@tomonoritotani
東京大学の天文学専攻で、研究と教育にあたっています。専門は宇宙論、銀河の形成と進化、超新星やガンマ線バーストなどの高エネルギー天体現象など。Astrophysicist at Dept. Astronomy, Univ. of Tokyo
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■日本学術会議とは 日本学術会議は、人文・社会科学や生命科学、理工など国内約87万人の科学者を代表し、科学政策について政府に提言したり、科学の啓発活動をしたりするために1949年に設立された。「学者の…
Proxima b is a terrestrial-mass planet in the habitable-zone of Proxima Centauri. Proxima Centauri's high stellar activity however casts doubt on the habitability of Proxima b: sufficiently bright...
We report Spitzer Space Telescope observations during predicted transits of the exoplanet Proxima Centauri b. As the nearest terrestrial habitable-zone planet we will ever discover, any potential...
In the far future long after star formation has ceased the universe will be populated by sparse degenerate remnants, mostly white dwarfs, though their ultimate fate is an open question. These...
この国の若者にとって「博士」はもはや魅力のない仕事ということなのか。文部科学省が先ごろ公表した2022年度学校基本調査(速報)によると、大学院博士課程に在籍する学生数は7万5267人で2年続けて減った。修士課程を終えて博士課程に進学する割合は2000年に約17%あったが、その後低下傾向にあり、ここ10年はずっと10%を割り込んでいる。科学技術立国をうたってきたのに、日本は博士の存在感が薄い社
The star S2 orbiting the compact radio source Sgr A* is a precision probe of the gravitational field around the closest massive black hole (candidate). Over the last 2.7 decades we have monitored...
The claimed detection of a diffuse galaxy lacking dark matter represents a possible challenge to our understanding of the properties of these galaxies and galaxy formation in general. The galaxy,...
It was recently proposed that the globular cluster system of the very low surface-brightness galaxy NGC1052-DF2 is dynamically very cold, leading to the conclusion that this dwarf galaxy has...
The recent identification of a candidate very massive 70 M(Sun) black hole is at odds with our current understanding of stellar winds and pair-instability supernovae. We investigate alternate...
It is well known that, following the emergence of the first evidence for an expanding universe, Albert Einstein banished the cosmological constant term from his cosmology. Indeed, he is reputed to...
Observations of the redshift z=7.085 quasar J1120+0641 have been used to search for variations of the fine structure constant, alpha, over the redshift range 5.5 to 7.1. Observations at z=7.1...
岐阜県飛騨市のお礼の品や地域情報を紹介。お礼の品や地域情報が満載のふるさと納税No.1サイト「ふるさとチョイス」なら、地域の魅力を知ったうえで、あなたが応援したい地域に簡単・便利にふるさと納税で寄付ができます。
東京大学木曽観測所は2019年3月20日、同観測所の105cmシュミット望遠鏡に取り付けられた超広視野CMOSカメラ「Tomo-e Gozen(トモエゴゼン)」を用いた観測により、地球接近小惑星「20
An observer moving with respect to the cosmic rest frame should observe a concentration and brightening of galaxies in the direction of motion and a spreading and dimming in the opposite...
The standard cold dark matter plus cosmological constant model predicts that galaxies form within dark-matter haloes, and that low-mass galaxies are more dark-matter dominated than massive ones....
Concordant evidence points towards the existence of a ninth planet in the Solar System at more than $400\,$AU from the Sun. In particular, trans-Neptunian object orbits are perturbed by the...
Long gamma-ray bursts (GRB), explosions of very massive stars, provide crucial information on stellar and galaxy evolution, even at redshifts z ~ 8 - 9.5, when the Universe was only 500-600...
今から840年ほど前の1181年、夜空に明るく輝く超新星が出現したことが、中国や日本の記録に残されています。超新星は当時「客星」と呼ばれ、日本では藤原定家の『明月記』などに記録が残っています。 同じく『明月記』に記録が残る1054年の超新星
This paper reports a re-analysis of archival ALMA data of the high velocity (-width) compact cloud (HVCC) CO-0.40-0.22, which has recently been hypothesized to host an intermediate-mass black Hole...
Essentially everything of astronomical interest is either part of a galaxy, or from a galaxy, or otherwise relevant to the origin or evolution of galaxies. Diverse examples are that the isotropic...
We report on the population properties of 76 compact binary mergers detected with gravitational waves below a false alarm rate of 1 per year through GWTC-3. The catalog contains three classes of...
We present optical spectrophotometry of the red supergiant Betelgeuse from 2020 February 15, during its recent unprecedented dimming episode. By comparing this spectrum to stellar atmosphere...
Join us to hear exciting IceCube results! Thursday, November 3, 1:00 - 2:00 pm U.S. CDT ...
We report the detection of continuous positional and polarization changes of the compact source SgrA* in high states ('flares') of its variable near- infrared emission with the near-infrared...
We study the impact of the COVID-19 pandemic on astronomy using public records of astronomical publications. We show that COVID-19 has had both positive and negative impacts on research in...
We present a measurement of the Hubble constant ($H_{0}$) and other cosmological parameters from a joint analysis of six gravitationally lensed quasars with measured time delays. All lenses except...
Models of the Sun's long-term evolution suggest that its luminosity was substantially reduced 2-4 billion years ago, which is inconsistent with substantial evidence for warm and wet conditions in...
Earth went through at least two periods of global glaciation (i.e., ``Snowball Earth'' states) during the Neoproterozoic, the shortest of which (the Marinoan) may not have lasted sufficiently long...
東京大学 大学院理学系研究科・理学部のプレスリリース情報です。
Global warming is one of the problems of human civilization and decarbonization policy is the main solution to this problem. In this work, we propose using the gravity-assist by the asteroids to...
2020年2月3日、東京大学の戸谷友則教授が『宇宙における生命〜どのように生まれたのか、そして命の星はいくつあるのか』と題したプレスリリースを行ないました。生命がどのように発生したか(1/6)
2021年のノーベル物理学賞に米プリンストン大学上席研究員の真鍋淑郎氏の受賞が決まった。日本人のノーベル賞受賞者は米国籍を含め28人目。出身大学別で東京大学9人(自然科学分野は6人)、京都大学8人と両大卒が圧倒的に多いが、高校別ではほとん…