K. Sekiguchi
A5077861788- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- History and Developments in Astronomy
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Optical Systems and Laser Technology
- Scientific Research and Discoveries
- Geophysics and Sensor Technology
- Calibration and Measurement Techniques
- Ionosphere and magnetosphere dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Real-time simulation and control systems
National College Of Nursing
2024
Chibaken Saiseikai Narashino Hospital
2024
University of Lisbon
2024
National Astronomical Observatory of Japan
2010-2020
National Institutes of Natural Sciences
2012-2018
The Graduate University for Advanced Studies, SOKENDAI
2011-2016
Subaru (Japan)
2000-2011
Kyoto University
2001
South African Radio Astronomy Observatory
1988-1998
Astronomical Observatory
1988-1995
Context.The infrared wide-field camera (WFCAM) is now in operation on the 3.8 m UK Infrared Telescope Mauna Kea. WFCAM currently has fastest survey speed of any world, and combined with generous allocations telescope time, will produce deep maps sky from Z to K band. The data a set public surveys, known as UKIDSS, be initially available astronomers ESO member states, later world.
We present luminosity functions (LFs) and various properties of Lya emitters (LAEs) at z=3.1, 3.7, 5.7, in a 1 deg^2 sky the Subaru/XMM-Newton Deep Survey (SXDS) Field. obtain photometric sample 858 LAE candidates based on deep Subaru/Suprime-Cam imaging data, spectroscopic 84 confirmed LAEs from Subaru/FOCAS VLT/VIMOS spectroscopy survey volume ~10^6 Mpc^3 with limiting ~3x10^42 erg/s. derive LFs UV-continuum (~1500 Å) for each redshift, taking into account statistical error field-to-field...
We present the maps, source catalogue and number counts of largest, most complete unbiased extragalactic submillimetre survey ever undertaken: 850-micron SCUBA HAlf Degree Extragalactic Survey (SHADES). Using Submillimetre Common-User Bolometer Array (SCUBA) on James Clerk Maxwell Telescope (JCMT), SHADES mapped two separate regions sky: Subaru/XMM-Newton Deep Field (SXDF) Lockman Hole East (LH). These maps cover 720 square arcmin with an RMS noise level about 2 mJy have uncovered >100...
Abstract The Faint Object Camera and Spectrograph (FOCAS) is a Cassegrain optical instrument for the Subaru Telescope. Its capabilities include $6^\prime \phi$ FOV direct imaging, low-resolution spectroscopy ($R=250 \hbox{--} 2000$ with ${0\rlap {.}{}^{\mathrm {\prime \prime }}4}$ slitwidth), multi-slit polarimetry. We describe overall design of FOCAS, its observing functions, performance verification procedures that have been carried out.
We present multi-wave band optical imaging data obtained from observations of the Subaru/XMM-Newton Deep Survey (SXDS). The survey field, centered at R .A . = 02h18m00s, decl − 05°00'00'', has been focus a wide range multiwavelength observing programs spanning X-ray to radio wavelengths. A large part are carried out with Suprime-Cam on Subaru Telescope Mauna Kea in course "Observatory Projects." This paper describes our observations, reduction and analysis procedures employed,...
Abstract We present new results of a deep optical imaging survey using narrow band filter (NB921) centered at ${\lambda = 9196 \,\mbox{Å}}$ together with $B, V, R, i^\prime$, and $z^\prime$ broadband filters in the sky area Subaru Deep Field, which has been promoted as one legacy programs 8.2m Telescope. obtained photometric sample 58 $\mathrm{Ly}\,\alpha$ emitter candidates $z \approx 6.5 \hbox{--} 6.6$ among $\sim 180$ strong NB921-excess ($z^\prime-\mathit{NB921} \gt 1.0...
view Abstract Citations (284) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Steps toward Determination of the Size and Structure Broad-Line Region in Active Galactic Nuclei. VIII. an Intensive HST, IUE, Ground-based Study NGC 5548 Korista, K. T. ; Alloin, D. Barr, P. Clavel, J. Cohen, R. Crenshaw, M. Evans, I. N. Horne, Koratkar, A. Kriss, G. Krolik, H. Malkan, Morris, S. L. Netzer, O'Brien, Peterson, B. Reichert, Rodriguez-Pascual,...
We report the discovery of primeval large-scale structures (LSSs) including two protoclusters in a forming phase at z = 5.7. carried out extensive deep narrowband imaging 1 deg2 sky Subaru/XMM-Newton Deep Field and obtained cosmic map 515 Lyα emitters (LAEs) volume with transverse dimension 180 Mpc × depth ~40 comoving units. This shows filamentary LSSs, clusters surrounding 10-40 scale voids, similar to present-day LSSs. Our spectroscopic follow-up observations identify overdense regions...
This paper defines the UKIRT Infrared Deep Sky Survey (UKIDSS) Early Data Release (EDR). UKIDSS is a set of five large near-infrared surveys being undertaken with United Kingdom Telescope Wide Field Camera (WFCAM). The programme began in 2005 May and has an expected duration 7 yr. Each survey uses some or all broad-band filter complement ZY JHK. EDR first public release data to European Southern Observatory (ESO) community. All worldwide releases occur after delay 18 months from ESO release....
We have performed a deep optical imaging survey using narrowband filter ($NB921$) centered at $\lambda =$ 9196 \AA ~ together with $i^\prime$ and $z^\prime$ broadband filters covering an 814 arcmin$^2$ area of the Subaru Deep Field. obtained sample 73 strong $NB921$-excess objects based on following two color criteria; $z^\prime - NB921 > 1$ $i^\prime z^\prime 1.3$. then spectroscopy nine in our sample, identified least Ly$\alpha$ emitters at$z=6.541 \pm 0.002$ $z=6.578 0.002$, each which...
We describe deep radio imaging at 1.4 GHz of the 1.3-deg2 Subaru/XMM–Newton Deep Field (SXDF), made with Very Large Array in B and C configurations. present a map entire field, catalogue 505 sources covering 0.8 deg2 to peak flux density limit 100 μJy. Robust optical identifications are provided for 90 per cent sources, suggested presented all but 14 (of which seven optically blank, close bright contaminating objects). show that properties do not change density, suggesting active galactic...
We present new results on the cosmological evolution of near-infrared (near-IR) galaxy luminosity function (LF), derived from analysis a sample ∼22 000 KAB≤ 22.5 galaxies selected over an area 0.6 deg2 Early Data Release UKIDSS Ultra Deep Survey (UDS). Our study has exploited multiwavelength coverage UDS field provided by WFCAM K- and J-band imaging, Subaru/XMM–Newton Spitzer Wide-Area Infrared Extragalactic survey. The unique combination large depth this survey minimizes complicating effect...
We present the X-ray source catalog in Subaru/XMM-Newton deep survey. A continuous area of 1.14 deg^2 centered at R.A. = 02h18m and Dec. -05d is mapped by seven pointings with XMM-Newton covering 0.2-10 keV band. From combined images EPIC pn MOS cameras, we detect 866, 1114, 645, 136 sources sensitivity limits 6x10^{-16}, 8x10^{-16}, 3x10^{-15}, 5x10^{-15} erg cm^{-2} s^{-1} 0.5-2, 0.5-4.5, 2-10, 4.5-10 bands, respectively, detection likelihood >= 7 (corresponding to a confidence level...
An 8 month monitoring campaign on the Seyfert 1 galaxy Fairall 9 has been conducted with International Ultraviolet Explorer in an attempt to obtain reliable estimates of continuum-continuum and continuum-emission-line delays for a high-luminosity active galactic nucleus (AGN). While results this are more ambiguous than those previous campaigns lower luminosity sources, we find general agreement earlier results: (1) there is no measurable lag between ultraviolet continuum bands, (2) measured...
We use the deep wide-field optical imaging data of Subaru/XMM-Newton Deep Survey (SXDS) to discuss luminosity (mass) dependent galaxy colours down z'=25.0 (5 x 10^9 h_{70}^{-2} Msun) for z~1 galaxies in colour-selected high density regions. find an apparent absence on red colour-magnitude sequence below z'~24.2, corresponding ~M*+2 (~10^{10} with respect passively evolving at z~1. Galaxies brighter than M*-0.5 (8 10^{10} Msun), however, are predominantly systems, few blue star forming these...
Abstract The Subaru Deep Field (SDF) project is a program of Observatory to carry out deep galaxy survey over blank field as large $34' \times 27'$. consists very multi-band optical imaging, near-infrared imaging for smaller portions the field, and follow-up spectroscopy. major scientific goals are construct samples Lyman-break galaxies at $z \simeq 4 \hbox{--} 5$ Lyman alpha emitters 5.7$ 6.6, make detailed studies these high-redshift populations. In this paper, we describe observations...
An overview of the current status 8.2 m Subaru Telescope constructed and operated at Mauna Kea, Hawaii, by National Astronomical Observatory Japan is presented. The basic design concept verified performance telescope system are described. Also given instrument package offered to astronomical community, operation, some future plans. reported in a number SPIE papers as summer 2002 incorporated with updates included 2004 February. However, readers encouraged check most updated through home...
We present spectroscopic and photometric observations of SN 1987a in the Large Magellanic Cloud, made at Sutherland field station SAAO Cape Town for days 51–134 after Kamiokande-II neutrino event. During this period, both bolometric flux from supernova apparent angular radius photosphere reached a maximum subsequently declined. Some discussion is included based on comparison between derived fluxes those predicted by selected theoretical models.
We present spectroscopic and photometric observations of SN 1987a in the Large Magellanic Cloud made at Sutherland field station SAAO Cape Town during first 50 days after its discovery was announced.
We present the results of a search for galaxy clusters in Subaru-XMM Deep Field. reach depth total cluster flux 0.5-2 keV band 2x10^{-15} ergs cm^{-2} s^{-1} over one widest XMM-Newton contiguous raster surveys, covering an area 1.3 square degrees. Cluster candidates are identified through wavelet detection extended X-ray emission. The red sequence technique allows us to identify 57 candidates. report on progress with spectroscopic follow-up and derive their properties based luminosity...
We study the extent to which very bright (-23.0 < MUV -21.75) Lyman-break selected galaxies at redshifts z~7 display detectable Lya emission. To explore this issue, we have obtained follow-up optical spectroscopy of 9 from a parent sample 24 galaxy candidates 1.65 sq.deg COSMOS-UltraVISTA and SXDS-UDS survey fields using latest near-infrared public data, new ultra-deep Subaru z'-band imaging (which also present describe in paper). Our has yielded only one possible detection z=7.168 with...
This paper describes the performance of XMM-Newton for serendipitous surveys and summarises scope potential Serendipitous Survey. The role Survey Science Centre (SSC) in project is outlined. SSC's follow-up identification programme survey described together with presentation some first results.
Deep near-infrared images of a blank 2'x2' section sky near the Galactic north pole taken by Subaru Telescope are presented. The total integration times J and K' bands 12.1 hours 9.7 hours, resulting in 5-sigma limiting magnitudes 25.1 23.5 mag, respectively. numbers sources within these found with an automated detection procedure 385 band 350 K'. Based on photometric measurements sources, we present number count vs. magnitude relations, color diagrams, size relationships, etc. slope galaxy...