Systematic study of the stellar initial mass function and its variation

2016 年度 実績報告書

• 研究課題/領域番号: 15K17600
• 研究機関: 東京大学
• 研究代表者: MORE Surhud 東京大学, カブリ数物連携宇宙研究機構, 特任助教 (00646044)
• 研究期間 (年度): 2015-04-01 – 2017-03-31
• キーワード: Stellar IMF constraints / HSC weak lensing

研究実績の概要

The main goals of the project was to pursue investigations of the initial mass function using combination of spectroscopic data as well as weak gravitational lensing from the Hyper Suprime Cam survey. The spectroscopic indices as indicated in the previous report have been thought to be unreliable and therefore more focus was given to the weak lensing aspects of this research project. Accordingly I am urrently working on the weak lensing results from the Hyper-Suprime Cam survey. I have developed the weak lensing pipeline to measure the weak lensing signals and to help test for systematics as proposed in the original plan. I have also helped the software team further test a new parameter important for quantifying the blendedness of galaxies (this would be important to measure weak lensing signals at small separation from the foreground lens galaxies).
The back up project to obtain constraints on the initial mass function using data from CFHTLens and CMASS galaxies was published in Jun 2015. This project was a pilot project to test how weak lensing signal from scales from HSC can be used to constrain the stellar masses of CMASS galaxies. The resulting constraints were already sensitive to rule out some measurement of stellar masses based on stellar population synthesis models. This project will now be attempted with the data from HSC.
As reported last year, the investigation of halo assembly bias and the splashback radius of galaxy clusters was one of the unexpected outcomes while exploring this project. I continued investigation on
this topic with separate research grant.

備考

All of the papers were posted online to the community peer review
website www.arxiv.org

研究成果

• [国際共同研究] Carnegie Melon University/Princeton University/Jet Propulsion Laboratory Caltech(米国)
  • 国名: 米国
  • 外国機関名: Carnegie Melon University/Princeton University/Jet Propulsion Laboratory Caltech
• [国際共同研究] Max Planck Institute for astrophysics(Germany)
  • 国名: ドイツ
  • 外国機関名: Max Planck Institute for astrophysics
• [雑誌論文] Testing gravity on large scales by combining weak lensing with galaxy clustering using CFHTLenS and BOSS CMASS (2017)
  • 著者名/発表者名: Alam, S., Miyatake, H., More, S., Ho, S. and Mandelbaum, R.
  • 雑誌名: MNRAS 巻: 465 ページ: 4853-4865
  • DOI: 10.1093/mnras/stw3056
  • 査読あり / 国際共著
• [雑誌論文] A new quadruple gravitational lens from the Hyper Suprime-Cam Survey: the puzzle of HSC J115252+004733 (2017)
  • 著者名/発表者名: More, A., More, S. (8th author in 19 authors) et.al
  • 雑誌名: MNRAS 巻: 465 ページ: 2411-2419
  • DOI: 10.1093/mnras/stw2924
  • 査読あり / 国際共著
• [雑誌論文] Interpreting the Strongly Lensed Supernova iPTF16geu: Time Delay Predictions, Microlensing, and Lensing Rates (2017)
  • 著者名/発表者名: More, A. , Suyu, S.H., Oguri, M., More, S., Lee, C.-H.
  • 雑誌名: ApJ 巻: 835 ページ: L25
  • DOI: 10.3847/2041-8213/835/2/L25
  • 査読あり / 国際共著
• [雑誌論文] Detection of the Splashback Radius and Halo Assembly Bias of Massive Galaxy Clusters (2016)
  • 著者名/発表者名: More, S., Miyatake, H., Takada, M., Diemer, B., Kravtsov, A.V., Dalal, N.K., More, A., Murata, R., Mandelbaum, R.,Rozo, E.,Rykoff, E.S., Oguri, M., and Spergel, D.N.
  • 雑誌名: ApJ 巻: 825 ページ: 39
  • DOI: 10.3847/0004-637X/825/1/39
  • 査読あり / 国際共著
• [雑誌論文] The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z {\tilde} 1.4 (2016)
  • 著者名/発表者名: Okumura, T., More, S. (9th author of 25th authors) et. al
  • 雑誌名: PASJ 巻: 68 ページ: 38
  • DOI: 10.1093/pasj/psw029
  • 査読あり / 国際共著
• [雑誌論文] Strong bimodality in the host halo mass of central galaxies from galaxy-galaxy lensing (2016)
  • 著者名/発表者名: Mandelbaum, R. , Wang, W., Zu, Y., White, S., Henriques, B. and More, S.
  • 雑誌名: MNRAS 巻: 457 ページ: 3200-3218
  • DOI: 10.1093/mnras/stw188
  • 査読あり / 国際共著
• [雑誌論文] Evolution of Stellar-to-Halo Mass Ratio at z = 0 - 7 Identified by Clustering Analysis with the Hubble Legacy Imaging and Early Subaru/Hyper Suprime-Cam Survey Data (2016)
  • 著者名/発表者名: Harikane}, Y., Ouchi, M., Ono, Y., More, S., Saito, S., Lin, Y.-T., Coupon, J., Shimasaku, K., Shibuya}, T., Price, P.A., Lin, L., Hsieh, B.-C., Ishigaki, M., Komiyama, Y., Silverman, J., Takata, T., Tamazawa, H. and Toshikawa, J.
  • 雑誌名: ApJ 巻: 821 ページ: 123
  • DOI: 10.3847/0004-637X/821/2/123
  • 査読あり / 国際共著
• [学会発表] Systematics in photometric redshifts: tests > using weak lensing (2017)
  • 著者名/発表者名: Surhud More
  • 学会等名: HSC Weak lensing internal workshop
  • 発表場所: Princeton University, Princeton (USA)
  • 年月日: 2017-02-08 – 2017-02-08
  • 国際学会
• [学会発表] Assembly bias and Splashback radius of Galaxy clusters (2016)
  • 著者名/発表者名: Surhud More
  • 学会等名: From theory to Lensing: Century of Gravitational lensing applications
  • 発表場所: Leiden University, Leiden (Netherlands)
  • 年月日: 2016-07-14 – 2016-07-14
  • 国際学会