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A new look at stellar outflows : Spitzer Observations of the HH 46/47 system

Show simple item record Noriega-Crespo, Alberto Morris, Patrick Marleau, Francine R. Carey, Sean Boogert, Adwin van Dishoeck, Ewine Evans, Neal J. II. Keene, Jocelyn Muzerolle, James Stapelfeldt, Karl Pontoppidan, Klaus Lowrance, Patrick Allen, Lori Bourke, Tyler L. 2008-05-29T22:35:52Z 2008-05-29T22:35:52Z 2004-09
dc.identifier.citation The Astrophysical Journal Supplement Series, 154:352–358, 2004 September, en_US
dc.description.abstract We present the Early Release Observations of the HH 46/47 system and HH 46 IRS 1 source, taken with the three instruments aboard the Spitzer Space Telescope. The optically invisible southwest lobe, driven by the HH 47C bow shock, is revealed in full detail by the Infrared Array Camera (IRAC) images and displays a “loop”-like morphology. Both of the mid-infrared outflow lobes are narrower than those of CO flow. We believe that the combination of emission by H2 rotational lines [S(11)-S(4)] and some atomic lines, which fall within the IRAC passbands, are responsible for the bulk of the observed emission, although contributions from the 3.3, 6.2, and 7.7 μm polycyclic aromatic hydrocarbon emission bands cannot be ruled out. Weak spectral features corresponding to these emitters are present in the Infrared Spectrograph spectrum of the HH 47A bow shock. The spectrum of HH 46 IRS 1 shows remarkable similarities to those of high-mass protostars, which include the presence of H2O, CO2, CH4, and possibly NH3, CH3OH, and ices. The high ice abundances and the lack of signs of thermal processing indicate that these ices in the envelope are well shielded from the powerful outflow and its cavity. Emission from the Bok globule at 24 μm is detected and displays a similar structure to that observed at 8 μm. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher The American Astronomical Society en_US
dc.subject infrared en_US
dc.subject Herbig-Haro objects en_US
dc.subject jets and outflows en_US
dc.subject stars : formation en_US
dc.subject Spitzer Space Telescope
dc.title A new look at stellar outflows : Spitzer Observations of the HH 46/47 system en_US
dc.type Article en_US

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