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Title: Intra-day variability of three Seyfert galaxies measured with XMM-Newton

Abstract

We 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 ~2.9 ks and ~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.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Fudan Univ., Shanghai (China). Center for Field Theory and Particle Physics and Dept. of Physics
  2. The College of New Jersey, Ewing, NJ (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Institute for Particle Physics and Cosmology
  3. Aryabhatta Research Inst. of Observational Sciences (ARIES), Manora Peak (India); Chinese Academy of Sciences, Shanghai (China). Key Lab. for Research in Galaxies and Cosmology
  4. Chinese Academy of Sciences, Shanghai (China). Key Lab. for Research in Galaxies and Cosmology
  5. Chinese Academy of Sciences, Shanghai (China). Key Lab. for Research in Galaxies and Cosmology; Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1562505
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Research in Astronomy and Astrophysics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 8; Journal ID: ISSN 1674-4527
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Tripathi, Ashutosh, Joseph Wiita, Paul, Chandra Gupta, Alok, Gu, Min-Feng, and Liao, Mai. Intra-day variability of three Seyfert galaxies measured with XMM-Newton. United States: N. p., 2019. Web. doi:10.1088/1674-4527/19/8/109.
Tripathi, Ashutosh, Joseph Wiita, Paul, Chandra Gupta, Alok, Gu, Min-Feng, & Liao, Mai. Intra-day variability of three Seyfert galaxies measured with XMM-Newton. United States. doi:10.1088/1674-4527/19/8/109.
Tripathi, Ashutosh, Joseph Wiita, Paul, Chandra Gupta, Alok, Gu, Min-Feng, and Liao, Mai. Thu . "Intra-day variability of three Seyfert galaxies measured with XMM-Newton". United States. doi:10.1088/1674-4527/19/8/109.
@article{osti_1562505,
title = {Intra-day variability of three Seyfert galaxies measured with XMM-Newton},
author = {Tripathi, Ashutosh and Joseph Wiita, Paul and Chandra Gupta, Alok and Gu, Min-Feng and Liao, Mai},
abstractNote = {We 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 ~2.9 ks and ~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.},
doi = {10.1088/1674-4527/19/8/109},
journal = {Research in Astronomy and Astrophysics},
number = 8,
volume = 19,
place = {United States},
year = {2019},
month = {8}
}

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