Shock heated dust in L1551: L(IR) greater than 20 solar luminosities

Astronomy and Astrophysics – Astronomy

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Dust, Infrared Astronomy, Luminosity, Morphology, Shock Heating, Bolometers, Emission Spectra, Infrared Astronomy Satellite, Ultraviolet Radiation

Scientific paper

The infrared bolometric luminosity of the extended emission from the L1551 flow exceeds 20 solar luminosities. Ultraviolet radiation from the shock associated with the flow appears to heat the dust requiring shock temperatures from 10,000 to 90,000 K in L1551, velocities of approximately 50 km/s near the end of the flow, and a minimum mechanical luminosity of approximately 40 solar luminosities. The total energy requirement of the infrared emission over a 10,000 year lifetime is 10 to the 46th to 47th ergs, two orders of magnitude higher than previous estimates for L1551. Infrared radiation offers a method of probing interstellar shocks, by sampling the untraviolet halo surrounding the shock. At least one current model for bipolar flows is capable of meeting the energetic requirements.

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