An X-ray counterpart of HESS J1427-608 discovered with Suzaku

Abstract

We report the discovery of an X-ray counterpart of the unidentified very high energy gamma-ray source HESS J1427-608. In the sky field coincident with HESS J1427-608, an extended source was found in the 2-8 keV band, and was designated as Suzaku J1427-6051. Its X-ray radial profile has an extension of sigma=0.9' +/- 0.1' if approximated by a Gaussian. The spectrum was well fitted by an absorbed power-law with N_H=(1.1 +/- 0.3) times 10^23 cm^-2, Gamma=3.1 +0.6/-0.5, and the unabsorbed flux F_X=(9 +4/-2) times 10^-13 erg s^-1 cm^-2 in the 2-10 keV band. Using XMM-Newton archive data, we found seven point sources in the Suzaku source region. However, because their total flux and absorbing column densities are more than an order of magnitude lower than those of Suzaku J1427-6051, we consider that they are unrelated to the Suzaku source. Thus, Suzaku J1427-6051 is considered to be a truly diffuse source and an X-ray counterpart of HESS J1427-608. The possible nature of HESS J1427-608 is discussed based on the observational properties.

accepted to PASJ

References in corpus (3)

• Teraelectronvolt Astronomy
• HESS VHE Gamma-Ray Sources Without Identified Counterparts
• AKARI-CAS --- Online Service for AKARI All-Sky Catalogues

Cited by in corpus (7)

• HESS J1640-465 -- a Gamma-ray emitting pulsar wind nebula ?
• Discovery of X-ray Emission from the Galactic Supernova Remnant G32.8-0.1 with Suzaku
• Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427$-$608, HESS J1458$-$608, and new VHE $\gamma$-ray source candidates
• HESS J1427-608: an unusual hard unbroken $\gamma -$ray spectrum in a very wide energy range
• Observations of the $\gamma$-ray pulsar J1932+1916 in X-rays
• Search for continuous gravitational waves from HESS~J1427-608 with a hidden Markov model
• Suzaku Observations of the old pulsar wind nebula candidate HESS J1356-645