Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560646d&link_type=abstract
American Astronomical Society, AAS Meeting #215, #606.46; Bulletin of the American Astronomical Society, Vol. 36, p.1137
Astronomy and Astrophysics
Astronomy
Scientific paper
“Green fuzzies” or “extended green objects” (EGOs) were discovered in the recent Spitzer GLIMPSE survey data. These extended emission sources appear to be brightest in the 4.5 micron IRAC channel images (which are generally assigned to be green when making 3-color RGB images from Spitzer data). Green fuzzies are frequently found in the vicinities of massive young stellar objects, and it has been established that they are in some cases associated with outflows. Nevertheless, the origin of this enhanced emission is still uncertain. It has been suggested that Br alpha, molecular hydrogen, [Fe II], and broad CO emission may be contributing to and enhancing the 4.5 micron flux from these objects. Although models have been proposed to estimate how much each of the above spectroscopic features may contribute to the overall emission in this channel, to date there have been direct observations of the 4.5 micron spectra of these objects.
We report here on the first direct spectroscopic detection of the origin of the green fuzzy emission. We present spatially resolved L and M band spectra, obtained with NIRI on the Gemini North telescope, of the individual knots of green fuzzy emission around the source G19.88-0.53. Our data reveal that the knots exhibit a pure molecular hydrogen line emission spectrum, with the 4.69 micron v=0-0 S(9) line dominating the emission, and no continuum component. Therefore, in this source, the green fuzzy nature is due solely to strong emission lines of molecular hydrogen within the passband of the IRAC 4.5 micron channel.
de Buizer James M.
Vacca William D.
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