Search Publications
MASTER OT J030227.28+191754.5: An unprecedentedly energetic dwarf nova outburst
Schramm, Malte; Maehara, Hiroyuki; Nogami, Daisaku +60 more
We present a detailed study of the MASTER OT J030227.28
Diffraction modelling of a 2023 March 5 stellar occultation by subkilometer-sized asteroid (98943) 2001 CC21
Arimatsu, Ko; Hirabayashi, Masatoshi; Akitaya, Hiroshi +31 more
We present an analysis of a stellar occultation event caused by a near-Earth asteroid (98943) 2001 CC21, an upcoming flyby target in the Hayabusa2 extended mission, on 2023 March 5. To determine the asteroid's shape from diffraction-affected light curves accurately, we developed a novel data-reduction technique named the Diffracted Occultation's U…
The extended halo and tidal tails of the old open cluster NGC 2112
Gao, Xinhua; Zhu, Chengyu
This paper investigates the spatial structure and tidal tails of the nearby (
Discovery of a hyperluminous quasar at z = 1.62 with Eddington ratio >3 in the eFEDS field confirmed by KOOLS-IFU on Seimei Telescope
Imanishi, Masatoshi; Ueda, Yoshihiro; Toba, Yoshiki +17 more
We report the discovery of a hyperluminous type 1 quasar (eFEDS J082826.9-013911; eFEDS J0828-0139) at
Q-band line survey observations toward a carbon-chain-rich clump in the Serpens South region
Lai, Shih-Ping; Liu, Sheng-Yuan; Nakamura, Fumitaka +17 more
We have conducted Q-band (30-50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with the extended Q-band (eQ) receiver installed on the Nobeyama 45 m radio telescope. Approximately 180 lines have been detected, including tentative detection, and these lines are attributed to 52 molecule…
Processing of hydrocarbon dust in star-forming galaxies revealed with AKARI
Oyabu, Shinki; Kaneda, Hidehiro; Murata, Katsuhiro L. +5 more
Hydrocarbon dust is one of the dominant components of interstellar dust, which mainly consists of polycyclic aromatic hydrocarbons and aliphatic hydrocarbons. While hydrocarbon dust is thought to be processed in interstellar radiation fields or shocks, detailed processing mechanisms are not completely understood yet. We investigate the processing …
Multi-epoch X-ray spectral analysis of Centaurus A: Revealing new constraints on iron emission line origins
Tanimoto, Atsushi; Bamba, Aya; Hagino, Kouichi +3 more
We conduct X-ray reverberation mapping and spectral analysis of the radio galaxy Centaurus A to uncover its central structure. We compare the light curve of the hard X-ray continuum from Swift Burst Alert Telescope observations with that of the Fe K
A comprehensive study of an oscillating eclipsing Algol: Y Camelopardalis
Kahraman Aliçavuş, Filiz; Çelik, Eda
Y Camelopardalis (Y Cam) is classified as one of the oscillating eclipsing Algol (oEA) systems, which feature a $\delta$ Scuti-type pulsating component alongside mass transfer phenomena. oEA systems are invaluable for probing the evolutionary processes and internal structures of binary components, offering insights through their binary variations …
KAgoshima Galactic Object survey with Nobeyama 45 m telescope by Mapping in Ammonia lines (KAGONMA): Discovery of parsec-scale CO depletion in the Canis Major star-forming region
Shimajiri, Yoshito; Sunada, Kazuyoshi; Omodaka, Toshihiro +6 more
In observational studies of infrared dark clouds, the number of detections of CO freeze-out on to dust grains (CO depletion) at the pc scale is extremely limited, and the conditions for its occurrence are, therefore, still unknown. We report a new object where pc-scale CO depletion is expected. As part of the Kagoshima Galactic Object survey with …
Suzaku observation of an iron K-shell line in the spiral galaxy NGC 6946
Yamauchi, Shigeo; Inaba, Azusa; Anraku, Yumiko
An emission line at ~6.7 keV is attributable to an He-like iron K-shell transition, which indicates existence of a thin thermal plasma with a temperature of several keV. Using Suzaku archival data, we searched for the iron K-line from the spiral galaxy NGC 6946, and found it at 6.68 ± 0.07 keV at the 3.1σ level in the central $r\le {2.^{\prime }5}…