Paper:	ALMA Cycle-0 Observation of the Sombrero Galaxy (M104)
Volume:	476, New Trends in Radio Astronomy in the ALMA Era
Page:	293
Authors:	Doi, A.; Hada, K.; Nakanishi, K.; Kohno, K.; Terashima, Y.; Kawaguchi, T.; Sawada-Satoh, S.; Akiyama, K.; Ozaki, S.
Abstract:	We present a progress report of the ALMA cycle 0 observation for point source photometry toward the nucleus in the Sombrero galaxy. Observation was performed quasi-simulteneously at fifteen sideband frequencies in the band-3, 6, 7 and 9 to obtain a continuum spectrum for understanding of accretion and outflow phenomena in about 10 Schwarzschild radius or less. We found a mildly rising spectrum at ∼ 90–700 GHz for the radio nucleus. This is the most direct and promising approach to the vicinity of the event horizon, in advance of a future submm VLBI.

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