The changing look of PKS 2149-306

被引：14

作者：

Bianchin, V. ^{[1
]}

Foschini, L. ^{[1
]}

Ghisellini, G. ^{[2
]}

Tagliaferri, G. ^{[2
]}

Tavecchio, F. ^{[2
]}

Treves, A. ^{[3
]}

Di Cocco, G. ^{[1
]}

Gliozzi, M. ^{[4
]}

Pian, E. ^{[5
]}

Sambruna, R. M. ^{[6
]}

Wolter, A. ^{[2
]}

机构：

[1] INAF IASF Bologna, I-40129 Bologna, Italy

[2] Osserv Astron Brera, INAF, I-23807 Merate, Italy

[3] Univ Insubria, Dipartimento Sci, Como, Italy

[4] George Mason Univ, Fairfax, VA 22030 USA

[5] Osserv Astron Trieste, INAF, I-34131 Trieste, Italy

[6] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 496卷 / 02期

关键词：

quasars: individual: PKS 2149-306; quasars: general; X-rays: galaxies; RADIO-LOUD QUASARS; ACTIVE GALACTIC NUCLEI; HIGH-REDSHIFT QUASARS; XMM-NEWTON OBSERVATIONS; PHOTON IMAGING CAMERA; X-RAY-SPECTRA; EMISSION-LINE; TELESCOPE; BLAZARS; CATALOG;

D O I：

10.1051/0004-6361/200811128

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We study the blazar nature of the high-redshift Flat-Spectrum Radio Quasar PKS 2149-306 (z = 2.345) by investigating its long-term behavior. Methods. We analyzed all publicly available optical-to-X-ray observations performed by XMM-Newton, Swift, and INTEGRAL. Results. PKS 2149-306 is one of four blazars at z > 2 that have been observed in the hard-X-ray regime with both the BAT and ISGRI instruments. Observations acquired almost 1 year apart in the 60-300 keV energy band in the object rest frame, exhibit no noticeable change in spectral slope associated with a flux variation of more than a factor of two. Swift data appear to show a roll-off below similar to 1 keV, which becomes increasingly evident during a similar to 3-day time-frame, that can be explained as the natural spectral break caused by the Inverse Compton onset. The broad-band spectra allow us to identify two different states. The SED modeling suggests that they can be interpreted by only a change in the bulk Lorentz factor of the jet.

引用

页码：423 / 428

页数：6

共 40 条

[1] The burst alert telescope (BAT) on the Swift MIDEX mission [J].

Barthelmy, SD ;

Barbier, LM ;

Cummings, JR ;

Fenimore, EE ;

Gehrels, N ;

Hullinger, D ;

Krimm, HA ;

Markwardt, CB ;

Palmer, DM ;

Parsons, A ;

Sato, G ;

Suzuki, M ;

Takahashi, T ;

Tashiro, M ;

Tueller, J .

SPACE SCIENCE REVIEWS, 2005, 120 (3-4) :143-164

[2]

BAUMGARTNER W, 2008, ASTRON TELEGRAM, P1429

[3] The third IBIS/ISGRI soft gamma-ray survey catalog [J].

Bird, A. J. ;

Malizia, A. ;

Bazzano, A. ;

Barlow, E. J. ;

Bassani, L. ;

Hill, A. B. ;

Belanger, G. ;

Capitanio, F. ;

Clark, D. J. ;

Dean, A. J. ;

Fiocchi, M. ;

Goetz, D. ;

Lebrun, F. ;

Molina, M. ;

Produit, N. ;

Renaud, M. ;

Sguera, V. ;

Stephen, J. B. ;

Terrier, R. ;

Ubertini, P. ;

Walter, R. ;

Winkler, C. ;

Zurita, J. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2007, 170 (01) :175-186

[4] The Swift X-ray telescope [J].

Burrows, DN ;

Hill, JE ;

Nousek, JA ;

Kennea, JA ;

Wells, A ;

Osborne, JP ;

Abbey, AF ;

Beardmore, A ;

Mukerjee, K ;

Short, ADT ;

Chincarini, G ;

Campana, S ;

Citterio, O ;

Moretti, A ;

Pagani, C ;

Tagliaferri, G ;

Giommi, P ;

Capalbi, M ;

Tamburelli, F ;

Angelini, L ;

Cusumano, G ;

Bräuninger, HW ;

Burkert, W ;

Hartner, GD .

SPACE SCIENCE REVIEWS, 2005, 120 (3-4) :165-195

[5] ASCA and ROSAT X-ray spectra of high-redshift radio-loud quasars [J].

Cappi, M ;

Matsuoka, M ;

Comastri, A ;

Brinkmann, W ;

Elvis, M ;

Palumbo, GGC ;

Vignali, C .

ASTROPHYSICAL JOURNAL, 1997, 478 (02) :492-510

[6] THE RELATIONSHIP BETWEEN INFRARED, OPTICAL, AND ULTRAVIOLET EXTINCTION [J].

CARDELLI, JA ;

CLAYTON, GC ;

MATHIS, JS .

ASTROPHYSICAL JOURNAL, 1989, 345 (01) :245-256

[7] Bulk comptonization spectra in blazars [J].

Celotti, A. ;

Ghisellini, G. ;

Fabian, A. C. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 375 (02) :417-424

[8] The INTEGRAL science data centre (ISDC) [J].

Courvoisier, TJL ;

Walter, R ;

Beckmann, V ;

Dean, AJ ;

Dubath, P ;

Hudec, R ;

Kretschmar, P ;

Mereghetti, S ;

Montmerle, T ;

Mowlavi, N ;

Paltani, S ;

Martinez, AP ;

Produit, N ;

Staubert, R ;

Strong, AW ;

Swings, JP ;

Westergaard, NJ ;

White, N ;

Winkler, C ;

Zdziarski, AA .

ASTRONOMY & ASTROPHYSICS, 2003, 411 (01) :L53-L57

[9] 150 keV emission from PKS 2149-306 with BeppoSAX [J].

Elvis, M ;

Fiore, F ;

Siemiginowska, A ;

Bechtold, J ;

Mathur, S ;

McDowell, J .

ASTROPHYSICAL JOURNAL, 2000, 543 (02) :545-551

[10] Chandra observations of two high-redshift quasars [J].

Fang, TT ;

Marshall, HL ;

Bryan, GL ;

Canizares, CR .

ASTROPHYSICAL JOURNAL, 2001, 555 (01) :356-363

← 1 2 3 4 →