Accurate positioning of four INTEGRAL selected isolated NSs

Details Accurate positioning of four INTEGRAL selected isolated NSs Accurate positioning of four INTEGRAL selected isolated NSs

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.2073i&link_type=abstract

Chandra Proposal ID #07508236, p.1

Physics

Chandra Proposal Id #07508236

Scientific paper

Based on the newly discovered hard X-ray spectral characteristics of AXPs and SGRs we selected 4 dim persistent unidentified radio-quiet INTEGRAL sources with a relatively bright ROSAT source in their positional uncertainty regions. In the best case we rely upon a ROSAT HRI position (3" radius position uncertainty) with no clear optical counterpart down to V~22, making it a very reliable AXP candidate (the V upper limit excludes 90% of the known LMXBs). However, several tens of IR sources are expected in a 3" radius circular region on the Galactic plane. Chandra is currently the only mission able to obtain source positions with a sub-arcsec accuracy needed to sort out the right counterparts of the four sources. Already granted GO XMM observations will be used to look for pulsations, while Optical/IR observations will be carried out during the next months. The latter observations would greatly take advantage of the Chandra positions.

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