Deep CHANDRA X-RAY OBSERVATORY imaging study of the
very young stellar cluster IC 348
Thomas Preibisch & Hans Zinnecker
Astronomical Journal, 122, 866 (2001)
We have obtained a deep (53 ksec) X-ray image
of the very young stellar cluster IC 348 with the
Advanced CCD Imaging Spectrometer on board the
Chandra X-Ray Observatory. In our image with a sensitivity limit
of ~ 1 x 10^28 erg/sec
(more than 10 x deeper than our
ROSAT images of IC 348), 215 X-ray sources are detected.
While 115 of these sources can be identified with known
cluster members, 58 X-ray sources are most likely new, still
unidentified cluster members. About 80% of all known cluster members
with masses between ~ 0.15 M_sun and 2 M_sun are visible
as X-ray sources in our image.
We discover X-ray emission at levels of ~ 10^28 erg/sec
from 4 of 13 known brown dwarfs
and from 3 of 12 brown dwarf candidates in IC 348.
We also detect X-ray emission from two deeply embedded objects,
presumably class I protostars, south of the
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