SIGNIFICANT LIMB-BRIGHTENING IN THE INNER PARSEC OF MARKARIAN 501

被引：29

作者：

Piner, B. Glenn ^{[1
]}

Pant, Niraj ^{[1
]}

Edwards, Philip G. ^{[2
]}

Wiik, Kaj ^{[3
]}

机构：

[1] Whittier Coll, Dept Phys & Astron, Whittier, CA 90608 USA

[2] CSIRO Australia Telescope Natl Facil, Narrabri, NSW 2390, Australia

[3] Univ Turku, Tuorla Observ, FI-21500 Piikkio, Finland

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 690卷 / 01期

基金：

美国国家科学基金会;

关键词：

BL Lacertae objects: individual (Markarian 501); galaxies: active; galaxies: jets; radio continuum: galaxies; GAMMA-RAYS; BLAZARS; JET; OBJECTS; BASE; M87;

D O I：

10.1088/0004-637X/690/1/L31

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present three 43 GHz images and a single 86 GHz image of Markarian 501 from VLBA observations in 2005. The 86 GHz image shows a partially resolved core with a flux density of about 200 mJy and a size of about 300 Schwarzschild radii, similar to recent results by Giroletti et al. Extreme limb-brightening is found in the inner parsec of the jet in the 43 GHz images, providing strong observational support for a "spine-layer" structure at this distance from the core. The jet is well-resolved transverse to its axis, allowing Gaussian model components to be fit to each limb of the jet. The spine-layer brightness ratio and relative sizes, the jet opening angle, and a tentative detection of superluminal motion in the layer are all discussed.

引用

页码：L31 / L34

页数：4

共 16 条

[1] Variable very high energy γ-ray emission from Markarian 501 [J].

Albert, J. ;

Aliu, E. ;

Anderhub, H. ;

Antoranz, P. ;

Armada, A. ;

Baixeras, C. ;

Barrio, J. A. ;

Bartko, H. ;

Bastieri, D. ;

Becker, J. K. ;

Bednarek, W. ;

Berger, K. ;

Bigongiari, C. ;

Biland, A. ;

Bock, R. K. ;

Bordas, P. ;

Bosch-Ramon, V. ;

Bretz, T. ;

Britvitch, I. ;

Camara, M. ;

Carmona, E. ;

Chilingarian, A. ;

Coarasa, J. A. ;

Commichau, S. ;

Contreras, J. L. ;

Cortina, J. ;

Costado, M. T. ;

Curtef, V. ;

Danielyan, V. ;

Dazzi, F. ;

De Angelis, A. ;

Delgado, C. ;

de los Reyes, R. ;

De Lotto, B. ;

Domingo-Santamaria, E. ;

Dorner, D. ;

Doro, M. ;

Errando, M. ;

Fagiolini, M. ;

Ferenc, D. ;

Fernandez, E. ;

Firpo, R. ;

Flix, J. ;

Fonseca, M. V. ;

Font, L. ;

Fuchs, M. ;

Galante, N. ;

Garcia-Lopez, R. J. ;

Garczarczyk, M. ;

Gaug, M. .

ASTROPHYSICAL JOURNAL, 2007, 669 (02) :862-883

[2] Implications of very rapid TeV variability in blazars [J].

Begelman, Mitchell C. ;

Fabian, Andrew C. ;

Rees, Martin J. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2008, 384 (01) :L19-L23

[3] Simultaneous radio-interferometric and high-energy TeV observations of the γ-ray blazar Mkn 421 [J].

Charlot, P. ;

Gabuzda, D. C. ;

Sol, H. ;

Degrange, B. ;

Piron, F. .

ASTRONOMY & ASTROPHYSICS, 2006, 457 (02) :455-465

[4] The subluminal parsec-scale jet of Markarian 501 [J].

Edwards, PG ;

Piner, BG .

ASTROPHYSICAL JOURNAL, 2002, 579 (02) :L67-L70

[5] Structured jets in TeVBL Lac objects and radiogalaxies - Implications for the observed properties [J].

Ghisellini, G ;

Tavecchio, F ;

Chiaberge, M .

ASTRONOMY & ASTROPHYSICS, 2005, 432 (02) :401-410

[6] The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds [J].

Giroletti, M. ;

Giovannini, G. ;

Cotton, W. D. ;

Taylor, G. B. ;

Perez-Torres, M. A. ;

Chiaberge, M. ;

Edwards, P. G. .

ASTRONOMY & ASTROPHYSICS, 2008, 488 (03) :905-914

[7] Parsec-scale properties of Markarian 501 [J].

Giroletti, M ;

Giovannini, G ;

Feretti, L ;

Cotton, WD ;

Edwards, PG ;

Lara, L ;

Marscher, AP ;

Mattox, JR ;

Piner, BG ;

Venturi, T .

ASTROPHYSICAL JOURNAL, 2004, 600 (01) :127-140

[8] Multiepoch Very Long Baseline Array observations of egret-detected quasars and BL lacertae objects: Superluminal motion of gamma-ray bright blazars [J].

Jorstad, SG ;

Marscher, AP ;

Mattox, JR ;

Wehrle, AE ;

Bloom, SD ;

Yurchenko, AV .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2001, 134 (02) :181-240

[9] The inner jet of the radio galaxy M87 [J].

Kovalev, Y. Y. ;

Lister, M. L. ;

Homan, D. C. ;

Kellermann, K. I. .

ASTROPHYSICAL JOURNAL, 2007, 668 (01) :L27-L30

[10]

LOVELL JEJ, 2000, ASTROPHYSICAL PHENOM, P301

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