SIMBAD references

2007ApJ...671..536C - Astrophys. J., 671, 536-545 (2007/December-2)

NICMOS observations of shocked H2 in Orion.


Abstract (from CDS):

HST NICMOS narrowband images of the shocked molecular hydrogen emission in OMC-1 are analyzed to reveal new information on the BN/KL outflow. The outstanding morphological feature of this region is the array of molecular hydrogen ``fingers'' emanating from the general vicinity of IRc2 and the presence of several Herbig-Haro objects. The NICMOS images appear to resolve individual shock fronts. This work is a more quantitative and detailed analysis of our data from a previous paper. Line strengths for the H21-0 S(4) plus 2-1 S(6) lines at 1.89 µm are estimated from measurements with the Paschen-α continuum filter F190N at 1.90 µm and continuum measurements at 1.66 and 2.15 µm. We compare the observed H2 line strengths and ratios of the 1.89 and 2.12 µm 1-0 S(1) lines with models for molecular cloud shock waves. Most of the data cannot be fit by J-shocks but are well matched by C-shocks with shock velocities in the range of 20-45 km/s and preshock densities of 104-106/cm3, similar to values obtained in larger beam studies which averaged over many shocks. There is also some evidence that shocks with higher densities have lower velocities.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - Infrared: ISM: Lines and Bands - ISM: Individual: Alphanumeric: OMC-1 - ISM: Jets and Outflows - Stars: Pre-Main-Sequence

Nomenclature: Table 1: [CSK2007] SSs-MSS N=13.

Simbad objects: 29

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