2009/02/26 by M. T. Beltran, M. T. Beltrán, F. Massi +4 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Context (archaeology) #Geology #Herbig–Haro object #Molecular cloud #Physics #Population #Sky #Star formation #Stars #Stellar, planetary, and galactic studies #Telescope #Young stellar object #astro-ph.GA
paper · pdf · doi:10.1051/0004-6361/200811540
Comments: 19 pages, 5 tables, 7 figures. Accepted for publication in A&A
arxiv created 2009/02/26 · openalex publication_date 2009/03/27 · arxiv updated 2015/05/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
<i>Context. <i/>IC 1396N is a bright-rimmed cloud associated with an intermediate-mass star-forming region, where a number of Herbig-Haro objects, H<sub>2<sub/> jet-like features, CO molecular outflows, and millimeter compact sources have been observed.<i>Aims. <i/>We study the complex structure of the IC 1396N core and the molecular outflows detected in the region in detail and reveal the presence of additional YSOs inside this globule.<i>Methods. <i/>We carried out a deep survey of the IC 1396N region in the broadband filters and deep high-angular resolution observations in the <i>H<i/><sub>2<sub/> narrowband filter with NICS at the TNG telescope. The completeness limits in the 2MASS standard are , , and .<i>Results. <i/>A total of 736 sources have been detected in all three bands within the area where the <i>JHK'<i/> images overlap. There are 128 sources detected only in <i>HK'<i/>, 67 detected only in <i>K'<i/>, and 79 detected only in <i>JH<i/>. We found only a few objects exhibiting a near-infrared excess and no clear signs of clustering of sources towards the southern rim. In the case of triggered star formation in the southern rim of the globule, this could be very recent, because it is not shown through Near-Infrared imaging alone. The H<sub>2<sub/> emission is complex and knotty and shows a large number of molecular hydrogen features spread over the region, testifying to recent star-formation activity throughout the whole globule. This emission is resolved into several chains or groups of knots that sometimes show a jet-like morphology. The shocked cloudlet model scenario previously proposed to explain the V-shaped morphology of the CO molecular outflow powered by the intermediate-mass YSO BIMA 2 seems to be confirmed by the presence of H<sub>2<sub/> emission at the position of the deflecting western clump. New possible flows have been discovered in the globule, and some of them could be very long. In particular, the YSO BIMA 3 could be powering an old and poorly collimated outflow.