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 1994JSpRo..31..900M in ADS);
Carbary et al., 1994, Applied Optics, 33, 4201 (1994ApOpt..33.4201C 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