Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

Details Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

2012-01-10

arxiv.org/abs/1201.1973v1

The Astrophysical Journal Letters, 745:L22 (5pp), 2012

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

14 pages, 4 figures

Scientific paper

10.1088/2041-8205/745/2/L22

We report the observation of TeV gamma-rays from the Cygnus region using the ARGO-YBJ data collected from 2007 November to 2011 August. Several TeV sources are located in this region including the two bright extended MGRO J2019+37 and MGRO J2031+41. According to the Milagro data set, at 20 TeV MGRO J2019+37 is the most significant source apart from the Crab Nebula. No signal from MGRO J2019+37 is detected by the ARGO-YBJ experiment, and the derived flux upper limits at 90% confidence level for all the events above 600 GeV with medium energy of 3 TeV are lower than the Milagro flux, implying that the source might be variable and hard to be identified as a pulsar wind nebula. The only statistically significant (6.4 standard deviations) gamma-ray signal is found from MGRO J2031+41, with a flux consistent with the measurement by Milagro.

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