Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan (ASIAA)
University of Denver
出版者
宇宙航空研究開発機構(JAXA)
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料
雑誌名(英)
JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
巻
JAXA-SP-17-009E
ページ
293 - 296
発行年
2018-03-09
会議概要（会議名, 開催地, 会期, 主催者等）
第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan
抄録（英）
As one of the follow-up studies of the Herschel Planetary Nebula Survey (HerPlaNS; Ueta et al. 2014), we focus on a Crich bipolar planetary nebula (PN) NGC6781 to characterize the dusty nebula and the central star based on our own Herschel data and the rich archival spectroscopic/photometric imaging data in wavelengths from UV to radio wavelength. With CLOUDY, we construct a comprehensive photoionization model of NGC6781 ever made incorporating data from UV to radio. We reproduce the observed spectral energy distribution (SED) and all the atomic gas, H2, CO, and OH molecular line fluxes. We estimate the total gas mass to be 0.41 solar mass by our CLOUDY modeling. A significant fraction of this total mass (about 70 %) is found to exist in the photodissociation region (PDR), demonstrating the critical importance of the PDR in PNe that are generally recognized as the hallmark of ionized/H+ regions. From our detailed multiwavelength analysis of NGC6781, we emphasise that characterizing PDRs and estimating warmcold gas/dust masses in any astronomical objects would be very important for fully understanding stellar evolution and material recycling in galaxies. Dataset provided by FarIR AKARI and Herschel have a critical role to investigate PDRs in PNe.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
The Herschel Planetary Nebula Survey (HerPlaNS): A Comprehensive Dusty Photoionization Model of NGC6781
AA1730026055.pdf
(650.37KB)
