SIMBAD references

1995A&A...300..851D - Astronomy and Astrophysics, volume 300, 851-869 (1995/8-3)

Near-infrared imaging in H2 of molecular (CO) outflows from young stars.


Abstract (from CDS):

In an attempt to identify the molecular shocks associated with the acceleration of ambient gas by collimated outflows from young stars, we have imaged a number of known molecular (CO) outflows in H2 v=1-0 S(1) and wide-band K. H2 line emission is detected in all six sources: (o) In the L 1157, VLA 1623 and NGC 6334I outflows, bow-shaped H2 features are observed coincident with or just ahead of (downwind of) peaks in the CO outflow maps. (o) In NGC 2264G, as well as a compact group of H2 knots coincident with the blue-shifted CO peak, we see an extended H2 filament that traces the northern edge of the red-shifted CO flow. (o) In the L 1641N and Haro 4-255 molecular outflows we see a close correlation between H2 line emission features and peaks in the CO outflow maps. In each outflow system, the H2 probably results from shocks associated with the interaction of the flow with the ambient, molecular gas. A comparison of the H2 data with CO outflow maps strongly suggests that "prompt entrainment" near the head of a jet is the dominant mechanism for producing the CO outflows in at least some of these sources. We are also able to account for the ratios of observed radiated energy (derived from H2 v=1-0 S(1) flux measurements) to mechanical power in the CO outflows in at least half of the outflows with a very simple, strong, radiative shock model.

Abstract Copyright:

Journal keyword(s): shock waves - ISM: clouds - ISM: jets and outflows - ISM: molecules - infrared: interstellar: lines - infrared: stars

Nomenclature: Table 1, Fig. 1: [DE95] LDN 1157 N N=3, [DE95] LDN 1157 AN N=18. Table 2, Fig. 4: [DE95] VLA 1623 A N=5 Table 3, Fig. 6: [DE95] NGC 6334I N N=5, [DE95] NGC 6334I A N=4. Table 4, Fig. 8: [DE95] NGC 2264G N N=6, [DE95] NGC 2264G AN N=26. Table 5, Fig. 10: [DE95] LDN 1641N N N=3, [DE95] LDN 1641N AN N=13. Fig. 12: [DE95] HARO 4-255 A N=8

Errata: erratum in 1996A&A.305.694

CDS comments: NGC 2264G = [MLS88] G, VLA N = [GCT94] VLA N, NGC 6334I (I = roman digit) = MFSW I, NGC 6334F = RCM F

Simbad objects: 130

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