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C Yamauchi,
S. Fujishima,
N Ikeda,
K Inada,
M. Katano,
H. Kataza, S. Makiuti,
K. Matsuzaki,
S. Takita,
Y Yamamoto,
I. Yamamura
[show abstract]
[hide abstract]
ABSTRACT: The AKARI All-Sky Catalogues are an important infrared astronomical database
for next-generation astronomy that take over the IRAS catalog. We have
developed an online service, AKARI Catalogue Archive Server (AKARI-CAS), for
astronomers. The service includes useful and attractive search tools and visual
tools.
One of the new features of AKARI-CAS is cached SIMBAD/NED entries, which can
match AKARI catalogs with other catalogs stored in SIMBAD or NED. To allow
advanced queries to the databases, direct input of SQL is also supported. In
those queries, fast dynamic cross-identification between registered catalogs is
a remarkable feature. In addition, multiwavelength quick-look images are
displayed in the visualization tools, which will increase the value of the
service.
In the construction of our service, we considered a wide variety of
astronomers' requirements. As a result of our discussion, we concluded that
supporting users' SQL submissions is the best solution for the requirements.
Therefore, we implemented an RDBMS layer so that it covered important
facilities including the whole processing of tables. We found that PostgreSQL
is the best open-source RDBMS products for such purpose, and we wrote codes for
both simple and advanced searches into the SQL stored functions. To implement
such stored functions for fast radial search and cross-identification with
minimum cost, we applied a simple technique that is not based on dividing
celestial sphere such as HTM or HEALPix. In contrast, the Web application layer
became compact, and was written in simple procedural PHP codes. In total, our
system realizes cost-effective maintenance and enhancements.
07/2011;
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[show abstract]
[hide abstract]
ABSTRACT: The nearby face-on spiral galaxy M101 has been observed with the Far-Infrared Surveyor (FIS) onboard AKARI. The far-infrared four-band images reveal fine spatial structures of M101, which include global spiral patterns, giant HII regions embedded in outer spiral arms, and a bar-like feature crossing the center. The spectral energy distribution of the whole galaxy shows the presence of the cold dust component (18 K) in addition to the warm dust component (55 K). The distribution of the cold dust is mostly concentrated near the center, and exhibits smoothly distributed over the entire extent of the galaxy, whereas the distribution of the warm dust indicates some correlation with the spiral arms, and has spotty structures such as four distinctive bright spots in the outer disk in addition to a bar-like feature near the center tracing the CO intensity map. The star-formation activity of the giant HII regions that spatially correspond to the former bright spots is found to be significantly higher than that of the rest of the galaxy. The latter warm dust distribution implies that there are significant star-formation activities in the entire bar filled with molecular clouds. Unlike our Galaxy, M101 is a peculiar normal galaxy with extraordinary active star-forming regions.
09/2007;
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H Murakami,
H Baba,
P. Barthel,
D. L. Clements,
M Cohen,
Y Doi,
K. Enya,
E. Figueredo,
N. Fujishiro,
H Fujiwara, [......],
F. Usui,
E. Verdugo,
T Wada,
L Wang,
T Watabe,
H Watarai,
G. J. White,
I. Yamamura,
C Yamauchi,
A Yasuda
[show abstract]
[hide abstract]
ABSTRACT: AKARI, the first Japanese satellite dedicated to infrared astronomy, was launched on 2006 February 21, and started observations in May of the same year. AKARI has a 68.5 cm cooled telescope, together with two focal-plane instruments, which survey the sky in six wavelength bands from the mid- to far-infrared. The instruments also have the capability for imaging and spectroscopy in the wavelength range 2 - 180 micron in the pointed observation mode, occasionally inserted into the continuous survey operation. The in-orbit cryogen lifetime is expected to be one and a half years. The All-Sky Survey will cover more than 90 percent of the whole sky with higher spatial resolution and wider wavelength coverage than that of the previous IRAS all-sky survey. Point source catalogues of the All-Sky Survey will be released to the astronomical community. The pointed observations will be used for deep surveys of selected sky areas and systematic observations of important astronomical targets. These will become an additional future heritage of this mission. Comment: 13 pages, 4 figures, and 3 tables. Accepted for publication in the AKARI special issue of the Publications of the Astronomical Society of Japan
08/2007;
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H Kaneda,
T Suzuki,
T Onaka,
Y Doi,
M Kawada,
B. -C. Koo, S. Makiuti,
T Nakagawa,
Y Okada,
S. Serjeant,
H Shibai,
M Shirahata
[show abstract]
[hide abstract]
ABSTRACT: Far-infrared (IR) images of the nearby Sb galaxy NGC2841 and the Sc galaxy NGC2976 at wavelengths of 65, 90, 140, and 160 um have been obtained with the Far-Infrared Surveyor (FIS) onboard AKARI. Both galaxies reveal similar morphologies of dust rings. They are, however, significantly different in the dust temperature: a cold (21 K) ring for NGC2841 and a warm (30 K) ring for NGC2976, which presumably reflects the difference in the origin of the ring structure for the different Hubble type of the galaxy. In addition to the dust ring structure, a warm dust component is detected from the central region of NGC2841, which may be attributed to the heating by its Low-Ionization Nuclear Emission-line Region nucleus. As for NGC2976, an extended dust component is observed along the minor axis, which shows a distribution somewhat asymmetrical to the galactic disk; this might be associated with the HI bridge in the M81/M82 group that NGC2976 belongs to. By taking advantage of a wealth of the far-IR bands of the FIS, it is demonstrated that the spectral energy distribution of NGC2841 is spatially more variable than that of NGC2976.
07/2007;
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S. Arimura,
H Shibai,
T. Teshima,
T Nakagawa,
M Narita, S. Makiuti,
Y Doi,
R. P. Verma,
S. K. Ghosh,
T. N. Rengarajan,
M Tanaka,
H Okuda
[show abstract]
[hide abstract]
ABSTRACT: We present the results of a wide-area mapping of the far-infrared continuum emission toward the Orion complex by using a Japanese balloon-borne telescope. The 155-um continuum emission was detected over a region of 1.5 deg^2 around the KL nebula with 3' resolution similar to that of the IRAS 100-um map. Assuming a single-temperature model of the thermal equilibrium dust, maps of the temperature and the optical depth were derived from the 155 um intensity and the IRAS 100 um intensity. The derived dust temperature is 5 - 15 K lower and the derived dust optical thickness were derived from the 155-um intensity and the IRAS 100-um intensity. The derived dust temperature is 5 - 15 K lower and the derived dust optical depth is 5 - 300 times larger than those derived from the IRAS 60 and 100-um intensities due to the significant contribution of the statistically heated very small grains to the IRAS 60-um intensity. The optical-thickness distribution shows a filamentary dust ridge that has a 1.5 degrees extent in the north - south direction and well resembles the Integral-Shaped Filament (ISF) molecular gas distribution. The gas-to-dust ratio derived from the CO molecular gas distribution along the ISF is in the range 30 - 200, which may be interpreted as being an effect of CO depletion due to the photodissociation and/or the freezing on dust grains.
04/2004;
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[show abstract]
[hide abstract]
ABSTRACT: We have developed a 4 8 array of stressed Ge:Ga detectors. This array detector has a high density format ofentrance pupils so that we can minimize the size of the cameraoptics. The cutoff wavelength of the detector is about 170 m, and the detector's NEP is better than 1016 WHz-1/2. We are going apply this array detector toballoon-borne astronomical observations. Furthermore, we aredeveloping this detector into a 5 15 array detector that will be placed onboard the IRIS satellite to be launched in 2003.
Experimental Astronomy 07/2000; 10(2):393-401. · 1.82 Impact Factor
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Y. Doi,
H. Okuda,
T. Nakagawa,
H. Kaneda,
M. Tanaka, S. Makiuti,
Y. Okamura,
H. Morimoto,
H. Shibai,
M. Kawada,
S. Arimura,
A. Ito,
S. Hirooka,
K. Okumura,
S. K. Ghosh,
B. Mookerjea,
D. Ojha,
T. N. Rengarajan,
R. P. Verma
[show abstract]
[hide abstract]
ABSTRACT: We have initiated a Japan-India collaborative project which surveys
far-infrared emission from star-formation regions using balloon-borne
telescopes. Two telescopes will be used for the observations. One is a
50-cm Japanese telescope equipped with a newly developed two-dimensional
array of stressed Ge:Ga detectors. With this telescope, we will carry
out a photometric survey of a 160-μm continuum with an angular
resolution of 1.5' and a detection limit of 10 Jy. The other is an
Indian 1-m telescope equipped with a Japanese Fabry-P&{acutee}rot
spectrometer in its focal plane. With this telescope, we will survey a
[C II] 158-μm spectrum line with a spatial resolution of 1.4' and a
detection limit of 3 x 10-5 ergs s-1
cm-2 sr-1. Our objectives are to observe galactic
star-formation regions as well as near-by external galaxies. By
combining the results observed using these telescopes, we will attempt
to reveal the energy balance between interstellar gas and dust. We will
make our first observational flights of these telescopes this winter.
During one observational flight, up to 100 square-degrees of the sky
will be surveyed in a 160-μm continuum and 1 square-degree of the sky
will be mapped in a 158-μm [C II] line emission.
11/1999; -1:399-400.
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07/1997; 401:313.
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[show abstract]
[hide abstract]
ABSTRACT: We present the results of an rocket-borne observation of far-infrared [CII] line at 157.7¯m from the diffuse interstellar medium in the Ursa Major. We also introduce a part of results on the [CII] emission recently obtained by the IRTS, a liquid-helium cooled 15cm telescope onboard the Space Flyer Unit. From the rocket-borne observation we obtained the cooling rate of the diffuse HI gas due to the [CII] line emission, which is 1:3 Sigma 0:2 Theta 10 Gamma26 ergss Gamma1 H Gamma1 atom . We also observed appreciable [CII] emission from the molecular clouds, with average CII/CO intensity ratio of 420. The IRTS observation provided the [CII] line emission distribution over large area of the sky along great circles crossing the Galactic plane at l = 50 ffi and l = 230 ffi . We found two components in their intensity distributions, one concentrates on the Galactic plane and the another extends over at least 20 ffi in Galactic latitude. We ascribe one component to the emissio...
04/1997;
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T. Nakagawa,
H. Okuda,
H. Shibai,
Y. Y. Yui,
Y. Doi,
K. Mochizuki,
T. Tohya, S. Makiuti,
K. Ishii,
T. Nishimura,
F. J. Low
124:228.
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VizieR Online Data Catalog. 2298.
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124:283.
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124:139.
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[show abstract]
[hide abstract]
ABSTRACT: The spectral characteristics of the diffuse galactic mid- and far infrared emission at λ = 10 – 60 μm are investigated using the IRTS and IRAS data. We estimate the grain temperature, total far-infrared intensity (FIR) and radiation density from the emission of the large grains at λ > 100 μm, assuming that the spectrum has a single temperature Planck function with a λ−2 emissivity law. We found that the spectral energy distribution of the diffuse galactic emission at wavelengths from 10 μm to 1 mm changed as a function of the dust temperature. In addition, we found clear correlation for the intensity of emissions at 12, 25, and 60 μm. The 12 μm intensity is proportional to FIR, and the ratios of the 25 and 60 μm intensities to FIR are proportional to the strength of the interstellar radiation field. These correlations are consistent with those found in the data of seven H II regions with various physical conditions. This suggests that the emitters of the emission at 12–60 μm are well mixed with large grains radiating at wavelength greater than 100 μm and implies that the ratio of the mass of these emitters to the mass of the large grains is constant in interstellar space. We conclude that the 12 μm emission is largely due to unidentified infrared features and that the 25 and 60 μm emission arises from very small grains transiently heated by multiple-photon
Advances in Space Research.
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H. Shibai,
S. Arimura,
M. Tanaka,
T. Teshima,
Y. Doi,
T. Nakagawa,
M. Narita, S. Makiuti,
N. Hiromoto,
M. Fujiwara,
H. Okuda,
A. Itoh
[show abstract]
[hide abstract]
ABSTRACT: The recent activity in balloon-borne infrared observations in Japan is reviewed. Following this, the new balloon-borne telescope project is described. Near- and far-infrared diffuse emissions from the galaxy were firstly surveyed by the balloon telescopes of Japanese groups. In addition to this, the wide area survey of [CII] 158 micron line emission was extensively executed. Those results revealed the large-scale structures of stars and the interstellar medium of the Galaxy. The new project, FIRBE (Far-Infrared Balloon-Borne Experiment), is a successor of them. The FIRBE project is focused on mapping of the far-infrared emission from the Galaxy and external galaxies with the same spatial resolution as that of the IRAS. This is an on-going project, and we are making balloon flights in Japan and in India.
Advances in Space Research.
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[show abstract]
[hide abstract]
ABSTRACT: The AKARI Infrared Astronomical Satellite observed the whole sky in the far infrared (50-180?m) and the mid-infrared (9 and 18?m) between May 2006 and August 2007 (Murakami et al. 2007PASJ...59S.369M) The AKARI?FIS All-Sky Survey Bright Source Catalog Version 1.0 provides positions and fluxes for 427071 point sources in the 4 far-infrared wavelengths centered at 65, 90, 140 and 160?m (see filter characteristics in the "Note (1)" section below)
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I Yamamura, S Makiuti,
N Ikeda,
Y Fukuda,
C Yamauchi,
S Hasegawa,
T Nakagawa,
H Narumi,
H Baba,
T Takagi, [......],
M Rowan-Robinson,
Do Kester,
G Wolk,
P Barthel,
A Salama,
C Alfageme,
P Garci?a-Lario,
C Stephenson,
M Cohen,
T G Mueller
[show abstract]
[hide abstract]
ABSTRACT: The infrared astronomy satellite ensuremath AKARIensuremath<?iensuremath> has made all-sky surveys at six wavelength bands (9, 18 ?m with the Infrared Camera (IRC), 65, 90, 140, and 160 ?m with the Far-Infrared Surveyor (FIS)). The first version of the FIS Bright Source Catalogue (ensuremathbeta?1) has been provided to the ensuremath AKARIensuremath<?iensuremath> science team for initial astronomical analyses. The catalogue will be made public in Autumn 2009 after further revisions. The IRC point source catalogue is in parallel preparation.
AIP Conference Proceedings;
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I Yamamura, S Makiuti,
N Ikeda,
Y Fukuda,
C Yamauchi,
S Hasegawa,
T Nakagawa,
H Narumi,
H Baba,
T Takagi, [......],
M Rowan-Robinson,
Do Kester,
G Wolk,
P Barthel,
A Salama,
C Alfageme,
P García-Lario,
C Stephenson,
M Cohen,
T G Mueller
[show abstract]
[hide abstract]
ABSTRACT: The AKARI satellite has made an All-Sky Survey at six bands in the mid- and far-infrared spectral region. One of the primary goals of the AKARI survey is to produce all-sky infrared source catalogues. We report the release of the first version of the AKARI FIS Bright Source Catalogue (ensuremathbeta-1) for four of the six wavelengths (65, 90, 140, 160 ensuremathmum), containing textttchar126 63,000 sources. The detection limit of the most sensitive band (90 ensuremathmum) is textttchar126 1.3 Jy, corresponding approximately to a 10 ensuremathsigma noise level. The photometric accuracy is 30?60%, depending on the band, and the position uncertainty, currently dominated by the FIS data processing, is 4?5 arcsec. The catalogue was prepared for initial scientific validation by the AKARI science team. The revised version will enter the public domain in Autumn 2009. The two other wavelength bands (9 & 18 ensuremathmum) data are processed separately for the IRC point source catalogues.
ASP Conference Series: AKARI, a Light to Illuminate the Misty Universe;
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I. Yamamura, S. Makiuti,
N Ikeda,
Y Fukuda,
C Yamauchi,
S Hasegawa,
T Nakagawa,
H. Narumi,
H Baba,
T Takagi, [......],
M. Rowan-Robinson,
Do Kester,
G. van der Wolk,
P. Barthel,
A Salama,
C. Alfageme,
P. García-Lario,
C. Stephenson,
M Cohen,
T. G. Mueller
[show abstract]
[hide abstract]
ABSTRACT: The AKARI satellite has made an All-Sky Survey at six bands in the mid- and far-infrared spectral region. One of the primary goals of the AKARI survey is to produce all-sky infrared source catalogues. We report the release of the first version of the AKARI FIS Bright Source Catalogue (β-1) for four of the six wavelengths (65, 90, 140, 160 μm), containing ~ 63,000 sources. The detection limit of the most sensitive band (90 μm) is ~ 1.3 Jy, corresponding approximately to a 10 σ noise level. The photometric accuracy is 30–60%, depending on the band, and the position uncertainty, currently dominated by the FIS data processing, is 4–5 arcsec. The catalogue was prepared for initial scientific validation by the AKARI science team. The revised version will enter the public domain in Autumn 2009. The two other wavelength bands (9 & 18 μm) data are processed separately for the IRC point source catalogues.
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S. Oyabu,
I. Yamamura,
C. Alfageme,
P. Barthel,
A. Cassatella,
M Cohen,
N Cox,
E. Figueredo,
H Fujiwara,
N Ikeda, [......],
S H Oh,
S. Oliver,
C. Pearson,
N. Rahman,
M. Rowan-Robinson,
A Salama,
R. Savage,
S. Serjeant,
G. J. White,
C Yamauchi
[show abstract]
[hide abstract]
ABSTRACT: Bright source catalogues based on the new mid- and far-infrared all-sky survey by the infrared astronomical satellite AKARI were released into the public domain in March 2010. The mid-infrared catalogue contains more than 870 thousand sources observed at 9 and 18 µm, and the far-infrared catalogue provides information of about 427 thousand sources at 65, 90, 140, and 160 µm. The AKARI catalogues will take over the IRAS catalogues and will become one of the most important catalogues in astronomy. We present the characteristics of the AKARI infrared source catalogues as well as current activity for the future versions.
