Search Publications
AKARI NEP field: Point source catalogs from GALEX and Herschel observations and selection of candidate lensed sub-millimeter galaxies
Goto, Tomotsugu; Burgarella, Denis; Pearson, Chris +9 more
The AKARI Wide North Ecliptic field is one of the most important cosmological fields because it lies in the continuous viewing zones for many space telescopes, e.g., Herschel, HST, and JWST, and it is also a natural high-visibility field from the L2 halo orbit. The field will be also the location of the deep survey for the Euclid mission. Finally,…
Solar jet-like features rooted in flare ribbons
Hou, Yijun; Yang, Shuhong; Zhang, Jun +1 more
Employing the high spatio-temporal Interface Region Imaging Spectrograph 1330 Å observations, we investigated the jet-like features that occurred during the X8.2 class flare in NOAA active region (AR) 12673 on 2017 September 10. These jet-like features were rooted in the flare ribbons. We examined 15 features, and the mean values of the lifetimes,…
Large angular scale fluctuations of near-infrared extragalactic background light based on the IRTS observations
Jeong, Woong-Seob; Lee, Hyung Mok; Tanaka, Masahiro +4 more
We measure the spatial fluctuations of the Near-Infrared Extragalactic Background Light (NIREBL) from 2° to 20° in angular scale at the 1.6 and 2.2 µ m using data obtained with Near-Infrared Spectrometer (NIRS) on board the Infrared Telescope in Space (IRTS). The brightness of the NIREBL is estimated by subtracting foreground components such…
Ionization age of iron ejecta in the Galactic Type Ia supernova remnant G306.3-0.9
Uchida, Hiroyuki; Bamba, Aya; Tsuru, Takeshi Go +5 more
We present a 190 ks observation of the Galactic supernova remnant (SNR) G306.3-0.9 with Suzaku. To study ejecta properties of this possible Type Ia SNR, the absolute energy-scale at the Fe-K band was calibrated to a level of uncertainty less than 10 eV by a cross-calibration with the Hitomi microcalorimeter using the Perseus cluster spectra. This …
Radio-infrared correlation for local dusty galaxies and dusty AGNs from the AKARI All-Sky Survey
Pollo, Agnieszka; Bilicki, Maciej; Takeuchi, Tsutomu T. +3 more
We use the new release of the AKARI Far-Infrared All-Sky Survey (FIS) matched with the NVSS radio database to investigate the local (z < 0.25) far-infrared-radio correlation (FIRC) of different types of extragalactic sources. To obtain the redshift information for the AKARI FIS sources we cross-match the catalogue with the SDSS DR8. This also a…
Star formation and polycyclic aromatic hydrocarbons in ELAIS N1 galaxies as seen by AKARI
Burgarella, Denis; Oyabu, Shinki; Kaneda, Hidehiro +4 more
We have examined the relationship between star formation and polycyclic aromatic hydrocarbons (PAHs) in a variety of galaxies. PAHs are excited by the ultraviolet photons of young stars, but they are disassociated by strong UV radiation in starbursts. Therefore their emission (which is in the wavelength range covered by AKARI) can be used as a sta…
NSV 1440: first WZ Sge-type object in AM CVn stars and candidates
Nogami, Daisaku; Myers, Gordon; Monard, Berto +5 more
In 2015 and 2017, the AM CVn candidate NSV 1440 showed superoutbursts that had the characteristic features of WZ Sge-type dwarf novae (DNe). By analogy with hydrogen-rich cataclysmic variables (CVs), we can interpret these outbursts as "double superoutbursts" which are composed of a first superoutburst with early superhumps and a second superoutbu…
X-ray and optical observations of the black hole candidate MAXI J1828-249
Makishima, Kazuo; Ueda, Yoshihiro; Itoh, Ryosuke +8 more
We report results from X-ray and optical observations of the Galactic black hole candidate MAXI J1828-249 performed with Suzaku and the Kanata telescope around the X-ray flux peak in the 2013 outburst. The time-averaged X-ray spectrum covering 0.6-168 keV was approximately characterized by a strong multi-color disk blackbody component with an inne…
Annual parallax measurements of a semi-regular variable star SV Pegasus with VERA
Honma, Mareki; Nakagawa, Akiharu; Nagayama, Takahiro +6 more
Many studies have shown that there are clear sequences in the period-luminosity relationship (PLR) for Mira variables and semi-regular variables (SRVs) in the Large Magellanic Cloud (LMC). To investigate the PLR for SRVs in our galaxy, we examined the annual parallax measurement and conducted K'-band photometric monitoring of an SRV star SV Pegasu…
A systematic study of ULIRGs using near-infrared absorption bands reveals a strong UV environment in their star-forming regions
Nakagawa, Takao; Baba, Shunsuke; Isobe, Naoki +3 more
We present a systematic study of the 3.0 µm H2O ice and the 3.4 µm aliphatic carbon absorption features toward 48 local ultraluminous infrared galaxies (ULIRGs) using spectra obtained by the AKARI Infrared Camera to investigate the UV environment in their star-forming regions. All the ULIRGs in our sample exhibit a ratio of …