II/269 MSX Ultraviolet Point Source Catalog (Newcomer+, 2004)
The Midcourse Space Experiment Point Source Catalog (March 2004). Newcomer R.E., Murthy J., Henry R.C., Price S.D., Paxton L. <Air Force Research Laboratory Technical Report AFRL-VS-TR-2004-1056 (2004)>
ADC_Keywords: Ultraviolet ; Photometry, ultraviolet; Surveys Mission_Name: MSX Description: The Midcourse Space Experiment (MSX) Ultraviolet Point Source Catalog contains 47,283 point sources from a set of 201 observations that surveyed approximately half the sky and from a set of 32 pointed observations toward specific targets. For each source, we provide position, UV magnitude and uncertainty in at least one of six filters and where possible an identification of a nearby source from the SIMBAD database. If a nearby source is identified, we include its proximity to the MSX source, and if known, the spectral type and the B and V magnitudes of the SIMBAD object. There were 11,565 matches between MSX and SIMBAD objects, and we estimate false identification to be about 3%. The limiting fluxes differ from filter to filter, and range from 10-16erg/s/cm2/Å for IUN4 to 7.8*10-12erg/s/cm2/Å for IUW3. Because of variations among the observation sets, the catalog is not complete to the limiting magnitudes for the filters. The UV instrument on MSX was named UVISI (Mill et al., 1994, Journal of Spacecraft and Rockets, 31, 900 (1994JSpRo..31..900M in ADS); Carbary et al., 1994, Applied Optics, 33, 4201 (1994ApOpt..33.4201C in ADS)). The fields-of-view for the narrow-field and wide-field UV imagers were 1.46x1.19deg (detector pixels of 20.6"x17.5") and 13.4x9.2deg (detector pixels of 3.12'x2.27'), respectively. Four filters were used with the narrow-field imager (IUN) with effective wavelengths centered at 2480Å (IUN3), 2310Å (IUN4), 2230Å (IUN5), and 2930Å (IUN6). Two filters were used with the wide-field imager (IUW) and centered at 1320Å (IUW3) and 1560Å (IUW6). Two data files are available for the MSX UV Point Source Catalog: the calibration data file and the catalog data file. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file calib.dat 45 6058 Calibration data file catal.dat 146 47318 Catalog of MSX UV sources
See also: II/59 : Catalogue of stellar UV fluxes (TD1) (Thompson+ 1978) V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003) Byte-by-byte Description of file: calib.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Filter UV imager that this calibrator is valid for with filter number (1) 6- 15 A10 --- Name Star name: TD-1, HD, SAO 16- 20 A5 --- SpType MK spectral type 22- 26 F5.2 mag Vmag V magnitude (UBV system) 28- 32 F5.2 mag Bmag B magnitude (UBV system) 34- 39 F6.2 mag magm MSX measured magnitude in the filter 41- 45 F5.2 mag magp Kurucz model prediction of the magnitude
Note (1): Filters as the following bandpass: IUN3 = 230-260nm IUN4 = 180-300nm IUN5 = 200-230nm IUN6 = 260-300nm IUW3 = 128-138nm IUW4 = 110-180nm IUW6 = 145-180nm IVN3 = 350-440nm IVN5 = 305-315nm IVN6 = 470-640nm IVW3 = 529-631nm IVW4 = 380-900nm IVW5 = 426-429nm
Byte-by-byte Description of file: catal.dat
Bytes Format Units Label Explanations
1- 13 A13 --- ID Target ID in J2000 coords (HHMMSS+DDMMSS) 15- 22 A8 --- DCE Data Collection Event (Note 1) 24- 26 I3 --- RRNo ?=-99 Relative Reference No. (Note 2) 28- 33 F6.2 mag IUN3 ?=-99.00 Magnitude in IUN 3 filter (2480Å) 35- 40 F6.2 mag IUN4 ?=-99.00 Magnitude in IUN 4 filter (2310Å) 42- 47 F6.2 mag IUN5 ?=-99.00 Magnitude in IUN 5 filter (2230Å) 49- 52 A4 --- n_NUV Narrow band filter ID for NUV (IUN6 or IVN5) 54- 59 F6.2 mag NUV ?=-99.00 Magnitude in the near UV relative to the other filters 61- 64 A4 --- n_IUW Wide band filter ID for IUW (IUW3 or IUW6) 66- 71 F6.2 mag IUW ?=-99.00 Magnitude in the far UV relative to the other filters 73- 75 I3 --- RRW1 ?=-99 Rel. Ref. No. of the IUW detection (2) 77- 79 I3 --- RRN1 ?=-99 Rel. Ref. No. of the 1st IUN detection (2) 81- 83 I3 --- RRN2 ?=-99 Rel. Ref. No. of the 2nd IUN detection (2) 85- 87 I3 --- RRN3 ?=-99 Rel. Ref. No. of the 3rd IUN detection (2) 89- 91 I3 --- RRN4 ?=-99 Rel. Ref. No. of the 4th IUN detection (2) 93-120 A28 --- SimbID ? Simbad ID (2004) if available 122-126 F5.2 arcmin AngDist ? Angular distance to the Simbad object 128-133 A6 --- SpType ? MK spectral type of the Simbad object 134-139 F6.2 mag Vmag ? Vmag of the Simbad object 141-146 F6.2 mag Bmag ? Bmag of the Simbad object -------------------------------------------------------------------------------- Note (1) The Data Collection Event tag is a unique identifier for the observation. The initial two letters in the label identify the team responsible for the experiment, in this case, CB for the Celestial Background team. This is followed by numbers that define the observing profile, the first two digits of which denote the experiment number and the last three denote the specific observation.
Note (2): The Relative Reference is an integer, only assigned to sources where more than one narrow field (IUN or IVN) source corresponds to a single IUW source. These values are relative to the DCE. For example, a source in DCE CB10.100 that refers to a source with a relative reference value of 2 would correspond to only the source in CB10.100 that has a value of 2 in this column, and not to the source with a relative reference value of 2 in CB10.101. For example 061715+012248 CB11.029 has RRNo=1 and RRW1=2; the first 061728+012033 CB11.029 entry has RRNo=3 and RRN1=2, and the second 061728+012033 CB11.029 entry has RRNo=2, RRN1=3 and RRN2=1. The IUW detection was RRNo=2; both 061728+012033 CB11.029 RRNo=3 and 061715+012248 CB11.029 RRNo=1 are in the IUW PSF.
History: * 17-Jul-2006: the files, were kindly supplied by Dr Kathleen Kraemer * 29-Aug-2006: the distances to the Simbad object (column "AngDist" of file catal.dat) was recomputed at CDS, the original values looking suspect. In the course of this modification, 17 Simbad SimbIDs were removed due to a large distance, most likely due to a sign error in the interpretation of Simbad declination for IDs: 003341+001712 063054+004539 063211+005630 063754+003151 133358+001928 142557+003939 144541+002439 155701+004808 162743+004620 185855+003355 191033+004132 193004+005316 194525+001239 195040+004101 195717+001959 202844+005149 234324+000729
(End) Francois Ochsenbein [CDS] 17-Jul-2006
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