NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
New Infrared Emission Features and Spectral Variations in Ngc 7023We observed the reflection nebula NGC 7023, with the Short-High module and the long-slit Short-Low and Long-Low modules of the Infrared Spectrograph on the Spitzer Space Telescope. We also present Infrared Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS) images of NGC 7023 at 3.6, 4.5, 8.0, and 24 m. We observe the aromatic emission features (AEFs) at 6.2, 7.7, 8.6, 11.3, and 12.7 m, plus a wealth of weaker features. We find new unidentified interstellar emission features at 6.7, 10.1, 15.8, 17.4, and 19.0 m. Possible identifications include aromatic hydrocarbons or nanoparticles of unknown mineralogy. We see variations in relative feature strengths, central wavelengths, and feature widths, in the AEFs and weaker emission features, depending on both distance from the star and nebular position (southeast vs. northwest).
Document ID
20080032393
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Werner, M. W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Uchida, K. I.
(Cornell Univ. Ithaca, NY, United States)
Sellgren, K.
(Ohio State Univ. Columbus, OH, United States)
Marengo, M.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Gordon, K. D.
(Arizona Univ. Tucson, AZ, United States)
Morris, P. W.
(California Inst. of Tech. Pasadena, CA, United States)
Houck, J. R.
(Cornell Univ. Ithaca, NY, United States)
Stansberry, J. A.
(Arizona Univ. Tucson, AZ, United States)
Date Acquired
August 24, 2013
Publication Date
September 1, 2004
Publication Information
Publication: The Astrophysical Journal Supplement Series
Volume: 154
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NASA 1257184
CONTRACT_GRANT: NASA 1407
Distribution Limits
Public
Copyright
Other
Keywords
molecules
diffuse interstellar medium (ISM)
dust, extinction
reflection nebulae
lines and bands

Available Downloads

There are no available downloads for this record.
No Preview Available