Search Publications
AKARI/IRC near-infrared asteroid spectroscopic survey: AcuA-spec
Hasegawa, Sunao; Onaka, Takashi; Usui, Fumihiko +1 more
Knowledge of water in the solar system is important for the understanding of a wide range of evolutionary processes and the thermal history of the solar system. To explore the existence of water in the solar system, it is indispensable to investigate hydrated minerals and/or water ice on asteroids. These water-related materials show absorption fea…
CO multi-line imaging of nearby galaxies (COMING). IV. Overview of the project
Nakanishi, Hiroyuki; Seta, Masumichi; Salak, Dragan +36 more
Observations of the molecular gas in galaxies are vital to understand the evolution and star-forming histories of galaxies. However, galaxies with molecular gas maps of their whole discs at sufficient resolution to distinguish galactic structures are severely lacking. Millimeter-wavelength studies at a high angular resolution across multiple lines…
On the different levels of dust attenuation to nebular and stellar light in star-forming galaxies
Yamamura, Issei; Koyama, Yusei; Kodama, Tadayuki +2 more
As a science verification study of the newly released AKARI/FIS Faint Source Catalog ver. 1, this paper discusses the different levels of dust attenuation toward stellar light and nebular emission lines within local star-forming galaxies at 0.02 < z < 0.10. By constructing an updated version of the AKARI-SDSS-GALEX matched galaxy catalog (wi…
The Herschel-PACS North Ecliptic Pole Survey
Goto, Tomotsugu; Kim, Seong Jin; Pearson, Chris +9 more
A detailed analysis of Herschel/Photoconductor Array Camera and Spectrometer (PACS) observations at the North Ecliptic Pole is presented. High-quality maps, covering an area of 0.44 deg2, are produced and then used to derive potential candidate source lists. A rigorous quality-control pipeline has been used to create final legacy catalo…
A systematic study of Galactic infrared bubbles along the Galactic plane with AKARI and Herschel
Oyabu, Shinki; Kaneda, Hidehiro; Ishihara, Daisuke +7 more
Galactic infrared (IR) bubbles, which have shell-like structures in the mid-IR wavelengths, are known to contain massive stars near their centers. Infrared bubbles in inner Galactic regions (|l| ≤ 65°, |b| ≤ 1°) have so far been studied well to understand the massive star formation mechanisms. In this study, we expand the research area to the whol…
Infrared luminosity functions based on 18 mid-infrared bands: revealing cosmic star formation history with AKARI and Hyper Suprime-Cam*
Momose, Rieko; Hashimoto, Tetsuya; Goto, Tomotsugu +21 more
Much of star formation is obscured by dust. For a complete understanding of the cosmic star formation history (CSFH), infrared (IR) census is indispensable. AKARI carried out deep mid-infrared observations using its continuous nine-band filters in the North Ecliptic Pole (NEP) field (5.4 deg2). This took a significant amount of the sate…
Investigation of the origin of the anomalous microwave emission in Lambda Orionis
Doi, Yasuo; Onaka, Takashi; Kaneda, Hidehiro +5 more
The anomalous microwave emission (AME) still lacks a conclusive explanation. This excess of emission, roughly between 10 and 50 GHz, tends to defy attempts to explain it as synchrotron or free-free emission. The overlap with frequencies important for cosmic microwave background explorations, combined with a strong correlation with interstellar dus…
Characteristics of mid-infrared PAH emission from star-forming galaxies selected at 250 µm in the North Ecliptic Pole field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +11 more
Evolutionary properties of infrared (IR) luminous galaxies are important keys to understand dust-obscured star formation history and galaxy evolution. Based on near- to mid-IR imaging with nine continuous filters of the AKARI space telescope, we present the characteristics of dusty star-forming (SF) galaxies showing polycyclic aromatic hydrocarbon…
Does AGN fraction depend on redshift or luminosity? An extinction-free test by 18-band near- to mid-infrared SED fitting in the AKARI NEP wide field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +3 more
Revealing what fraction of galaxies harbor active galactic nuclei (AGNs) is central to understanding the black hole accretion history of the universe. However, optical and soft X-ray surveys miss the most highly obscured AGNs. Infrared (IR), instead, is more robust against absorption. Previous IR photometric surveys, however, only had four or five…
Discovery of a strong ionized-gas outflow in an AKARI-selected ultra-luminous infrared galaxy at z = 0.5
Yamamura, Issei; Noda, Hirofumi; Kokubo, Mitsuru +5 more
In order to construct a sample of ultra-luminous infrared galaxies (ULIRGs; with infrared luminosity LIR > 1012 L_{⊙}) at 0.5 < z < 1, we are conducting an optical follow-up program for bright 90 µm far-infrared sources with a faint optical (i < 20 mag) counterpart selected in the AKARI Far-Infrared Surveyor…