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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308530.0, MPI für Astronomie / Publikationen_mpia
A search for optical outflows from brown dwarfs in the Chamaeleon I molecular cloud
Authors:Wang, H.; Henning, T.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:985
End Page:994
Audience:Not Specified
Abstract / Description:A deep and wide-field HH object survey has been carried out toward the Chamaeleon I (Cha I) molecular cloud with a sky coverage of 1deg×2deg, which embraces the entire Cha I molecular cloud. In total, 18 HH objects have been detected, including the previously known objects HH 48-51. The newly discovered HH objects are named HH 905-918. The possible exciting sources of the detected HH objects are discussed based on the morphology and locations of the HH objects and on results of previous surveys. Although more than 40 brown dwarfs or brown dwarf candidates have been detected in Cha I, no compelling evidence for optical outflows from brown dwarfs has been found in our images at the detection limit of 2.3×10-20 W m-2 arcsec-2 (3 sigma) in the [S II] lambdalambda6717, 6731 emission. The typical peak brightness of HH objects in Cha I is about 20 times above our detection limit. We conclude that the brightness of optical outflows from substellar objects should be about 20 times lower than that of outflows from young solar-type stars if all the HH objects detected in Cha I are driven by young stars. In three cases-i.e., HH 51, 908, and 909-however, there are hints of a connection between HH objects and the nearby brown dwarfs or very low mass stars.
Free Keywords:ISM: Herbig-Haro Objects; ISM: Individual: Name: Chamaeleon I; ISM: Jets and Outflows; Stars: Formation; Stars: Low-Mass; Brown Dwarfs
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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