity end of the R BLR -L relationship (e.g., Bentz et al 2008).…”

Section: Discussionmentioning

confidence: 88%

“…In addition, the Kaspi et al (1996) data set has a rather unconstrained time lag that is consistent with zero once the monotonic increase in the continuum and line flux is removed (see Metzroth et al 2006 for a full discussion). Both of these data sets for NGC 4151 have been superseded by the results reported by Bentz et al (2006b), which we include here in their stead.…”

Section: Flux Measurementsmentioning

confidence: 99%

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THE RADIUS-LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI: THE EFFECT OF HOST-GALAXY STARLIGHT ON LUMINOSITY MEASUREMENTS. II. THE FULL SAMPLE OF REVERBERATION-MAPPED AGNs

Bentz¹,

Peterson²,

Netzer³

et al. 2009

ApJ

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608

808

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We present high-resolution Hubble Space Telescope images of all 35 active galactic nuclei (AGNs) with optical reverberation-mapping results, which we have modeled to create a nucleus-free image of each AGN host galaxy. From the nucleus-free images, we determine the host-galaxy contribution to ground-based spectroscopic luminosity measurements at 5100 Å. After correcting the luminosities of the AGNs for the contribution from starlight, we re-examine the Hβ R BLR -L relationship. Our best fit for the relationship gives a power-law slope of 0.52 with a range of 0.45-0.59 allowed by the uncertainties. This is consistent with our previous findings, and thus still consistent with the naive assumption that all AGNs are simply luminosity-scaled versions of each other. We discuss various consistency checks relating to the galaxy modeling and starlight contributions, as well as possible systematic errors in the current set of reverberation measurements from which we determine the form of the R BLR -L relationship.

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Section: Discussionmentioning

confidence: 88%

Section: Flux Measurementsmentioning

confidence: 99%

THE RADIUS-LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI: THE EFFECT OF HOST-GALAXY STARLIGHT ON LUMINOSITY MEASUREMENTS. II. THE FULL SAMPLE OF REVERBERATION-MAPPED AGNs

Bentz¹,

Peterson²,

Netzer³

et al. 2009

ApJ

Self Cite

608

808

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show abstract

“…It is important to note that the FM values for D+Ea are slightly offset from the predicted curve, since they were generated using a filtered continuum. For a SMBH mass of M BH = 4.57 × 10 7 M ⊙ (Bentz et al 2006), we determined the Eddington luminosity, L Edd = 5.78 × 10 45 erg s −1 . Based on our determination of the 2-10 keV source luminosity (L 2−10keV ), and by assuming a bolometric correction of ∼ 30 (Awaki et al 2001), we calculated the bolometric luminosity for our studied epochs.…”

Section: Discussionmentioning

confidence: 99%

New Insights Into the Spectral Variability and Physical Conditions of the X-Ray Absorbers in NGC 4151

Couto

Kraemer

Turner

et al. 2016

ApJ

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We investigate the relationship between the long term X-ray spectral variability in the Seyfert 1.5 galaxy NGC 4151 and its intrinsic absorption, by comparing the 2014 simultaneous ultraviolet/XRay observations taken with Hubble STIS Echelle and Chandra HETGS with archival observations from Chandra, XMM-Newton and Suzaku. The observations are divided into "high" and "low" states, with the low states showing strong and unabsorbed extended emission at energies below 2 keV. Our X-ray model consists of a broken powerlaw, neutral reflection and the two dominant absorption components identified by Kraemer et al. (2005), hereafter KRA2005, X-High and D+Ea, which are present in all epochs. The model fittings suggest that the absorbers are very stable, with the principal changes in the intrinsic absorption resulting from variations in the ionization state of the gas as the ionizing continuum varies. However, the low states show evidence of larger column densities in one or both of the absorbers. Among plausible explanations for the column increase, we discuss the possibility of an expanding/contracting X-ray corona. As suggested by KRA2005, there seem to be contributions from magnetohydrodynamic (MHD) winds to the mass outflow. Along with the ultra fast outflow absorber identified by Tombesi et al. (2010), X-High is consistent with being magnetically driven. On the other hand, it is unlikely that D+Ea is part of the MHD flow, and it is possible that it is radiatively accelerated. These results suggest that at a sufficiently large radial distance there is a break point between MHD-dominated and radiatively driven outflows.

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“…It is revealed that, the BLR size as measured for a particular emission line such as Hβ λ4861, is closely related to the AGN luminosity in the approximate form R ∝ L 1/2 (the R-L relation; e.g., Kaspi et al 2000;Bentz et al 2006;Shen & Liu 2012). This relation offers the possibility of taking advantage of single-epoch (SE) spectra to determine the SMBH masses (e.g., Vestergaard 2002;McLure & Jarvis 2002;Vestergaard & Peterson 2006).…”

Section: Introductionmentioning

confidence: 99%

Relation between the Variations in the Mg ii λ2798 Emission Line and 3000 Å Continuum

Zhu

Wang

2017

ApJ

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We investigate the relationship between the Mg ii λ2798 emission-line and the 3000Å continuum variations using a sample of 68 intermediate-redshift (z ∼ 0.65−1.50) broad-line quasars spanning a bolometric luminosity range of 44.49 erg s −1 ≤ logL bol ≤ 46.31 erg s −1 (Eddington ratio from ∼ 0.026 to 0.862). This sample is constructed from SDSS-DR7Q and BOSS-DR12Q, each with at least 2 spectroscopic epochs in SDSS-I/II/III surveys. Additionally, we adopt the following signalto-noise ratio (S/N) selection criteria: a) for Mg ii and the 3000Å continuum, S/N ≥ 10; b) for narrow lines, S/N ≥ 5. All our quasar spectra are recalibrated based on the assumption of constant narrow emission-line fluxes. In an analysis of spectrum-to-spectrum variations, we find a fairly close correlation (Spearman ρ = 0.593) between the variations in broad Mg ii and in the continuum. This is consistent with the idea that Mg ii is varying in response to the continuum emission variations. Adopting the modified weighted least squares regression method, we statistically constrain the slopes (i.e., the responsivity α of the broad Mg ii) between the variations in both components for the sources in different luminosity bins after eliminating intrinsic biases introduced by the rescaling process itself. It is shown that the responsivity is quite small (averageᾱ ≈ 0.464) and anti-correlates with the quasar luminosity. Our results indicate that high signal-to-noise flux measurements are required to robustly detect the intrinsic variability and the time lag of Mg ii line.

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A Reverberation‐based Mass for the Central Black Hole in NGC 4151

Cited by 207 publications

References 39 publications

THE RADIUS-LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI: THE EFFECT OF HOST-GALAXY STARLIGHT ON LUMINOSITY MEASUREMENTS. II. THE FULL SAMPLE OF REVERBERATION-MAPPED AGNs

THE RADIUS-LUMINOSITY RELATIONSHIP FOR ACTIVE GALACTIC NUCLEI: THE EFFECT OF HOST-GALAXY STARLIGHT ON LUMINOSITY MEASUREMENTS. II. THE FULL SAMPLE OF REVERBERATION-MAPPED AGNs

New Insights Into the Spectral Variability and Physical Conditions of the X-Ray Absorbers in NGC 4151

Relation between the Variations in the Mg ii λ2798 Emission Line and 3000 Å Continuum

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