Chasing the heaviest black holes of jetted active galactic nuclei

被引:109
|
作者
Ghisellini, G. [1 ]
Della Ceca, R. [2 ]
Volonteri, M. [3 ]
Ghirlanda, G. [1 ]
Tavecchio, F. [1 ]
Foschini, L. [1 ]
Tagliaferri, G. [1 ]
Haardt, F. [4 ,5 ]
Pareschi, G. [1 ]
Grindlay, J. [6 ]
机构
[1] Osserv Astron Brera, INAF, I-23807 Merate, Italy
[2] Osserv Astron Brera, INAF, I-20100 Milan, Italy
[3] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
[4] Univ Insubria, Dipartimento Matemat & Fis, I-22100 Como, Italy
[5] Ist Nazl Fis Nucl, Sez Milano Bicocca, I-20126 Milan, Italy
[6] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
关键词
radiation mechanisms: non-thermal; BL Lacertae objects: general; quasars: general; gamma-rays: theory; X-rays: general; RADIO-LOUD QUASARS; SLIM ACCRETION DISKS; EXTREME MEV BLAZAR; HIGH-REDSHIFT; OBSERVATIONAL APPEARANCE; FERMI BLAZARS; SKY SURVEY; TELESCOPE; UNIVERSE; GROWTH;
D O I
10.1111/j.1365-2966.2010.16449.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the physical properties of 10 blazars at redshift greater than 2 detected in the 3-yr all-sky survey performed by the Burst Alert Telescope (BAT) on board the Swift satellite. We find that the jets of these blazars are among the most powerful known. Furthermore, the mass of their central black hole, inferred from the optical-ultraviolet bump, exceeds a few billions of solar masses, with accretion luminosities being a large fraction of the Eddington one. We compare their properties with those of the brightest blazars of the 3-month survey performed by the Large Area Telescope (LAT) on board the Fermi satellite. We find that the BAT blazars have more powerful jets, more luminous accretion discs and larger black hole masses than LAT blazars. These findings can be simply understood on the basis of the blazar sequence, which suggests that the most powerful blazars have a spectral energy distribution with a high-energy peak at MeV (or even sub-MeV) energies. This implies that the most extreme blazars can be found more efficiently in hard X-rays, rather than in the high-energy gamma-ray band. We then discuss the implications of our findings for future missions, such as the New Hard X-ray Mission (NHXM) and especially the Energetic X-ray Imaging Survey Telescope (EXIST) mission which, during its planned 2-yr all-sky survey, is expected to detect thousands of blazars, with a few of them at z greater than or similar to 6.
引用
收藏
页码:387 / 400
页数:14
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