Spitzer observations of the HH 1/2 system. The discovery of the counterjet
- Creators
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Noriega-Crespo, A.
- Raga, A. C.
Abstract
We present unpublished Spitzer IRAC observations of the HH 1/2 young stellar outow processed with a high angular resolution deconvolution algorithm, that produces sub-arcsecond (~ 0.6 - 0.8") images. In the resulting mid-infrared images, the optically invisible counterjet is detected for the first time. The counterjet is approximately half as bright as the jet at 4.5 µm (the IRAC band that best traces young stellar outows) and has a length of ~ 10". The NW optical jet itself can be followed back in the mid-IR to the position of the exciting VLA 1 source. An analysis of the IRAC colors indicates that the jet/counterjet emission is dominated by collisionally excited H_2 pure rotational lines arising from a medium with a neutral Hydrogen gas density of ~ 1000-2000 cm^(-3) and a temperature ~ 1500 K. The observed jet/counterjet brightness asymmetry is consistent with an intrinsically symmetric outow with extinction from a dense, circumstellar structure of ~ 6" size (along the outow axis), and with a mean visual extinction, A_V ~ 11 mag.
Additional Information
We thank Frank Masci for the development of AWAIC HiRes software and making it available to us. We also thank Dr. Sean Carey for useful conversations, and the anonymous referee for her/his careful reading of the manuscript. This work is based in part on observations made with the Spitzer Space Telescope which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407. And also based on observations made with the NASA/ESA Hubble Space Telescope, and obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (STECF/ ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA). The work of AR was supported by the CONACyT grants 61547, 101356 and 101975.Attached Files
Submitted - 1203.1032v1.pdf
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Additional details
- Eprint ID
- 29760
- Resolver ID
- CaltechAUTHORS:20120319-075141316
- 1407
- NASA
- 61547
- CONACyT
- 101356
- CONACyT
- 101975
- CONACyT
- Created
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2012-05-14Created from EPrint's datestamp field
- Updated
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2020-03-09Created from EPrint's last_modified field