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A BAYESIAN APPROACH TO ESTIMATE THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI USING REVERBERATION MAPPING DATA
Yan R(彦荣); Wang JM(王建民); Li, YR; Wang, JM; Ho, LC; Du, P; Bai, JM; Du P(杜璞)
2013
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
EISSN1538-4357
Volume779Issue:2Pages:110
AbstractThis is the first paper in a series devoted to the systematic study of the size and structure of the broad-line region (BLR) in active galactic nuclei (AGNs) using reverberation mapping (RM) data. We employ a recently developed Bayesian approach that statistically describes the variability as a damped random walk process and delineates the BLR structure using a flexible disk geometry that can account for a variety of shapes, including disks, rings, shells, and spheres. We allow for the possibility that the line emission may respond non-linearly to the continuum, and we detrend the light curves when there is clear evidence for secular variation. We use a Markov Chain Monte Carlo implementation based on Bayesian statistics to recover the parameters and uncertainties for the BLR model. The corresponding transfer function is obtained self-consistently. We tentatively constrain the virial factor used to estimate black holemasses; more accurate determinations will have to await velocity-resolved RM data. Application of our method to RM data with H beta monitoring for about 40 objects shows that the assumed BLR geometry can reproduce quite well the observed emission-line fluxes from the continuum light curves. We find that the H beta BLR sizes obtained from our method are on average similar to 20% larger than those derived from the traditional cross-correlation method. Nevertheless, we still find a tight BLR size-luminosity relation with a slope of alpha = 0.55 +/- 0.03 and an intrinsic scatter of similar to 0.18 dex. In particular, we demonstrate that our approach yields appropriate BLR sizes for some objects (such as Mrk 142 and PG 2130+099) where traditional methods previously encountered difficulties.
Keywordgalaxies: active methods: data analysis methods: statistical quasars: general
Subject AreaAstronomy & Astrophysics
DOI10.1088/0004-637X/779/2/110
Indexed BySCI ; INSPIREHEP ; ADS
Language英语
WOS IDWOS:000328187200020
ADS Bibcode2013ApJ...779..110L
ADS URLhttps://ui.adsabs.harvard.edu/abs/2013ApJ...779..110L
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2013ApJ...779..110L/citations
inspireid1258572
inspireURLhttps://inspirehep.net/literature/1258572
Citation statistics
Cited Times:25 [INSPIRE]
Cited Times:68 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/224421
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
Yan R,Wang JM,Li, YR,et al. A BAYESIAN APPROACH TO ESTIMATE THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI USING REVERBERATION MAPPING DATA[J]. ASTROPHYSICAL JOURNAL,2013,779(2):110.
APA 彦荣.,王建民.,Li, YR.,Wang, JM.,Ho, LC.,...&杜璞.(2013).A BAYESIAN APPROACH TO ESTIMATE THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI USING REVERBERATION MAPPING DATA.ASTROPHYSICAL JOURNAL,779(2),110.
MLA 彦荣,et al."A BAYESIAN APPROACH TO ESTIMATE THE SIZE AND STRUCTURE OF THE BROAD-LINE REGION IN ACTIVE GALACTIC NUCLEI USING REVERBERATION MAPPING DATA".ASTROPHYSICAL JOURNAL 779.2(2013):110.
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