천문학회지 (Journal of The Korean Astronomical Society)

  • 제35권1호
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  • Pages.1-7
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  • 2002
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  • 1225-4614(pISSN)
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  • 2288-890X(eISSN)
한국천문학회 (The Korean Astronomical Society)
권호 표지
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LONG-TERM X-RAY VARIABILITIES OF THE SEYFERT GALAXY MCG-2-58-22 : SECULAR FLUX DECREASE AND FLARES

  • 발행 : 2002.03.01
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초록

We have studied the long-term X-ray light curve (2-10 keV) of the luminous Seyfert 1 galaxy MCG-2-58-22 by compiling data, from various X-ray satellites, which together cover more than 20 years. We have found two distinct types of time variations in the light curve. One is a gradual and secular decrease of the X-ray flux, and the other is the episodic increase of X-ray flux (or flare) by a factor of 2-4 compared with the level expected from the secular variation. We detected 3 such flares in total; a representative duration for the flares is $\~$2 years, with intervening quiescent intervals lasting $\~$6-8 years. We discuss a few possible origins for these variabilities. Though a standard disk instability theory may explain the displayed time variability in the X-ray light curve, the subsequent accretions of stellar debris, from a tidal disruption event caused by a supermassive black hole in MCG-2-58-22, cannot be ruled out as an alternative explanation.

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참고문헌

  1. A&A v.309 Detection of an Extremely Soft X-ray Outburst in HII-like Nucleus of NGC 5905 Bade, N.;Komossa, S.;Dahlem, M.
  2. Nature v.320 Limits of X-ray Variability in Active Galactic Nuclei Barr, P.;Mushotzky, R. F https://doi.org/10.1038/320421a0
  3. MNRAS v.259 Angular Momentum of Supermassive Black Hole in a Dense Star Cluster Beloborodov, A. M.;Illarionov, A. F.;Ivanov, P, B.;Polnarev, A. G. https://doi.org/10.1093/mnras/259.2.209
  4. MNRAS v.273 The Unusual X-ray and Optical properties of the Ultrasoft Active Galactic Nucleus Zwicky 159.034 Brandt, W. N.;Pounds, K. A.;Fink, H. https://doi.org/10.1093/mnras/273.1.L47
  5. A&A v.121 Tidal Compression of a Star by a Large Black Hole Carter, B.;Luminet, J. Pl
  6. JKAS v.34 X-ray Archival Data Analysis of Time Variabilities in Seyfert Galaxy MCG-2-58-22 Choi, C. S.;Dotani, T.;Yi, I.;Fletcher, A.;Kim, C
  7. A&AS v.63 Optical Variability of Seyfert Nuclei. I. VABLUW Photometry de Ruiter, H. R.;Lub, J.
  8. ApJS v.114 ASCA Observations of Seyfert Galaxies. Ⅲ. The Evidence for Absorption and Emission Due to Photoionized Gas George, I. M.;Turner, T. J.;Netzer, H.;Nandra, K.;Mushotzky, R. F;Yaqoob, T. https://doi.org/10.1086/313067
  9. ApJ v.398 X-ray Observations of the Seyfert Galaxy MCG-2-58-22 Ghosh, K. K.;Soundararajaperurnal, S. https://doi.org/10.1086/171873
  10. ApJ v.230 The Einstein /HEAO-2/ X-ray Observatory Gaiacconi, R.(et al.) https://doi.org/10.1086/157110
  11. ApJS v.82 X-ray Luminosity and Spectral Variability of Hard X-ray-Selected Active Galactic Nuclei Grandi, P.;Tagliaferri, G.;Giommi, P.;Barr, P.;Palumbo, G. G. C. https://doi.org/10.1086/191710
  12. ApJ v.500 Central Black Hole Masses in Active Galactic Nuclei Inferred from X-ray Variability Hayashida, K.;Miyamoto, S.;Kitamoto, S.;Negoro, H.;Inoue, H. https://doi.org/10.1086/305736
  13. AJ v.105 The Morphological Catalogue of Galaxies Equatorial Survey Huchra, J.;Latham, D. W.;Costa, L. N.;Pellegrini, P. S.;Willmer, C. N. A. https://doi.org/10.1086/116543
  14. ApJ v.519 The Stream-Stream Collision after the Tidal Disruption of a Star around a Massive Black Hole Kim, S. S.;Park, M. -G.;Lee, H. -M. https://doi.org/10.1086/307394
  15. A&A v.343 The Giant X-ray Outburst in NGC 5905 and IC 3599 Komossa, S.;Bade, N.
  16. ApJL v.41 Tidal Disruptions by Supermassive Black Holes Laguna, P.;Miller, W. A.;Zurek, W. H.;Davies, M. B.
  17. JKAS v.29 Evolution of Debris of a Tidally Disrupted Star by a Masive Black Hole Lee, H. -M.;Kim, S. S.
  18. MNRAS v.217 Continuous Rapid X-ray Variability and Spectral Changes in NGC 4051 Lawrence, A.;Watson, M. G.;Pounds, K. A.;Elvis, M. https://doi.org/10.1093/mnras/217.4.685
  19. ApJ v.547 An RXTE Survey of Long-term X-ray Variabilities in Seyfert 1 Galaxies Markowitz, A.;Edelson, R. https://doi.org/10.1086/318402
  20. ApJ v.529 Parsec-Scale Images of Flat-Spectrum Radio Sources in Seyfert Galaxies Mundell, C. G.;Wilson, A. S.;Ulvestad, J. S.;Roy A. L. https://doi.org/10.1086/308318
  21. ARA&A v.31 X-ray Spectra and Time Variability of Active Galactic Nuclei Mushotzky, R. F.;Done, C.;Pounds, K. A. https://doi.org/10.1146/annurev.aa.31.090193.003441
  22. MNRAS v.268 Ginga Observations of the X-ray Spectra of Seyfert Galaxies Nandra, K.;Pounds, K. A. https://doi.org/10.1093/mnras/268.2.405
  23. ApJ v.476 ASCA Observations of Seyfert 1 Galaxies Nandra, K.;George, I. M.;Mushotzky, R. F.;Turner, T. J.;Yaqoob, T. https://doi.org/10.1086/303600
  24. ApJ v.554 temporal and Spectral Variations of the Superposed Shot as Causes of Power Spectral Densities and Hard X-ray Time Lags of Cygnus X-1 Negoro, H.;Kitamoto, S.;Mineshige, S. https://doi.org/10.1086/321363
  25. ApJ v.263 The Passage of a Star by a Massive Black Hole Nolthenius, R. A.;Katz, J. I. https://doi.org/10.1086/160511
  26. A&A v.205 Mass-Luminosity Relationships and Accretion Rates for Seyfert 1 Galaxies and Quasars Padovani, P.;Rafanelli, P.
  27. ApJ v.501 Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies Peterson, B. M.;Wanders, I.;Horne, K.;Collier, S.;Alexander, T.;Kaspi, S.;Maoz, D. https://doi.org/10.1086/305813
  28. Proc. SPIE v.733 Performance of the Position Sensitive Proportional Counter of the ROSAT Telescope Pfeffermann, E.;Briel, U. G.
  29. ApJ v.253 A Complete X-ray Sample of the High-Latitude /absolute Value fo B greater than 20 /deg Sky from HEAO-1 A-2 Piccinotti, G.;Mushotzky, R. F.;Boldt, E. A.;Holt, S. S.;Marshall, F. E.;Serlemitsos, P. J.;Shafer, R. A. https://doi.org/10.1086/159651
  30. A&AS v.126 Soft Excesses of Hard X-ray Selected Seyfert 1 Galaxies with ROSAT-PSPC Piro, L.;Matt, G.;Ricci, R. https://doi.org/10.1051/aas:1997280
  31. MNRAS v.306 Spectral Evolution of Magnetic Flares and Time Lags in Accreting Black Hole Sources Poutanen, J.;Fabian, A. https://doi.org/10.1046/j.1365-8711.1999.02735.x
  32. ApJ v.501 X-ray Variability as a Probe of Advection-Dominated Accretion in Low Luminosity Active Galactic Nuclei Ptak, A.;Yaqoob, T.;Mushotzky, R. F.;Serlemitsos P.;Griffiths, R. https://doi.org/10.1086/311444
  33. ApJ v.500 Dynamics of magnetic loops in the Coronae of Accretion Disks Romanova, M. M.;Ustyugova, G. V.;Koldoba, A. V.;Chechetkin, V. M.;Lovelace, R. V. E. https://doi.org/10.1086/305760
  34. Nature v.333 Tidal Disruption of Stars by Black Holes of 10 to 6th-10 to the 8th Solar Masses in Nearby Galaxies Rees, M. https://doi.org/10.1038/333523a0
  35. Space Sci. Instr. v.4 The Cosmic X-ray experiment aboard HEAO-1 Rothschild, R.(et al.)
  36. PASJ v.46 The X-ray Astronomy Satellite ASCA Tanaka, Y.;Inoue, H;Holt, S. S.
  37. Space Sci. Rev. v.30 The EXOSAT Mission Taylor, B. G.;Andresen, R. D.;Peacock, A.;Zobl, R. https://doi.org/10.1007/BF01246069
  38. PASJ v.41 The Large Area Counter on GINGA Turner, M. J. L.(et al.)
  39. ApJ v.524 On X-ray Variability in Seyfert Galaxies Turner, T. J.;George, I. M.;Nandra, K.;Turcan, D. https://doi.org/10.1086/307834
  40. ApJ v.381 Einstein Observatory SSS and MPC Observation of the Complex X-ray Spectra of Seyfert Galaxies Turner, T. J.;Weaver, K. A.;Mushotzky, R. F.;Holt, S. S.;Madejsk, G. M. https://doi.org/10.1086/170631
  41. ApJ v.514 Flares from the Tidal Disruption of Stars by Massive Black Holes Ulmer, A. https://doi.org/10.1086/306909
  42. ARA&A v.35 Variability of Active Galactic Nuclei Ulrich, M. -H.;Marachi, L.;Urry, C. M. https://doi.org/10.1146/annurev.astro.35.1.445
  43. A&A v.241 The Eddingdton Ratio of Active Galactic Nuclei in Accretion-Disk and Dynamical Models Wandel, A.
  44. ApJ v.451 An ASCA X-ray Spectrum of a Prototype Bare Seyfert 1 Nucleus in MCG-2-58-22 Weaver, K. A.;Nousek, J.;Yaqoob, T.;Hayashida, K. A.;Murakami, S. https://doi.org/10.1086/176206
  45. AJ v.99 The Nature of the Optical Variations of Seyfert Galaxy 3C 120 Webb, J. R. https://doi.org/10.1086/115311
  46. ApJS v.79 Virial and Jet-Induced Velocities in Seyfert Galaxies Whittle, M. https://doi.org/10.1086/191644
  47. MNRAS v.257 Variability Studies of Seyfert Galaxies. I. Broad-Band Optical Photometry Winkler, H.;Glass, I. S.;van Wyk, F.;Marang, F.;Spencer Jones, J. H.;Buckley, D. A. H.;Sekiguchi, K. https://doi.org/10.1093/mnras/257.4.659

피인용 문헌

  1. The X‐Ray Properties of Active Galactic Nuclei with Double‐peaked Balmer Lines vol.651, pp.2, 2006, https://doi.org/10.1086/507508
  2. The Giant X‐Ray Flare of NGC 5905: Tidal Disruption of a Star, a Brown Dwarf, or a Planet? vol.576, pp.2, 2002, https://doi.org/10.1086/341890
  3. The origin of intergalactic thermonuclear supernovae vol.30, pp.3, 2004, https://doi.org/10.1134/1.1667860
  4. Multi-wavelength Diagnostics of Bombardment by Non-thermal Particles in Solar Flares vol.5, pp.5, 2005, https://doi.org/10.1088/1009-9271/5/5/009
  5. Photospheric Magnetic Field Properties of Flaring versus Flare‐quiet Active Regions. II. Discriminant Analysis vol.595, pp.2, 2003, https://doi.org/10.1086/377512
  6. Non-sequential optimization technique for a computer controlled optical surfacing process using multiple tool influence functions vol.17, pp.24, 2009, https://doi.org/10.1364/OE.17.021850
  7. Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES vol.362, pp.9, 2017, https://doi.org/10.1007/s10509-017-3151-7
  8. The local stability of the magnetized advection-dominated discs with the radial viscous force vol.476, pp.4, 2018, https://doi.org/10.1093/mnras/sty537