IX/1 Wisconsin soft X-ray diffuse background all-sky Survey (McCammon+ 1983)
Wisconsin Soft X-Ray Diffuse Background All-Sky Survey
McCammon D., Burrows D.N., Sanders W.T., Kraushaar W.L.
<Astrophys. J. 269, 107 (1983)>
=1983ApJ...269..107M 1983ApJ...269..107M
=1997yCat.9001....0M 1997yCat.9001....0M
ADC_Keywords: Surveys ; X-ray sources
Description:
The catalog contains all-sky survey of the soft X-ray diffuse
background and the count-rate data from which the maps were made for
the ten flights included in the survey. It contains 40 files in the
machine-readable version and includes documentation and utility
subroutines. The data files contain different band maps (B, C, M, M1,
M2, I, J, 2-6 keV) in a 0 degree-centered Aitoff projection, in a
180-degree-centered Aitoff projection, in a north polar projection,
and in a south polar projection. Lookup tables in the form of FITS
images are provided for conversion between pixel coordinates and
Galactic coordinates for the various projections.
The bands are:
B = 130-188eV
C = 160-284eV
M1 = 440-930eV
M2 = 600-1100eV
I = 770-1500eV
J = 1100-2200eV
2-6keV = 1800-6300eV
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
doc_gen.txt 80 296 General documentation for the survey
doc_rate.txt 80 186 Documentation for the countrate files (p*.dat)
programs.f 80 547 FORTRAN subroutines for accessing the original
data files
a0b.fit 2880 48 Aitoff 0°-centered, B(130-188eV) band
a0b_mask.fit 2880 48 Aitoff 0°-centered, B(130-188eV) band
(with contaminated regions defined by the
subroutine REMOVE in programs.doc zeroed)
a0c.fit 2880 48 Aitoff 0°-centered C(160-284eV)-band
a0c_mask.fit 2880 48 Aitoff 0°-centered C(160-284eV)-band
(with contaminated regions defined by the
subroutine REMOVE in programs.doc zeroed)
a0m.fit 2880 48 Aitoff 0°-centered M(440-1100eV)-band
a0m1.fit 2880 48 Aitoff 0°-centered M1(440-930eV)-band
a0m2.fit 2880 48 Aitoff 0°-centered M2(600-1100eV)-band
a0i.fit 2880 48 Aitoff 0°-centered I(770-1500eV)-band
a0j.fit 2880 48 Aitoff 0°-centered J(1100-2200eV)-band
a026.fit 2880 48 Aitoff 0°-centered 1.8-6.3keV band
a180b.fit 2880 48 Aitoff 180°-centered B(130-188eV) band
a180c.fit 2880 48 Aitoff 180°-centered C(160-284eV)-band
a180m.fit 2880 48 Aitoff 180°-centered M(440-1100eV)-band
a180m1.fit 2880 48 Aitoff 180°-centered M1(440-930eV)-band
a180m2.fit 2880 48 Aitoff 180°-centered M2(600-1100eV)-band
a180i.fit 2880 48 Aitoff 180°-centered I(770-1500eV)-band
galxy0.fit 2880 48 Aitoff 0°-centered mapping of (l,b) to pixels
galxy180.fit 2880 48 Aitoff 180°-centered mapping of (l,b) to pixels
xygal0.fit 2880 48 Aitoff 0°-centered mapping of pixels to (l,b)
xygal180.fit 2880 48 Aitoff 180°-centered mapping of pixels to (l,b)
npb.fit 2880 25 North Polar B(130-188eV) band
npc.fit 2880 25 North Polar C(160-284eV)-band
npm.fit 2880 25 North Polar M(440-1100eV)-band
npm1.fit 2880 25 North Polar M1(440-930eV)-band
npm2.fit 2880 25 North Polar M2(600-1100eV)-band
npi.fit 2880 25 North Polar I(770-1500eV)-band
spb.fit 2880 25 South Polar B(130-188eV) band
spc.fit 2880 25 South Polar C(160-284eV)-band
spm.fit 2880 25 South Polar M(440-1100eV)-band
spm1.fit 2880 25 South Polar M1(440-930eV)-band
spm2.fit 2880 25 South Polar M2(600-1100eV)-band
spi.fit 2880 25 South Polar I(770-1500eV)-band
galxy_np.fit 2880 25 Zenithal Equal Area mapping of (l,b) to
pixels for North Polar projection
galxy_sp.fit 2880 25 Zenithal Equal Area mapping of (l,b) to
pixels for South Polar projection
xygal_np.fit 2880 25 Zenithal Equal Area mapping of pixels to
(l,b) for North Polar projection
xygal_sp.fit 2880 25 Zenithal Equal Area mapping of pixels to
(l,b) for South Polar projection
effaprod.dat 80 560 Effective Area Product as a function of energy
for the different X-ray bands
p13049.dat 400 1176 Observations from flight 13.049 (PASS3)
p13083.dat 400 1186 Observations from flight 13.083 (PASS3)
p13084.dat 400 1356 Observations from flight 13.084 (PASS3)
p13102.dat 400 1211 Observations from flight 13.102 (PASS3)
p13103.dat 400 1026 Observations from flight 13.103 (PASS3)
p13122.dat 400 1296 Observations from flight 13.122 (PASS3)
p13137.dat 400 1326 Observations from flight 13.137 (PASS3)
p25045.dat 400 1401 Observations from flight 25.045 (PASS3)
p25051.dat 400 1451 Observations from flight 25.051 (PASS3)
p26061.dat 400 1245 Observations from flight 26.061 (PASS3)
maps.dat 83 36 Summary of FITS maps
--------------------------------------------------------------------------------
Byte-by-byte Description of file: effaprod.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 10 E9.4 keV E [0.0025/10.6] Photon energy
12- 20 E9.4 cm2.sr Area.B Effective area in the B(130-188eV) band
22- 30 E9.4 cm2.sr Area.C Effective area in the C(160-284eV)-band
32- 40 E9.4 cm2.sr Area.M1 Effective area in the M1(440-930eV)-band
42- 50 E9.4 cm2.sr Area.M2 Effective area in the M2(600-1100eV)-band
52- 60 E9.4 cm2.sr Area.I Effective area in the I(770-1500eV)-band
62- 70 E9.4 cm2.sr Area.J Effective area in the J(1100-2200eV)-band
72- 80 E9.4 cm2.sr Area.26 Effective area in the 1.8-6.3keV band
--------------------------------------------------------------------------------
Byte-by-byte Description of file: p*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
5- 10 F6.3 --- Flight Flight number
19- 20 I2 min time.m Minutes past the hour for the center of the
0.2s observation
26- 30 F5.2 s time.s Seconds past the minute for the center of
the 0.2s observation
35- 40 A6 --- Flag [0-7] Octal flag word (1)
41- 50 E10.4 deg GLON [0/360] Galactic longitude
51- 60 E10.4 deg GLAT [-90/90] Galactic latitude
61- 70 E10.4 deg RAdeg Right Ascension (B1950)
71- 80 E10.4 deg DEdeg Declination (B1950)
81- 90 E10.4 deg Az [0/360] Azimuth angle
91-100 E10.4 deg Ze [0/180] Zenith angle
101-110 E10.4 km Alt [95/220] Rocket altitude
111-120 E10.4 cm-2 Ncol Column density of nitrogen atoms (2)
121-130 E10.4 cm-2 Ocol Column density of oxygen atoms (2)
131-140 E10.4 cm-2 Arcol Column density of argon atoms (3)
141-150 E10.4 deg Az.B [0/360] Azimuth angle, relative to the Earth's
magnetic field
151-160 E10.4 deg Ze.B [0/180] Zenith angle, relative to the Earth's
magnetic field
161-170 E10.4 ct/s Brate ?=-99 Count rate in band B(130-188eV)
171-180 E10.4 ct/s e_Brate ?=-99 1-σ uncertainty for Brate
181-190 E10.4 --- Btrm [0/1] Atmospheric transmission for band B
191-200 E10.4 ct/s Crate ?=-99 Count rate in band C(160-284eV)
201-210 E10.4 ct/s e_Crate ?=-99 1-σ uncertainty for Crate
211-220 E10.4 --- Ctrm [0/1] Atmospheric transmission for band C
221-230 E10.4 ct/s Mrate ?=-99 Count rate in band M
231-240 E10.4 ct/s e_Mrate ?=-99 1-σ uncertainty for Mrate
241-250 E10.4 --- Mtrm [0/1] Atmospheric transmission for band M
251-260 E10.4 ct/s M1rate ?=-99 Count rate in band M1(440-930eV)
261-270 E10.4 ct/s e_M1rate ?=-99 1-σ uncertainty for M1rate
271-280 E10.4 --- M1trm [0/1] Atmospheric transmission for band M1
281-290 E10.4 ct/s M2rate ?=-99 Count rate in band M2(600-1100eV)
291-300 E10.4 ct/s e_M2rate ?=-99 1-σ uncertainty for M2rate
301-310 E10.4 --- M2trm [0/1] Atmospheric transmission for band M2
311-320 E10.4 ct/s Irate ?=-99 Count rate in band I(770-1500eV)
321-330 E10.4 ct/s e_Irate ?=-99 1-σ uncertainty for Irate
331-340 E10.4 --- Itrm [0/1] Atmospheric transmission for band I
341-350 E10.4 ct/s Jrate ?=-99 Count rate in band J(1100-2200eV)
351-360 E10.4 ct/s e_Jrate ?=-99 1-σ uncertainty for Jrate
361-370 E10.4 --- Jtrm [0/1] Atmospheric transmission for band J
371-380 E10.4 ct/s 26rate ?=-99 Count rate in band 1.8-6.3keV
381-390 E10.4 ct/s e_26rate ?=-99 1-σ uncertainty for 26rate
391-400 E10.4 --- 26trm [0/1] Atmospheric transmission for 1.8-6.3keV
--------------------------------------------------------------------------------
Note (1): these 6 characters should be interpreted as an 18-bit octal word,
with only the least significant (rightmost) 16 bits being used.
They contain the following information (bits numbered 1-16 from
left to right - most significant to least significant):
1 = set to 1 if the observation contains bad telemetry.
2 = set to 1 if there are fewer than 50 useful telemetry subframes in the
observation (each observation can contain a maximum of 125 subframes
for flights 13.083 and 13.102, or 250 for the other flights).
3 = set to 1 if the livetime correction is uncertain.
5 = set to 1 if the B and/or C-band data are definitely contaminated.
6 = set to 1 if the B and/or C-band data are possibly contaminated.
10 = set to 1 if the payload was pointed at the Earth.
11 = set to 1 if a B and/or C-band source was in the field of view. These are!
HZ43, Am Her, the Cygnus Loop, Vela-Puppis SNR's, Sco X-1, and U Gem.
12 = set to 1 if the M and/or I-band data show evidence for the presence
of a source in the field of view.
13 = set to 1 if the J-and/or 2-6keV band data show evidence for the
presence of a source in the field of view.
14 = set to 1 if the following sources are in the field of view:
sources listed in the 4-th Uhuru catalog (4U) with ≥20ct/s;
Vela-Puppis SNR's; Cygnus Loop.
Example: The flag word of the first record of file 31 (13.083) is written
as: 004000, indicating that bit 5 is set because the B and C-band data
for that observation are known to be contaminated.
Note that records were not cast onto the maps if the following flags
were set:
* For the B and C-bands: 1, 2, 3, 5, 10, 11
* For the M1-through 2-6keV bands: 1, 2, 3, 10, 14
Note (2): number of atoms along the line of sight in the atmosphere,
equals twice the number of molecules per cm2 calculated from
CIRA72 model atmosphere, as described in the paper
Note (3): number of atoms along the line of sight in the atmosphere,
calculated from CIRA72 model atmosphere, as described in the paper
Byte-by-byte Description of file: maps.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Nx [92/182] Number of pixels along X-axis
4 A1 --- --- [x]
5- 6 I2 --- Ny [92/92] Number of pixels along Y-axis
7 A1 --- --- [x]
8 I1 --- Nz [2/2] Number of frames (map and error map)
10- 21 A12 --- FileName Name of FITS file
23- 83 A61 --- Text Explanations of file
--------------------------------------------------------------------------------
History:
* 27-Sep-1983 (Cat. VII/43/, CDS)
The tape with the data files and FORTRAN programs was received
at CDS, kindly supplied by W.T. Sanders (Wisconsin Univ.)
* 09-Oct-1997 (Cat. VII/43/, Seth W. Digel, NSSDC/ADC)
The count and exposure maps, both Aitoff and Zenithal Equal Area
projections, were converted to FITS format images. For the Aitoff and
Zenithal Equal Area polar projection maps, FITS files with look up
tables to convert pixel numbers to Galactic coordinates and vice versa
were generated. Because two projection centers were used for the
Aitoff maps, and polar projection maps for both the north and south
pole were used, a total of eight FITS files with lookup tables was
generated.
* 05-Jun-2014 (F. Ochsenbein, CDS)
Catalog moved to the IX section (high energy), and standard
documentation added.
(End) Seth W. Digel and Gail L. Schneider [SSDOO/ADC] 9-Oct-1997