Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.5003g&link_type=abstract
American Astronomical Society, 189th AAS Meeting, #50.03; Bulletin of the American Astronomical Society, Vol. 28, p.1340
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We present near-infrared images of Cep A East exhibiting two diffuse emission features: a reflection nebula and (presumably shock excited) line emission. We have generated color maps of Cep A East using broadband images taken at 4.67 mu m, 3.81 mu m, and 2.158 mu m showing the gradient of extinction across the reflection nebula. High degrees of polarization observed at 2.2 mu m (Casement & McLean, ApJ, 462 , 797, 1996) and 3.6 mu m (Lenzen et al, A & A, 137 , 202, 1984) imply scattered starlight; at longer wavelengths, the emission could possibly have a thermal component. Investigation of various point sources which become more apparent at longer wavelengths prompts us to consider whether they and/or the compact sources in HW2 and HW3 are the exciting sources. We also present our current interpretations of near-infrared spectroscopic imaging (R = 800) of Cep A East in the molecular hydrogen, v: 1--0 S(1), 2.122 mu m line and the forbidden ionized iron 1.644 mu m line. Two distinct regions of presumably shocked excited line emission are observed in both lines: a southern `interstellar bullet' (Burton & Allen, Nature, 363, 54) consisting of an iron knot followed by a molecular hydrogen tail, and a northern region of more diffuse emission. All observations were carried out at the Wyoming Infrared Observatory 2.3 m telescope with the University of Rochester 3rd Generation Infrared Camera. The spectroscopic imaging was accomplished in conjunction with the Naval Research Laboratory and National Air and Space Museum Fabry-Perot Interferometer.
Fischer Jan
Forrest William John
Goetz Jennifer A.
Greenhouse Matthew A.
Hughes V. A.
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