https://doi.org/10.1051/epjconf/20136108008
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: akihiro.doi@vsop.isas.jaxa.jp
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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
