Gamma-loud quasars:: A view with BeppoSAX

被引:76
作者
Tavecchio, F
Maraschi, L
Ghisellini, G
Celotti, A
Chiappetti, L
Comastri, A
Fossati, G
Grandi, P
Pian, E
Tagliaferri, G
Treves, A
Raiteri, CM
Sambruna, R
Villata, M
机构
[1] Osservatorio Astron Brera, I-20121 Milan, Italy
[2] Osservatorio Astron Brera, I-23807 Merate, Italy
[3] SISSA, Int Sch Adv Studies, I-34014 Trieste, Italy
[4] CNR, Ist Fis Cosm, I-20133 Milan, Italy
[5] Osservatorio Astron Bologna, I-40127 Bologna, Italy
[6] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA
[7] CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy
[8] CNR, Ist Tecnol & Radiaz Extraterr, I-40129 Bologna, Italy
[9] Univ Insubria, I-22100 Como, Italy
[10] Osservatorio Astron Torino, I-10025 Pino Torinese, Italy
[11] Penn State Univ, Davey Lab 525, University Pk, PA 16802 USA
关键词
galaxies : individual (0836+710,1510-089,2230+114); quasars : general; radiation mechanisms : nonthermal; X-rays : general;
D O I
10.1086/317136
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present BeppoSAX observations of three gamma -ray-emitting quasars, namely, 0836+710, 1510-089, and 2230+114. The three objects have been detected up to similar to 100 keV showing extremely hat power-law spectra above 2 keV (energy index alpha (2-10) = 0.3-0.5). The soft X-ray spectrum of 0836+710 implies either an absorption column density higher than the Galactic one or an intrinsically very hard slope (alpha (0.1-1) = -0.2) below 1 keV. 1510-089 shows a soft excess, with the low-energy spectrum steeper (alpha (0.1-1) = 1.6) than the high-energy power law. The results are discussed in the framework of current inverse Compton models for the high-energy emission of hat-spectrum radio quasars and are used to estimate the physical quantities in the jet-emitting region and to shed light on the energy transport mechanisms in jets. Finally we discuss the estimates of the jet luminosity in the context of the Blandford & Znajek mechanism for jet production.
引用
收藏
页码:535 / 544
页数:10
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