こぎつね座IC4954/4955星雲領域の3世代にわたる星形成連鎖
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(29) 50 IC4954/4955 IRAS 100 mm #$%&' HI. !". !" (0ῌ30 km/s) #$%. &' ()*+,-./0%123 41 567 8)* (2MASS) 9:;<=>'?@ABC% &D -.% EFE IC 4954/4955 GH I %&JK' LM=NO PQ10 Myr R -STUV=W4 X YZ[\ IC4954/4955 S 2 UV= B&]^B. 4. ῌ ῏ ῎ ῍ _`a bcd1GHe )*9:;-.fgh231ijk flm%&iTn23j o23pMqr& sMt u %vwx;yz {|j4}4e~; f%&i GM ==(. S 102 . S 11 . AKARI Infrared Imaging of Reflection Nebulae IC4954 and IC4955 Daisuke ISHIHARA Division of Particle and Astrophysical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464ῌ8602, Japan Abstract : We present the observations of the reflection nebulae IC4954 and IC4955 region with the Infrared Camera and the Far-Infrared Surveyor (FIS) on board the infrared astronomical satellite AKARI during its performance verification phase. We obtained 7 band images from 7 to 160 mm with higher spatial resolution and higher sensitivities than previous observations. The spatial variation in the midinfrared color suggests that the star-formation in IC4954/4955 is progressing from south-west to north-east. The FIS 4-band data from 65 mm to 160 mm allow us to correctly estimate the total infrared luminosity from the region, which is about one sixth of the energy emitted from the existing stellar sources. Five candidates for young stellar objects have been detected as point sources for the first time in the 11 mm image and it is suggested that that current starformation has been triggered by previous starformation activities. A wide area map of the size of about 1 deg around the IC 4954/4955 region was created from the AKARI mid-infrared AllSky Survey data. Together with the HI 21 cm data, it suggests a large hollow structure of a degree scale, on whose edge the IC4954/4955 region has been created, indicating star formation over three generations in largely di#erent spatial scales.. 675.
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