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MSXPSC - Midcourse Space Experiment (MSX) Point Source Catalog, V2.3

HEASARC
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Overview

This table contains the main catalog from Version 2.3 of the Midcourse Space Experiment (MSX) Point Source Catalog (PSC), which supersedes the previous version (1.2) that was released in 1999, and contains 100,000 more sources than the latter. The MSX PSC main catalog used to create this Browse table contains all the sources found in the Galactic Plane survey, and the primary high-latitude regions (the IRAS gaps regions, and the Large Magellanic Cloud). Note that this HEASARC table does not contain the MSX PSC supplementary catalogs, viz. the singleton catalog, the low-reliability catalog, or the minicatalogs for 19 selected regions.

The principal objective of the astronomy experiments onboard the MSX satellite was to complete the census of the mid-infrared (4.2-25 micron or um) sky: namely, the areas missed by the IRAS mission (about 4% of the sky was not surveyed by IRAS), and the Galactic Plane (where the sensitivity of IRAS was degraded by confusion noise in regions of high source densities or of structured extended emission). The photometry is based on co-added image plates, as opposed to single-scan data, which results in improved sensitivity and hence reliability in the fluxes. Comparison with Tycho-2 positions indicates that the astrometric accuracy of the new catalog is more than 1" better than that in Version 1.2.

The infrared instrument on MSX was named SPIRIT III; it was a 35-cm clear aperture off-axis telescope with five line scanned infrared focal-plane arrays of 18.3 arcseconds square pixels, with a high sensitivity (0.1 Jy at 8.3 um). The filter characteristics of the 6 spectral bands B1, B2, A, C, D and E are summarized below, where all wavelengths are in micron (um):

         Band  Center   FWHM Points
         ----------------------------
         B1    4.29 um  4.22 - 4.36 um
         B2    4.35     4.24 - 4.45
         A     8.28     6.8  - 10.8
         C    12.13     11.1 - 13.2
         D    14.65     13.5 - 15.9
         E    21.34     18.2 - 25.1

The MSX catalog names of the sources have been defined according to International Astronomical Union (IAU) conventions with a unique identifier combined with the position of the source. In this case, the MSX PSC V2.3 sources are named using the convention MSX6C GLLL.llll+/-BB.bbbb, where MSX6C denotes that this is MSX data run using Version 6.0 of the CONVERT software, and GLLL.llll+/-BB.bbbb gives the Galactic coordinates of the source.


Catalog Bibcode

<V/114/*.dat.gz>

References

The Midcourse Space Experiment Point Source Catalog Version 2.3 (October 2003)
Explanatory Guide
     Egan M.P., Price S.D., Kraemer K.E., Mizuno D.R., Carey S.J., Wright C.O.,
     Engelke C.W., Cohen M., Gugliotti G. M.
    <Air Force Research Laboratory Technical Report AFRL-VS-TR-2003-1589 (2003)>

Midcourse Space Experiment Survey of the Galactic Plane
     Price, S.D., Egan, M.P., Carey, S.J., Mizuno, D.R., Kuchar, T.A>
    <Astron. J. 121, 2819 (2001)>
The explanatory guide is also available at the CDS: ftp://cdsarc.u-strasbg.fr/pub/cats/V/114/guide.ps.gz

Provenance

This database table was first created by the HEASARC in November 2002 and then updated in April 2005, based on the 11-Dec-2003 version of the CDS Catalog V/114 (specifically, the files gb_gt6.dat, gp_m05m2.dat, gp_m2m6.dat, gp_p05p2.dat, gp_p2p6.dat, and gp_pm05.dat which comprise the main catalog).

Parameters

Name
The MSX PSC Catalog designation, based on the galactic position of the infrared source and using the prefix 'MSX6C ' as explained in the Overview section.

RA
The Right Ascension of the infrared source in the selected equinox. This was given in J2000 degrees and with a precision of 0.0001 degrees in the original CDS tables.

Dec
The Declination of the infrared source in the selected equinox. This was given in J2000 degrees and with a precision of 0.0001 degrees in the original CDS tables.

LII
The Galactic Longitude of the infrared source.

BII
The Galactic Latitude of the infrared source.

Pos_Error_Scan
The 1-sigma positional uncertainty in the in-scan direction, in arcseconds.

Pos_Error_Cross
The 1-sigma positional uncertainty in the cross-scan direction, in arcseconds.

Scan_Pos_Angle
The position angle of the in-scan direction, using the usual convention increasing from 0 as the angle rotates East from the North direction, in degrees.

Num_Scan_Sights
The number of total scan sightings.

Flux_4p29um
The flux density in the MSX B1 band centered on 4.29 um, in Janskies (Jy). When the number of sightings in this band was zero, the flux densities were set to the negative value of the sensitivity limit.

Quality_Flag_4p29um
The quality flag for the B1 band according to the following rubric, where SNim and SNpsx are the image extraction and point source extractor signal-to-noise ratios for the source in this band:

       4 = excellent, SNim >= 10.0
       3 = good,      7.0  <= SNim < 10.0
                   or SNim  = -800 and SNpsx >= 10.0
       2 = fair,      5.0  <= SNim < 7.0
                   or SNim  = -800 and 5.0 <= SNpsx < 10.0
       1 = limit,     SNim < 5.0
       0 = not detected
  

Flux_4p29um_Pcerr
The 1-sigma uncertainty in the flux density in the B1 band, expressed as a percentage of the flux density. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Imgext_SNR_4p29um
The signal-to-noise ratio (SNR) of the source in the B1 band for the image-based photometry method. This can take on a value of -800 if no image plate exists at the source location and of -999 if the image-based point response function (PRF) fitting was unable to extract a positive irradiance value. In these cases, the catalog authors defaulted to the point source extractor (PSX) SNR for source in this band in order to set the flux quality flag.

Ptsrcext_SNR_4p29um
The signal-to-noise ratio (SNR) of the source in the B1 band for the point source extractor (PSX) method.

Num_Sights_4p29um
The number of sightings of the infrared source in the B1 band.

Variation_4p29um
The (dimensionless) variation in the B1 band measurements of the source. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Flux_4p35um
The flux density in the MSX B2 band centered on 4.35 um, in Janskies (Jy). When the number of sightings in this band was zero, the flux densities were set to the negative value of the sensitivity limit.

Quality_Flag_4p35um
The quality flag for the B2 band according to the following rubric, where SNim and SNpsx are the image extraction and point source extractor signal-to-noise ratios for the source in this band:

       4 = excellent, SNim >= 10.0
       3 = good,      7.0  <= SNim < 10.0
                   or SNim  = -800 and SNpsx >= 10.0
       2 = fair,      5.0  <= SNim < 7.0
                   or SNim  = -800 and 5.0 <= SNpsx < 10.0
       1 = limit,     SNim < 5.0
       0 = not detected
  

Flux_4p35um_Pcerr
The 1-sigma uncertainty in the flux density in the B2 band, expressed as a percentage of the flux density. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Imgext_SNR_4p35um
The signal-to-noise ratio (SNR) of the source in the B2 band for the image-based photometry method. This can take on a value of -800 if no image plate exists at the source location and of -999 if the image-based point response function (PRF) fitting was unable to extract a positive irradiance value. In these cases, the catalog authors defaulted to the point source extractor (PSX) SNR for source in this band in order to set the flux quality flag.

Ptsrcext_SNR_4p35um
The signal-to-noise ratio (SNR) of the source in the B2 band for the point source extractor (PSX) method.

Num_Sights_4p35um
The number of sightings of the infrared source in the B2 band.

Variation_4p35um
The (dimensionless) variation in the B2 band measurements of the source. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Flux_8um
The flux density in the MSX A band centered on 8.28 um, in Janskies (Jy). When the number of sightings in this band was zero, the flux densities were set to the negative value of the sensitivity limit.

Quality_Flag_8um
The quality flag for the A band according to the following rubric, where SNim and SNpsx are the image extraction and point source extractor signal-to-noise ratios for the source in this band:

       4 = excellent, SNim >= 10.0
       3 = good,      7.0  <= SNim < 10.0
                   or SNim  = -800 and SNpsx >= 10.0
       2 = fair,      5.0  <= SNim < 7.0
                   or SNim  = -800 and 5.0 <= SNpsx < 10.0
       1 = limit,     SNim < 5.0
       0 = not detected
  

Flux_8um_Pcerr
The 1-sigma uncertainty in the flux density in the A band, expressed as a percentage of the flux density. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Imgext_SNR_8um
The signal-to-noise ratio (SNR) of the source in the A band for the image-based photometry method. This can take on a value of -800 if no image plate exists at the source location and of -999 if the image-based point response function (PRF) fitting was unable to extract a positive irradiance value. In these cases, the catalog authors defaulted to the point source extractor (PSX) SNR for source in this band in order to set the flux quality flag.

Ptsrcext_SNR_8um
The signal-to-noise ratio (SNR) of the source in the A band for the point source extractor (PSX) method.

Num_Sights_8um
The number of sightings of the infrared source in the A band.

Variation_8um
The (dimensionless) variation in the A band measurements of the source. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Flux_12um
The flux density in the MSX C band centered on 12.13 um, in Janskies (Jy). When the number of sightings in this band was zero, the flux densities were set to the negative value of the sensitivity limit.

Quality_Flag_12um
The quality flag for the C band according to the following rubric, where SNim and SNpsx are the image extraction and point source extractor signal-to-noise ratios for the source in this band:

       4 = excellent, SNim >= 10.0
       3 = good,      7.0  <= SNim < 10.0
                   or SNim  = -800 and SNpsx >= 10.0
       2 = fair,      5.0  <= SNim < 7.0
                   or SNim  = -800 and 5.0 <= SNpsx < 10.0
       1 = limit,     SNim < 5.0
       0 = not detected
  

Flux_12um_Pcerr
The 1-sigma uncertainty in the flux density in the C band, expressed as a percentage of the flux density. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Imgext_SNR_12um
The signal-to-noise ratio (SNR) of the source in the C band for the image-based photometry method. This can take on a value of -800 if no image plate exists at the source location and of -999 if the image-based point response function (PRF) fitting was unable to extract a positive irradiance value. In these cases, the catalog authors defaulted to the point source extractor (PSX) SNR for source in this band in order to set the flux quality flag.

Ptsrcext_SNR_12um
The signal-to-noise ratio (SNR) of the source in the C band for the point source extractor (PSX) method.

Num_Sights_12um
The number of sightings of the infrared source in the C band.

Variation_12um
The (dimensionless) variation in the C band measurements of the source. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Flux_15um
The flux density in the MSX D band centered on 14.65 um, in Janskies (Jy). When the number of sightings in this band was zero, the flux densities were set to the negative value of the sensitivity limit.

Quality_Flag_15um
The quality flag for the D band according to the following rubric, where SNim and SNpsx are the image extraction and point source extractor signal-to-noise ratios for the source in this band:

       4 = excellent, SNim >= 10.0
       3 = good,      7.0  <= SNim < 10.0
                   or SNim  = -800 and SNpsx >= 10.0
       2 = fair,      5.0  <= SNim < 7.0
                   or SNim  = -800 and 5.0 <= SNpsx < 10.0
       1 = limit,     SNim < 5.0
       0 = not detected
  

Flux_15um_Pcerr
The 1-sigma uncertainty in the flux density in the D band, expressed as a percentage of the flux density. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Imgext_SNR_15um
The signal-to-noise ratio (SNR) of the source in the D band for the image-based photometry method. This can take on a value of -800 if no image plate exists at the source location and of -999 if the image-based point response function (PRF) fitting was unable to extract a positive irradiance value. In these cases, the catalog authors defaulted to the point source extractor (PSX) SNR for source in this band in order to set the flux quality flag.

Ptsrcext_SNR_15um
The signal-to-noise ratio (SNR) of the source in the D band for the point source extractor (PSX) method.

Num_Sights_15um
The number of sightings of the infrared source in the D band.

Variation_15um
The (dimensionless) variation in the D band measurements of the source. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Flux_21um
The flux density in the MSX E band centered on 21.34 um, in Janskies (Jy). When the number of sightings in this band was zero, the flux densities were set to the negative value of the sensitivity limit.

Quality_Flag_21um
The quality flag for the E band according to the following rubric, where SNim and SNpsx are the image extraction and point source extractor signal-to-noise ratios for the source in this band:

       4 = excellent, SNim >= 10.0
       3 = good,      7.0  <= SNim < 10.0
                   or SNim  = -800 and SNpsx >= 10.0
       2 = fair,      5.0  <= SNim < 7.0
                   or SNim  = -800 and 5.0 <= SNpsx < 10.0
       1 = limit,     SNim < 5.0
       0 = not detected
  

Flux_21um_Pcerr
The 1-sigma uncertainty in the flux density in the E band, expressed as a percentage of the flux density. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Imgext_SNR_21um
The signal-to-noise ratio (SNR) of the source in the E band for the image-based photometry method. This can take on a value of -800 if no image plate exists at the source location and of -999 if the image-based point response function (PRF) fitting was unable to extract a positive irradiance value. In these cases, the catalog authors defaulted to the point source extractor (PSX) SNR for source in this band in order to set the flux quality flag.

Ptsrcext_SNR_21um
The signal-to-noise ratio (SNR) of the source in the E band for the point source extractor (PSX) method.

Num_Sights_21um
The number of sightings of the infrared source in the E band.

Variation_21um
The (dimensionless) variation in the E band measurements of the source. If the source was not detected in this band, i.e., the corresponding quality flag has a value of 0, this parameter is set to -99.0.

Var_Flag_4p29um
The B1 band variability flag: this flag is set to 1 when the variation of the measurements over the mission exceeds the 3-sigma limit, compared to a default value of 0.

Var_Flag_4p35um
The B2 band variability flag: this flag is set to 1 when the variation of the measurements over the mission exceeds the 3-sigma limit, compared to a default value of 0.

Var_Flag_8um
The A band variability flag: this flag is set to 1 when the variation of the measurements over the mission exceeds the 3-sigma limit, compared to a default value of 0.

Var_Flag_12um
The C band variability flag: this flag is set to 1 when the variation of the measurements over the mission exceeds the 3-sigma limit, compared to a default value of 0.

Var_Flag_15um
The D band variability flag: this flag is set to 1 when the variation of the measurements over the mission exceeds the 3-sigma limit, compared to a default value of 0.

Var_Flag_21um
The E band variability flag: this flag is set to 1 when the variation of the measurements over the mission exceeds the 3-sigma limit, compared to a default value of 0.

Conf_Flag_4p29um
The B1 band confusion flag: this flag is set to 1 when there is a possible confusion problem, compared to a default (not confused) value of 0.

Conf_Flag_4p35um
The B2 band confusion flag: this flag is set to 1 when there is a possible confusion problem, compared to a default (not confused) value of 0.

Conf_Flag_8um
The A band confusion flag: this flag is set to 1 when there is a possible confusion problem, compared to a default (not confused) value of 0.

Conf_Flag_12um
The C band confusion flag: this flag is set to 1 when there is a possible confusion problem, compared to a default (not confused) value of 0.

Conf_Flag_15um
The D band confusion flag: this flag is set to 1 when there is a possible confusion problem, compared to a default (not confused) value of 0.

Conf_Flag_21um
The E band confusion flag: this flag is set to 1 when there is a possible confusion problem, compared to a default (not confused) value of 0.

Rel_Flag_4p29um
The B1 band measurement reliability flag, being a measure of SNR and fit quality. This flag is set to 9 if the source was not detected in this band, else it is the sum of I(psf) and I(snr), where I(psf) is 0 there is a good fit to the point spread function (PSF) for all measurements, 1 if there is a good fit for some but not all measurements, and 2 if there is a poor fit for all measurements; and I(snr) is 0 if all measurements have an SNR > 3, 3 if the lowest-SNR measurement is < 3, and 6 if all measurements have an SNR < 3. Notice that these latter values of this flag thus uniquely fill the range from 0 to 8, and that the individual values of I(psf) and I(snr) can thus be reconstructed by the user: e.g., a value of 5 for this flag implies that I(psf) = 2 and I(snr) = 3.

Rel_Flag_4p35um
The B2 band measurement reliability flag, being a measure of SNR and fit quality. This flag is set to 9 if the source was not detected in this band, else it is the sum of I(psf) and I(snr), where I(psf) is 0 there is a good fit to the point spread function (PSF) for all measurements, 1 if there is a good fit for some but not all measurements, and 2 if there is a poor fit for all measurements; and I(snr) is 0 if all measurements have an SNR > 3, 3 if the lowest-SNR measurement is < 3, and 6 if all measurements have an SNR < 3. Notice that these latter values of this flag thus uniquely fill the range from 0 to 8, and that the individual values of I(psf) and I(snr) can thus be reconstructed by the user: e.g., a value of 5 for this flag implies that I(psf) = 2 and I(snr) = 3.

Rel_Flag_8um
The A band measurement reliability flag, being a measure of SNR and fit quality. This flag is set to 9 if the source was not detected in this band, else it is the sum of I(psf) and I(snr), where I(psf) is 0 there is a good fit to the point spread function (PSF) for all measurements, 1 if there is a good fit for some but not all measurements, and 2 if there is a poor fit for all measurements; and I(snr) is 0 if all measurements have an SNR > 3, 3 if the lowest-SNR measurement is < 3, and 6 if all measurements have an SNR < 3. Notice that these latter values of this flag thus uniquely fill the range from 0 to 8, and that the individual values of I(psf) and I(snr) can thus be reconstructed by the user: e.g., a value of 5 for this flag implies that I(psf) = 2 and I(snr) = 3.

Rel_Flag_12um
The C band measurement reliability flag, being a measure of SNR and fit quality. This flag is set to 9 if the source was not detected in this band, else it is the sum of I(psf) and I(snr), where I(psf) is 0 there is a good fit to the point spread function (PSF) for all measurements, 1 if there is a good fit for some but not all measurements, and 2 if there is a poor fit for all measurements; and I(snr) is 0 if all measurements have an SNR > 3, 3 if the lowest-SNR measurement is < 3, and 6 if all measurements have an SNR < 3. Notice that these latter values of this flag thus uniquely fill the range from 0 to 8, and that the individual values of I(psf) and I(snr) can thus be reconstructed by the user: e.g., a value of 5 for this flag implies that I(psf) = 2 and I(snr) = 3.

Rel_Flag_15um
The D band measurement reliability flag, being a measure of SNR and fit quality. This flag is set to 9 if the source was not detected in this band, else it is the sum of I(psf) and I(snr), where I(psf) is 0 there is a good fit to the point spread function (PSF) for all measurements, 1 if there is a good fit for some but not all measurements, and 2 if there is a poor fit for all measurements; and I(snr) is 0 if all measurements have an SNR > 3, 3 if the lowest-SNR measurement is < 3, and 6 if all measurements have an SNR < 3. Notice that these latter values of this flag thus uniquely fill the range from 0 to 8, and that the individual values of I(psf) and I(snr) can thus be reconstructed by the user: e.g., a value of 5 for this flag implies that I(psf) = 2 and I(snr) = 3.

Rel_Flag_21um
The E band measurement reliability flag, being a measure of SNR and fit quality. This flag is set to 9 if the source was not detected in this band, else it is the sum of I(psf) and I(snr), where I(psf) is 0 there is a good fit to the point spread function (PSF) for all measurements, 1 if there is a good fit for some but not all measurements, and 2 if there is a poor fit for all measurements; and I(snr) is 0 if all measurements have an SNR > 3, 3 if the lowest-SNR measurement is < 3, and 6 if all measurements have an SNR < 3. Notice that these latter values of this flag thus uniquely fill the range from 0 to 8, and that the individual values of I(psf) and I(snr) can thus be reconstructed by the user: e.g., a value of 5 for this flag implies that I(psf) = 2 and I(snr) = 3.


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 23-Mar-2006