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Post Info TOPIC: AKARI Images
Blobrana


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AKARI All-Sky Catalogues
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Title: AKARI-CAS --- Online Service for AKARI All-Sky Catalogues
Authors: C. Yamauchi, S. Fujishima, N. Ikeda, K. Inada, M. Katano, H. Kataza, S. Makiuti, K. Matsuzaki, S. Takita, Y. Yamamoto, I. Yamamura

The AKARI All-Sky Catalogues are an important infrared astronomical database for next-generation astronomy that take over the IRAS catalogue. 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 catalogues with other catalogues 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 catalogues is a remarkable feature. In addition, multiwavelength quick-look images are displayed in the visualisation 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 realises cost-effective maintenance and enhancements.

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Blobrana


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Posts: 131433
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AKARI Point Source Catalogues
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The AKARI Point Source Catalogues Public Release

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AKARI (ASTRO-F) Catalogue Archive Server

The AKARI Catalogue Archive Server (AKARI-CAS) provides user interfaces to search and obtain catalogue data and related information of AKARI FIS and IRC all-sky survey. All data of catalogues are constructed by AKARI team. Details of source catalogues are described in AKARI Point Source Catalogues page.
The FIS and IRC source catalogues are registered into RDBMS of the DARTS server. Using the database, AKARI-CAS provides two types of tools, 'Search Tools' and 'Visual Tools'.
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Blobrana


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RE: AKARI Images
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Two new sets of observations from the AKARI Infrared Space Telescope, JAXA mission with ESA participation, show how the spaceborne telescope has investigated galaxies both near and far.
 In the first set, Toyoaki Suzuki, University of Tokyo, observed M101, a spiral galaxy 170 thousand light years in diameter. AKARIs new observations reveal differing populations of stars spread across its spiral arms.
AKARI observed the galaxy at four infrared wavelengths (65, 90, 140, and 160 micrometres) using the Far-Infrared Surveyor (FIS) instrument. Many young high-temperature stars populate the spiral arms, revealing the areas of star formation and warming the interstellar dust. This causes the galaxy to shine at shorter infrared wavelengths. In contrast, the longer wavelengths show where the cold dust is located. Normal stars, typically like our own Sun, warm this dust.

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Blobrana


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One year after the beginning of its scientific operations, the high-capability infrared satellite AKARI continues to produce stunning views of the infrared Universe.

All-sky map in infrared light
dwnl_img.gifarwp.gifHI-RES JPEG
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This image shows the entire sky in infrared light at nine micrometres. The bright stripe extending from left to right is the disc of our own Milky Way Galaxy. Several bright regions corresponding to strong infrared radiation appear along or next to the Galactic Plane. These regions are sites of newly born stars. At the brightest region in the very centre of the image, towards the centre of our Galaxy, old stars crowd together. AKARI observed the infrared radiation emitted from the heated interstellar dust.
Credits: JAXA

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-- Edited by Blobrana at 16:25, 2007-07-11

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Blobrana


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(SNR) B0104-72.3
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Title: AKARI Detection of the Infrared-Bright Supernova Remnant B0104-72.3 in the Small Magellanic Cloud
Authors: Bon-Chul Koo, Ho-Gyu Lee, Dae-Sik Moon, Jae-Joon Lee, Ji Yeon Seok, Hyung Mok Lee, Seung Soo Hong, Myung Gyoon Lee, Hidehiro Kaneda, Yoshifusa Ita, Woong-Seob Jeong, Takashi Onaka, Itsuki Sakon, Takao Nakagawa, Hiroshi Murakami

We present a serendipitous detection of the infrared-bright supernova remnant (SNR) B0104-72.3 in the Small Magellanic Cloud by the Infrared Camera (IRC) onboard AKARI. An elongated, partially complete shell is detected in all four observed IRC bands covering 2.6-15 um. The infrared shell surrounds radio, optical, and X-ray emission associated with the SNR and is probably a radiative SNR shell. This is the first detection of a SNR shell in this near/mid-infrared waveband in the Small Magellanic Cloud. The IRC colour indicates that the infrared emission might be from shocked H2 molecules with some possible contributions from ionic lines. We conclude that B0104-72.3 is a middle-aged SNR interacting with molecular clouds, similar to the Galactic SNR IC 443. Our results highlight the potential of AKARI IRC observations in studying SNRs, especially for diagnosing SNR shocks.

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Blobrana


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RE: AKARI Images
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Expand (964kb, 1500 x 2548)
Credit JAXA

This false-colour composite image was taken by the AKARI satellite in near- and mid-infrared wavelengths (3, 7 and 11 microns), and shows a portion of the Large Magellanic Cloud.
This galaxy, a place of intense star formation, was observed by AKARI during its whole-sky survey and, for this image, during detailed observations.
In addition to the interstellar clouds, many stars in the Large Magellanic Cloud can be seen as white dots.

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Blobrana


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The Japan Aerospace Exploration Agency's (JAXA) infrared astronomical satellite AKARI continues its mission to map the entire sky in infrared light. AKARI commenced the mission's All-Sky Survey observations in May, 2006 and will finish its first coverage of the entire sky in November. The estimated completeness of the coverage at the finish of the first coverage will be about 70 percent, which is what was expected, since some areas were known not to be presently observable due to disturbances by the Moon and other reasons.
During the survey observations, AKARI investigated one of the most important targets for studies of the formation of galaxies, the Large Magellanic Cloud, with more wavelength bands than has ever been made in the past, producing stunning images of our nearest neighbour in the Universe.

LMC_akari
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Far-Infrared image of the Large Magellanic Cloud by AKARI
(False-colour composite from images at 60, 90 and 140 microns).
Image of the Large Magellanic Cloud. This figure is a part of that data covering about 6x6 degrees (corresponding to a physical size of 17,000 x 17,000 light years at the distance of the galaxy)

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Blobrana


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AKARI, the new Japanese infrared sky surveyor mission in which ESA is participating, saw ‘first light’ on 13 April 2006 (UT) and delivered its first images of the cosmos. The images were taken towards the end of a successful checkout of the spacecraft in orbit.

The mission, formerly known as ASTRO-F, was launched on 21 February 2006 (UT) from the Uchinoura Space Centre in Japan. Two weeks after launch the satellite reached its final destination in space – a polar orbit around Earth located at an altitude of approximately 700 kilometres.

On 13 April, during the second month of the system checkout and verification of the overall satellite performance, the AKARI telescope’s aperture lid was opened and the on-board two instruments commenced their operation. These instruments - the Far Infrared Surveyor (FIS) and the near-mid-infrared camera (IRC) - make possible an all-sky survey in six infrared wavebands. The first beautiful images from the mission have confirmed the excellent performance of the scientific equipment beyond any doubt.

AKARI’s two instruments were pointed toward the reflection nebula IC4954, a region situated about 6000 light years away, and extending more than 10 light years across space. Reflection nebulae are clouds of dust which reflect the light of nearby stars. In these infrared images of IC4954 ­ a region of intense star formation active for several million years – it is possible to pick out individual stars that have only recently been born. They are embedded in gas and dust and could not be seen in visible light. It is also possible to see the gas clouds from which these stars were actually created.

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