Yuu Niino
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View article: Second-timescale Glints from Satellites and Space Debris Detected with Tomo-e Gozen
Second-timescale Glints from Satellites and Space Debris Detected with Tomo-e Gozen Open
A search for second-timescale optical transients is one of the frontiers of time-domain astronomy. However, it has been pointed out that reflections of sunlight from Earth-orbiting objects can also produce second-timescale ``glints.'' We c…
View article: The Host Galaxy of FRB 20190520B and Its Unique Ionized Gas Distribution
The Host Galaxy of FRB 20190520B and Its Unique Ionized Gas Distribution Open
The properties of host galaxies associated with fast radio bursts (FRBs) provide critical information for inferring the progenitors and radiation mechanisms of these bursts. We report on the host galaxy of the repeating FRB 20190520B, a dw…
View article: The Host Galaxy of FRB 20190520B and Its Unique Ionized Gas Distribution
The Host Galaxy of FRB 20190520B and Its Unique Ionized Gas Distribution Open
The properties of host galaxies associated with Fast Radio Bursts (FRBs) provide critical information for inferring the progenitors and radiation mechanisms of these bursts. We report on the host galaxy of the repeating FRB 20190520B, a dw…
View article: ALMA reveals spatially-resolved properties of molecular gas in the host galaxy of FRB 20191001A at z = 0.2340
ALMA reveals spatially-resolved properties of molecular gas in the host galaxy of FRB 20191001A at z = 0.2340 Open
We report the detection of the CO(2-1) emission line with a spatial resolution of 0.9 arcsec ($3.5 \mathrm{kpc}$) from the host galaxy of the fast radio burst (FRB), FRB 20191001A at $z=0.2340$, using the Atacama Large Millimeter/submillim…
View article: ALMA Reveals Spatially Resolved Properties of Molecular Gas in the Host Galaxy of FRB 20191001A at z = 0.2340
ALMA Reveals Spatially Resolved Properties of Molecular Gas in the Host Galaxy of FRB 20191001A at z = 0.2340 Open
We report the detection of the CO(2–1) emission line with a spatial resolution of 0.″9 (3.5 kpc) from the host galaxy of the fast radio burst (FRB), FRB 20191001A at z = 0.2340, using the Atacama Large Millimeter/submillimeter Array. This …
View article: An optical gamma-ray burst catalogue with measured redshift – I. Data release of 535 gamma-ray bursts and colour evolution
An optical gamma-ray burst catalogue with measured redshift – I. Data release of 535 gamma-ray bursts and colour evolution Open
We present the largest optical photometry compilation of gamma-ray bursts (GRBs) with redshifts (z). We include 64813 observations of 535 events (including upper limits) from 28 February 1997 to 18 August 2023. We also present a user-frien…
View article: Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey
Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey Open
We studied the optical variability of 241 BL Lacertae (BL Lacs) and 83 flat-spectrum radio quasars (FSRQs) from the 4LAC catalog using data from the Tomo-e Gozen Northern Sky Transient Survey, with ∼50 epochs per blazar on average. We excl…
View article: Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey
Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey Open
We studied the optical variability of 241 BL Lacs and 83 flat-spectrum radio quasars (FSRQ) from the 4LAC catalog using data from the Tomo-e Gozen Northern Sky Transient Survey, with $\sim$ 50 epochs per blazar on average. We excluded blaz…
View article: Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material
Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material Open
We present photometric, spectroscopic, and polarimetric observations of the intermediate-luminosity Type IIP supernova (SN) 2021gmj from 1 to 386 d after the explosion. The peak absolute V-band magnitude of SN 2021gmj is −15.5 mag, which i…
View article: Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material
Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material Open
We present photometric, spectroscopic and polarimetric observations of the intermediate-luminosity Type IIP supernova (SN) 2021gmj from 1 to 386 days after the explosion. The peak absolute V-band magnitude of SN 2021gmj is -15.5 mag, which…
View article: A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey
A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey Open
The population of optical transients evolving within a time-scale of a few hours or a day (so-called fast optical transients, FOTs) has recently been debated extensively. In particular, our understanding of extragalactic FOTs and their rat…
View article: A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey
A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey Open
The population of optical transients evolving within a time-scale of a few hours or a day (so-called fast optical transients, FOTs) has recently been debated extensively. In particular, our understanding of extragalactic FOTs and their rat…
View article: Follow-up Survey for the Binary Black Hole Merger GW200224_222234 Using Subaru/HSC and GTC/OSIRIS
Follow-up Survey for the Binary Black Hole Merger GW200224_222234 Using Subaru/HSC and GTC/OSIRIS Open
The LIGO/Virgo detected a gravitational wave (GW) event, named GW200224_222234 (also known as S200224ca) and classified as a binary-black hole coalescence, on 2020 February 24. Given its relatively small localization skymap (71 deg 2 for a…
View article: Follow-up survey for the binary black hole merger GW200224_222234 using Subaru/HSC and GTC/OSIRIS
Follow-up survey for the binary black hole merger GW200224_222234 using Subaru/HSC and GTC/OSIRIS Open
The LIGO/Virgo detected a gravitational wave (GW) event, named GW200224_222234 (a.k.a. S200224ca) and classified as a binary-black-hole coalescence, on February 24, 2020. Given its relatively small localization skymap (71 deg$^2$ for a 90%…
View article: Diverse Properties of Molecular Gas in the Host Galaxies of Fast Radio Bursts
Diverse Properties of Molecular Gas in the Host Galaxies of Fast Radio Bursts Open
We report the properties of molecular gas in a sample of six host galaxies of fast radio bursts (FRBs) obtained from CO observations with the Atacama Large Millimeter/submillimeter Array (FRBs 20180924B, 20190102C, and 20190711A), the resu…
View article: Diverse Properties of Molecular Gas in the Host Galaxies of Fast Radio Bursts
Diverse Properties of Molecular Gas in the Host Galaxies of Fast Radio Bursts Open
We report the properties of molecular gas in a sample of six host galaxies of fast radio bursts (FRBs) obtained from CO observations with the Atacama Large Millimeter/submillimeter Array (FRBs 20180924B, 20190102C, and 20190711A) and resul…
View article: Video observations of tiny near-Earth objects with Tomo-e Gozen
Video observations of tiny near-Earth objects with Tomo-e Gozen Open
We report the results of video observations of tiny (diameter less than 100 m) near-Earth objects (NEOs) with Tomo-e Gozen on the Kiso 105 cm Schmidt telescope. The rotational period of a tiny asteroid reflects its dynamical history and ph…
View article: A repeating fast radio burst associated with a persistent radio source
A repeating fast radio burst associated with a persistent radio source Open
The dispersive sweep of fast radio bursts (FRBs) has been used to probe the ionized baryon content of the intergalactic medium 1 , which is assumed to dominate the total extragalactic dispersion. Although the host-galaxy contributions to t…
View article: Deep Simultaneous Limits on Optical Emission from FRB 20190520B by 24.4 fps Observations with Tomo-e Gozen
Deep Simultaneous Limits on Optical Emission from FRB 20190520B by 24.4 fps Observations with Tomo-e Gozen Open
We conduct 24.4 fps optical observations of repeating fast radio burst (FRB) 20190520B using Tomo-e Gozen, a high-speed CMOS camera mounted on the Kiso 105 cm Schmidt telescope, simultaneously with radio observations carried out using the …
View article: Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment
Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment Open
In this Letter we report a discovery of a prominent flash of a peculiar overluminous Type Ia supernova, SN 2020hvf, in about 5 hr of the supernova explosion by the first wide-field mosaic CMOS sensor imager, the Tomo-e Gozen Camera. The fa…
View article: A repeating FRB in a dense environment with a compact persistent radio source
A repeating FRB in a dense environment with a compact persistent radio source Open
Fast radio bursts (FRBs) are the most energetic radio transients in the Universe, the central engines of which remain unknown and could be diverse. The dispersion sweeps of FRBs provide a unique probe of the ionized baryon content of the i…
View article: A highly active repeating fast radio burst in a complex local environment
A highly active repeating fast radio burst in a complex local environment Open
The central engine of fast radio bursts (FRB) is not yet understood. Due to the interaction between the pulse and the intervening plasma, the dispersion sweep of FRBs provides a unique probe of its environment and the ionized baryon conten…
View article: Dispersion measure components within host galaxies of Fast Radio Bursts: observational constraints from statistical properties of FRBs
Dispersion measure components within host galaxies of Fast Radio Bursts: observational constraints from statistical properties of FRBs Open
Dispersion measure (DM) of Fast Radio Bursts (FRBs) are commonly used as a indicator of distance assuming that DM in excess of the expected amount within the Milky Way in the direction of each FRB arise mostly from the inter-galactic mediu…
View article: A limit on the optical transient in the galaxy associated with Fast Radio Burst 150418
A limit on the optical transient in the galaxy associated with Fast Radio Burst 150418 Open
We have searched for optical variability in the host galaxy of the radio variable source which is possibly associated with fast radio burst (FRB) 150418. We compare images of the galaxy taken 1 day after the burst using Subaru/Suprime-Cam …
View article: Luminous quasars do not live in the most overdense regions of galaxies at <i>z</i> ∼ 4
Luminous quasars do not live in the most overdense regions of galaxies at <i>z</i> ∼ 4 Open
We present the cross-correlation between 151 luminous quasars (MUV < −26) and 179 protocluster candidates at z ∼ 3.8, extracted from the Wide imaging survey (∼121 deg2) performed as part of the Hyper Suprime-Cam Subaru Strategic Program…
View article: The SUrvey for Pulsars and Extragalactic Radio Bursts – II. New FRB discoveries and their follow-up
The SUrvey for Pulsars and Extragalactic Radio Bursts – II. New FRB discoveries and their follow-up Open
[EN] We report the discovery of four Fast Radio Bursts (FRBs) in the ongoing SUrvey for Pulsars and Extragalactic Radio Bursts at the Parkes Radio Telescope: FRBs 150610, 151206, 151230 and 160102. Our real-time discoveries have enabled us…
View article: A SYSTEMATIC SURVEY of PROTOCLUSTERS at z â¼ 3-6 in the CFHTLS DEEP FIELDS
A SYSTEMATIC SURVEY of PROTOCLUSTERS at z â¼ 3-6 in the CFHTLS DEEP FIELDS Open
© 2016. The American Astronomical Society. All rights reserved. We present the discovery of three protoclusters at z â¼ 3-4 with spectroscopic confirmation in the Canada-France-Hawaii Telescope Legacy Survey Deep Fields. In these fields,…
View article: The redshifted selected sample of long gamma-ray burst host galaxies: the complete metallicity measurements at $z \leq 0.41$
The redshifted selected sample of long gamma-ray burst host galaxies: the complete metallicity measurements at $z \leq 0.41$ Open
We present the complete list of host galaxy metallicities for all long GRBs whose redshifts were determined to be $\leq 0.41$ before the end of March 2014, including newly obtained spectroscopic datasets of the host galaxies of GRB 060614,…