XMM-Newton study of the Serpens star forming region
Astronomy and Astrophysics, 410, 951-959 (2003)
We analyze a XMM-Newton X-ray observation
of the Serpens dark cloud with
a total MOS-equivalent exposure time of 57 ksec.
We find 45 individual X-ray sources.
None of the class 0 protostars, only one of the class I protostars,
and two of the flat-spectrum objects in the region are detected in X-rays.
The optically invisible flat-spectrum source EC 95, a very young intermediate
is the strongest X-ray source in the Serpens cloud.
The analysis of its X-ray spectrum shows that
the hydrogen column density towards EC 95 is considerably lower than
expected from the extinction determined from near-IR spectroscopy and
photometry. Possible reasons for this inconsistency are discussed.
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