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103 papers · 1 filter
Diversity of dark matter density profiles in the Galactic dwarf spheroidal satellites
Kohei Hayashi, Masashi Chiba, Tomoaki Ishiyama
The core-cusp problem is one of the controversial issues in the standard paradigm of cold dark matter (CDM) theory. However, under the assumption of conventional spherical s…
EMPRESS. II. Highly Fe-Enriched Metal-poor Galaxies with (Fe/O) and (O/H) : Possible Traces of Super Massive () Stars in Early Galaxies
Takashi Kojima, Masami Ouchi, Michael Rauch +18
We present element abundance ratios and ionizing radiation of local young low-mass (~ M_sun) extremely metal poor galaxies (EMPGs) with a 2% solar oxygen abundance (O/H)_su…
The Mean Absorption Line Spectra of a Selection of Luminous z~6 Lyman Break Galaxies
Yuichi Harikane, Nicolas Laporte, Richard S. Ellis +1
We examine the absorption line spectra of a sample of 31 luminous (M_UV=-23) Lyman break galaxies at redshift z~6 using data taken with the FOCAS and OSIRIS spectrographs on the Su…
EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal Poor Galaxies (EMPGs): Are EMPGs Local Analogs of High- Young Galaxies?
Yuki Isobe, Masami Ouchi, Takashi Kojima +16
We present the morphology and stellar population of 27 extremely metal poor galaxies (EMPGs) at with metallicities of 0.01--0.1 Z. We conduct multi-component sur…
N-body self-consistent stars-halo modeling of the Fornax dwarf galaxy
Galina Shchelkanova, Kohei Hayashi, Sergei Blinnikov
We present nearly self-consistent stellar-halo models of the Fornax dwarf spheroidal galaxy associated with the Milky Way galaxy. Such galaxies are dominated by dark matter and hav…
Testing an indirect method for identifying galaxies with high levels of Lyman continuum leakage
Satoshi Yamanaka, Akio K. Inoue, Toru Yamada +6
Using a sample of galaxies at with detected Lyman Continuum (LyC) leakage in the SSA22 field, we attempt to verify a proposed indirect method for identifying cases wit…