XMM-Newton observations of the first unidentified TeV gamma-ray source TeV J2032+4130

Abstract

(abridged) The first unidentified very high energy gamma ray source (TeV J2032+4130) in the Cygnus region has been the subject of intensive search for a counterpart source at other wavelengths. A deep ($\approx 50$ ksec) exposure of TeV J2032+4130 with \textit{XMM-Newton} has been obtained. The contribution of point sources to the observed X-ray emission from TeV J2032+4130 is subtracted from the data. The point-source subtracted X-ray data are analyzed using blank sky exposures and regions adjacent to the position of TeV J2032+4130 in the field of view covered by the XMM-Newton telescopes to search for diffuse X-ray emission. An extended X-ray emission region with a full width half maximum (FWHM) size of $\approx 12$ arc min is found. The centroid of the emission is co-located with the position of TeV J2032+4130.The energy spectrum of the emission coinciding with the position and extension of TeV J2032+4130 can be modeled by a power-law model with a photon index $\Gamma =1.5\pm 0.2_{\mathrm{stat}}\pm 0.3_{\mathrm{sys}}$ and an energy flux integrated between 2 and 10 keV of $f_{2-10\mathrm{keV}}\approx 7\cdot 10^{-13}$ ergs/(cm${}^2$ s) which is lower than the very high energy gamma-ray flux observed from TeV J2032+4130. We conclude that the faint extended X-ray emission discovered in this observation is the X-ray counterpart of TeV J2032+4130. Formally, it can not be excluded that the extended emission is due to an unrelated population of faint, hot ($k_{B}T\approx 10$ keV) unresolved point-sources which by chance coincides with the position and extension of TeV J2032+4130. We discuss our findings in the frame of both hadronic and leptonic gamma-ray production scenarios.

5 Pages, 3 Figures, accepted for publication in A&A

References in corpus (8)

• Discovery of TeV Gamma-Ray Emission from the Cygnus Region of the Galaxy
• Detection of extended very-high-energy gamma-ray emission towards the young stellar cluster Westerlund 2
• Unveiling the Cygnus OB2 stellar population with Chandra
• TeV gamma-rays and neutrinos from photo-disintegration of nuclei in Cygnus OB2
• Evidence for TeV gamma ray emission from TeV J2032+4130 in Whipple archival data
• Observations of the Unidentified TeV Gamma-Ray Source TeV J2032+4130 with the Whipple Observatory 10 m Telescope
• The population of radio sources in the field of the unidentified gamma-ray source TeV J2032+4130
• Transient X-ray sources in the field of the Unidentified Gamma-Ray Source TeV J2032+4130 in Cygnus

Cited by in corpus (4)

• Spectral evolution of non-thermal electron distributions in intense radiation fields
• The Molecular Environment of the Gamma-ray Source TeV J2032+4130
• Status of Very High Energy gamma-ray Astronomy as of early 2008
• Note on XMM-Newton observations of the first unidentified TeV gamma-ray source TeV J2032+4130 by Horns et al. astro-ph/0705.0009