L1448 IRS 2: A HIRES-identified Class 0 Protostar

Details L1448 IRS 2: A HIRES-identified Class 0 Protostar L1448 IRS 2: A HIRES-identified Class 0 Protostar

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...515..696o&link_type=abstract

The Astrophysical Journal, Volume 515, Issue 2, pp. 696-705.

Astronomy and Astrophysics

Astronomy

28

Stars: Circumstellar Matter, Infrared: Stars, Stars: Imaging, Stars: Individual: Alphanumeric: L1448 Irs 2, Stars: Pre-Main-Sequence

Scientific paper

We present far-infrared and submillimeter images and millimeter-continuum photometry for L1448 IRS 2, a low-luminosity (5.2 L_solar), 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 mum, respectively, which represent an order of magnitude improvement over previously available far-infrared maps. L1448 IRS 2 was mapped at 450 and 850 mum, 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 x10^4 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.

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