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High-velocity interstellar bullets in IRAS 05506+2414 : a very young protostar

Show simple item record Sahai, Raghvendra Claussen, Mark Sánchez Contreras, Carmen Morris, Mark Sarkar, Geetanjali 2008-12-03T23:02:43Z 2008-12-03T23:02:43Z 2008-06-10
dc.identifier.citation The Astrophysical Journal, 680:483–494, 2008 June 10 DOI: 10.1086/587638 en_US
dc.identifier.clearanceno 08-0294
dc.description.abstract We have made a serendipitous discovery of an enigmatic outflow source, IRAS 05506+2414 (hereafter IRAS 05506), as part of a multiwavelength survey of pre-planetary nebulae (PPNs). The HST optical and near-infrared images show a bright compact central source with a jetlike extension, and a fanlike spray of high-velocity (with radial velocities up to 350 km s-1) elongated knots which appear to emanate from it. These structures are possibly analogous to the near-IR ``bullets'' seen in the Orion Nebula. Interferometric observations at 2.6 mm show the presence of a continuum source and a high-velocity CO outflow, which is aligned with the optical jet structure. IRAS 05506 is most likely not a PPN. We find extended NH3 (1,1) emission toward IRAS 05506; these data, together with the combined presence of far-IR emission, H2O and OH masers, and CO and CS J=2-1 emission, strongly argue for a dense, dusty star-forming core associated with IRAS 05506. IRAS 05506 is probably an intermediate-mass or massive protostar, and the very short timescale (200 yr) of its outflows indicates that it is very young. If IRAS 05506 is a massive star, then the lack of radio continuum and the late G to early K spectral type we find from our optical spectra imply that in this object we are witnessing the earliest stages of its life, while its temperature is still too low to provide sufficient UV flux for ionization. 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 radio lines en_US
dc.subject mass loss of stars en_US
dc.subject star formation en_US
dc.title High-velocity interstellar bullets in IRAS 05506+2414 : a very young protostar en_US
dc.type Article en_US

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