STIS Spectra of M81's Nucleus

Details STIS Spectra of M81's Nucleus STIS Spectra of M81's Nucleus

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.9902f&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #99.02; Bulletin of the American Astronomical Society, Vol. 31, p.1518

Astronomy and Astrophysics

Astronomy

Scientific paper

We observed M81 with the STIS 0.1 arc-sec slit stepped across the nucleus in seven contiguous positions. The spectrum covered 630 nm to 683 nm with a dispersion of 0.52 angstroms per pixel. The blue and redshfited rotation velocity in the apparent disk of ionized gas increases toward the nucleus, with a velocity discontinuity of approximately 100 km/s across the nucleus. The maximum observed rotation occurs within 0.3 arc-sec (5 parsecs) of the center. The extremely broad Hα line (FWZI >= 10,000 km/s)is confined to the central 0.1 arc-sec. The preliminary central mass is 5 x 106/{sin(i)} Msun. We will discuss the observations, rotation models, and the implications for a massive black hole in the center of this nearest mini-Seyfert galaxy.

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