重力レンズ効果を用いた銀河群領域の暗黒物質分布の探求

2014 Fiscal Year Annual Research Report

• Project/Area Number: 12F02322
• Research Institution: The University of Tokyo
• Co-Investigator(Kenkyū-buntansha): MORE Anupreeta 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (10753759)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: useful for education / great public outreach / valuable for astronomers

Outline of Annual Research Achievements

We successfully conducted two lens searches in Space Warps (SW, spacewarps.org) in FY2013. I led the first SW lens search and analysed the results. I made comparisons between the performance of humans vs robots and we find a fairly large number of lens candidates which were missed by previous robotic searches. Our work is summarized and presented in Paper I- http://arxiv.org/abs/1504.06148 and Paper II - http://arxiv.org/abs/1504.05587 (to be submitted to MNRAS).
From the second lens search which was conducted live on BBC in FY2013, an intriguing lens candidate was discovered. We used several world class telescopes including Subaru (owned by Japan) to confirm that this truly a lens and studied the properties of the lensed galaxy such as the star-formation rate. I produced the lens mass model which calculates how magnified the lensed galaxy is in order to derive the true luminosity of the lensed galaxy and other such properties (http://arxiv.org/abs/1503.05824, MNRAS submitted).
We also enabled mass modelling of the lens candidates for the citizens (Kueng et al. 2015) and found that citizens produce fairly similar results compared to experts in this task. This is encouraging because assistance from citizens on mass modelling will become crucial as we embark upon the discovery of thousands of lens candidates.
The resources from SW have legacy value e.g. the simulated lens samples that we generate are useful for testing other lens finding algorithms as we did in Chan et al. (2014, http://arxiv.org/abs/1411.5398)

Research Progress Status

26年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

26年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Gravitational lens modelling in a citizen science context (2015)
  • Author(s): Rafael Kung, Prasenjit Saha, Anupreeta More, Elisabeth Baeten, Jonathan Coles, Claude Cornen, Christine Macmillan, Phil Marshall, Surhud More, Jonas Odermatt, Aprajita Verma, Julianne K. Wilcox
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 447 Pages: 2170-2180
  • DOI: 10.1093/mnras/stu2554
  • Peer Reviewed / Open Access
• [Journal Article] Detection of the Gravitational Lens Magnifying a Type Ia Supernova (2014)
  • Author(s): Robert M. Quimby, Masamune Oguri, Anupreeta More, Surhud More, Takashi J. Moriya, Marcus C. Werner, Masayuki Tanaka, Gaston Folatelli, Melina C. Bersten, Keiichi Maeda, Ken'ichi Nomoto
  • Journal Title: Science Volume: 344 Pages: 396-399
  • DOI: 10.1126/science.1250903
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Dark matter-baryons separation at the lowest mass scale: the Bullet Group (2014)
  • Author(s): F. Gastaldello, M. Limousin, G. Foex, R. P. Munoz, T. Verdugo, V. Motta, A. More, R. Cabanac, D. A. Buote, D. Eckert, S. Ettori, A. Fritz, S. Ghizzardi, P. J. Humphrey, M. Meneghetti, M. Rossetti
  • Journal Title: Monthly Notices of the Royal Astronomical Society Letters Volume: 442 Pages: L76-L80
  • DOI: 10.1093/mnrasl/slu058
  • Peer Reviewed / Open Access
• [Journal Article] Characterizing SL2S galaxy groups using the Einstein radius (2014)
  • Author(s): T. Verdugo, V. Motta, G. Foex, J. E. Forero-Romero, R. P. Munoz, R. Pello, M. Limousin, A. More, R. Cabanac, G. Soucail, J. P. Blakeslee, A. J. Mejia-Narvaez, G. Magris, J. G. Fernandez-Trincado
  • Journal Title: Astronomy & Astrophysics Volume: 571 Pages: -
  • DOI: 10.1051/0004-6361/201423696
  • Peer Reviewed / Open Access
• [Journal Article] Adaptive optics observations of the gravitationally lensed quasar SDSS J1405+0959 (2014)
  • Author(s): Cristian E. Rusu, Masamune Oguri, Yosuke Minowa, Masanori Iye, Anupreeta More, Naohisa Inada, Shin Oya
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 444 Pages: 2561-2570
  • DOI: 10.1093/mnras/stu1621
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Space Warps: crowd sourcing the discovery of lenses and SW-CFHTLS: First results (2014)
  • Author(s): Anupreeta More
  • Organizer: Perspectives of VLBI at extreme precision
  • Place of Presentation: Bonn, Germany
  • Year and Date: 2014-11-26 – 2014-11-26
  • Invited
• [Presentation] New lenses from Space Warps-CFHTLS (2014)
  • Author(s): Anupreeta More
  • Organizer: Galaxies and Cosmology in Light of Strong Lensing
  • Place of Presentation: Lecture Hall, Kavli IPMU, University of Tokyo, Chiba, Japan
  • Year and Date: 2014-11-21 – 2014-11-21