Free-free Radio Emission from Young Stellar Objects

Details Free-free Radio Emission from Young Stellar Objects Free-free Radio Emission from Young Stellar Objects

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...612l..69s&link_type=abstract

The Astrophysical Journal, Volume 612, Issue 1, pp. L69-L72.

Astronomy and Astrophysics

Astronomy

19

Ism: Herbig-Haro Objects, Ism: Jets And Outflows, Radiation Mechanisms: Thermal, Radio Continuum: Stars, Stars: Winds, Outflows

Scientific paper

We calculate the centimeter wavelength free-free emission of the jets of young stellar objects (YSOs) with the X-wind model enhanced by a variety of physical processes. Using parameters characteristic of a Class I YSO with a mass-loss rate of ~10-6 Msolar yr-1, we obtain a 3.6 cm map and a spectral index that compare well with high spatial resolution observations of L1551 IRS 5. Models with lower mass-loss rates, appropriate for Class II YSOs with revealed optical jets, produce radio jets that are too weak to be detected at current sensitivity levels. In addition to demonstrating the consistency of the density distribution of the X-wind model with observations, we are able to obtain information on the processes that heat and ionize the inner jet, i.e., X-ray ionization and shock heating and ionization.

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