Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1005y&link_type=abstract
American Astronomical Society, HEAD meeting #9, #10.05; Bulletin of the American Astronomical Society, Vol. 38, p.364
Other
Scientific paper
We present a deep, 282 ksec Chandra High-Energy Transmission Grating Spectrometer observation of the Low-Luminosity Active Galactic Nucleus (LLAGN) M81*. Owing to the nearness and brightness of M81*, we definitively detect and resolve spectral lines that probe the structure and dynamics of the M81* accretion flow. The accretion flow in M81* and other LLAGN is hypothesized to be qualitatively different than that of standard bright AGN. Specifically, M81* has many properties in common with the even fainter LLAGN at our Galactic center, Sgr A*.
The lines that we identify in the time-averaged spectrum of M81* originate within 18 kpc of the nucleus. These lines include Fe XXVI (red-shifted by 3,000 km/s), Fe XXV and Fe K alpha fluorescence, Si XIII, Si K alpha fluorescence, Mg XII, Ne X and O VIII. The fluorescence features especially probe the structure of any cold matter near the hot accretion flow. Furthermore, a number of these lines are velocity broadened with FWHM of 1,000-1,500 km/s. We discuss how these lines can be used to constrain the accretion physics, including the properties of any radiatively inefficient flow, standard disk and/or jet components.
Canizares Calude R.
Markoff Sera
Marshall Herman L.
Nowak Maciej A.
Young Andrew J.
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