A5102707686- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Sperm and Testicular Function
- Hormonal and reproductive studies
- Prostate Cancer Treatment and Research
- Astrophysical Phenomena and Observations
- Urinary Bladder and Prostate Research
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Earthquake and Tsunami Effects
- Sexual Differentiation and Disorders
- Mechanical Engineering and Vibrations Research
- Planetary Science and Exploration
- Cardiac Structural Anomalies and Repair
- Bladder and Urothelial Cancer Treatments
- Testicular diseases and treatments
- Cardiac Fibrosis and Remodeling
- Pharmacy and Medical Practices
- Radiation Detection and Scintillator Technologies
Hosei University
2019-2024
Kobe University
2016-2019
Tohoku University
2009-2018
National Astronomical Observatory of Japan
2007-2016
High Energy Accelerator Research Organization
2014
Hitachi (Japan)
2014
Institute of Particle and Nuclear Studies
2014
The University of Tokyo
2007-2012
Kogakuin University
2008
We present the surface brightness profile of M31's stellar halo out to a projected radius 175 kpc. The estimates are based on confirmed samples M31 red giant branch stars derived from Keck/DEIMOS spectroscopic observations. A set empirical and photometric membership diagnostics is used identify reject foreground background contaminants. This enables us trace larger distances fainter brightnesses than previous studies. follows power-law with index -2.2 +/- 0.2 extends distance at least ~175...
We report the discovery of a new ultra-faint dwarf satellite companion Milky Way based on early survey data from Hyper Suprime-Cam Subaru Strategic Program. This satellite, Virgo I, which is located in constellation Virgo, has been identified as statistically significant (5.5 sigma) spatial overdensity star-like objects with well-defined main sequence and red giant branch their color-magnitude diagram. The significance this increases to 10.8 sigma when relevant isochrone filter adopted for...
Abstract We present the final results of our search for new Milky Way (MW) satellites using data from Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) survey over ∼1140 deg2. In addition to three candidates that we have already reported, identified two MW satellite in constellations Sextans, at a heliocentric distance D⊙ ≃ 126 kpc, and Virgo, 151 named Sextans II Virgo III, respectively. Their luminosities (Sext II: MV −3.9 mag; Vir III: −2.7 mag) half-light radii rh 154 pc; 44 pc)...
We present a photometric survey of the stellar halo nearest giant spiral galaxy, Andromeda (M31), using Suprime-Cam on Subaru Telescope.A detailed analysis V I color-magnitude diagrams resolved population is used to measure properties such as line-of-sight distance, surface brightness, metallicity, and age, these are isolate characterize different components M31 halo: (1) southern stream (GSS), (2) several other substructures, and(3) smooth halo.First, GSS characterized by broad red branch...
The halo of M31 shows a wealth substructures, some which are consistent with assembly from satellite accretion. Here we report on kinematic and abundance results Keck DEIMOS spectroscopy in the near-infrared calcium triplet region over 3500 red giant star candidates along minor axis off-axis spheroid fields M31. These data reach out to large radial distances about 160 kpc. derived velocity distributions show an indication kinematically cold substructure around ~17 kpc, has been reported...
We present the metallicity distribution of red giant branch (RGB) stars in M31's stellar halo, derived from photometric estimates for over 1500 spectroscopically confirmed RGB halo stars. The sample comes 38 fields observed with Keck/DEIMOS spectrograph, ranging 9 to 175 kpc projected distance center, and includes 52 M31 beyond 100 kpc. While a wide range metallicities is seen throughout metal-rich peak function becomes significantly less prominent increasing radius. profile shows continuous...
We report on the discovery of a new Milky Way (MW) satellite in Bo\"otes based data from on-going Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP). This satellite, named IV, is third ultra-faint dwarf that we have discovered HSC-SSP. identified statistically significant (32.3$\sigma$) overdensity stars having characteristics metal-poor, old stellar population. The distance to this system $D_{\odot}=209^{+20}_{-18}$ kpc with $V$-band absolute magnitude $M_V=-4.53^{+0.23}_{-0.21}$ mag....
Abstract We present the results from a search for new Milky Way (MW) satellites first two years of data Hyper Suprime-Cam (HSC) Subaru Strategic Program (SSP) ∼300 deg2 and report discovery highly compelling ultra-faint dwarf galaxy candidate in Cetus. This is second we have discovered after Virgo I reported our previous paper. satellite, Cetus III, has been identified as statistically significant (10.7 σ) spatial overdensity star-like objects, which are selected relevant isochrone filter...
Using the HST ACS, we have obtained deep optical images reaching well below oldest main-sequence turnoff in fields on southeast minor axis of Andromeda galaxy, 35 kpc from nucleus. These data probe star formation history extended halo Andromeda—that region beyond 30 that appears both chemically and morphologically distinct metal-rich, highly disturbed inner spheroid. The present data, together with our previous for at 11 21 kpc, do not show a simple trend toward older ages lower...
We present the velocity dispersion of red giant branch (RGB) stars in M31's halo, derived by modeling line sight distribution over 5000 50 fields spread throughout stellar halo. The dataset was obtained as part SPLASH (Spectroscopic and Photometric Landscape Andromeda's Stellar Halo) Survey, covers projected radii 9 to 175 kpc from center. All major structural components along both Milky Way (MW) M31 are incorporated a Gaussian Mixture Model, including all previously identified tidal debris...
The Andromeda galaxy (M31) shows many tidal features in its halo, including the Giant Southern Stream (GSS) and a sharp ledge surface density on western side (the W Shelf). Using DEIMOS Keck telescope, we obtain radial velocities of M31's giant stars along NW minor axis, range covering Shelf extending beyond edge. In space velocity versus radius, sample wedge pattern expected from shell, which is detected clearly here for first time. This confirms predictions an earlier model formation GSS,...
As part of our survey galactic stellar halos, we investigate the structure and populations northern outer halo in NGC 55, a member galaxy Sculptor Group, using deep wide-field V- I-band images taken with Subaru/Suprime-Cam. Based on analysis color–magnitude diagrams for red giant branch (RGB) stars, derive tip RGB based distance modulus to (m − M)0 = 26.58 ± 0.11(d 2.1 0.1 Mpc). From density maps, detect asymmetrically disturbed, thick disk two metal-poor overdense substructures north region...
Abstract We report on the global structure of Milky Way (MW) stellar halo up to its outer boundary based analysis blue horizontal-branch stars (BHBs). These tracers are extracted from (g, r, i, z)-band multi-photometry in internal data release ongoing Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) surveyed over a ∼550 deg2 area. In order select most likely BHBs by removing straggler (BSs) and other contamination statistically significant manner, we have developed applied an extensive...
Abstract We present wide and deep photometry of the northwestern part halo Andromeda galaxy (M31) using Hyper Suprime-Cam on Subaru Telescope. The survey covers a 9.2 deg 2 field in g , i NB 515 bands shows clear red giant branch (RGB) M31's stars pronounced clump (RC) feature. spatial distribution RC prominent stream feature, Northwestern (NW) Stream, diffuse substructure southern our field. estimate distances based method obtain <?CDATA $(m\mbox{--}M)$?> = 24.63 ± 0.191 (random) 0.057...
Abstract Cases Testicular adrenal rest tumor ( TART ) is one of the possible causes male infertility, accompanied by congenital hyperplasia CAH ). Here are reported two cases s that were referred to Kobe City Medical Center West Hospital for treatment infertility and testicular tumors. Outcome In case, semen analysis was improved from oligoasthenozoospermia normozoospermia after taking oral glucocorticoid supplementation. The other case original azoospermia showed sperm had ejaculated into...
We present the first results of Subaru/Hyper Suprime-Cam (HSC) survey interacting galaxy system, NGC4631 and NGC4656. From maps resolved stellar populations, we identify 11 dwarf galaxies (including already-known dwarfs) in outer region two tidal streams around NGC4631, named Stream SE NW, respectively. This paper describes fundamental properties these streams. Based on tip red giant branch method Bayesian statistics, find that StreamSE (7.10 Mpc Expected a posteriori, EAP, with 90% credible...
We present the structure of Milky Way stellar halo beyond Galactocentric distances $r = 50$ kpc traced by blue horizontal-branch (BHB) stars, which are extracted from survey data in Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). select BHB candidates based on $(g,r,i,z)$ photometry, where $z$-band is Paschen series and colors that involve sensitive to surface gravity. About 450 identified between 300 kpc, most reach previous large surveys including Sloan Digital Sky Survey. find...
Abstract We present the discovery of NGC253-SNFC-dw1, a new satellite galaxy in remote stellar halo Sculptor Group spiral, NGC 253. The system was revealed using deep, resolved star photometry obtained as part Subaru Near-Field Cosmology Survey that uses Hyper Suprime-Cam on Telescope. Although rather luminous ( M V = −11.7 ± 0.2) and massive * ∼ 1.25 × 10 7 ⊙ ), is one most diffuse satellites yet known, with half-light radius R h 3.37 0.36 kpc an average surface brightness ∼30.1 mag arcmin...
ABSTRACT We analyse the M31 halo and its substructure within a projected radius of 120 kpc using combination Subaru/HSC NB515 Canada France Hawaii Telescope/MegaCam g i bands. succeed in separating M31’s stars from foreground contamination with $\sim$90 per cent accuracy by surface gravity sensitive filter. Based on selected stars, we discover three new substructures, which associate Giant Southern Stream (GSS) based their photometric metallicity estimates. also produce distance estimates...
Abstract We report on serendipitous findings of 13 faint meteors and 44 artificial space objects by SuprimeCam imaging observations during 2004 August 11–16. The meteors, at about 100 km altitude, satellites/debris in orbit, 500 altitude or higher, were clearly discriminated their apparent defocused image sizes. defined a peak video-rate magnitude comparing the integrated photon counts from brightest portion track traversed within 33 ms to those 0-mag star same time duration. magnitudes thus...
Mirabegron is a selective beta3-adrenoceptor (β3 -AR) agonist, which commonly used for the treatment of overactive bladder. This medicine associated with atrophy reproductive organs in rats. However, no study has examined detailed action and mechanism its toxicity cells. In this study, we effect mirabegron on primary cultured rat Sertoli Firstly, RT-PCR immunocytochemistry revealed that β3 -AR was present Then, cells were treated mirabegron. Quantitative real-time PCR induced significant...
T. Sawano1, Tanimori1, H. Kubo1, A. Takada2, J. D. Parker1, Mizumoto1, S. Sonoda3, Y. Mizumura4, Tomono1, K. Nakamura1, Matsuoka1, Komura1, Sato1, Miuchi5, Kabuki6, Kishimoto7, Kurosawa8, Iwaki1, M. Tanaka9, Ikeno9, and Uchida9 1Department of Physics, Kyoto University, 606-8502, Japan 2Research Institute for Sustainable Humanosphere, 611-0011, 3Advanced Biomedical Engineering Research Unit, 606-8501, 4Unit Synergetic Studies Space, 5Department Kobe Hyogo 657-8501, 6Department Radiation...
We analyse the M31 halo and its substructure within a projected radius of 120 kpc using combination Subaru/HSC NB515 CFHT/MegaCam g- & i-bands. succeed in separating M31's stars from foreground contamination with $\sim$ 90 \% accuracy by surface gravity sensitive filter. Based on selected stars, we discover three new substructures, which associate Giant Southern Stream (GSS) based their photometric metallicity estimates. also produce distance estimates for known substructures. While these...
We analyze the outer regions of M33, beyond 15 kpc in projected distance from its center using Subaru/HSC multi-color imaging. identify Red Giant Branch (RGB) stars and Clump (RC) surface gravity sensitive $NB515$ filter for RGB sample, a selection both samples. construct radial density profile these RC stars, find that M33 has an extended stellar population with shallow power-law index $\alpha > -3$. This result represents flatter than halo which been detected by previous study focusing on...
We present the discovery of NGC253-SNFC-dw1, a new satellite galaxy in remote stellar halo Sculptor Group spiral, NGC 253. The system was revealed using deep resolved star photometry obtained as part Subaru Near-Field Cosmology Survey that uses Hyper Suprime-Cam on Telescope. Although rather luminous ($\rm{M_{V}} = -11.7 \pm 0.2$) and massive ($M_* \sim 1.25\times 10^7~\rm{M}_{\odot}$), is one most diffuse satellites yet known, with half-light radius $\rm{R_{h}} 3.37 0.36$ kpc an average...