Investigating the reasons of variability in Si IV and C IV broad absorption line troughs of quasars

  • Dimitrios Stathopoulos
  • Evangelia Lyratzi
  • Emmanuel Danezis
  • Antonios Antoniou
  • Dimitrios Tzimeas
Regular Article
Part of the following topical collections:
  1. Topical Issue: Physics of Ionized Gases (SPIG 2016)

Abstract

In this paper we analyze the C IV and Si IV broad absorption troughs of two BALQSOs (J101056.69+355833.3, J114548.38+393746.6) to the individual components they consist of. By analyzing a BAL trough to its components we have the advantage to study the variations of the individual absorbing systems in the line of sight and not just the variations of the whole absorption trough or the variations of selected portions of BAL troughs exhibiting changes. We find that the velocity shifts and FWHMs (Full Width at Half Maximum) of the individual components do not vary between an interval of six years. All variable components show changes in the optical depths at line centers which are manifested as variations in the EW (Equivalent Width) of the components. In both BALQSOs, over corresponding velocities, Si IV has higher incidence of variability than C IV. From our analysis, evidence is in favour of different covering fractions between C IV and Si IV. Finally, although most of our results favour the crossing cloud scenario as the cause of variability, there is also strong piece of evidence indicating changing ionization as the source of variability. Thus, a mixed situation where both physical mechanisms contribute to BAL variability is the most possible scenario.

References

  1. 1.
    T.A. Reichard et al., Astron. J. 126, 2594 (2003)ADSCrossRefGoogle Scholar
  2. 2.
    P.C. Hewett, C.B. Foltz, Astron. J. 125, 1784 (2003)ADSCrossRefGoogle Scholar
  3. 3.
    P.B. Hall et al., Mon. Not. R. Astron. Soc. 434, 222 (2013)ADSCrossRefGoogle Scholar
  4. 4.
    R.J. Weymann, S.L. Morris, C.B. Foltz, P.C. Hewett, Astrophys. J. 373, 23 (1991)ADSCrossRefGoogle Scholar
  5. 5.
    C. Foltz, B. Wilkes, R. Weymann, D. Turnshek, PASP 95, 341 (1983)ADSCrossRefGoogle Scholar
  6. 6.
    D.A. Turnshek, in Absorption Lines: Probing the Universe, edited by J.C. Blades (1988)Google Scholar
  7. 7.
    J.D. Scargle, L.J. Caroff, P.D. Noerdlinger, Astrophys. J. 161, 115 (1970)ADSCrossRefGoogle Scholar
  8. 8.
    N. Murray, J. Chiang, S.A. Grossman, G.M. Voit, Astrophys. J. 451, 498 (1995)ADSCrossRefGoogle Scholar
  9. 9.
    C.F. McKee, C.B. Tarter, Astrophys. J. 202, 306 (1975)ADSCrossRefGoogle Scholar
  10. 10.
    D.A. Turnshek, Astrophys. J. 280, 51 (1984)ADSCrossRefGoogle Scholar
  11. 11.
    E. Lyratzi, L. Popović, Č.E. Danezis, M.S. Dimitrijević, A. Antoniou, NewAR 53, 179 (2009)ADSCrossRefGoogle Scholar
  12. 12.
    E. Lyratzi, E. Danezis, L.Č. Popović, M.S. Dimitrijević, A. Antoniou, D. Stathopoulos, MSAIS 15, 161 (2010)ADSGoogle Scholar
  13. 13.
    E. Lyratzi, E. Danezis, L.Č. Popović, A. Antoniou, M.S. Dimitrijević, D. Stathopoulos, BaltA 20, 448 (2011)ADSGoogle Scholar
  14. 14.
    F. Hamann, G. Chartas, S. McGraw, P. Rodriguez Hidalgo, J. Shields, D. Capellupo, J. Charlton, M. Eracleous, Mon. Not. R. Astron. Soc. 435, 133 (2013)ADSCrossRefGoogle Scholar
  15. 15.
    S. Takeuchi, K. Ohsuga, S. Mineshige, PASJ 65, 88 (2013)ADSGoogle Scholar
  16. 16.
    D.M. Capellupo, F. Hamann, T.A. Barlow, Mon. Not. R. Astron. Soc. 444, 1893 (2014)ADSCrossRefGoogle Scholar
  17. 17.
    T. Misawa, N. Inada, M. Oguri, P. Gandhi, T. Horiuchi, S. Koyamada, R. Okamoto, Astrophys. J. 794, 20 (2014)ADSCrossRefGoogle Scholar
  18. 18.
    D. Stathopoulos, E. Danezis, E. Lyratzi, A. Antoniou, D. Tzimeas, JApA, 36, 495 (2015)ADSGoogle Scholar
  19. 19.
    J.H. Matthews, C. Knigge, K.S. Long, S.A. Sim, N. Higginbottom, S.W. Mangham, Mon. Not. R. Astron. Soc. 458, 29 (2016)ADSCrossRefGoogle Scholar
  20. 20.
    T. Waters, D. Proga, Mon. Not. R. Astron. Soc. 460, 79 (2016)ADSCrossRefGoogle Scholar
  21. 21.
    W.G. Mathews, Astrophys. J. 189, 23 (1974)ADSCrossRefGoogle Scholar
  22. 22.
    J. Krolik, C.M. McKee, C.B. Tarter, Astrophys. J. 249, 422 (1981)ADSCrossRefGoogle Scholar
  23. 23.
    M. Bottorff, G. Ferland, Astrophys. J. 549, 118 (2001)ADSCrossRefGoogle Scholar
  24. 24.
    F. Hamann, T.A. Barlow, V. Junkkarinen, Astrophys. J. 478, 87 (1997)ADSCrossRefGoogle Scholar
  25. 25.
    R. Srianand, P. Petitjean, A&A 373, 816 (2001)ADSCrossRefGoogle Scholar
  26. 26.
    T. Misawa, M. Eracleous, J.C. Charlton, A. Tajitsu, Astrophys. J. 629, 115 (2005)ADSCrossRefGoogle Scholar
  27. 27.
    B.F. Lundgren, B.C. Wilhite, R.J. Brunner, P.B. Hall, D.P. Schneider, D.G. York, D.E. Vanden Berk, J. Brinkmann, Astrophys. J. 656, 73 (2007)ADSCrossRefGoogle Scholar
  28. 28.
    P.B. Hall, K. Anosov, R.L. White, W.N. Brandt, M.D. Gregg, R.R. Gibson, R.H. Becker, D.P. Schneider, Mon. Not. R. Astron. Soc. 411, 2653 (2011)ADSCrossRefGoogle Scholar
  29. 29.
    D.M. Capellupo, F. Hamann, J.C. Shields, J. Halpern, P.R. Hidalgo, T.A. Barlow, in Astronomical Society of the Pacific Conference Series, AGN Winds in Charleston, edited by G. Chartas, F. Hamann, K.M. Leighly (2012), Vol. 460, p. 88Google Scholar
  30. 30.
    D.M. Capellupo, F. Hamann, J.C. Shields, P. Rodriguez Hidalgo, T.A. Barlow, Mon. Not. R. Astron. Soc. 422, 3249 (2012)ADSCrossRefGoogle Scholar
  31. 31.
    D.M. Capellupo, F. Hamann, J.C. Shields et al., Mon. Not. R. Astron. Soc. 429, 1872 (2013)ADSCrossRefGoogle Scholar
  32. 32.
    N. Filiz Ak, W.N. Brandt, P.B. Hall, D.P. Schneider, S.F. Anderson, F. Hamann, B.F. Lundgren, A.D. Myers, I. Paris, P. Petitjean, N.P. Ross, Y. Shen, D. York, Astrophys. J. 777, 168 (2013)ADSCrossRefGoogle Scholar
  33. 33.
    M. Vivek, R. Srianand, P. Petitjean, V. Mohan, A. Mahabal, S. Samui, Mon. Not. R. Astron. Soc. 440, 799 (2014)ADSCrossRefGoogle Scholar
  34. 34.
    F. Hamann, K.F. Kaplan, P. Rodriguez Hidalgo et al., Mon. Not. R. Astron. Soc. (Lett.) 391, 39 (2008)ADSCrossRefGoogle Scholar
  35. 35.
    P. Rodriguez Hidalgo, F. Hamann, P. Hall, Mon. Not. R. Astron. Soc. 411, 247 (2011)ADSCrossRefGoogle Scholar
  36. 36.
    M. Vivek, R. Srianand, A. Mahabal, V.C. Kuriakose, Mon. Not. R. Astron. Soc. (Lett.) 421, 107 (2012)ADSCrossRefGoogle Scholar
  37. 37.
    M. Vivek, R. Srianand, P. Petitjean, P. Noterdaeme, V. Mohan, A. Mahabal, V.C. Kuriakose, Mon. Not. R. Astron. Soc. 423, 2879 (2012)ADSCrossRefGoogle Scholar
  38. 38.
    C. Wildy, M.R. Goad, J.T. Allen, Mon. Not. R. Astron. Soc. 448, 2397 (2015)ADSCrossRefGoogle Scholar
  39. 39.
    J.R. Gabel et al., Astrophys. J. 595, 120 (2003)ADSCrossRefGoogle Scholar
  40. 40.
    P.B. Hall, S.I. Sadavoy, D. Hutsemekers, J.E. Everett, A. Rafiee, Astrophys. J. 665, 174 (2007)ADSCrossRefGoogle Scholar
  41. 41.
    D.M. Capellupo, F. Hamann, J.C. Shields, P. Rodriguez Hidalgo, T.A. Barlow, Mon. Not. R. Astron. Soc. 413, 908 (2011)ADSCrossRefGoogle Scholar
  42. 42.
    T.A. Barlow, Ph.D. thesis, A&A (California Univ., 1993)Google Scholar
  43. 43.
    J.H. Wise, M. Eracleous, J.C. Charlton, R. Ganguly, Astrophys. J. 613, 129 (2004)ADSCrossRefGoogle Scholar
  44. 44.
    R.R. Gibson, W.N. Brandt, D.P. Schneider, S.C. Gallagher, Astrophys. J. 675, 985 (2008)ADSCrossRefGoogle Scholar
  45. 45.
    F. Hamann, Mon. Not. R. Astron. Soc. 391, 39 (2008)ADSCrossRefGoogle Scholar
  46. 46.
    R.R. Gibson, W.N. Brandt, S.C. Gallagher, P.C. Hewett, D.P. Schneider, Astrophys. J. 713, 220 (2010)ADSCrossRefGoogle Scholar
  47. 47.
    T.A. Barlow, V.T. Junkkarinen, E.M. Burbidge, R.J. Weymann, S.L. Morris, K.T. Korista, Astrophys. J. 397, 81 (1992)ADSCrossRefGoogle Scholar
  48. 48.
    T. Misawa, M. Eracleous, J.C. Charlton, N. Kashikawa, Astrophys. J. 660, 152 (2007)ADSCrossRefGoogle Scholar
  49. 49.
    C.A. Welling, B.P. Miller, W.N. Brandt, D.M. Capellupo, R.R. Gibson, Mon. Not. R. Astron. Soc. 440, 2474 (2014)ADSCrossRefGoogle Scholar
  50. 50.
    C. Wildy, M.R. Goad, J.T. Allen, Mon. Not. R. Astron. Soc. 437, 1976 (2014)ADSCrossRefGoogle Scholar
  51. 51.
    Z.-C. He, W.-H. Bian, X. Ge, X.-L. Jiang, Mon. Not. R. Astron. Soc. 454, 3962 (2015)ADSCrossRefGoogle Scholar
  52. 52.
    E. Danezis, D. Nikolaidis, V. Lyratzi, M. Stathopoulou, E. Theodossiou, A. Kosionidis, C. Drakopoulos, G. Christou, P. Koutsouris, Astrophys. Space Sci. 284, 1119 (2003)ADSCrossRefGoogle Scholar
  53. 53.
    E. Danezis, D. Nikolaidis, E. Lyratzi, L.Č. Popović, M.S. Dimitrijević, A. Antoniou, E. Theodosiou, PASJ 59, 827 (2007)ADSGoogle Scholar
  54. 54.
    E. Danezis, E. Lyratzi, L.Č. Popović, M.S. Dimitrijević, A. Antoniou, NewAR 53, 214 (2009)ADSCrossRefGoogle Scholar
  55. 55.
    E. Lyratzi, E. Danezis, L.Č. Popović, M.S. Dimitrijević, D. Nikolaidis, A. Antoniou, PASJ 59, 357 (2007)ADSGoogle Scholar
  56. 56.
    N. Markova, A&AS 144, 391 (2000)ADSCrossRefGoogle Scholar
  57. 57.
    B. Bates, S. Gilheany, Mon. Not. R. Astron. Soc. 243, 320 (1990)ADSGoogle Scholar
  58. 58.
    S. Gilheany et al., Astrophys. Space Sci. 169, 85 (1990)ADSCrossRefGoogle Scholar
  59. 59.
    W.L. Waldron, L. Klein, B. Altner, ASP Conf. Series 22, 181 (1992)ADSGoogle Scholar
  60. 60.
    T. Rivinius et al., A&A 318, 819 (1997)ADSGoogle Scholar
  61. 61.
    E. Danezis, The nature of Be stars, Ph.D. thesis (University of Athens, 1983)Google Scholar
  62. 62.
    E.L. Fitzpatrick, D.L. Massa, Astrophys. J. 525, 1011 (1999)ADSCrossRefGoogle Scholar
  63. 63.
    D.J. Schlegel, D.P. Finkbeiner, M. Davis, Astrophys. J. 500, 525 (1998)ADSCrossRefGoogle Scholar
  64. 64.
    A. Rafiee, P.B. Hall, Astrophys. J. Suppl. 194, 42 (2011)ADSCrossRefGoogle Scholar
  65. 65.
    T.A. Barlow, W.L.W. Sargent, Astron. J. 113, 136 (1997)ADSCrossRefGoogle Scholar
  66. 66.
    F. Hamann, T.A. Barlow, V. Junkkarinen, E.M. Burbidge, Astrophys. J. 478, 80 (1997)ADSCrossRefGoogle Scholar
  67. 67.
    F.W. Hamann, T.A. Barlow, F.C. Chaffee, C.B. Foltz, R.J. Weymann, Astrophys. J. 550, 142 (2001)ADSCrossRefGoogle Scholar
  68. 68.
    R. Ganguly, M. Eracleous, J.C. Charlton, C.W. Churchill, Astron. J. 117, 2594 (1999)ADSCrossRefGoogle Scholar
  69. 69.
    J.R. Gabel, N. Arav, J.S. Kaastra, G.A. Kriss, E. Behar, E. Costantini, C.M. Gaskell, K.T. Korista, A. Laor, F. Paerels, D. Proga, J.K. Quijano, M. Sako, J.E. Scott, K.C. Steenbrugge, Astrophys. J. 623, 85 (2005)ADSCrossRefGoogle Scholar
  70. 70.
    J.R. Gabel, N. Arav, T.-S. Kim, Astrophys. J. 646, 742 (2006)ADSCrossRefGoogle Scholar
  71. 71.
    N. Arav, M. Moe, E. Costantini, K.T. Korista, C. Benn, S. Ellison, Astrophys. J. 681, 954 (2008)ADSCrossRefGoogle Scholar

Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Dimitrios Stathopoulos
    • 1
    • 2
  • Evangelia Lyratzi
    • 1
    • 2
  • Emmanuel Danezis
    • 1
  • Antonios Antoniou
    • 1
  • Dimitrios Tzimeas
    • 1
  1. 1.National and Kapodistrian University of Athens, Faculty of PhysicsAthensGreece
  2. 2.Eugenides FoundationAthensGreece

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