Flux-Velocity Relation for H2 Outflows

Details Flux-Velocity Relation for H2 Outflows Flux-Velocity Relation for H2 Outflows

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...572..227s&link_type=abstract

The Astrophysical Journal, Volume 572, Issue 1, pp. 227-231.

Astronomy and Astrophysics

Astronomy

11

Ism: Jets And Outflows, Ism: Kinematics And Dynamics, Ism: Molecules, Stars: Formation

Scientific paper

We present an analysis of velocity-resolved near-IR molecular hydrogen observations of a variety of protostellar outflows with very different energetics, degrees of collimation, and morphologies. Observations in the 2.12 μm line of H2 were obtained using an IR Fabry-Pérot interferometer with a spectral resolution of 23 km s-1. The integrated flux-velocity diagrams for each outflow show a flat spectrum for low velocities followed by a decreasing power law dF/dv~vγ, with γ between -1.8 and -2.6, for velocities higher than a clearly defined break velocity at 2-17 km s-1. Contrary to shock model predictions, it is shown that the H2 intensity is constant with velocity. We argue that the flux-velocity relation can then be interpreted as a mass-velocity relation, in striking similarity to the power-law mass spectra observed in CO outflows. By comparing H2 and CO mass-velocity spectra, it is shown that there is a velocity regime in which both molecules coexist and produce similar γ-values. Evolution effects in outflows appear as a correlation between outflow length and γ as outflows age, the spectra becomes steeper. Our results support a common physical origin for both CO and H2 emission and a strong association between the molecular outflows traced in each molecule. Based on observations obtained at the Observatorio Astronómico Nacional at San Pedro Mártir, Mexico.

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