Linear and circular polarization from Sagittarius A and M81

被引：7

作者：

Bower, GC ^{[1
]}

机构：

[1] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA

来源：

ASTROPHYSICS AND SPACE SCIENCE | 2003年 / 288卷 / 1-2期

关键词：

D O I：

10.1023/B:ASTR.0000004995.36315.39

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe recent results for Sgr A*, M81* and other low luminosity active galactic nuclei. We have conducted linear and circular polarimetry over a frequency range of 1.4 to 230 GHz and detected a variety of phenomena. The polarization properties of the studied sources are substantially different from higher powered AGN. In the case of Sgr A*, we are able to eliminate ADAFs and Bondi-Hoyle flows as possible models based on mm. polarimetry. Our success with Sgr A* demonstrates that we can learn about the nature of accretion and outflow in these sources with unprecedented detail. We may also develop probes of general relativity in the strong-field limit.

引用

页码：69 / 76

页数：8

共 9 条

[1]

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[2] The linear polarization of Sagittarius A*. II. VLA and BIMA polarimetry at 22, 43, and 86 GHz [J].

Bower, GC ;

Wright, MCH ;

Backer, DC ;

Falcke, H .

ASTROPHYSICAL JOURNAL, 1999, 527 (02) :851-855

[3] Detection of circular polarization in the Galactic center black hole candidate Sagittarius A* [J].

Bower, GC ;

Falcke, H ;

Backer, DC .

ASTROPHYSICAL JOURNAL, 1999, 523 (01) :L29-L32

[4] The spectrum and variability of circular polarization in Sagittarius A* from 1.4 to 15 GHz [J].

Bower, GC ;

Falcke, H ;

Sault, RJ ;

Backer, DC .

ASTROPHYSICAL JOURNAL, 2002, 571 (02) :843-855

[5] The linear polarization of Sagittarius A*. I. VLA spectropolarimetry at 4.8 and 8.4 GHz [J].

Bower, GC ;

Backer, DC ;

Zhao, JH ;

Goss, M ;

Falcke, H .

ASTROPHYSICAL JOURNAL, 1999, 521 (02) :582-586

[6] BIMA observations of linear polarization in Sagittarius A* at 112 GHz [J].

Bower, GC ;

Wright, MCH ;

Falcke, H ;

Backer, DC .

ASTROPHYSICAL JOURNAL, 2001, 555 (02) :L103-L106

[7]

BOWER GC, 2003, UNPUB APJ

[8] Polarimetric imaging of the massive black hole at the galactic center [J].

Bromley, BC ;

Melia, F ;

Liu, SM .

ASTROPHYSICAL JOURNAL, 2001, 555 (02) :L83-L86

[9] Detection of circular polarization in M81 [J].

Brunthaler, A ;

Bower, GC ;

Falcke, H ;

Mellon, RR .

ASTROPHYSICAL JOURNAL, 2001, 560 (02) :L123-L126

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