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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559189.0, MPI für Astronomie / Publikationen_mpia
Herschel-PACS imaging of protostars in the HH 1-2 outflow complex
Authors:Fischer, W. J.; Megeath, S. T.; Ali, B.; Tobin, J. J.; Osorio, M.; Allen, L. E.; Kryukova, E.; Stanke, T.; Stutz, A. M.; Bergin, E.; Calvet, N.; di Francesco, J.; Furlan, E.; Hartmann, L.; Henning, T.; Krause, O.; Manoj, P.; Maret, S.; Muzerolle, J.; Myers, P.; Neufeld, D.; Pontoppidan, K.; Poteet, C. A.; Watson, D. M.; Wilson, T.
Date of Publication (YYYY-MM-DD):2010
Journal Abbrev.:Astronomy and Astrophysics
Start Page:id.L122
Audience:Not Specified
Abstract / Description: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 Lȯ 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. 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 the Max-Planck-Institut für Radioastronomie, the European Southern Observatory, and the Onsala Space Observatory.Figures 2 and 3 are only available in electronic format at <A href="http://www.aanda.org">http://www.aanda.org</A>
Free Keywords:stars: formation; stars: protostars; circumstellar matter; infrared: ISM; infrared: stars
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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