A radio and near-infrared mini-survey of the MGRO J2019+37 complex

TL;DR

This study conducts radio and near-infrared observations of the MGRO J2019+37 gamma-ray source to identify potential counterparts and understand its nature, combining data from GMRT and Calar Alto observatory.

Contribution

First combined radio and infrared survey of MGRO J2019+37, providing initial source catalog and cross-correlation with X-ray data.

Findings

Identification of radio sources within the region

Near-infrared sources correlated with radio detections

Preliminary cross-correlation with X-ray observations

Abstract

MGRO J2019+37 is an unidentified source of very high energy gamma-rays originally reported by the MILAGRO collaboration as the brightest TeV source in the Cygnus region. Despite the poor angular resolution of MILAGRO, this object seems to be most likely an extended source or, alternatively, a superposition of point-like TeV sources. In order to contribute to the understanding of this peculiar object, we have mosaiced it with the Giant Metrewave Radio Telescope (GMRT) in Pune, India, at the 610 MHz frequency covering a field of view of about 6 square degrees down to a typical rms noise of a few tenths of mJy. We also observed the central square degree of this mosaic in the near infrared Ks-band using the 3.5 m telescope and the OMEGA2000 camera at the Calar Alto observatory (Spain). We present here a first account of our observations and results, together with a preliminar cross correlation of the radio and infrared source catalog as well as a correlation with the available X-ray observations of the region.