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Direct Detection of Intermediate Mass Compact Objects via Submillilensing
Kaiki Taro Inoue, Masashi Chiba
A galaxy-sized halo may contain a large number of intermediate mass (10^{2-4} solar mass) compact objects (IMCOs), which can be intermediate mass black holes (IMBHs) or the CDM sub…
Impact of dark matter subhalos on extended HI disks of galaxies: Possible formation of HI fine structures and stars
Kenji Bekki, Masashi Chiba
Recent observations have discovered star formation activities in the extreme outer regions of disk galaxies. However it remains unclear what physical mechanisms are responsible for…
Dark and stellar matter in strong lensing galaxies from a joint lensing and stellar dynamics
Takashi Hamana, Youichi Ohyama, Masashi Chiba +1
We present Subaru spectroscopy of the early-type lensing galaxies in the lens systems HST14113+5211 (z=0.464) and B2045+265 (z=0.868), being aimed at measuring the velocity dispers…
Fossil records of cosmic reionization in galactic stellar halos
Kenji Bekki, Masashi Chiba
Galactic stellar halos have long been considered to contain fossil information on early dynamical and chemical evolution of galaxies. We propose that the surface brightness distrib…
Subaru Mid-infrared Imaging of the Quadruple Lenses PG1115+080 and B1422+231: Limits on Substructure Lensing
Masashi Chiba, Takeo Minezaki, Nobunari Kashikawa +2
We present mid-infrared imaging at 11.7 mu m for the quadruple lens systems, PG1115+080 and B1422+231, using the cooled mid-infrared camera and spectrometer (COMICS) attached on th…
Three-dimensional Mapping of CDM Substructure at Submillimeter Wavelengths
Kaiki Taro Inoue, Masashi Chiba
The cold dark matter (CDM) structure formation model predicts that about 5-10 percent of a typical galactic halo of mass $\sim 10^{12} \ms$ is in substructures with masses $\lesssi…