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AKARIBSC - AKARI/FIS All-Sky Survey Bright Source Catalog, Version 1

HEASARC
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Overview

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:


         Filter:     N60    WIDE-S    WIDE-L     N160

     Center(um):     65       90       140       160
      Range(um):    50-80    60-110   110-180   140-180
       Pixel("):    26.8      26.8     44.2      44.2
The users of the catalog are requested to carefully read the release note at http://www.ir.isas.jaxa.jp/AKARI/Observation/ 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 http://www.ir.isas.jaxa.jp/AKARI/Publications/guideline.html).


Catalog Bibcode

2010yCat.2298....0Y

References

AKARI/FIS All-Sky Survey Bright Source Catalogue Version 1.0
    Yamamura I., Makiuti S., Ikeda N., Fukuda Y., Oyabu S., Koga T., White G.J.
    <ISAS/JAXA (2010)>

Provenance

This table was created by the HEASARC in May 2010 based on CDS catalog II/298 file fis.dat.

Parameters

Source_Number
The AKARI unique source number for each source in the catalog.

Name
The AKARI source designation of the form 'AKARI-FIS-V1 JHHMMSSs+DDMMSS', where the prefix stands for AKARI Far Infrared Surveyor, Version 1; thus 'AKARI-FIS-V1 J0123456+765432' is the AKARI FIS Version 1 catalog source at J2000.0 RA and Dec 01h23m45.6s, +76d54m32s.

RA
The Right Ascension of the infrared source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-5 degrees in the original source catalog.

Dec
The Declination of the infrared source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-5 degrees in the original source catalog.

LII
The Galactic Longitude of the infrared source.

BII
The Galactic Latitude of the infared source.

Flux_65_um
The source flux density in the FIS N60 filter centered at 65 um, in Janskies (Jy). Values are given even for the unconfirmed sources as much as possible, though such data values are not guaranteed. If it was not possible to measure the source flux in this band, a null value is given.

Flux_65_um_Error
The uncertainty in the 65-um source flux density, in Jy. This is evaluated as the standard deviation of the fluxes measured on the individual scans divided by the square root of the number of measurements (given by the num_scans_det_65_um parameter). Thus, this error only includes the relative uncertainty of the measurements. Details of the flux uncertainty calculation are given in Section 5.3 of the reference paper. When it was not possible to calculate the standard deviation, this parameter was set to a null value.

Flux_90_um
The source flux density in the FIS WIDE-S filter centered at 90 um, in Janskies (Jy). Values are given even for the unconfirmed sources as much as possible, though such data values are not guaranteed. If it was not possible to measure the source flux in this band, a null value is given.

Flux_90_um_Error
The uncertainty in the 90-um source flux density, in Jy. This is evaluated as the standard deviation of the fluxes measured on the individual scans divided by the square root of the number of measurements (given by the num_scans_det_90_um parameter). Thus, this error only includes the relative uncertainty of the measurements. Details of the flux uncertainty calculation are given in Section 5.3 of the reference paper. When it was not possible to calculate the standard deviation, this parameter was set to a null value.

Flux_140_um
The source flux density in the FIS WIDE-L filter centered at 140 um, in Janskies (Jy). Values are given even for the unconfirmed sources as much as possible, though such data values are not guaranteed. If it was not possible to measure the source flux in this band, a null value is given.

Flux_140_um_Error
The uncertainty in the 140-um source flux density, in Jy. This is evaluated as the standard deviation of the fluxes measured on the individual scans divided by the square root of the number of measurements (given by the num_scans_det_140_um parameter). Thus, this error only includes the relative uncertainty of the measurements. Details of the flux uncertainty calculation are given in Section 5.3 of the reference paper. When it was not possible to calculate the standard deviation, this parameter was set to a null value.

Flux_160_um
The source flux density in the FIS N160 filter centered at 160 um, in Janskies (Jy). Values are given even for the unconfirmed sources as much as possible, though such data values are not guaranteed. If it was not possible to measure the source flux in this band, a null value is given.

Flux_160_um_Error
The uncertainty in the 160-um source flux density, in Jy. This is evaluated as the standard deviation of the fluxes measured on the individual scans divided by the square root of the number of measurements (given by the num_scans_det_160_um parameter). Thus, this error only includes the relative uncertainty of the measurements. Details of the flux uncertainty calculation are given in Section 5.3 of the reference paper. When it was not possible to calculate the standard deviation, this parameter was set to a null value.

Quality_Flag_65_um
The 65-um flux density quality flag. This flag is a four-level flux quality indicator, as follows:

      3 = high quality (the source confirmed and the flux is reliable)
      2 = the source is confirmed but the flux is not reliable (see the flags)
      1 = the source is not confirmed
      0 = not observed (no scan data available)
  

Quality_Flag_90_um
The 90-um flux density quality flag. This flag is a four-level flux quality indicator, as follows:

      3 = high quality (the source confirmed and the flux is reliable)
      2 = the source is confirmed but the flux is not reliable (see the flags)
      1 = the source is not confirmed
      0 = not observed (no scan data available)
  

Quality_Flag_140_um
The 140-um flux density quality flag. This flag is a four-level flux quality indicator, as follows:

      3 = high quality (the source confirmed and the flux is reliable)
      2 = the source is confirmed but the flux is not reliable (see the flags)
      1 = the source is not confirmed
      0 = not observed (no scan data available)
  

Quality_Flag_160_um
The 160-um flux density quality flag. This flag is a four-level flux quality indicator, as follows:

      3 = high quality (the source confirmed and the flux is reliable)
      2 = the source is confirmed but the flux is not reliable (see the flags)
      1 = the source is not confirmed
      0 = not observed (no scan data available)
  

Bit_Flags_65_um
The bit flags for the 65-um (N60 band) data quality coded in hexadecimal (0-9a-f), as follows:

        1 = CDS mode used (Correlated Double Sampling used to observe
            bright sky regions to avoid saturation, e.g. in the inner
            Galactic plane)
        2 = flux too low
        4 = (not used)
        8 = possibly a 'side-lobe' detection
  
Combined values are represented by the sum of the above individual values, e.g., a value of 9 = 8 + 1 means a possible side-lobe detection in CDS mode.

Bit_Flags_90_um
The bit flags for the 90-um (WIDE-S band) data quality coded in hexadecimal (0-9a-f), as follows:

        1 = CDS mode used (Correlated Double Sampling used to observe
            bright sky regions to avoid saturation, e.g. in the inner
            Galactic plane)
        2 = flux too low
        4 = (not used)
        8 = possibly a 'side-lobe' detection
  
Combined values are represented by the sum of the above individual values, e.g., a value of 9 = 8 + 1 means a possible side-lobe detection in CDS mode.

Bit_Flags_140_um
The bit flags for the 140-um (WIDE-L band) data quality coded in hexadecimal (0-9a-f), as follows:

        1 = CDS mode used (Correlated Double Sampling used to observe
            bright sky regions to avoid saturation, e.g. in the inner
            Galactic plane)
        2 = flux too low
        4 = (not used)
        8 = possibly a 'side-lobe' detection
  
Combined values are represented by the sum of the above individual values, e.g., a value of 9 = 8 + 1 means a possible side-lobe detection in CDS mode.

Bit_Flags_160_um
The bit flags for the 160-um (N160 band) data quality coded in hexadecimal (0-9a-f), as follows:

        1 = CDS mode used (Correlated Double Sampling used to observe
            bright sky regions to avoid saturation, e.g. in the inner
            Galactic plane)
        2 = flux too low
        4 = (not used)
        8 = possibly a 'side-lobe' detection
  
Combined values are represented by the sum of the above individual values, e.g., a value of 9 = 8 + 1 means a possible side-lobe detection in CDS mode.

Num_Scans_Det_65_um
The number of scans in which the 65-um source was properly detected with logEvidence larger than the threshold.

Num_Scans_Det_90_um
The number of scans in which the 90-um source was properly detected with logEvidence larger than the threshold.

Num_Scans_Det_140_um
The number of scans in which the 140-um source was properly detected with logEvidence larger than the threshold.

Num_Scans_Det_160_um
The number of scans in which the 160-um source was properly detected with logEvidence larger than the threshold.

Num_Scans_Poss_65_um
The number of times that the 65-um source position has been scanned during the survey, i.e., that possibly observed the source.

Num_Scans_Poss_90_um
The number of times that the 90-um source position has been scanned during the survey, i.e., that possibly observed the source.

Num_Scans_Poss_140_um
The number of times that the 140-um source position has been scanned during the survey, i.e., that possibly observed the source.

Num_Scans_Poss_160_um
The number of times that the 160-um source position has been scanned during the survey, i.e., that possibly observed the source.

Month_Conf_Flag_65_um
This 'month-confirmation' flag parameter for the 65-um band is set to 1 when the source is observed in scans separated by more than one month (usually an object is visible every six months). This value is independent of 'hours confirmation' and can be 1 even if the source is not confirmed (i.e., the corresponding quality flag value in this band is 1). Because of the visibility constraints of the AKARI Survey, some sky regions were observed by scans only within a month. A value of the 'month-confirmation' flag parameter of 0 does not mean that the source is unreliable.

Month_Conf_Flag_90_um
This 'month-confirmation' flag parameter for the 90-um band is set to 1 when the source is observed in scans separated by more than one month (usually an object is visible every six months). This value is independent of 'hours confirmation' and can be 1 even if the source is not confirmed (i.e., the corresponding quality flag value in this band is 1). Because of the visibility constraints of the AKARI Survey, some sky regions were observed by scans only within a month. A value of the 'month-confirmation' flag parameter of 0 does not mean that the source is unreliable.

Month_Conf_Flag_140_um
This 'month-confirmation' flag parameter for the 140-um band is set to 1 when the source is observed in scans separated by more than one month (usually an object is visible every six months). This value is independent of 'hours confirmation' and can be 1 even if the source is not confirmed (i.e., the corresponding quality flag value in this band is 1). Because of the visibility constraints of the AKARI Survey, some sky regions were observed by scans only within a month. A value of the 'month-confirmation' flag parameter of 0 does not mean that the source is unreliable.

Month_Conf_Flag_160_um
This 'month-confirmation' flag parameter for the 160-um band is set to 1 when the source is observed in scans separated by more than one month (usually an object is visible every six months). This value is independent of 'hours confirmation' and can be 1 even if the source is not confirmed (i.e., the corresponding quality flag value in this band is 1). Because of the visibility constraints of the AKARI Survey, some sky regions were observed by scans only within a month. A value of the 'month-confirmation' flag parameter of 0 does not mean that the source is unreliable.

Num_Near_Sources
The number of sources in the catalog within 5 arcminutes distance of the source. This value is intended to be an indicator of the crowdedness of the sky region. Since the source extraction program is tuned so that a unique source is found within 48 arcseconds radius, the 5 arcminutes radius corresponds to an area of approximately 40 beams.


Contact Person

Questions regarding the AKARIBSC database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 28-Aug-2012