2006A&A...451..845B


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.15CEST16:51:31

2006A&A...451..845B - Astronomy and Astrophysics, volume 451, 845-850 (2006/6-1)

Radio linear and circular polarization from M 81*.

BRUNTHALER A., BOWER G.C. and FALCKE H.

Abstract (from CDS):

We present results from archival and new Very Large Array (VLA) data observations to investigate the long term behavior of the circular polarization of M 81*, the nuclear radio source in the nearby galaxy M 81. We also used the Berkeley-Illinois-Maryland Association (BIMA) array to observe M 81* at 86 and 230GHz. M 81* is unpolarized in the linear sense at a frequency as high as 86GHz and shows variable circular polarization at a frequency as high as 15GHz. The spectrum of the fractional circular polarization is inverted in most of our observations. The sign of circular polarization is constant over frequency and time. The absence of linear polarization sets a lower limit to the accretion rate of 10–7M/yr. The polarization properties are strikingly similar to the properties of Sgr A*, the central radio source in the Milky Way. This supports the hypothesis that M 81* is a scaled up version of Sgr A*. On the other hand, the broad band total intensity spectrum declines towards milimeter wavelengths which differs from previous observations of M 81* and also from Sgr A*.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: Messier Number: M 81 - polarization - radio continum: galaxies - galaxies: nuclei

CDS comments: Paragraph 2.2. Sources J1056+714 and J1048+701 not in Simbad.

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2420 2
2 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SN.IIb 1220 1
3 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3879 5
4 6C 095456+654857 BLL 09 58 47.2452838930 +65 33 54.821524491     17.0 15.75   ~ 603 1
5 6C 104451+715930 QSO 10 48 27.6207767205 +71 43 35.941655031     19.0 17.49   ~ 179 1
6 7C 105328.60+702751.00 QSO 10 56 53.61750690 +70 11 45.9156324   18.5 18.5 19.32   ~ 85 1
7 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2626 2
8 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3597 1
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3235 3

    Equat.    Gal    SGal    Ecl

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2019.09.15-16:51:31

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