Search Publications
The AKARI/IRC mid-infrared all-sky survey
García-Lario, P.; Müller, T. G.; Ohyama, Y. +30 more
Context. AKARI is the first Japanese astronomical satellite dedicated to infrared astronomy. One of the main purposes of AKARI is the all-sky survey performed with six infrared bands between 9 µm and 200 µm during the period from 2006 May 6 to 2007 August 28. In this paper, we present the mid-infrared part (9 µm and 18 µm b…
Evolution of infrared luminosity functions of galaxies in the AKARI NEP-deep field. Revealing the cosmic star formation history hidden by dust
Le Floc'h, E.; Im, M.; Lee, H. M. +19 more
Aims: Dust-obscured star-formation increases with increasing intensity and increasing redshift. We aim to reveal the cosmic star-formation history obscured by dust using deep infrared observation with AKARI.
Methods: We constructed restframe 8 µm, 12 µm, and total infrared (TIR) luminosity functions (LFs) at 0.15 < z < …
Near-IR integral field spectroscopy of ionizing stars and young stellar objects on the borders of H II regions
Martins, F.; Zavagno, A.; Bouret, J. C. +2 more
Aims: We study three Galactic H ii regions - RCW 79, RCW 82, and RCW 120 - where triggered star formation is taking place. Two stellar populations are observed: the ionizing stars of each H ii region and young stellar objects on their borders. Our goal is to show that they represent two distinct populations, as expected from successive star-f…
Neptune's atmospheric composition from AKARI infrared spectroscopy
Fletcher, L. N.; Encrenaz, T.; Burgdorf, M. +2 more
Aims: Disk-averaged infrared spectra of Neptune between 1.8 and 13 µm, obtained by the AKARI infrared camera (IRC) in May 2007, have been analysed to (a) determine the globally-averaged stratospheric temperature structure; (b) derive the abundances of stratospheric hydrocarbons; and (c) detect fluorescent emission from CO at 4.7 µ…
Star formation and dust extinction properties of local galaxies from the AKARI-GALEX all-sky surveys . First results from the most secure multiband sample from the far-ultraviolet to the far-infrared
Buat, V.; Burgarella, D.; Takeuchi, T. T. +5 more
Aims: We explore spectral energy distributions (SEDs), star formation (SF), and dust extinction properties of galaxies in the Local Universe.
Methods: The AKARI all-sky survey provided the first bright point source catalog detected at 90 µm. Beginning with this catalog, we selected galaxies by matching the AKARI sources with those …
Spectroscopic observations of ices around embedded young stellar objects in the Large Magellanic Cloud with AKARI
Onaka, T.; Sakon, I.; Kaneda, H. +4 more
Aims: The aim of this study is to understand the chemical conditions of ices around embedded young stellar objects (YSOs) in the metal-poor Large Magellanic Cloud (LMC).
Methods: We performed near-infrared (2.5-5 µm) spectroscopic observations toward 12 massive embedded YSOs and their candidates in the LMC using the infrared camera…
Polycyclic aromatic hydrocarbon (PAH) luminous galaxies at z ~ 1
Im, M.; Lee, H. M.; White, G. J. +14 more
Aims: The NEP-deep survey, an extragalactic AKARI survey towards the north ecliptic pole (NEP), provides a comprehensive wavelength coverage from 2 to 24 µm using all 9 photometric bands of the infrared camera (IRC). It allows us to photometrically identify galaxies whose mid-IR emission is clearly dominated by PAHs.
Methods: We pr…
Herschel images of NGC 6720: H2 formation on dust grains
Walker, H. J.; Ivison, R. J.; Blommaert, J. A. D. L. +27 more
Herschel PACS and SPIRE images have been obtained of NGC 6720 (the Ring nebula). This is an evolved planetary nebula with a central star that is currently on the cooling track, due to which the outer parts of the nebula are recombining. From the PACS and SPIRE images we conclude that there is a striking resemblance between the dust distribution an…
V4332 Sagittarii: a circumstellar disc obscuring the main object
Schmidt, M.; Tylenda, R.; Kamiński, T.
Context. V4332 Sgr experienced an outburst in 1994 whose observational characteristics in many respects resemble those of the eruption of V838 Mon in 2002. It has been proposed that these objects erupted because of a stellar-merger event.
Aims: Our aim is to derive, from observational data, information on the present (10-15 yrs after the outb…
Large-scale distributions of mid- and far-infrared emission from the center to the halo of M 82 revealed with AKARI
Ohyama, Y.; Wada, T.; Onaka, T. +6 more
Context. The edge-on starburst galaxy M 82 exhibits complicated distributions of gaseous materials in its halo, which include ionized superwinds driven by nuclear starbursts, neutral materials entrained by the superwinds, and large-scale neutral streamers probably caused by a past tidal interaction with M 81.
Aims: We investigate detailed dis…