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2023-01-16T04:12:46Z
336:695:696
Mid- and far-infrared properties of Spitzer Galactic bubbles revealed by the AKARI all-sky surveys
Hattori, Yasuki
Kaneda, Hidehiro
Ishihara, Daisuke
Fukui, Yasuo
Torii, Kazufumi
Hanaoka, Misaki
Kokusho, Takuma
Kondo, Akino
Shichi, Kazuyuki
Ukai, Sota
Yamagishi, Mitsuyoshi
Yamaguchi, Yuta
open access
This is a pre-copyedited, author-produced version of an article accepted for publication in [Publications of the Astronomical Society of Japan] following peer review. The version of record [Publications of the Astronomical Society of Japan. v.68, n.3, 2016, p.37] is available online at: http://doi.org/10.1093/pasj/psw028.
infrared: ISM
ISM: bubbles
stars: formation
stars: massive
We have carried out a statistical study on the mid- and far-infrared (IR) properties of Galactic IR bubbles observed by Spitzer. Using the Spitzer 8 μm images, we estimated the radii and covering fractions of their shells, and categorized them into closed, broken, and unclassified bubbles with our data analysis method. Then, using the AKARI all-sky images at wavelengths of 9, 18, 65, 90, 140, and 160 μm, we obtained the spatial distributions and the luminosities of polycyclic aromatic hydrocarbon (PAH), warm, and cold dust components by decomposing six-band spectral energy distributions with model fitting. As a result, 180 sample bubbles show a wide range of total IR luminosities corresponding to the bolometric luminosities of a single B-type star to many O-type stars. For all the bubbles, we investigated relationships between the radius, luminosities, and luminosity ratios, and found that there are overall similarities in the IR properties among the bubbles regardless of their morphological types. In particular, they follow a power-law relation with an index of ∼3 between the total IR luminosity and radius, as expected from the conventional picture of the Strömgren sphere. The exceptions are large broken bubbles; they indicate higher total IR luminosities, lower fractional luminosities of the PAH emission, and dust heating sources located nearer to the shells. We discuss the implications of those differences for a massive star-formation scenario.
Oxford University Press
2016-06
eng
journal article
AM
http://hdl.handle.net/2237/25268
https://nagoya.repo.nii.ac.jp/records/23078
https://doi.org/10.1093/pasj/psw028
0004-6264
Publications of the Astronomical Society of Japan
68
3
37
37
https://nagoya.repo.nii.ac.jp/record/23078/files/hattori2016.pdf
application/pdf
11.0 MB
2017-06-01