BIMA observations of linear polarization in Sagittarius A* at 112 GHz

被引：26

作者：

Bower, GC

Wright, MCH

Falcke, H

Backer, DC

机构：

[1] Natl Radio Astron Observ, Socorro, NM 87801 USA

[2] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

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

[4] Max Planck Inst Radioastron, D-53121 Bonn, Germany

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 555卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies : active; Galaxy : center; polarization; radiation mechanisms : nonthermal; scattering;

D O I：

10.1086/323180

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report here Berkeley-Illinois-Maryland Association array observations of linear polarization in Sagittarius A*, the compact radio source in the Galactic center. These observations had a resolution of 20" x 5" oriented north-south. We do not detect linear or circular polarization at a level of 1.8% (1 sigma) at 112 GHz. This puts a new constraint on models that show a sharp change in linear polarization fraction at 100 GHz.

引用

页码：L103 / L106

页数：4

共 20 条

[1] Sagittarius A* polarization: No advection-dominated accretion flow, low accretion rate, and nonthermal synchrotron emission
Agol, E
[J]. ASTROPHYSICAL JOURNAL, 2000, 538 (02) : L121 - L124
[2] Aitken DK, 2000, ASTROPHYS J, V534, pL173, DOI 10.1086/312685
[3] Proper motion of the compact, nonthermal radio source in the Galactic center Sagittarius A*
Backer, DC
Sramek, RA
[J]. ASTROPHYSICAL JOURNAL, 1999, 524 (02) : 805 - 815
[4] The linear polarization of Sagittarius A*. II. VLA and BIMA polarimetry at 22, 43, and 86 GHz
Bower, GC
Wright, MCH
Backer, DC
Falcke, H
[J]. ASTROPHYSICAL JOURNAL, 1999, 527 (02) : 851 - 855
[5] Detection of circular polarization in the Galactic center black hole candidate Sagittarius A*
Bower, GC
Falcke, H
Backer, DC
[J]. ASTROPHYSICAL JOURNAL, 1999, 523 (01) : L29 - L32
[6] The linear polarization of Sagittarius A*. I. VLA spectropolarimetry at 4.8 and 8.4 GHz
Bower, GC
Backer, DC
Zhao, JH
Goss, M
Falcke, H
[J]. ASTROPHYSICAL JOURNAL, 1999, 521 (02) : 582 - 586
[7] Cornwell T, 1999, ASTR SOC P, V180, P151
[8] Falcke H, 2000, ASTRON ASTROPHYS, V362, P113
[9] MPM - AN ATMOSPHERIC MILLIMETER-WAVE PROPAGATION MODEL
LIEBE, HJ
[J]. INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, 1989, 10 (06): : 631 - 650
[10] Dynamical constraints on alternatives to supermassive black holes in galactic nuclei
Maoz, E
[J]. ASTROPHYSICAL JOURNAL, 1998, 494 (02) : L181 - L184

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