γ-RAY SPECTRAL EVOLUTION OF NGC 1275 OBSERVED WITH FERMI LARGE AREA TELESCOPE

被引:50
作者
Kataoka, J. [1 ]
Stawarz, L. [2 ,3 ]
Cheung, C. C. [4 ]
Tosti, G. [5 ,6 ]
Cavazzuti, E. [7 ]
Celotti, A. [8 ]
Nishino, S. [9 ]
Fukazawa, Y. [9 ]
Thompson, D. J. [10 ]
McConville, W. F. [10 ,11 ]
机构
[1] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan
[2] JAXA, Inst Space & Astronaut Sci, Kanagawa 2525210, Japan
[3] Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland
[4] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA
[5] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
[6] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy
[7] ASI Sci Data Ctr, I-00044 Rome, Italy
[8] SISSA, I-34014 Trieste, Italy
[9] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan
[10] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[11] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
基金
美国国家航空航天局; 瑞典研究理事会;
关键词
galaxies: active; galaxies: individual (NGC 1275); galaxies: jets; gamma rays: general; radiation mechanisms: non-thermal; ACTIVE GALACTIC NUCLEI; PEAKED BL-LACERTAE; PARTICLE-ACCELERATION; PERSEUS CLUSTER; EMISSION; DISCOVERY; BLAZAR; FLARE; JETS; RADIATION;
D O I
10.1088/0004-637X/715/1/554
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report on a detailed investigation of the high-energy gamma-ray emission from NGC 1275, a well-known radio galaxy hosted by a giant elliptical located at the center of the nearby Perseus cluster. With the increased photon statistics, the center of the gamma-ray-emitting region is now measured to be separated by only 0.46 arcmin from the nucleus of NGC 1275, well within the 95% confidence error circle with radius similar or equal to 1.5 arcmin. Early Fermi Large Area Telescope (LAT) observations revealed a significant decade-timescale brightening of NGC 1275 at GeV photon energies, with a flux about 7 times higher than the one implied by the upper limit from previous EGRET observations. With the accumulation of one year of Fermi-LAT all-sky-survey exposure, we now detect flux and spectral variations of this source on month timescales, as reported in this paper. The average > 100 MeV gamma-ray spectrum of NGC 1275 shows a possible deviation from a simple power-law shape, indicating a spectral cutoff around an observed photon energy of epsilon(gamma) = 42.2 +/- 19.6 GeV, with an average flux of F-gamma = (2.31 +/- 0.13) x 10(-7) photons cm(-2) s(-1) and a power-law photon index, Gamma(gamma) = 2.13 +/- 0.02. The largest gamma-ray flaring event was observed in 2009 April-May and was accompanied by significant spectral variability above epsilon(gamma) greater than or similar to 1-2 GeV. The gamma-ray activity of NGC 1275 during this flare can be described by a hysteresis behavior in the flux versus photon index plane. The highest energy photon associated with the gamma-ray source was detected at the very end of the observation, with the observed energy of epsilon(gamma) = 67.4 GeV and an angular separation of about 2.4 arcmin from the nucleus. In this paper we present the details of the Fermi-LAT data analysis, and briefly discuss the implications of the observed gamma-ray spectral evolution of NGC 1275 in the context of gamma-ray blazar sources in general.
引用
收藏
页码:554 / 560
页数:7
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