2 research outputs found
BeppoSAX/PDS serendipitous detections at high galactic latitudes
At a flux limit of ~10^(-11) erg/cm2/s in the 20-100 keV band, the PDS
instrument on-board BeppoSAX offers the opportunity to study the extragalactic
sky with an unprecedented sensitivity. In this work we report on the results of
a search in the BeppoSAX archive for serendipitous high energy sources at high
galactic latitudes (|b| > 13 deg). We have defined a set of twelve regions in
which the PDS/MECS cross-calibration constant is higher than the nominal value.
We attribute this mismatch to the presence of a serendipitous source in the PDS
field of view.In four cases the likely high energy emitter is also present in
the MECS field of view. In these cases, we have performed a broad band spectral
analysis (1.5-100 keV) so as to understand the source spectral behaviour and
compare it with previous BeppoSAX observations when available. In eight cases
the identification of the source likely to provide the PDS spectrum is based on
indirect evidence (extrapolation to lower energies and/or comparison to
previous observations). This approach leads to the discovery of six new hard
X-ray emitting objects (PKS 2356-611, 2MASX J14585116-1652223, NGC 1566, NGC
7319, PKS 0101-649 and ESO 025-G002) and to the presentation the PDS spectrum
of NGC 3227 for the first time. In the remaining five cases we provide extra
BeppoSAX observations that can be compared with measurements which are already
published and/or in the archive.Comment: 16 pages, 9 figures, accepted for publication in A&A, main journa