Volume 567, July 2014
|Number of page(s)||8|
|Published online||14 July 2014|
XMM-Newton and Chandra X-ray follow-up observations of the VHE gamma-ray source HESS J1507-622
1 ITPA, Universität Würzburg, Campus Hubland Nord, Emil-Fischer-Str. 31, 97074 Würzburg, Germany
e-mail: firstname.lastname@example.org, Omar.Tibolla@astro.uni-wuerzburg.de
2 Landessternwarte, Universität Heidelberg, Königstuhl 12, 69117 Heidelberg, Germany
3 IRFU/DSM/CEA, CEA Saclay, 91191 Gif-sur-Yvette, Cedex, France
Received: 26 April 2013
Accepted: 12 May 2014
Context. The discovery of the unique source HESS J1507-622 in the very high energy (VHE) range (100 GeV−100 TeV) opened new possibilities to study the parent population of ultra-relativistic particles found in astrophysical sources and underlined the possibility of new scenarios/mechanisms crucial for understanding the underlying astrophysical processes in nonthermal sources.
Aims. The follow-up X-ray (0.2−10 keV) observations on HESS J1507-622 are reported, and possibilities regarding the nature of the VHE source and that of the newly discovered X-ray sources are investigated.
Methods. We obtained observations with the X-ray satellites XMM-Newton and Chandra. Background corrections were applied to the data to search for extended diffuse emission. Since HESS J1507-622 covers a large part of the field of view of these instruments, blank-sky background fields were used.
Results. The discovery of several new X-ray sources and a new, faint, extended X-ray source with a flux of ~ 6 × 10-14ergcm-2s-1 is reported. Interestingly, a new, variable point-like X-ray source with a flux of ~ 8 × 10-14ergcm-2s-1 appeared in the 2011 observation, which was not detected in the previous X-ray observations.
Conclusions. The X-ray observations revealed a faint, extended X-ray source that may be a possible counterpart for HESS J1507-622. This source could be an X-ray pulsar wind nebula (PWN) remnant of the larger gamma-ray PWN, which is still bright in IC emission. Several interpretations are proposed to explain the newly detected variable X-ray source.
Key words: astroparticle physics / X-rays: individuals: HESS J1507-622 / cosmic rays / Galaxy: general / gamma rays: general
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.