Publications
of the
MPIfR
Optical & Infrared
Interferometry Group
T. Preibisch and H. Zinnecker:
Deep CHANDRA X-ray observatory imaging study
of the very young stellar cluster IC 348
Astronomical Journal 122, 866-875 (2001)
Abstract.
e 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 cluster center.
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