Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-10-08
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
18 pages, 9 figures, accepted for publication in PASJ
Scientific paper
We present the AKARI mid-infrared diffuse map of an area of about 4 deg x 3 deg near the Galactic center in the 9 um band. The band intensity is mostly attributed to the aromatic hydrocarbon infrared emissions of carbonaceous grains at wavelengths of 6.2, 7,7, 8.6, and 11.3 um. We detect the 9 um emission structures extending from the Galactic plane up to the latitude of about 2.5 deg, which have spatial correspondence to the molecular loops revealed by the NANTEN 12CO (J=1-0) observations. We find that the surface brightness at 9 um is suppressed near the foot points of the CO loops. The ratios of the 9 um to the IRAS 100 um brightness show significant depression near such bright regions in the CO emission. With the AKARI near-IR 2.5--5 um spectroscopy, we find that the 3.3 um aromatic hydrocarbon emission is absent in the region associated with the loop. These suggest the processing and destruction of carbonaceous grains in the CO molecular loops.
Fukui Yasuo
Ishihara Daisuke
Kaneda Hidehiro
Kawamura Akiko
Kondo Toru
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