AKARI observation of interstellar ice

2010 Fiscal Year Final Research Report

• Project/Area Number: 19740103
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Astronomy
• Research Institution: Kobe University
• Principal Investigator: AIKAWA Yuri 神戸大学, 理学研究科, 准教授 (40324909)
• Project Period (FY): 2007 – 2010
• Keywords: 星間物質 / 赤外線天文学

Research Abstract

We performed spectroscopic observation towards (1) edge-on YSOs and (2) field stars behind the molecular clouds at 2-5 micron with the resolution of δλ/λ~100. AKARI can observe ice bands which cannot be observed from the ground, such as 4micron CO_2 band. We have detected H_2O, CO_2 and CO ice absorptions. The CO_2/H_2O ratio is consistent with the previous studies which used CO2 band at longer wavelength. We also detected strong absorption which coincides with XCN band towards edge-on YSOs. It could be formed by photolysis via UV radiation from YSO. Towards the molecular cloud L1517A, we derived spectrum towards more than 10 field stars. We show that H_2O column density correlate well with extinction (Av).

Research Products

• [Journal Article] AKARI observations of ice absorption bands towards edge-on young stellar object (2012)
  • Author(s): Aikawa, Y., Kamuro, D., Sakon, I., Itoh, Y., Terada, H., Noble, J. A., Pontoppidan, K. M., Fraser, H. J., Tamura, M., Kandori, R., Kawamura, A., Ueno, M.
  • Journal Title: Astronomy & Astrophysic Volume: 538 Pages: 57-68
  • Peer Reviewed
• [Journal Article] Observation of interstellar and circumstellar ice (2009)
  • Author(s): Aikawa, Y., Noble, J. A., Sakon, I., Kamuro, D., Irimichi, N., Pontoppidan, K. M., Fraser, H., Tamura, M., Terada, H.; Ueno, M. and AFSAS Team
  • Journal Title: Astronomical Society of the Pacific, Cenference Serie Volume: 418 Pages: 47-54
• [Journal Article] Probing the Chemistry of Molecular Cores: 2.5-5□m AKARI Grism Spectroscopy of Young Stellar Objects in B35 (2009)
  • Author(s): Noble. J.A., Aikawa, Y., Fraser, H.J., Pontoppidan, K.M., & Sakon, I
  • Journal Title: Astronomical Society of the Pacific, Cenference Series Volume: 418 Pages: 411-414
• [Presentation] AKARI observations of ice absorption bands towards edge-on YSOs (poster) (2011)
  • Author(s): Aikawa, Y.
  • Organizer: IAU Symposium 280: The Molecular Universe
  • Place of Presentation: Toledo, Spain
  • Year and Date: 20110530-0603
• [Presentation] 星・惑星系形成過程におけるガス・氷組成 (2010)
  • Author(s): 相川祐理
  • Organizer: ALMA-Subaru Workshop 2010 (宇宙・銀河・星・惑星・生命の誕生)
  • Place of Presentation: 国立天文台(三鷹)
  • Year and Date: 20100929-30
• [Presentation] AKARI, a light to illuminate the misty Universe (2009)
  • Author(s): Aikawa, Y.
  • Organizer: Observation of interstellar and circumstellar ice(invited)
  • Place of Presentation: 東京大学
  • Year and Date: 20090216-19
• [Presentation] 『あかり』による原始惑星形成円盤の氷観測 (2008)
  • Author(s): 鹿室大, 相川祐理, 伊藤洋一, 寺田宏
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 国立オリンピック記念青少年総合センター
  • Year and Date: 20080324-27