Physics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..20b&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Physics
Galaxies: Ism, Galaxies: Individual (Ngc~891, Ngc~5907), Infrared: Galaxies, Infrared: Ism
Scientific paper
In this contribution we report on the detection of mid-infrared radiation extending to several~kpc from the mid-planes of the nearby, edge-on galaxies NGC~891 and NGC~5907. The observations cover the range from 2 to more than 10~kpc on both sides of the disks. The detections were made with the peak-up imaging mode of the Infrared Spectrograph aboard Spitzer and the Infrared Camera (IRC) of AKARI. The surface brightness at 22~microns decreases exponentially with distance from the galaxies with scale heights of 1.3~±~0.3~kpc (NGC~891) or 1.1~±~0.3~kpc (NGC~5907). For NGC~891 we found the measured surface brightness profiles at 16 and 22~microns to be the same within the uncertainties of about 30%. radiation is emitted by diffuse interstellar dust. Both NGC~891 and NGC~5907 were mapped with Spitzer in a similar way, viz using one-dimensional rasters. NGC~5907 was also observed with the IRC. As the field of view of this instrument amounts to 10.3 arcmin × 10.2 arcmin, single pointings were here sufficient to obtain an image of the whole galaxy. We show that the extended emission, which was measured with Spitzer at only one position, is surrounding the whole galaxy, and that NGC~5907 appears at 24~μm largely undisturbed by its recently discovered neighbors.
Ashby Matthew L. N.
Burgdorf Martin
Gilmore Gerard F.
Pang Shujie
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