The millimeter variability of M81*

Details The millimeter variability of M81* The millimeter variability of M81*

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jphcs..54..349s&link_type=abstract

"Journal of Physics: Conference Series, Volume 54, Proceedings of "The Universe Under the Microscope - Astrophysics at High Angu

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

M81*, the nucleus of the nearby spiral galaxy M81 (NGC 3031) is an LLAGN with a luminosity < 10-5times the Eddington luminosity of the related supermassive black hole. It appears to have very similar characteristics to Sagittarius A (Sgr A*), the radiative counterpart of the black hole at the center of the Milky Way. Here, we present simultaneous observations at 3 and 1 mm that were obtained within the framework of a coordinated, multi-wavelength campaign on M81*. We fhd that at mm-wavelengths M81* is a continuously variable source with the higher variability observed at the shorter wavelength. The variability at 3 and 1 mm appears to be correlated. The data show that M81* is indeed a system with very similar physical properties to Sgr A*. The observed variability time scales point to an upper size limit of the emitting region of the order 25 Schwarzschild radii. The obtained data clearly demonstrate the usefulness and, above all, necessity of simultaneous multi-wavelength observations of LLAGN.

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