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Intra-day variability of three Seyfert galaxies measured with XMM-Newton
Tripathi Ashutosh1; Wiita Paul Joseph2; Gupta Alok Chandra4; Gu MinFeng5; Liao Mai5
2019
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume19Issue:8
AbstractWe present and analyze the variability of three Seyfert galaxies on intra-day timescales. We have analyzed in a uniform manner the 38 longest (> 30 ks) observations made for NGC 4051, MCG-06-30-15 and NGC 4151 by XMM-Newton between 2000 and 2015. The nuclei were quite active during essentially all of these observations and the overall X-ray fluxes (0.3-10 keV) varied by an order of magnitude. Most of the observations do appear to show characteristic timescales, estimated through their auto-correlation functions, ranging between similar to 2.9 ks and similar to 45.3 ks. The hard (2-10 keV) and soft (0.3-2.0 keV) bands are very well correlated but consideration of their hardness ratios shows that the sources typically soften during flares. We also provide new estimates of the central black hole masses for these three AGNs that support the hypothesis that Narrow Line Seyfert 1 galaxies have relatively small central black holes.
KeywordX-RAY VARIABILITY ACTIVE GALACTIC NUCLEI BLACK-HOLE MASSES PHOTON IMAGING CAMERA BROAD-LINE REGION SPECTRAL VARIABILITY OPTICAL VARIABILITY NGC 4051 ULTRAVIOLET LONG galaxies: active narrow line Seyfert 1 galaxy (NLSy1): general NLSy1: individual NLSy1: individual: NGC 4051
Language英语
Funding Project[National Aeronautics and Space Administration] ; [China Scholarship Council (CSC)] ; [Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI)] ; [National Natural Science Foundation of China] ; [Science and Technology Commission of Shanghai Municipality] ; [NASA]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/70698
Collection中国科学院国家天文台
Affiliation1.复旦大学
2.Coll New Jersey, Department Phys, POB 7718, Ewing, NJ 08628 USA
3.SLAC, Kavli Institute Particle Phys & Cosmol, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA
4.Aryabhatta Res Institute Observat Sci ARIES, Manora Peak 263002, Nainital, India
5.中国科学院国家天文台
6.中国科学院大学
Recommended Citation
GB/T 7714
Tripathi Ashutosh,Wiita Paul Joseph,Gupta Alok Chandra,et al. Intra-day variability of three Seyfert galaxies measured with XMM-Newton[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(8).
APA Tripathi Ashutosh,Wiita Paul Joseph,Gupta Alok Chandra,Gu MinFeng,&Liao Mai.(2019).Intra-day variability of three Seyfert galaxies measured with XMM-Newton.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(8).
MLA Tripathi Ashutosh,et al."Intra-day variability of three Seyfert galaxies measured with XMM-Newton".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.8(2019).
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