A5068061393- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Real-time simulation and control systems
- Radio Astronomy Observations and Technology
- Molecular spectroscopy and chirality
- CCD and CMOS Imaging Sensors
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Quantum chaos and dynamical systems
- Scientific Research and Discoveries
- Protein Structure and Dynamics
- Transport Systems and Technology
- Gamma-ray bursts and supernovae
- Rheology and Fluid Dynamics Studies
- Distributed and Parallel Computing Systems
Seikei University
2023
National Astronomical Observatory of Japan
2006-2020
Hitotsubashi University
2020
Subaru (Japan)
2020
The Graduate University for Advanced Studies, SOKENDAI
2008
Japan Women's University
2005
In this paper, we describe the optical imaging data processing pipeline developed for Subaru Telescope's Hyper Suprime-Cam (HSC) instrument. The HSC Pipeline builds on prototype being by Large Synoptic Survey Data Management system, adding customizations HSC, large-scale capabilities, and novel algorithms that have since been reincorporated into LSST codebase. While designed primarily to reduce Strategic Program (SSP) data, it is also recommended reducing general-observer data. includes high...
Abstract The Hyper Suprime-Cam (HSC) is an 870 megapixel prime focus optical imaging camera for the 8.2 m Subaru telescope. wide-field corrector delivers sharp images of 0${^{\prime\prime}_{.}}$2 (FWHM) in HSC-i band over entire 1${^{\circ}_{.}}$5 diameter field view. collimation with respect to axis primary mirror done hexapod actuators, mechanical accuracy which a few microns. Analysis remaining wavefront error off-focus stellar reveals that components meets design specifications. While...
Hyper Suprime-Cam (HSC) is an 870 Mega pixel prime focus camera for the 8.2 m Subaru telescope. The wide field corrector delivers sharp image of 0.25 arc-sec FWHM in r-band over entire 1.5 degree (in diameter) view. collimation with respect to optical axis primary mirror realized by hexapod actuators whose mechanical accuracy few microns. As a result, we expect have seeing limited most time. Expected median 0.67 i-band. sensor p-ch fully depleted CCD 200 micron thickness (2048 x 4096 15 μm...
We report the discovery of 854 ultra-diffuse galaxies (UDGs) in Coma cluster using deep R band images, with partial B, i, and Hα coverage, obtained Subaru telescope. Many them (332) are Milky Way (MW) sized very large effective radii . This study was motivated by recent 47 UDGs Dokkum et al.; our suggests after accounting for smaller field (; about one-half Dragonfly). The new show a distribution concentrated around center, strongly suggesting that great majority (likely longtime) members....
The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most outstanding questions in astronomy today, including nature dark matter and energy. has been awarded 300 nights observing time Telescope it started March 2014. This paper presents first public data release HSC-SSP. includes taken 1.7 years observations (61.5 nights) each Wide, Deep, UltraDeep layers covers about 108, 26, 4 square degrees down to depths i~26.4, ~26.5,...
We report the discovery of primeval large-scale structures (LSSs) including two protoclusters in a forming phase at z = 5.7. carried out extensive deep narrowband imaging 1 deg2 sky Subaru/XMM-Newton Deep Field and obtained cosmic map 515 Lyα emitters (LAEs) volume with transverse dimension 180 Mpc × depth ~40 comoving units. This shows filamentary LSSs, clusters surrounding 10-40 scale voids, similar to present-day LSSs. Our spectroscopic follow-up observations identify overdense regions...
ABSTRACT We present a catalog of ultra-diffuse galaxies (UDGs) in the Coma cluster. UDGs are subset low surface brightness (SB) with very large effective radii defined by van Dokkum et al. surveyed Subaru data archive for deep Suprime-Cam/Subaru R -band images, and used covering 1.°7 × 2.°7 region The ∼1 magnitude deeper than al (2015a) limiting SB. This paper explains details our sample selection procedure. UDG includes positions, magnitudes, radii, mean central SBs, colors (when...
We found an unusual complex of narrow blue filaments, bright knots, and Hα-emitting filaments clouds, which morphologically resembled a "fireballs," extending up to 80 kpc south from E+A galaxy RB 199 in the Coma Cluster. The has highly disturbed morphology indicative galaxy-galaxy merger remnant. extend straight shapes toward galaxy, several knots are located at southern ends filaments. RC band absolute magnitudes, half-light radii, estimated masses ~–12 –13 mag, ~200-300 pc, ~106-107 M☉,...
Low surface brightness galaxies (LSBGs) are important for understanding galaxy evolution and cosmological models. The upcoming large-scale surveys expected to uncover a large number of LSBGs, requiring accurate automated or machine learning-based methods their detection. We study the scope transfer learning identification LSBGs. use transformer models divided into two categories: LSBG Detection Transformer (LSBG DETR) Vision ViT), trained on Dark Energy Survey (DES) data, identify LSBGs from...
Low-surface-brightness galaxies (LSBGs) are important for understanding galaxy evolution and cosmological models. Nevertheless, the physical properties of these objects remain unknown, as even detection LSBGs can be challenging. Upcoming large-scale surveys expected to uncover a large number LSBGs, which will require accurate automated or machine learning-based methods their detection. We study scope transfer learning identification LSBGs. used transformer models trained on Dark Energy...
We derived the luminosity function (LF) of dwarf galaxies in Coma Cluster down to MR = −10 at three fields located center, intermediate, and outskirt cluster. The LF (−19 < −10) shows no significant differences among fields. It a clear dip ∼ −13 is composed two distinct components different slopes; bright component with −19 has flatter slope than faint which steep slope. −13) consists mostly red extended including few blue whose colors are typical late-type galaxies. On other hand, (−13...
We present photometric recalibrations of the Subaru Deep Field (SDF) and Subaru/XMM-Newton Survey (SXDS). Recently, Yamanoi et al. (2012, AJ, 144, 40) suggested existence a discrepancy between SDF SXDS catalogs. have used Sloan Digital Sky (SDSS) Data Release 8 (DR8) catalog compared stars in common SDF/SXDS SDSS. confirmed that there exists 0.12 mag offset $ B$-band Moreover, we found significant zero-point offsets i$-band ($ \sim$ 0.10 mag) z$-band 0.14 need to be introduced catalogs make...
We study the galaxy population of Hydra I cluster in central region and a about 0.6 Mpc away from its center B RC bands down to M ∼ -10 using Subaru Suprime-Cam photometry. find that luminosity function entire has slightly steeper slope (α -1.6) range -20 < than those reported for other clusters brighter ranges. The appears be poorer clusters. number faint galaxies (M > -14) increases center, as well bright galaxies. is dominated by red dwarfs, shows significant upturn at -16, seen several...
Abstract This is the first in a series of papers on properties ultradiffuse galaxies (UDGs) clusters galaxies. We present an updated catalog UDGs Coma Cluster using g - and r -band images obtained with Hyper Suprime-Cam (HSC) Subaru telescope. develop method to find even presence contaminating objects, such as halos background study expands upon our previous works that covered about half area Cluster. The HSC observations whole up virial radius beyond (an twice large studies) doubled numbers...
We report the discovery of 854 ultra diffuse galaxies (UDGs) in Coma cluster using deep R band images, with partial B, i, and Halpha coverage, obtained Subaru telescope. Many them (332) are Milky Way-sized very large effective radii r_e>1.5kpc. This study was motivated by recent 47 UDGs van-Dokkum et al. (2015); our suggests >1,000 after accounting for smaller field. The new show a distribution concentrated around center, strongly suggesting that great majority (likely longtime) members....
Hyper Suprime-Cam (HSC) is the optical and near-infrared wide-field camera equipped on Subaru Telescope. Its huge field of view (1.5 degree diameter) with 104 CCDs large mirror (8.2m) telescope will make us to study Universe more efficiently. The analysis pipeline for HSC data produces processed images, object catalogs each CCD stacked images. For survey in next 5 years, number rows catalog table reach at least x 10<sup>9</sup>. We show outline database systems store those data.
We present the galaxy luminosity functions (LFs) of four Hickson Compact Groups using image data from Subaru Hyper Suprime-Cam. A distinct dip appeared in faint ends all LFs at Mg ∼ −12. similar was observed clusters Coma and Centaurus. However, Virgo, Hydra, field had flatter slopes no dips. As relative velocities among galaxies are lower compact groups than clusters, effect galaxy–galaxy interactions would be more significant groups. The −12 may imply that frequent affect evolution...
We describe a data providing system for Hyper Suprime-Cam (HSC) of Subaru Telescope. The provides HSC including images and catalogs celestial objects derived from them to individual co-investigators the Strategic Survey Program with through website. Users can select that they need by using its graphical user interface or writing query in SQL download selected catalogs.