ALMA Continuum Spectrum of the M87 Nucleus
Quasi-simultaneous continuum observations at bands-3, 6, 7, and 9
1 The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuou-ku, Sagamihara, Kanagawa 252-5210, Japan
2 INAF, Istituto di Radioastronomia, via Gobetti 101, Bologna I-40129, Italy
3 National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan
4 Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
a e-mail: email@example.com
Published online: 9 December 2013
We report the preliminary result of ALMA continuum observations toward the M87 nucleus at thirtysix frequencies (quasi-simultaneously) ranging from 90 GHz to 700 GHz. We detected the nuclear component at almost all the frequency points. We found a spectral break at the millimeter regime: a nearly flat spectrum at lower frequencies and a steep spectrum at higher frequencies. The spectral profile indicates a possible physical situation in the vicinity of the central supermassive black hole.
© Owned by the authors, published by EDP Sciences, 2013
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