Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...668..918b&link_type=abstract
The Astrophysical Journal, Volume 668, Issue 2, pp. 918-923.
Astronomy and Astrophysics
Astronomy
5
Infrared: Galaxies, Galaxies: Individual: Ngc Number: Ngc 891
Scientific paper
In this paper we report on the detection of mid-infrared radiation extending to 5 kpc from the midplane of the nearby, edge-on galaxy NGC 891. The observations cover the range from 2 to 20 kpc above the galaxy midplane on both sides of the disk. The detection is made with the 16 and 22 μm peak-up imaging modes of the Infrared Spectrograph aboard the Spitzer Space Telescope. The measured surface brightness profiles at these two wavelengths are the same, within the uncertainties of about 30%. The surface brightness at 22 μm decreases exponentially with distance from the galaxy with a scale height of 1.3+/-0.3 kpc. The size of the inferred thick disk is therefore in agreement with findings at visible wavelengths. The 16 μm:22 μm brightness ratio is consistent with the mid-infrared spectral energy distribution of asymptotic giant branch stars, whose density was recently found to follow a similar spatial distribution. Diffuse interstellar dust, however, emits most of the observed mid-infrared radiation.
Ashby Matthew L. N.
Burgdorf Martin
Williams Richard
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