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 cluster center.

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ROSAT and CHANDRA images of IC 348 can be found here.

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