Fischer, W. J. and Ali, B. and Pontoppidan, K. (2010) Herschel-PACS imaging of protostars in the HH 1–2 outflow complex. Astronomy and Astrophysics, 518 . Art. No. L122. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20101202-091102283
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We present 70 and 160 μm Herschel science demonstration images of a field in the Orion A molecular cloud that contains the prototypical Herbig-Haro objects HH 1 and 2, obtained with the Photodetector Array Camera and Spectrometer (PACS). These observations demonstrate Herschel’s unprecedented ability to study the rich population of protostars in the Orion molecular clouds at the wavelengths where they emit most of their luminosity. The four protostars previously identified by Spitzer 3.6–40 μm imaging and spectroscopy are detected in the 70 μm band, and three are clearly detected at 160 μm. We measure photometry of the protostars in the PACS bands and assemble their spectral energy distributions (SEDs) from 1 to 870 μm with these data, Spitzer spectra and photometry, 2MASS data, and APEX sub-mm data. The SEDs are fit to models generated with radiative transfer codes. From these fits we can constrain the fundamental properties of the protostars. We find luminosities in the range 12–84 L_⊙ and envelope densities spanning over two orders of magnitude. This implies that the four protostars have a wide range of envelope infall rates and evolutionary states: two have dense, infalling envelopes, while the other two have only residual envelopes. We also show the highly irregular and filamentary structure of the cold dust and gas surrounding the protostars as traced at 160 μm.
|Additional Information:||© 2010 ESO. Received 31 March 2010, Accepted 11 May 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. This work includes data acquired with the Atacama Pathfinder Experiment (APEX; E-082.F-9807, E- 284.C-5015). APEX is a collaboration between theMax-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory. Figures 2 and 3 are only available in electronic format at http://www.aanda.org. This work is based on observations made with the Herschel Space Observatory, a European Space Agency Cornerstone Mission with significant participation by NASA, and with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for the Herschel and Spitzer analysis was provided by NASA through awards issued by JPL/Caltech. We are grateful to Barbara Whitney and her collaborators for making their radiative transfer code available to the community.|
|Subject Keywords:||stars: formation, stars: protostars, circumstellar matter, infrared: ISM, infrared: stars|
|Official Citation:||Herschel-PACS imaging of protostars in the HH 1–2 outflow complex W. J. Fischer, S. T. Megeath, B. Ali, J. J. Tobin, M. Osorio, L. E. Allen, E. Kryukova, T. Stanke, A. M. Stutz, E. Bergin, N. Calvet, J. Di Francesco, E. Furlan, L. Hartmann, T. Henning, O. Krause, P. Manoj, S. Maret, J. Muzerolle, P. Myers, D. Neufeld, K. Pontoppidan, C. A. Poteet, D. M. Watson and T. Wilson A&A 518 L122 (2010) DOI: 10.1051/0004-6361/201014636|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||02 Dec 2010 19:24|
|Last Modified:||26 Dec 2012 12:42|
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