SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342

被引：34

作者：

Wajima, Kiyoaki ^{[1
]}

Fujisawa, Kenta ^{[2
,3
]}

Hayashida, Masaaki ^{[4
]}

Isobe, Naoki ^{[5
]}

Ishida, Takafumi ^{[3
]}

Yonekura, Yoshinori ^{[6
]}

机构：

[1] Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[2] Yamaguchi Univ, Res Inst Time Studies, Yamaguchi 7538511, Japan

[3] Yamaguchi Univ, Grad Sch Sci & Engn, Yamaguchi 7538512, Japan

[4] Univ Tokyo, Inst Cosm Ray Res, Kashiwa, Chiba 2778582, Japan

[5] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[6] Ibaraki Univ, Ctr Astron, Mito, Ibaraki 3108512, Japan

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 781卷 / 02期

基金：

中国国家自然科学基金;

关键词：

galaxies: active; galaxies: individual (1H 0323+342); galaxies: Seyfert; radio continuum: galaxies; techniques: interferometric; COMPACT STEEP-SPECTRUM; ALL-SKY SURVEY; STARBURST-AGN CONNECTION; ACTIVE GALACTIC NUCLEI; FREE-FREE ABSORPTION; BLACK-HOLE MASS; VLBI OBSERVATIONS; LOUD; QUASAR; JET;

D O I：

10.1088/0004-637X/781/2/75

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We made simultaneous single-dish and very long baseline interferometer (VLBI) observations of a narrow-line Seyfert 1 galaxy 1H 323+342, showing gamma-ray activity revealed by Fermi/Large Area Telescope observations. We found significant variation of the total flux density at 8 GHz on the timescale of one month by the single-dish monitoring. The total flux density varied by 5.5% in 32 days, which is comparable to the gamma-ray variability timescale, corresponding to the variability brightness temperature of 7.0 x 10(11) K. The source consists of central and southeastern components on the parsec (pc) scale. Only the flux of the central component decreased in the same way as the total flux density, indicating that the short-term radio variability, and probably the gamma-ray-emitting region, is associated with this component. From the VLBI observations, we obtained brightness temperatures of greater than (5.2 +/- 0.3) x 10(10) K and derived an equipartition Doppler factor of greater than 1.7, a variability Doppler factor of 2.2, and an 8 GHz radio power of 10(24.6) W Hz(-1). Combining them, we conclude that acceleration of radio jets and creation of high-energy particles are ongoing in the central engine and that the apparent very radio-loud feature of the source is due to the Doppler boosting effect, resulting in the intrinsic radio loudness being an order of magnitude smaller than the observed values. We also conclude that the pc-scale jet represents recurrent activity from the spectral fitting and the estimated kinematic age of pc- and kpc-scale extended components with different position angles.

引用

页数：12

共 87 条

[1] RADIO-LOUD NARROW-LINE SEYFERT 1 AS A NEW CLASS OF GAMMA-RAY ACTIVE GALACTIC NUCLEI [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, O. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Cutini, S. ;

Dermer, C. D. ;

de Palma, F. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. ;

Favuzzi, C. ;

Fegan, S. J. ;

Focke, W. B. ;

Foschini, L. ;

Frailis, M. ;

Fukazawa, Y. ;

Fusco, P. ;

Gargano, F. ;

Gehrels, N. ;

Germani, S. ;

Giebels, B. .

ASTROPHYSICAL JOURNAL LETTERS, 2009, 707 (02) :L142-L147

[2] FERMI/LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM A RELATIVISTIC JET IN THE NARROW-LINE QUASAR PMN J0948+0022 [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Battelino, M. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cavazzuti, E. ;

Cecchi, C. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Collmar, W. ;

Conrad, J. ;

Costamante, L. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

Digel, S. W. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. ;

Favuzzi, C. ;

Focke, W. B. ;

Foschini, L. ;

Frailis, M. ;

Fuhrmann, L. ;

Fukazawa, Y. ;

Funk, S. .

ASTROPHYSICAL JOURNAL, 2009, 699 (02) :976-984

[3]

Angelakis E., 2012, ARXIV12051961

[4] The colour of the narrow line Sy1-blazar 0324+3410 [J].

Anton, S. ;

Browne, I. W. A. ;

Marcha, M. J. .

ASTRONOMY & ASTROPHYSICS, 2008, 490 (02) :583-587

[5] Flat-spectrum symmetric objects with ∼1 kpc sizes -: I.: The candidates [J].

Augusto, P ;

Gonzalez-Serrano, JI ;

Perez-Fournon, I ;

Wilkinson, PN .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2006, 368 (03) :1411-1428

[6]

BAUM SA, 1990, ASTRON ASTROPHYS, V232, P19

[7] The VLBA Calibrator Survey - VCSI [J].

Beasley, AJ ;

Gordon, D ;

Peck, AB ;

Petrov, L ;

MacMillan, DS ;

Fomalont, EB ;

Ma, C .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2002, 141 (01) :13-21

[8] Black hole mass and Eddington ratio as drivers for the observable properties of radio-loud and radio-quiet QSOs [J].

Boroson, TA .

ASTROPHYSICAL JOURNAL, 2002, 565 (01) :78-85

[9] γ-ray variability of radio-loud narrow-line Seyfert 1 galaxies [J].

Calderone, G. ;

Foschini, L. ;

Ghisellini, G. ;

Colpi, M. ;

Maraschi, L. ;

Tavecchio, F. ;

Decarli, R. ;

Tagliaferri, G. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2011, 413 (04) :2365-2370

[10]

Colla G., 1973, Astronomy and Astrophysics Supplement Series, V11, P291

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