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2002ApJ...575..354G - Astrophys. J., 575, 354-377 (2002/August-2)

Chandra study of young stellar objects in the NGC 1333 star-forming cloud.


Abstract (from CDS):

NGC 1333, a highly active star formation region within the Perseus molecular cloud complex, has been observed with the ACIS-I detector on board the Chandra X-Ray Observatory. In our image with a sensitivity limit of ∼1028 ergs.s–1, we detect 127 X-ray sources, most with subarcsecond positional accuracy. While 32 of these sources appear to be foreground stars and extragalactic background, 95 X-ray sources are identified with known cluster members. The X-ray luminosity function of the discovered young stellar object (YSO) population spans a range of logLX≃28.0-31.5 ergs.s–1 in the 0.5-8 keV band, and absorption ranges from logNH≃20 to 23 cm–2. Most of the sources have plasma energies between 0.6 and 3 keV, but a few sources show higher energies up to ∼7 keV. Comparison with K-band source counts indicates that we detect all of the known cluster members with K<12 and about half of the members with K>12. K≃11, the peak of the K-band luminosity function, corresponds to 0.2-0.4 M stars for a cluster age of ∼1 Myr. We detect seven of the 20 known YSOs in NGC 1333 producing jets or molecular outflows as well as one deeply embedded object without outflows. No evident difference in X-ray emission of young stars with and without outflows is found. Based on the complete subsample of T Tauri stars, we also find no difference in X-ray properties and X-ray production mechanism of stars with and without K-band excess disks. Several other results are obtained. We suggest that the X-ray emission from two late B stars that illuminate the reflection nebula originates from unresolved late-type companions. Two T Tauri stars are discovered in the ACIS images as previously unknown components of visual binaries. A good correlation LX∝J is seen, which confirms the well-known relation LX∝Lbol found in many star-forming regions. Based on spectral analysis for the X-ray counterpart of SVS 16, we establish that the column density NH is much lower than that expected from near-IR photometry so that its X-ray luminosity, logLX≃30.6 ergs.s–1, is not unusually high.

Abstract Copyright:

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 1333 - Stars: Early-Type - Stars: Pre-Main-Sequence - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJ/575/354): table1.dat notes.dat table2.dat>

Nomenclature: Table 1, col(1): [GFT2002] NNN (Nos 1-109) = Table 1, col(2): CXONGC1333 JHHMMSS.s+DDMMSS N=109.

Simbad objects: 158

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