Observations of Herbig-Haro objects and their surrounding dark clouds

Journal Article · Tue Apr 01 04:00:00 EST 1980 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157841· OSTI ID:5273710

Ho, P T.P.; Barrett, A H

A survey was conducted toward 29 Herbig-Haro objects in the (J, K) 1, 1lines of NH/sub 3/, followed by mapping of the two strongest sources in the NGC 1333 region and the Serpens region. Herbig-Haro objects are found to be associated with dense (n(H/sub 2/)>5 x 10/sup 3/ cm/sup -3/) neutral material, although these are not found to be the site of on-going star formation. Cloud fragmentation appears to have occurred in the regions mapped. Rotation is present with velocity gradients of 1--2 km s/sup -1/ pc/sup -1/. Dynamics and stability against collapse are discussed for these regions. Formation of stars of different spectral types is also discussed. In the case of NGC 1333, NH/sub 3/ results are used to constrain existing models of CO emission in the region.

• Research Organization: Department of Physics and Astronomy, University of Massachusetts
• OSTI ID: 5273710
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 237:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMMONIA
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMISTRY
COSMIC GASES
COSMOCHEMISTRY
DISTRIBUTION
ENERGY SPECTRA
FLUIDS
GASES
GRAVITATIONAL COLLAPSE
HYDRIDES
HYDROGEN COMPOUNDS
INTERSTELLAR SPACE
LINE BROADENING
LINE WIDTHS
MOLECULES
MOTION
NEBULAE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
PROTOSTARS
ROTATION
SPACE
SPATIAL DISTRIBUTION
SPECTRA
VELOCITY