On the Possible Pulsar Wind Nebula Counterpart of the TeV Source HESS J1831-098
ATel #12463; Rohan Abichandani (Commonwealth School), Maya Bode Mathur (Commonwealth School), Jeremy J. Drake (CfA | Harvard & Smithsonian), Antonella Fruscione (CfA | Harvard & Smithsonian), Nicholas P. Lee (CfA | Harvard & Smithsonian), Kenny Glotfelty (CfA | Harvard & Smithsonian)
on 1 Feb 2019; 22:58 UT
Credential Certification: Jeremy J. Drake (jdrake@cfa.harvard.edu)
Subjects: Radio, X-ray, Gamma Ray, TeV, VHE, Pulsar
We report the detection of an X-ray source at the position of the pulsar PSR J1831-0952 at the coordinates 18:31:34 -09:52:01 with the Chandra X-ray Observatory ACIS-I detector. A pulsar wind nebula associated with PSR J1831-0952 was suggested as a possible counterpart to a TeV source detected using the High Energy Stereoscopic System (HESS J1831-098) by Sheidaei et al., (2011, International Cosmic Ray Conference, 7, 244). Chandra observed PSR J1831-0952 on 2016 August 11 for an exposure time of 27.8 ks. A preliminary analysis suggests that the source could be extended, with a possible size of several arcsec. A total of 30 +/- 7 net counts were detected in a circular source region of radius 14 arcsec. For an estimated intervening neutral hydrogen column density of 3e21 cm^-2, the best-fit power-law model for the extracted source counts in the 0.5-7 keV band has an index gamma=0.90 +/- 0.26. Four other X-ray sources are apparent in the HESS 1-sigma error circle of approximately 0.3 arcmin in Fig. 1 of Sheidaei et al, with PSR J1831-0952 lying at the extremity of this circle. No firm counterparts for the four additional X-ray sources were found in existing catalogs. It is likely that the source detected here that we associate with PSR J1831-0952, corresponds to the XMM-Newton source XGPS-I J183134-095155 that was associated with USNO-A2.0 0750-13416775 by Hands et al. (2004, MNRAS, 351, 31).
