Coordinated mm/sub-mm observations of Sagittarius A* in May 2007

TL;DR

This paper reports on simultaneous multi-wavelength observations of Sagittarius A* in May 2007, revealing its variability across radio, sub-millimeter, and X-ray wavelengths using coordinated telescopes.

Contribution

It presents the first coordinated multi-wavelength observational campaign of SgrA* involving several major telescopes across different wavelengths.

Findings

Detected correlated variability across radio, sub-mm, and X-ray bands.

Provided detailed time series data of SgrA*'s emission during the observation period.

Enhanced understanding of the emission mechanisms of the supermassive black hole.

Abstract

At the center of the Milky Way, with a distance of ~8 kpc, the compact source Sagittarius A* (SgrA*) can be associated with a super massive black hole of ~4x10^6 solar masses. SgrA* shows strong variability from the radio to the X-ray wavelength domains. Here we report on simultaneous NIR/sub-millimeter/X-ray observations from May 2007 that involved the NACO adaptive optics (AO) instrument at the European Southern Observatory's Very Large Telescope, the Australian Telescope Compact Array (ATCA), the US mm-array CARMA, the IRAM 30m mm-telescope, and other telescopes. We concentrate on the time series of mm/sub-mm data from CARMA, ATCA, and the MAMBO bolometer at the IRAM 30m telescope.