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Quasar Mesolensing as a Probe of CDM Substructures

Published online by Cambridge University Press:  26 May 2016

Atsunori Yonehara ,
Masayuki Umemura  and
Hajime Susa
Atsunori Yonehara
Affiliation:
Center for Computational Physics, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki, 305-8577, Japan
Masayuki Umemura
Affiliation:
Center for Computational Physics, University of Tsukuba, Tennoudai 1-1-1, Tsukuba, Ibaraki, 305-8577, Japan
Hajime Susa
Affiliation:
Institute of Theoretical Physics, Rikkyo University, Nishi-Ikebukuro 3-34-1, Toshima-ku, Tokyo, 171-8501, Japan

Extract

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Currently, the CDM scenario has met a crisis that the number of substructures presented by cosmological N-body simulations based on the scenario is much larger than the observed amount. If such substructures do not really exist, it must be an actual crisis for the CDM scenario. in contrast, if the reason for the overproduction of substructures in simulations is some observational bias, and many substructures are invisible or not detectable due to very low star formation efficiency by some feedback processes (e.g., Nishi & Susa 1999), the CDM scenario will survive. Thus, it is crucial for the resolution of this crisis to discriminate between these two possibilities.

Type
Part 4: Lensing
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 141 - 142
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Nishi, R., & Susa, H. 1999, ApJ, 523, L103.Google Scholar
Yonehara, A., Umemura, M., & Susa, H. 2003, submitted to PASJ.Google Scholar