TY - JOUR
T1 - An AKARI infrared study of dust emission in Galactic bubbles indicative of large-scale cloud-cloud collisions
AU - Hattori, Y.
AU - Kaneda, H.
AU - Ishihara, D.
AU - Yamagishi, M.
AU - Kondo, T.
AU - Sano, H.
N1 - Funding Information:
This research is based on observations with AKARI, a JAXA project with the participation of ESA. The authors thank all the members of the AKARI project, particularly the all-sky survey data reduction team. This research was supported by JSPS KAKENHI Grant Number 25247020 .
Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2015/10
Y1 - 2015/10
N2 - We report our systematic study on dust emission in massive star-forming regions indicative of large-scale cloud-cloud collisions, using the AKARI infrared (IR) all-sky survey data at wavelengths of 9, 18, 65, 90, 140, and 160μm. We focus on the Galactic bubbles catalogued by Spitzer, which are categorized into two types of morphology, closed and broken bubbles. A broken bubble has a possibility of being created by a cloud-cloud collision, judging from its morphological similarity to the structure theoretically predicted as a product of the collision. Therefore we search for systematic differences in IR properties between the two types. We performed aperture photometry for 111 Spitzer bubbles and created the spectral energy distribution (SED) of each bubble. We decomposed the SED into polycyclic aromatic hydrocarbon (PAH), warm and cold dust components by model fitting, and calculated their luminosities, LPAH, Lwarm and Lcold respectively, by integrating each SED component as a function of the wavelength. We then investigated the total IR luminosity (LTIR=LPAH+Lwarm+Lcold), the ratio of LPAH to LTIR and the ratio of Lwarm to LTIR as a function of the bubble radius. As a result, we find systematic differences between the closed and broken bubbles for the former two relations. We discuss the implications of the differences for the scenario of the large-scale cloud-cloud collisions.
AB - We report our systematic study on dust emission in massive star-forming regions indicative of large-scale cloud-cloud collisions, using the AKARI infrared (IR) all-sky survey data at wavelengths of 9, 18, 65, 90, 140, and 160μm. We focus on the Galactic bubbles catalogued by Spitzer, which are categorized into two types of morphology, closed and broken bubbles. A broken bubble has a possibility of being created by a cloud-cloud collision, judging from its morphological similarity to the structure theoretically predicted as a product of the collision. Therefore we search for systematic differences in IR properties between the two types. We performed aperture photometry for 111 Spitzer bubbles and created the spectral energy distribution (SED) of each bubble. We decomposed the SED into polycyclic aromatic hydrocarbon (PAH), warm and cold dust components by model fitting, and calculated their luminosities, LPAH, Lwarm and Lcold respectively, by integrating each SED component as a function of the wavelength. We then investigated the total IR luminosity (LTIR=LPAH+Lwarm+Lcold), the ratio of LPAH to LTIR and the ratio of Lwarm to LTIR as a function of the bubble radius. As a result, we find systematic differences between the closed and broken bubbles for the former two relations. We discuss the implications of the differences for the scenario of the large-scale cloud-cloud collisions.
KW - Galactic bubbles
KW - Infrared
KW - Interstellar dust
KW - Massive stars
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U2 - 10.1016/j.pss.2015.04.006
DO - 10.1016/j.pss.2015.04.006
M3 - Article
AN - SCOPUS:84944166263
VL - 116
SP - 57
EP - 63
JO - Planetary and Space Science
JF - Planetary and Space Science
SN - 0032-0633
ER -