ACDS V10.0 - Wed Apr 19 14:11:41 CEST 2023
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Detailed Description of V/114 :
MSX6C Infrared Point Source Catalog (Egan+ 2003)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
V/114 MSX6C Infrared Point Source Catalog (Egan+ 2003)
================================================================================
The Midcourse Space Experiment Point Source Catalog Version 2.3 (October 2003)
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)>
=2003yCat.5114....0E
================================================================================
ADC_Keywords: Infrared sources; Photometry, infrared; Surveys
Mission_Name: MSX
Description:
Version 2.3 of the Midcourse Space Experiment (MSX) Point Source
Catalog (PSC), which supersedes the version (1.2) that was released
in 1999 (Cat. V/107), contains over 100,000 more sources than the
previous version. 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. In addition to the Galactic
plane, Areas Missed by the Infrared Astronomical Satellite (IRAS), and
the Large Magellanic Cloud, which were included in the previous
catalog, Version 2.3 includes data from the Small Magellanic Cloud,
eight nearby galaxies, and several molecular clouds and star forming
regions.
The infrared instrument on MSX was named SPIRIT III; it was a 35cm
clear aperture off-axis telescope with five line scanned infrared
focal plane arrays of 18.3arcsec square pixels, with a high
sensitivity (0.1Jy at 8.3micron). The 6 bands are B1 (4.29micron, FWHM
4.22-4.36micron), B2 (4.25micron, 4.24-4.45micron), A (8.28micron,
6.8-10.8micron), C (12.13micron, 11.1-13.2micron), D (14.65micron,
13.5-15.9micron), and E (21.34micron, 18.2-25.1micron).
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. (Names in the minicatalogs may differ
slightly from those given in Kraemer et al. 2002AJ....124.2990K,
2003AJ....126.1423K)
For ease of handling, the main catalog is broken into six files: five
for the Galactic plane survey, plus the primary high latitude regions
(the IRAS gaps and the LMC). The supplementary catalogs are the
singleton catalog, the low-reliability catalog, and minicatalogs for
19 selected regions. All catalogs have the same format. However, the
minicatalogs for the galaxies (except the SMC) and Orion do not have
all the fields filled in because they were solely created from the
images, not from the Point Source Extractor; there are no singleton
files for these regions. Also, the minicatalogs may not have singleton
or low-reliability counterparts if no sources met the inclusion
criteria. All told, there are a total of 45 data files.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× guide.ps 120 96061 Explanatory Guide
× gp_m2m6.dat 354 76926 Galactic plane, -6. <= b < -2
× gp_m05m2.dat 354 92116 Galactic plane, -2. <= b < -0.5
× gp_pm05.dat 354 107309 Galactic plane, |b|<= 0.5
× gp_p05p2.dat 354 86579 Galactic plane, 0.5< b <= 2
× gp_p2p6.dat 354 68781 Galactic plane, 2. < b <= 6
× gb_gt6.dat 354 8776 High latitude, |b|> 6
× mainl.dat 354 75644 Main low reliability sources (1)
× mains.dat 354 12179 Sources with only 1 sighting (2)
× g159-18.dat 354 133 G159.6-18.5
× g159-18l.dat 354 20 G159.6-18.5 low reliability sources (1)
× g159-18s.dat 354 19 G159.6-18.5 singletons (2)
× g300-16.dat 354 99 G300.2-16.80
× g300-16l.dat 354 89 G300.2-16.80 low reliability sources (1)
× m101.dat 354 9 M101
× m101l.dat 354 6 M101 low reliability sources (1)
× m31.dat 354 84 M31
× m31l.dat 354 15 M31 low reliability sources (1)
× m33.dat 354 51 M33
× m33l.dat 354 1 M33 low reliability sources (1)
× m83.dat 354 40 M83
× m83l.dat 354 12 M83 low reliability sources (1)
× bg160.dat 354 44 MSXBG160 and MSXBG161
× bg160l.dat 354 7 MSXBG160 and MSXBG161 low reliability sources (1)
× bg160s.dat 354 5 MSXBG160 and MSXBG161 singletons (2)
× bg239.dat 354 35 MSXBG239
× bg239s.dat 354 4 MSXBG239 singletons (2)
× ngc253.dat 354 36 NGC253
× ngc4631.dat 354 3 NGC4631
× ngc4631l.dat 354 2 NGC4631 low reliability sources (1)
× ngc4945.dat 354 43 NGC4945
× ngc4945l.dat 354 13 NGC4945 low reliability sources (1)
× ngc5055.dat 354 2 NGC5055
× ngc5055l.dat 354 2 NGC5055 low reliability sources (1)
× orion.dat 354 426 Orion
× orionl.dat 354 31 Orion low reliability sources (1)
× pleiade.dat 354 71 the Pleiades
× pleiadel.dat 354 34 the Pleiades low reliability sources (1)
× pleiades.dat 354 2 the Pleiades singletons (2)
× s263.dat 354 65 S263
× s263l.dat 354 33 S263 low reliability sources (1)
× s263s.dat 354 3 S263 singletons (2)
× smc.dat 354 243 the SMC
× smcl.dat 354 64 the SMC low reliability sources (1)
× tau.dat 354 8 Taurus (2)
× taul.dat 354 20 Taurus low reliability sources (1)
Note (1): Low reliability sources have an image-based signal to noise
ratio between 3 and 5.
Note (2): Singleton sources were extracted from a single scan, but satisfied the
flux quality criteria required for catalog acceptance.
Remarks about the data files:
The catalog files are in ASCII format with entries as given in Table
11 of the Explanatory Guide. The columns are space delimited (except
for the variability, confusion, and measurement reliability flags,
which are each given as a block), and were written out using the
following FORTRAN format statement:
2002 format(a23,1x,f9.4,1x,f9.4,2(1x,f4.1),1x,f5.1,1x,i3,
6(1x,1pe12.4,i2,1x,0pf5.1,1x,f6.1,1x,f6.1,1x,i3,1x,f5.1),
1x,6i1,1x,6i1,1x,6i1)
Byte-by-byte Description of file: *.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [MSX6C]
7- 23 A17 --- MSX6C Name (based on galactic position)
26- 33 F8.4 deg RAdeg Right Ascension J2000
36- 43 F8.4 deg DEdeg Declination J2000
45- 48 F4.1 arcsec ePos 1-sigma in-scan position uncertainty
50- 53 F4.1 arcsec xPos 1-sigma cross-scan position uncertainty
55- 59 F5.1 deg posPA in-scan position angle East of North
61- 63 I3 --- Nscan Number of total scan sightings
65- 76 E12.4 Jy B1 Flux density in B1 (4.29um) band (1)
78 I1 --- q_B1 [0,4] Band B1 quality (2)
80- 84 F5.1 % e_B1 ?=-99.0 flux uncertainty 1-sigma
86- 91 F6.1 --- B1SNim Band B1 image extraction SNR (3)
93- 98 F6.1 --- B1SNpsx Band B1 point source extractor SNR
100-102 I3 --- o_B1 ?=-1 Number of sightings in Band B1
104-108 F5.1 --- B1var Variation in Band B1 measurements
110-121 E12.4 Jy B2 Flux density in B2 (4.35um) band (1)
123 I1 --- q_B2 [0,4] Band B2 quality (2)
125-129 F5.1 % e_B2 ?=-99.0 flux uncertainty 1-sigma
131-136 F6.1 --- B2SNim Band B2 image extraction SNR (3)
138-143 F6.1 --- B2SNpsx Band B2 point source extractor SNR
145-147 I3 --- o_B2 ?=-1 Number of sightings in Band B2
149-153 F5.1 --- B2var Variation in Band B2 measurements
155-166 E12.4 Jy A Flux density in A (8.28um) band (1)
168 I1 --- q_A [0,4] Band A quality (2)
170-174 F5.1 % e_A ?=-99.0 flux uncertainty 1-sigma
176-181 F6.1 --- ASNim Band A image extraction SNR (3)
183-188 F6.1 --- ASNpsx Band A point source extractor SNR
190-192 I3 --- o_A ?=-1 Number of sightings in Band A
194-198 F5.1 --- Avar Variation in Band A measurements
200-211 E12.4 Jy C Flux density in C (12.13um) band (1)
213 I1 --- q_C [0,4] Band C quality (2)
215-219 F5.1 % e_C ?=-99.0 flux uncertainty 1-sigma
221-226 F6.1 --- CSNim Band C image extraction SNR (3)
228-233 F6.1 --- CSNpsx Band C point source extractor SNR
235-237 I3 --- o_C ?=-1 Number of sightings in Band C
239-243 F5.1 --- Cvar Variation in Band C measurements
245-256 E12.4 Jy D Flux density in D (14.65um) band (1)
258 I1 --- q_D [0,4] Band D quality (2)
260-264 F5.1 % e_D ?=-99.0 flux uncertainty 1-sigma
266-271 F6.1 --- DSNim Band D image extraction SNR (3)
273-278 F6.1 --- DSNpsx Band D point source extractor SNR
280-282 I3 --- o_D ?=-1 Number of sightings in Band D
284-288 F5.1 --- Dvar Variation in Band D measurements
290-301 E12.4 Jy E Flux density in E (21.34um) band (1)
303 I1 --- q_E [0,4] Band E quality (2)
305-309 F5.1 % e_E ?=-99.0 flux uncertainty 1-sigma
311-316 F6.1 --- ESNim Band E image extraction SNR (3)
318-323 F6.1 --- ESNpsx Band E point source extractor SNR
325-327 I3 --- o_E ?=-1 Number of sightings in Band E
329-333 F5.1 --- Evar Variation in Band E measurements
335 I1 --- varB1 [0,1] Band B1 variability flag (4)
336 I1 --- varB2 [0,1] Band B2 variability flag (4)
337 I1 --- varA [0,1] Band A variability flag (4)
338 I1 --- varC [0,1] Band C variability flag (4)
339 I1 --- varD [0,1] Band D variability flag (4)
340 I1 --- varE [0,1] Band E variability flag (4)
342 I1 --- confB1 [0,1] Band B1 confusion flag
343 I1 --- confB2 [0,1] Band B2 confusion flag
344 I1 --- confA [0,1] Band A confusion flag
345 I1 --- confC [0,1] Band C confusion flag
346 I1 --- confD [0,1] Band D confusion flag
347 I1 --- confE [0,1] Band E confusion flag
349 I1 --- relB1 Band B1 measurement reliability flag (5)
350 I1 --- relB2 Band B2 measurement reliability flag (5)
351 I1 --- relA Band A measurement reliability flag (5)
352 I1 --- relC Band C measurement reliability flag (5)
353 I1 --- relD Band D measurement reliability flag (5)
354 I1 --- relE Band E measurement reliability flag (5)
Note (1): fluxes in the infrared bands:
The filter characteristics are (wavelengths in µm):
----------------------------
Band Center FWHM Points
----------------------------
B1 4.29 4.22 - 4.36
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
----------------------------
When the number of sightings is zero, the fluxes are set to the
negative value of the sensitivity limit.
Note (2): The Quality flags in each band are:
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
Note (3): SNim can take on a value of -800 if no image plate exists at the
source location and -999 if the image-based PRF fitting was unable to
extract a positive irradiance value. In these cases, we default to the
SNpsx to set the flux quality flag.
Note (4): the variability flag is set to 1 when the variation of the
measurements over the mission exceeds the 3{sigma} limit. The confusion
flag is set to 1 if there is a potential confusion issue.
Note (5): a value of 0 means that the measurements fit the point source
function and that all measurements were of adequate signal-to-noise.
A value of R=9 is assigned when the source is not detected in the band.
History:
The files, were kindy supplied by Dr Kathleen Kraemer in November 2003
================================================================================
(End) Francois Ochsenbein [CDS] 11-Dec-2003