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Extended near-infrared emission from visual reflection nebulae
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1983
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Extended near‑infrared (2–5 µm) emission was detected from the visual reflection nebulae NGC 7023, 2023, and 2068. The study explores whether the emission arises from thermal radiation by grains with unusually low infrared‑to‑ultraviolet emissivity ratios or from non‑equilibrium heating, or alternatively from continuum fluorescence. The spectra show a smooth 1000 K greybody continuum with 3.3 and 3.4 µm features, and this emission cannot be accounted for by free‑free, reflected light, field stars, or standard grain thermal emission. Published in The Astrophysical Journal (1983, DOI 10.1086/184083).
view Abstract Citations (216) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Extended near-infrared emission from visual reflection nebulae. Sellgren, K. ; Werner, M. W. ; Dinerstein, H. L. Abstract Extended near infrared (2 to 5 microns) emission was observed from three visual reflection nebulae, NGC 7023, 2023, and 2068. The emission from each nebula consists of a smooth continuum, which can be described by a greybody with a color temperature of 1000 K, and emission features at 3.3 and 3.4 microns. The continuum emission cannot be explained by free-free emission, reflected light, or field stars, or by thermal emission from grains, with commonly accepted ratios of infrared to ultraviolet emissivities, which are in equilibrium with the stellar radiation field. A possible explanation is thermal emission from grains with extremely low ratios of infrared to ultraviolet emissivities, or from grains with a temperature determined by mechanisms other than equilibrium radiative heating. Another possibility is continuum fluorescence. Previously announced in STAR N83-25629 Publication: The Astrophysical Journal Pub Date: August 1983 DOI: 10.1086/184083 Bibcode: 1983ApJ...271L..13S Keywords: Continuous Spectra; Emission Spectra; Near Infrared Radiation; Nebulae; Color; Infrared Telescopes; Spectrophotometry; Astrophysics full text sources ADS | data products SIMBAD (6)