XMM-Newton study of the star forming region NGC 1333
Astronomy and Astrophysics, 401, 543-555 (2003)
We analyze the data of a deep XMM-Newton X-ray imaging observation
of the NGC 1333 star forming region.
The observation covered a period of about 14 hours and
has a total MOS-equivalent exposure time of 235 ksec.
In addition to 46 bright X-ray sources revealed by
source detection routines, we
find weak X-ray emission at the positions of 40 X-ray sources
detected originally in a recent Chandra observation of NGC 1333.
The XMM-Newton countrates of most sources agree well with their
in the Chandra data; about 80\% of the sources vary by a
factor of less than
3 between the two X-ray observations which are separated by 18 month.
The X-ray lightcurves of several sources reveal large flares with
parameters typical for X-ray active young stellar objects.
We also construct and analyze the X-ray spectra of the
stronger sources and derive plasma temperatures between
~0.7 keV and ~3 keV for the T Tauri stars in NGC 1333,
and higher temperatures up to ~12 keV
for flaring sources and deeply embedded young stellar objects.
We consider in detail the X-ray properties of the optically invisible
infrared source SVS 16, which showed a large X-ray flare during
our observation. Its X-ray spectrum confirms that
the hydrogen column density towards SVS 16 is much lower than
expected from the extinction determined from near-IR spectroscopy and
photometry. The reason for this inconsistency remains unclear.
Finally, we search for, but do not detect any X-ray emission from
HH 7-11 or one of the other Herbig-Haro objects in NGC 1333.
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