Open AccessNew Herbig–Haro objects and giant outflows in Orion
Author(s) -
Mader S. L.,
Zealey W. J.,
Parker Q. A.,
Masheder M. R. W.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02973.x
Subject(s) - physics , astrophysics , herbig–haro object , sky , molecular cloud , infrared , young stellar object , astronomy , parsec , serpens , flux (metallurgy) , star formation , stars , materials science , metallurgy
We present the results of a photographic and CCD imaging survey for Herbig–Haro (HH) objects in the L1630 and L1641 giant molecular clouds in Orion. The new HH flows were initially identified from a deep H α film from the recently commissioned AAO/UKST H α Survey of the southern sky. Our scanned H α and broad‐band R images highlight both the improved resolution of the H α survey and the excellent contrast of the H α flux with respect to the broad‐band R . Comparative IVN survey images allow us to distinguish between emission and reflection nebulosity. Our CCD H α , [S ii ], continuum and I ‐band images confirm the presence of a parsec‐scale HH flow associated with the Ori I‐2 cometary globule, and several parsec‐scale strings of HH emission centred on the L1641‐N infrared cluster. Several smaller outflows display one‐sided jets. Our results indicate that, for declinations south of ‐6° in L1641, parsec‐scale flows appear to be the major force in the large‐scale movement of optical dust and molecular gas.