We present an 82ks Chandra ACIS-I observation of a large-scale hierarchical complex, which consists of various clusters/groups of galaxies and low surface brightness X-ray emission at z=0.247. This high-resolution Chandra observation allows us for the first time to separate unambiguously the X-ray contributions from discrete sources and large-scale diffuse hot gas. We detect 99 X-ray sources in a 17{arcmin}x17{arcmin} field.
We demonstrate the use of the AKARI all-sky survey photometric data in the study of galactic star formation. Our aim was to select young stellar objects (YSOs) in the AKARI Far-Infrared Surveyor (FIS) Bright Source Catalogue. We used AKARI/FIS and Wide-field Infrared Survey Explorer (WISE) data to derive mid- and far-infrared colors of YSOs. Classification schemes based on quadratic discriminant analysis (QDA) have been given for YSOs and the training catalog for QDA was the whole-sky selection of previously known YSOs (i.e., listed in the SIMBAD database). A new catalog of AKARI FIS YSO candidates including 44001 sources has been prepared; the reliability of the classification is over 90%, as tested in comparison to known YSOs. As much as 76% of our YSO candidates are from previously uncatalogued types. The vast majority of these sources are Class I and II types according to the Lada classification. The distribution of AKARI FIS YSOs is well correlated with that of the galactic ISM; local over-densities were found on infrared loops and towards the cold clumps detected by Planck.
The AKARI/FIS Bright Source Catalogue Version 1.0 provides the positions and fluxes of 427,071 point sources in the four far-infrared wavelengths centred at 65, 90, 140, and 160 microns. The sensitivity in the 90 micron band is about 0.55 Jy.
The Far-Infrared Surveyor (FIS) instrument scanned 98 percent of the entire sky more than twice during the 16 months of the cryogenic mission phase. The AKARI/FIS Bright Source Catalogue is the primary data product from the AKARI survey. The catalogue is designed to have a uniform detection limit (corresponding to per scan sensitivity) over the entire sky (except for high background regions where a different data acquisition mode was used). Redundant observations are used to increase the reliability of the detection.
AKARI/FIS All-Sky Survey Bright Source Catalog, Version 1
Short Name:
AKARIBSC
Date:
14 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The AKARI Infrared Astronomical Satellite observed the whole sky in the far-infrared (50-180 microns or um) and the mid-infrared (9 and 18 um) between May 2006 and August 2007 (Murakami et al. 2007PASJ...59S.369M) in six infrared bands between 9 um and 180 um. The AKARI/FIS All-Sky Survey Bright Source Catalogue, Version 1.0 provides positions and fluxes for 427,071 point sources observed with the Far Infrared Surveyor (FIS) instrument in the 4 far-infrared wavelengths centered at 65, 90, 140 and 160 um; the table below provides a summary of the FIS filter characteristics: <pre> Filter: N60 WIDE-S WIDE-L N160 Center(µm): 65 90 140 160 Range(µm): 50-80 60-110 110-180 140-180 Pixel("): 26.8 26.8 44.2 44.2 </pre> The users of the catalog are requested to carefully read the release note at <a href="http://www.ir.isas.jaxa.jp/AKARI/Observation/">http://www.ir.isas.jaxa.jp/AKARI/Observation/</a> before critical discussions of the data. Any questions and comments are appreciated at the ISAS Helpdesk (iris_help@ir.isas.jaxa.jp). Please acknowledge the usage of the AKARI data (details at <a href="http://www.ir.isas.jaxa.jp/AKARI/Publications/guideline.html">http://www.ir.isas.jaxa.jp/AKARI/Publications/guideline.html</a>). This table was created by the HEASARC in May 2010 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/II/298">CDS catalog II/298</a> file fis.dat. This is a service provided by NASA HEASARC .
The AKARI Infrared Astronomical Satellite observed the whole sky in the far infrared (50-180{mu}m) and the mid-infrared (9 and 18{mu}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{mu}m (see filter characteristics in the "Note (1)" section below)
The star formation properties of early-type galaxies (ETGs) are currently the subject of considerable interest, particularly whether they differ from the star formation properties of gas-rich spirals. We perform a systematic study of star formation in a large sample of local ETGs with polycyclic aromatic hydrocarbon (PAH) and dust emission, focusing on the star formation rates (SFRs) and star formation efficiencies (SFEs) of the galaxies. Our sample is composed of the 260 ETGs from the ATLAS^3D^ survey, from which we used the cold gas measurements (HI and CO). We estimated the SFRs from stellar, PAH, and dust fits to spectral energy distributions created from new AKARI measurements and with literature data from WISE and 2MASS. The mid-infrared luminosities of non-CO-detected galaxies are well correlated with their stellar luminosities, showing that they trace (circum)stellar dust emission. CO-detected galaxies show an excess above these correlations, uncorrelated with their stellar luminosities, indicating that they likely contain PAHs and dust of interstellar origin. PAH and dust luminosities of CO-detected galaxies show tight correlations with their molecular gas masses; the derived current SFRs are typically 0.01-1M_{sun}_/yr. These SFRs systematically decrease with stellar age at fixed stellar mass, while they correlate nearly linearly with stellar mass at fixed age. The majority of local ETGs follow the same star formation law as local star-forming galaxies and their current SFEs do not depend on either stellar mass or age. Our results clearly indicate that molecular gas is fueling current star formation in local ETGs, which appear to acquire this gas via mechanisms regulated primarily by stellar mass. The current SFEs of local ETGs are similar to those of local star-forming galaxies, indicating that their low SFRs are likely due to smaller cold gas fractions rather than a suppression of star formation.
The AKARI, a Japanese infrared space mission, has performed an All-Sky Survey in six infrared-bands from 9 to 180um with higher spatial resolutions and better sensitivities than the Infrared Astronomical Satellite (IRAS). We investigate the mid-infrared (9 and 18um) point source catalog (PSC) obtained with the Infrared Camera (IRC) onboard AKARI, in order to understand the infrared nature of the known objects and to identify previously unknown objects. Color-color diagrams and a color-magnitude diagram were plotted with the AKARI-IRC PSC and other available all-sky survey catalogs. We combined the Hipparcos astrometric catalog and the 2MASS all-sky survey catalog with the AKARI-IRC PSC. We furthermore searched literature and SIMBAD astronomical database for object types, spectral types, and luminosity classes. We identified the locations of representative stars and objects on the color-magnitude and color-color diagram schemes. The properties of unclassified sources can be inferred from their locations on these diagrams.
AKARI/IRC All-Sky Survey Point Source Catalog, Version 1
Short Name:
AKARIPSC
Date:
14 Feb 2025
Publisher:
NASA/GSFC HEASARC
Description:
The AKARI Infrared Astronomical Satellite observed the whole sky in the far-infrared (50-180 microns or um) and the mid-infrared (9 and 18 um) between May 2006 and August 2007 (Murakami et al. 2007PASJ...59S.369M) in six infrared bands between 9 um and 180 um. The AKARI/IRC Point Source Catalogue, Version 1.0 provides positions and fluxes for 870,973 sources observed with the InfraRed Camera (IRC): 844,649 sources in the S9W filter, and 194,551 sources in the L18W filter; the table below provides a summary of the IRC filter characteristics: <pre> Filter: S9W L18W Center(µm): 9 18 Width(µm): 4.10 9.97 Range(µm): 6.7-11.6 13.9-25.6 Pixel("): 9.4x9.4 10.4x9.4 Limit(mJy): 50 120 [at 5{sigma}] </pre> The users of the catalog are requested to carefully read the release note at <a href="http://www.ir.isas.jaxa.jp/AKARI/Observation/">http://www.ir.isas.jaxa.jp/AKARI/Observation/</a> before critical discussions of the data. Any questions and comments are appreciated at ISAS Helpdesk (iris_help@ir.isas.jaxa.jp) Please acknowledge the usage of the AKARI data (details at <a href="http://www.ir.isas.jaxa.jp/AKARI/Publications/guideline.html">http://www.ir.isas.jaxa.jp/AKARI/Publications/guideline.html</a>). This table was created by the HEASARC in May 2010 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/II/297">CDS catalog II/297</a> file irc.dat. This is a service provided by NASA HEASARC .
The AKARI Infrared Astronomical Satellite observed the whole sky in the far infrared (50-180{mu}m) and the mid-infrared (9 and 18{mu}m) between May 2006 and August 2007 (Murakami et al. 2007PASJ...59S.369M) The AKARI/IRC Point Source Catalogue Version 1.0 provides positions and fluxes for 870,973 sources observed with the InfraRed Camera (IRC): 844,649 sources in the S9W filter, and 194,551 sources in the L18W filter; the "Note (1)" section below provides a summary of the IRC filter characteristics.
The AKARI/IRC Point Source Catalogue Version 1.0 provides positions and fluxes of 870,973 sources (844,649 sources in 9 micron band and 194,551 sources in 18 micron band) in the Mid-Infrared wavelengths.
The IRC scanned 96 / 97 percent of the entire sky in 9 / 18 micron band twice or more during the 16 months of the cryogenic mission phase. The Point Source Catalogue is the primary catalogue from the AKARI IRC survey. The catalogue is designed to have a uniform detection limit over the entire sky, based on the uniform source detection limit per scan observation. Redundant observations are used to increase the reliability of the detection.
![To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to the catalogue of astrometric microlensing events. For details, see the `Creative Commons CC0 1.0 Public Domain dedication <http://creativecommons.org/publicdomain/zero/1.0/>`_. Of course, you should still give proper credit when using this data as required by good scientific practice. .. image:: /static/img/cc0.png :alt: [CC0]](/registry-search/?f%5BcapabilityType_facet%5D%5B%5D=Simple+Cone+Search&f%5Brights_facet%5D%5B%5D=To+the+extent+possible+under+law%2C+the+publisher+has+waived+all+copyright+and+related+or+neighboring+rights+to+the+catalogue+of+astrometric+++microlensing+events.++For+details%2C+see+the+%60Creative+Commons+CC0+1.0+Public+Domain+dedication+%3Chttp%3A%2F%2Fcreativecommons.org%2Fpublicdomain%2Fzero%2F1.0%2F%3E%60_.++Of+course%2C+you+should+still+give+proper+credit+when+using+this+data+as+required+by+good+scientific+practice.%0A%0A..+image%3A%3A+%2Fstatic%2Fimg%2Fcc0.png%0A+++%3Aalt%3A+%5BCC0%5D%0A%0A&f%5BvalidationLevel_facet%5D%5B%5D=2){kind=link}