UNDERSTANDING THE STAR-FORMATION PROCESS IN THE FILAMENTARY DARK CLOUD GF-9 - NEAR-INFRARED OBSERVATIONS

Citation
Dr. Ciardi et al., UNDERSTANDING THE STAR-FORMATION PROCESS IN THE FILAMENTARY DARK CLOUD GF-9 - NEAR-INFRARED OBSERVATIONS, The Astronomical journal (New York), 116(1), 1998, pp. 349-359
Citations number
44
Categorie Soggetti
Astronomy & Astrophysics
ISSN journal
00046256
Volume
116
Issue
1
Year of publication
1998
Pages
349 - 359
Database
ISI
SICI code
0004-6256(1998)116:1<349:UTSPIT>2.0.ZU;2-S
Abstract
We have performed a near-infrared JHK survey of a dense core and a dif fuse filament region within the filamentary dark cloud GF 9 (LDN 1082) . The core region is associated with the IRAS point source PSC 20503 6006 and is suspected of being a site of star formation. The diffuse filament region has no associated IRAS point sources and is likely qui escent. We find that neither the core nor the filament region appears to contain a Class I or Class II young stellar object. As traced by th e dust extinction, the core and filament regions contain 26 and 22 M., respectively, with an average H-2 volume density for both regions of similar to 2500 cm(-3). The core region contains a centrally condensed extinction maximum with a peak extinction of A(V) greater than or sim ilar to 10 mag that appears to be associated with the IRAS point sourc e. The average H-2 volume density of the extinction core is similar to 8000 cm(-3). The dust within the filament, however, shows no sign of a central condensation and is consistent with a uniform-density cylind rical distribution.