Astrophys. J., 515, 696-705 (1999/April-3)
L1448 IRS 2: a HIRES-identified class 0 protostar.
O'LINGER J., WOLF-CHASE G., BARSONY M. and WARD-THOMPSON D.
Abstract (from CDS):
We present far-infrared and submillimeter images and millimeter-continuum photometry for L1448 IRS 2, a low-luminosity (5.2 L☉), embedded young stellar object discovered by IRAS. New far-infrared maps were produced from the archival IRAS data via high-resolution (HIRES) processing, the name given to the implementation of the maximum correlation method for image construction from the IRAS data streams. The HIRES-processed images of L1448 IRS 2 presented here have effective resolutions of ∼35''x28'', ∼35''x37'', and ∼45''x40'' at 25, 60, and 100 µm, respectively, which represent an order of magnitude improvement over previously available far-infrared maps. L1448 IRS 2 was mapped at 450 and 850 µm, and we acquired continuum photometry at 1.3 mm. With these new data, we plot the most complete spectral energy distribution for L1448 IRS 2 to date. We also present sensitive 12CO J=1⟶0 emission-line maps of a 47'x7' area of the L1448 dark cloud, centered on L1448 IRS 2, obtained with the on-the-fly imaging capability of the NRAO 12 m telescope. As a direct consequence of this mapping, we have discovered a parsec-scale molecular outflow associated with L1448 IRS 2. The combined continuum and molecular line data confirm the classification of L1448 IRS 2 as a new member of the rare, short-lived (a few x104 yr), Class 0 phase of protostellar evolution. The use of HIRES imaging of IRAS data as a promising tool for identifying protostellar candidates is demonstrated by the example of L1448 IRS 2.
Stars: Circumstellar Matter - Infrared: Stars - Stars: Imaging - Stars: Individual: Alphanumeric: L1448 IRS 2 - Stars: Pre-Main-Sequence
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