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NIR triggered observations of Sgr A* at 43 GHz

Published online by Cambridge University Press:  09 February 2017

C. Rauch
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: crauch@mpifr-bonn.mpg.de, tkrichbaum@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, azensus@mpifr-bonn.mpg.de, rslu@mpifr-bonn.mpg.de
E. Ros
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: crauch@mpifr-bonn.mpg.de, tkrichbaum@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, azensus@mpifr-bonn.mpg.de, rslu@mpifr-bonn.mpg.de Observatori Astrònomic & Dep. d’Astronomia i Astrofísica, Univ. de València, E-46071, Spain
T. P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: crauch@mpifr-bonn.mpg.de, tkrichbaum@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, azensus@mpifr-bonn.mpg.de, rslu@mpifr-bonn.mpg.de
A. Eckart
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: crauch@mpifr-bonn.mpg.de, tkrichbaum@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, azensus@mpifr-bonn.mpg.de, rslu@mpifr-bonn.mpg.de I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de, shahzaman@ph1.uni-koeln.de, peissker@ph1.uni-koeln.de
J. A. Zensus
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: crauch@mpifr-bonn.mpg.de, tkrichbaum@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, azensus@mpifr-bonn.mpg.de, rslu@mpifr-bonn.mpg.de
R.-S. Lu
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: crauch@mpifr-bonn.mpg.de, tkrichbaum@mpifr-bonn.mpg.de, ros@mpifr-bonn.mpg.de, azensus@mpifr-bonn.mpg.de, rslu@mpifr-bonn.mpg.de
B. Shahzamanian
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de, shahzaman@ph1.uni-koeln.de, peissker@ph1.uni-koeln.de
K. Mužić
Affiliation:
Nucleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile email: koraljka.muzic@mail.udp.cl
F. Peißker
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany email: eckart@ph1.uni-koeln.de, shahzaman@ph1.uni-koeln.de, peissker@ph1.uni-koeln.de
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Abstract

The compact radio and near-infrared (NIR) source Sagittarius A* has been observed in the context of two NIR triggered global VLT and VLBA campaigns at 43 GHz (7 mm) on May 16-18 2012 and October 4 2014. While on October 4 2014 Sgr A* remained in a quiescent state, a NIR flare on May 17 2012 is accompanied by an increase in flux density of 0.22 Jy at 7 mm delayed by 4.5±0.5 h. Additionally, Sgr A* seems to develop a weak secondary radio off-core component of 0.02 Jy at a position angle of 140° and an angular distance of 1.5 mas shortly before the peak of the flare. This spatial extension and the time delay are in the range of expected values for events casually connected by adiabatic expansion.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

References

Brinkerink, C. D., Müller, C., Falcke, H. et al. 2016, MNRAS 462 1382-1392 CrossRefGoogle Scholar
Eckart, A., Genzel, R., Ott, T., & Schödel, R. 2002, MNRAS, 331, 917 CrossRefGoogle Scholar
Ortiz-León, G., Johnson, M. D., Doeleman, S. S. et al. 2016, ApJ, 824: 40 CrossRefGoogle Scholar
Rauch, C., Ros, E., Krichbaum, T. P., et al. 2016, A&A, 587, A37 Google Scholar
Shahzamanian, B., Eckart, A., Valencia-S., M., et al. 2015, A&A, 576, A20 Google Scholar
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