Abstract
Based upon Fermi 2FGL and 3FGL catalogues, a sample of 842 blazars (hereinto 356 FSRQs, 486 BL Lac objects) is collected to discuss the changes of \(\gamma\)-ray photon spectral indices and brightness from 2FGL to 3FGL blazars. Our results indicate that the distributions of \(\gamma\)-ray photon spectral indices and luminosities between 2FGL and 3FGL have no obvious difference; The photon spectral indices and \(\gamma\)-ray luminosity from 2FGL are closely correlated with that from 3FGL respectively; There are close anti-relations between the change of photon spectral indices and the change of luminosity for FSRQs and BL Lac objects samples and for sub-class samples of HBLs, IBLs and LBLs, which suggests that the spectrum becomes flat when the source becomes bright.
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Abdo, A.A., Ackermann, M., Ajello, M., et al.: Astrophys. J. 700, 597 (2009a)
Abdo, A.A., Ackermann, M., Ajello, M., et al.: Astrophys. J. Suppl. Ser. 183, 46 (2009b)
Abdo, A.A., Ackermann, M., Agudo, I., et al.: Astrophys. J. 716, 30 (2010a)
Abdo, A.A., Ackermann, M., Ajello, M., et al.: Astrophys. J. Suppl. Ser. 188, 405 (2010b)
Abdo, A.A., Ackermann, M., Ajello, M., et al.: Astrophys. J. 722, 520 (2010c)
Acero, F., Ackermann, M., Ajello, M., et al.: Astrophys. J. Suppl. Ser. 218, 23 (2015)
Ackermann, M., Ajello, M., Allafort, A., et al.: Astrophys. J. 743, 171 (2011)
Ackermann, M., Ajello, M., Atwood, W., et al.: Astrophys. J. 810, 14 (2015)
Aller, M.F., Aller, H.D., Hughes, P.A.: J. Astrophys. Astron. 32, 5 (2011)
Bastieri, D., Ciprini, S., Gasparrini, D.: J. Astrophys. Astron. 32, 169 (2011)
Blandford, R.D., Levinson, A.: Astrophys. J. 441, 79 (1995)
Bloom, S.D., Marscher, A.P.: Astrophys. J. 461, 657 (1996)
Böttcher, M., Dermer, C.D.: Astrophys. J. 564, 86 (2002)
Coppi, P.S., Kartje, J.F., Königl, A.: AIPC News 280, 559 (1993)
Dermer, C.D., Schlickeiser, R., Mastichiadis, A.: Astron. Astrophys. 256, 27 (1992)
Fan, J.H., Lin, R.G.: Astrophys. J. Suppl. Ser. 121, 131–157 (1999)
Fan, J.H., Xie, G.Z.: Astron. Astrophys. 306, 55 (1996)
Fan, J.H., Xie, G.Z., Pecontal, E., et al.: Astrophys. J. 507, 173 (1998)
Fan, J.H., Cheng, K.S., Zhang, L.: Publ. Astron. Soc. Jpn. 54, 533 (2002)
Fan, J.H., Liu, Y., Li, Y., et al.: J. Astrophys. Astron. 32, 67 (2011)
Fan, J.H., Yang, J.H., Yuan, Y.H., et al.: Astrophys. J. 761, 125 (2012)
Fan, J.H., Yang, J.H., Zhang, J.Y., et al.: Publ. Astron. Soc. Jpn. 65, 25 (2013)
Fan, J.H., Yang, J.H., Liu, Y., et al.: Int. J. Mod. Phys. A 30, 1545020 (2015)
Fan, J.H., Yang, J.H., Liu, Y., et al.: Astrophys. J. Suppl. Ser. 226, 20 (2016)
Gear, W.K., Robson, E.I., Brown, L.M.J.: Nature 324, 546 (1986)
Ghisellini, G., Madau, P.: Mon. Not. R. Astron. Soc. 280, 67 (1996)
Ghisellini, G., Villata, M., Raiteri, C.M., et al.: Astron. Astrophys. 327, 61 (1997)
Ghisellini, G., Tavecchio, F., Foschini, L., et al.: Mon. Not. R. Astron. Soc. 402, 497 (2010)
Hartman, R.C., Bertsch, D.L., Bloom, S.D., et al.: Astrophys. J. Suppl. Ser. 123, 79 (1999)
Lin, C., Fan, J.H.: Res. Astron. Astrophys. 16, 103 (2016)
Maraschi, L., Ghisellini, G., Celotti, A.: Astrophys. J. 397, 5 (1992)
Marscher, A., Jorstad, S.G., Larionov, V.M., et al.: J. Astrophys. Astron. 32, 233 (2011)
Nie, J.J., Fan, J.H., Yang, R.S., et al.: Sci. China, Phys. Mech. Astron. 57, 2007 (2014)
Nolan, P.L., Abdo, A.A., Ackermann, M., et al.: Astrophys. J. Suppl. Ser. 199, 31 (2012)
Pedro, R.C., Priyamvada, N.: New J. Phys. 9, 445 (2007)
Poon, H., Fan, J.H., Fu, J.N.: Astrophys. J. Suppl. Ser. 185, 511 (2009)
Raiteri, C.M., Villata, M., Tosti, G., et al.: Astron. Astrophys. 402, 151 (2003)
Romero, G.E., Cellone, S.A., Combi, J.A.: Astron. Astrophys. 360, 47 (2000)
Sikora, M., Begelman, M.C., Rees, M.J.: Astrophys. J. 421, 153 (1994)
Urry, M.: J. Astrophys. Astron. 32, 139 (2011)
Urry, C.M., Padovani, P.: Publ. Astron. Soc. Pac. 107, 803 (1995)
Vercellone, S., D’Ammando, F., Vittorini, V., et al.: Astrophys. J. 712, 405 (2010)
Villata, M., Raiteri, C.M., Kurtanidze, O.M., et al.: Astron. Astrophys. 421, 103 (2004)
Wu, J.H., Peng, B., Zhou, X., et al.: Astron. J. 129, 1818 (2005)
Yang, J.H., Fan, J.H.: Chin. J. Astron. Astrophys. 5, 229 (2005)
Yang, J.H., Wang, Y.X., Yang, R.S.: Chin. J. Astron. Astrophys. 6b, 341 (2006)
Yang, J.H., Fan, J.H., Yang, R.S.: Sci. China, Phys. Mech. Astron. 53, 1162 (2010)
Yang, J.H., Fan, J.H., Nie, J.J., et al.: Sci. China, Phys. Mech. Astron. 55, 2179 (2012a)
Yang, J.H., Fan, J.H., Yuan, Y.H.: Sci. China, Phys. Mech. Astron. 55, 1510 (2012b)
Yang, J.H., Fan, J.H., Hua, T.X., et al.: Astrophys. Space Sci. 352, 819 (2014a)
Yang, J.H., Nie, J.J., Yang, R.S.: J. Hunan Univ. Arts Sci. 26, 56 (2014b)
Zdziarski, A.A., Krolik, J.H.: Astrophys. J. 409, 33 (1993)
Acknowledgements
This work is supported by the National Natural Science Foundation of China (U1431112, U1531245, 10633010, 11173009, 11203007, 11403006), and the Innovation Foundation of Guangzhou University (IFGZ), Guangdong Innovation Group for Astrophysics (2014KCXTD014), Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (GDUPS) (2009), Yangcheng Scholar Funded Scheme (10A027S), and support for Astrophysics Key Subjects of Guangdong Province and Guangzhou City, and Hunan Provincial Natural Science Foundation of China (2015JJ2104), the research fund of Hunan University of Arts and Science (JJZD201101).
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Yang, J., Fan, J., Nie, J. et al. The \(\gamma\)-ray spectral changes in Fermi blazars. Astrophys Space Sci 362, 22 (2017). https://doi.org/10.1007/s10509-016-3002-y
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DOI: https://doi.org/10.1007/s10509-016-3002-y