Simultaneous NIR/sub-mm observation of flare emission from SgrA*

TL;DR

This study presents simultaneous near-infrared and sub-millimeter observations of Sgr A* flares, revealing a delay in emission that supports an adiabatic expansion model of the source.

Contribution

First simultaneous NIR/sub-mm observation and modeling of Sgr A* flare emission, demonstrating a delay consistent with adiabatic expansion.

Findings

Sub-mm emission lags NIR by about 1.5 hours.

Flare emission delay explained by adiabatic expansion.

Supports expansion models for black hole flare emission.

Abstract

We report on a successful, simultaneous observation and modeling of the sub-millimeter to near-infrared flare emission of the Sgr A* counterpart associated with the super-massive black hole at the Galactic center. Our modeling is based on simultaneous observations that have been carried out on 03 June, 2008 using the NACO adaptive optics (AO) instrument at the ESO VLT and the LABOCA bolometer at the APEX telescope. Inspection and modeling of the light curves show that the sub-mm follows the NIR emission with a delay of 1.5+/-0.5 hours. We explain the flare emission delay by an adiabatic expansion of the source components.