Spatially resolved submillimeter continuum emission toward L1551 IRS 5

Details Spatially resolved submillimeter continuum emission toward L1551 IRS 5 Spatially resolved submillimeter continuum emission toward L1551 IRS 5

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439..771l&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 439, no. 2, p. 771-778

Astronomy and Astrophysics

Astrophysics

23

Data Reduction, Early Stars, Pre-Main Sequence Stars, Spatial Resolution, Stellar Envelopes, Submillimeter Waves, Contours, Flux Density, Mathematical Models, Spectrum Analysis

Scientific paper

We present high signal-to-noise ratio 16-20 arcsec resolution submillimeter continuum images of the embedded young stellar object L1551 IRS 5. The images are dominated by a compact sources at the position of IRS 5, which has a deconvolved size of 10 +/- 3 arcsec. Low-level emission extends up to 5000 A.U. from IRS 5 and is distributed nonaxisymetrically. The 1100 micrometer emission is exended in the north-south direction and is elliptical in shape. In contrast, our 730 micrometer map shows emission in a cross-shaped pattern, with arms extending to the north, south, east, and west of IRS 5. The cross emission is not an artifact of our observational methods but rather is intrinsic to the source distribution. We model the submillimeter continuum emission at 1100 micrometers and 730 micrometers using three components: an unresolved point source; a cold (approximately 12 K), massive (approximately 1 solar mass), smoothly distributed envelope; and a warm (approximately equal to greater than 50 K), less massive (approximately equal to or less than 0.02 solar mass) 'cross' centered at the position of IRS 5. We note that the arms of the cross are well aligned with the edges of the CO outflow from IRS 5 and suggest that they may consist of core material warmed and pushed aside by the energetically dominant outflow.

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