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1,007 results on '"Terai, T."'

1. The SUrvey for Pulsars and Extragalactic Radio Bursts II: New FRB discoveries and their follow-up

Author

Bhandari, S., Keane, E. F., Barr, E. D., Jameson, A., Petroff, E., Johnston, S., Bailes, M., Bhat, N. D. R., Burgay, M., Burke-Spolaor, S., Caleb, M., Eatough, R. P., Flynn, C., Green, J. A., Jankowski, F., Kramer, M., Krishnan, V. Venkatraman, Morello, V., Possenti, A., Stappers, B., Tiburzi, C., van Straten, W., Andreoni, I., Butterley, T., Chandra, P., Cooke, J., Corongiu, A., Coward, D. M., Dhillon, V. S., Dodson, R., Hardy, L. K., Howell, E. J., Jaroenjittichai, P., Klotz, A., Littlefair, S. P., Marsh, T. R., Mickaliger, M., Muxlow, T., Perrodin, D., Pritchard, T., Sawangwit, U., Terai, T., Tominaga, N., Torne, P., Totani, T., Trois, A., Turpin, D., Niino, Y., Wilson, R. W., and Collaboration, The ANTARES

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report the discovery of four Fast Radio Bursts (FRBs) in the ongoing SUrvey for Pulsars and Extragalactic Radio Bursts (SUPERB) at the Parkes Radio Telescope: FRBs 150610, 151206, 151230 and 160102. Our real-time discoveries have enabled us to conduct extensive, rapid multi-messenger follow-up at 12 major facilities sensitive to radio, optical, X-ray, gamma-ray photons and neutrinos on time scales ranging from an hour to a few months post-burst. No counterparts to the FRBs were found and we provide upper limits on afterglow luminosities. None of the FRBs were seen to repeat. Formal fits to all FRBs show hints of scattering while their intrinsic widths are unresolved in time. FRB 151206 is at low Galactic latitude, FRB 151230 shows a sharp spectral cutoff, and FRB 160102 has the highest dispersion measure (DM = $2596.1\pm0.3$ pc cm$^{-3}$) detected to date. Three of the FRBs have high dispersion measures (DM >$1500$ pc cm$^{-3}$), favouring a scenario where the DM is dominated by contributions from the Intergalactic Medium. The slope of the Parkes FRB source counts distribution with fluences $>2$ Jyms is $\alpha=-2.2^{+0.6}_{-1.2}$ and still consistent with a Euclidean distribution ($\alpha=-3/2$). We also find that the all-sky rate is $1.7^{+1.5}_{-0.9}\times10^3$FRBs/($4\pi$ sr)/day above $\sim2$ Jyms and there is currently no strong evidence for a latitude-dependent FRB sky-rate., Comment: 21 pages, 8 figures and accepted for publication in MNRAS

Published
2017
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2. The Hyper Suprime-Cam SSP Survey: Overview and Survey Design

Author

Aihara, H., Arimoto, N., Armstrong, R., Arnouts, S., Bahcall, N. A., Bickerton, S., Bosch, J., Bundy, K., Capak, P. L., Chan, J. H. H., Chiba, M., Coupon, J., Egami, E., Enoki, M., Finet, F., Fujimori, H., Fujimoto, S., Furusawa, H., Furusawa, J., Goto, T., Goulding, A., Greco, J. P., Greene, J. E., Gunn, J. E., Hamana, T., Harikane, Y., Hashimoto, Y., Hattori, T., Hayashi, M., Hayashi, Y., Hełminiak, K. G., Higuchi, R., Hikage, C., Ho, P. T. P., Hsieh, B. -C., Huang, K., Huang, S., Ikeda, H., Imanishi, M., Inoue, A. K., Iwasawa, K., Iwata, I., Jaelani, A. T., Jian, H. -Y., Kamata, Y., Karoji, H., Kashikawa, N., Katayama, N., Kawanomoto, S., Kayo, I., Koda, J., Koike, M., Kojima, T., Komiyama, Y., Konno, A., Koshida, S., Koyama, Y., Kusakabe, H., Leauthaud, A., Lee, C. -H., Lin, L., Lin, Y. -T., Lupton, R. H., Mandelbaum, R., Matsuoka, Y., Medezinski, E., Mineo, S., Miyama, S., Miyatake, H., Miyazaki, S., Momose, R., More, A., More, S., Moritani, Y., Moriya, T. J., Morokuma, T., Mukae, S., Murata, R., Murayama, H., Nagao, T., Nakata, F., Niida, M., Niikura, H., Nishizawa, A. J., Obuchi, Y., Oguri, M., Oishi, Y., Okabe, N., Okura, Y., Ono, Y., Onodera, M., Onoue, M., Osato, K., Ouchi, M., Price, P. A., Pyo, T. -S., Sako, M., Okamoto, S., Sawicki, M., Shibuya, T., Shimasaku, K., Shimono, A., Shirasaki, M., Silverman, J. D., Simet, M., Speagle, J., Spergel, D. N., Strauss, M. A., Sugahara, Y., Sugiyama, N., Suto, Y., Suyu, S. H., Suzuki, N., Tait, P. J., Takata, T., Takada, M., Tamura, N., Tanaka, M. M., Tanaka, M., Tanaka, Y., Terai, T., Terashima, Y., Toba, Y., Toshikawa, J., Turner, E. L., Uchida, T., Uchiyama, H., Umetsu, K., Uraguchi, F., Urata, Y., Usuda, T., Utsumi, Y., Wang, S. -Y., Wang, W. -H., Wong, K. C., Yabe, K., Yamada, Y., Yamanoi, H., Yasuda, N., Yeh, S., Yonehara, A., and Yuma, S.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2m Subaru telescope on the summit of Maunakea in Hawaii. A team of scientists from Japan, Taiwan and Princeton University is using HSC to carry out a 300-night multi-band imaging survey of the high-latitude sky. The survey includes three layers: the Wide layer will cover 1400 deg$^2$ in five broad bands ($grizy$), with a $5\,\sigma$ point-source depth of $r \approx 26$. The Deep layer covers a total of 26~deg$^2$ in four fields, going roughly a magnitude fainter, while the UltraDeep layer goes almost a magnitude fainter still in two pointings of HSC (a total of 3.5 deg$^2$). Here we describe the instrument, the science goals of the survey, and the survey strategy and data processing. This paper serves as an introduction to a special issue of the Publications of the Astronomical Society of Japan, which includes a large number of technical and scientific papers describing results from the early phases of this survey., Comment: 14 pages, 7 figures, 5 tables. Corrected for a typo in the coordinates of HSC-Wide spring equatorial field in Table 5

Published
2017
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3. A Fast Radio Burst Host Galaxy

Author

Keane, E. F., Johnston, S., Bhandari, S., Barr, E., Bhat, N. D. R., Burgay, M., Caleb, M., Flynn, C., Jameson, A., Kramer, M., Petroff, E., Possenti, A., van Straten, W., Bailes, M., Burke-Spolaor, S., Eatough, R. P., Stappers, B. W., Totani, T., Honma, M., Furusawa, H., Hattori, T., Morokuma, T., Niino, Y., Sugai, H., Terai, T., Tominaga, N., Yamasaki, S., Yasuda, N., Allen, R., Cooke, J., Jencson, J., Kasliwal, M. M., Kaplan, D. L., Tingay, S. J., Williams, A., Wayth, R., Chandra, P., Perrodin, D., Berezina, M., Mickaliger, M., and Bassa, C.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

In recent years, millisecond duration radio signals originating from distant galaxies appear to have been discovered in the so-called Fast Radio Bursts. These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity which, in tandem with a redshift measurement, can be used for fundamental physical investigations. While every fast radio burst has a dispersion measurement, none before now have had a redshift measurement, due to the difficulty in pinpointing their celestial coordinates. Here we present the discovery of a fast radio burst and the identification of a fading radio transient lasting $\sim 6$ days after the event, which we use to identify the host galaxy; we measure the galaxy's redshift to be $z=0.492\pm0.008$. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionised baryons in the intergalactic medium of $\Omega_{\mathrm{IGM}}=4.9 \pm 1.3\%$, in agreement with the expectation from WMAP, and including all of the so-called "missing baryons". The $\sim6$-day transient is largely consistent with a short gamma-ray burst radio afterglow, and its existence and timescale do not support progenitor models such as giant pulses from pulsars, and supernovae. This contrasts with the interpretation of another recently discovered fast radio burst, suggesting there are at least two classes of bursts., Comment: Published in Nature, 2016 Feb 25

Published
2016
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5. The infrared imaging spectrograph (IRIS) for TMT: Latest science cases and simulations

Author

Wright, SA, Walth, G, Do, T, Marshall, D, Larkin, JE, Moore, AM, Adamkovics, M, Andersen, D, Armus, L, Barth, A, Cote, P, Cooke, J, Chisholm, EM, Davidge, T, Dunn, JS, Dumas, C, Ellerbroek, BL, Ghez, AM, Hao, L, Hayano, Y, Liu, M, Lopez-Rodriguez, E, Lu, JR, Mao, S, Marois, C, Pandey, SB, Phillips, AC, Schoeck, M, Subramaniam, A, Subramanian, S, Suzuki, R, Tan, JC, Terai, T, Treu, T, Simard, L, Weiss, JL, Wincentsen, J, Wong, M, and Zhang, K

Subjects
Infrared Imaging, Infrared Spectroscopy, Integral Field Spectrographs, Adaptive Optics, Data Simulator, Giant Segmented Mirror Telescopes, astro-ph.IM
Abstract

The Thirty Meter Telescope (TMT) first light instrument IRIS (Infrared Imaging Spectrograph) will complete its preliminary design phase in 2016. The IRIS instrument design includes a near-infrared (0.85-2.4 micron) integral field spectrograph (IFS) and imager that are able to conduct simultaneous diffraction-limited observations behind the advanced adaptive optics system NFIRAOS. The IRIS science cases have continued to be developed and new science studies have been investigated to aid in technical performance and design requirements. In this development phase, the IRIS science team has paid particular attention to the selection of filters, gratings, sensitivities of the entire system, and science cases that will benefit from the parallel mode of the IFS and imaging camera. We present new science cases for IRIS using the latest end-To-end data simulator on the following topics: Solar System bodies, the Galactic center, active galactic nuclei (AGN), and distant gravitationally-lensed galaxies. We then briefly discuss the necessity of an advanced data management system and data reduction pipeline.

Published
2016

6. Ocular findings in Japanese children with Down syndrome: the course of visual acuity and refraction, and systemic and ocular anomalies

Author

Terai T, Eda S, Sugasawa J, Tonari M, Matsuo J, Oku H, and Ikeda T

Subjects
astigmatism, Down syndrome, hyperopia, refraction, visual acuity, Ophthalmology, RE1-994
Abstract

Tomoko Terai,1,2 Shohei Eda,1,2 Jun Sugasawa,2 Masahiro Tonari,2 Junko Matsuo,2 Hidehiro Oku,2 Tsunehiko Ikeda2 1Department of Ophthalmology, Shiga Medical Center for Children, Moriyama-City, Shiga, Japan; 2Department of Ophthalmology, Osaka Medical College, Takatsuki-City, Osaka, Japan Purpose: To investigate the age-related development of refractive errors and changes of visual acuity (VA), and the systemic and ocular anomalies in Japanese children and young adults with Down syndrome (DS).Design: Retrospective cohort study.Subjects and methods: This study involved 222 Japanese children and young adults with DS (age range: 3 months to 19 years) seen at the Department of Ophthalmology, Shiga Medical Center for Children, Shiga, Japan. The subjects were divided into the following six age groups: 1) infant (age 0 to

Published
2018

12. The host galaxy of a fast radio burst

Author

Keane, E.F., Johnston, S., Bhandari, S., Barr, E., Bhat, N.D.R., Burgay, M., Caleb, M., Flynn, C., Jameson, A., Kramer, M., Petroff, E., Possenti, A., van Straten, W., Bailes, M., Burke-Spolaor, S., Eatough, R.P., Stappers, B.W., Totani, T., Honma, M., Furusawa, H., Hattori, T., Morokuma, T., Niino, Y., Sugai, H., Terai, T., Tominaga, N., Yamasaki, S., Yasuda, N., Allen, R., Cooke, J., Jencson, J., Kasliwal, M.M., Kaplan, D.L., Tingay, S.J., Williams, A., Wayth, R., Chandra, P., Perrodin, D., Berezina, M., Mickaliger, M., and Bassa, C.

Subjects
Telescope -- Usage -- Research, Pulsars -- Observations -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

In recent years, millisecond-duration radio signals originating in distant galaxies appear to have been discovered in the so-called fast radio bursts (1-9). These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity, which, in tandem with a redshift measurement, can be used for fundamental physical investigations (10,11). Every fast radio burst has a dispersion measurement, but none before now have had a redshift measurement, because of the difficulty in pinpointing their celestial coordinates. Here we report the discovery of a fast radio burst and the identification of a fading radio transient lasting ~6 days after the event, which we use to identify the host galaxy; we measure the galaxy's redshift to be z = 0.492 ± 0.008. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionized baryons in the intergalactic medium of [Ω.sub.IGM] = 4.9 ± 1.3 per cent, in agreement with the expectation from the Wilkinson Microwave Anisotropy Probe (12), and including all of the so-called 'missing baryons'. The ~6-day radio transient is largely consistent with the radio afterglow of a short γ-ray burst (13), and its existence and timescale do not support progenitor models such as giant pulses from pulsars, and supernovae. This contrasts with the interpretation (8) of another recently discovered fast radio burst, suggesting that there are at least two classes of bursts., As part of the SUrvey for Pulsars and Extragalactic Radio Bursts (SUPERB) project at the Parkes radio telescope, we perform real-time searches of the sky at high time resolution (see [...]

Published
2016

22. Does Direct Invasion of Peripancreatic Lymph Nodes Impact Survival in Patients with Pancreatic Ductal Adenocarcinoma? a Retrospective Dual-Center Study

Author

Hashimoto, D., primary, Satoi, S., additional, Ishida, M., additional, Nakagawa, K., additional, Kotsuka, M., additional, Takagi, T., additional, Ryota, H., additional, Terai, T., additional, Sakaguchi, T., additional, Nagai, M., additional, Yamaki, S., additional, Akahori, T., additional, Yamamoto, T., additional, Sekimoto, M., additional, and Sho, M., additional

Published
2022
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29. Latest design of liquid lithium target in IFMIF

Author

Nakamura, H., Agostini, P., Ara, K., Cevolani, S., Chida, T., Ciotti, M., Fukada, S., Furuya, K., Garin, P., Gessii, A., Guisti, D., Heinzel, V., Horiike, H., Ida, M., Jitsukawa, S., Kanemura, T., Kondo, H., Kukita, Y., Lösser, R., Matsui, H., Micciche, G., Miyashita, M., Muroga, T., Riccardi, B., Simakov, S., Stieglitz, R., Sugimoto, M., Suzuki, A., Tanaka, S., Terai, T., Yagi, J., Yoshida, E., and Wakai, E.

Published
2008
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