ACDS V10.0 - Wed Jul 17 17:01:06 CEST 2019
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Detailed Description of II/328 :
AllWISE Data Release (Cutri+ 2013)
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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.
II/328 AllWISE Data Release (Cutri+ 2013)
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AllWISE Data Release
Cutri R.M., et al.
<IPAC/Caltech (2013)>
=2014yCat.2328....0C
================================================================================
ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys
Mission_Name: WISE
Description:
The Wide-field Infrared Survey Explorer (WISE; see Wright et al.
2010AJ....140.1868W) is a NASA Medium Class Explorer mission that
conducted a digital imaging survey of the entire sky in the 3.4, 4.6,
12 and 22um mid-infrared bandpasses (hereafter W1, W2, W3 and W4).
The AllWISE program extends the work of the successful Wide-field Infrared
Survey Explorer mission by combining data from the cryogenic and
post-cryogenic survey phases to form the most comprehensive view of the
mid-infrared sky currently available. AllWISE has produced a new Source
Catalog and Image Atlas with enhanced sensitivity and accuracy compared
with earlier WISE data releases. Advanced data processing for AllWISE
exploits the two complete sky coverages to measure source motions for
each Catalog source, and to compile a massive database of light curves
for those objects.
Acknowledging WISE in publications:
Please include the following in any published material that makes use
of the WISE data products:
"This publication makes use of data products from the Wide-field
Infrared Survey Explorer, which is a joint project of the University of
California, Los Angeles, and the Jet Propulsion Laboratory/California
Institute of Technology, funded by the National Aeronautics and Space
Administration."
File Summary:
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× allwise.sam 561 1000 *Sample of the AllWISE data release
(among 747,634,026 sources)
Note on allwise.sam : the catalog described here is a subset of the full AllWISE
catalog available from IRSA (http://irsa.ipac.caltech.edu/) with a
selection of the columns of the full catalog.
See also:
http://wise2.ipac.caltech.edu/docs/release/allwise/expsup/ : Explanatory
Supplement to the AllWISE Data Release Products
II/311 : The WISE All-Sky data Release (Cutri+ 2012)
II/246 : The 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: allwise.sam
Bytes Format Units Label Explanations
1- 19 A19 --- AllWISE WISE All-Sky Release Catalog name,
based on J2000 position,
<WISEA JHHMMSS.ss+DDMMSS.s> (designation)
21- 31 F11.7 deg RAJ2000 Right ascension (J2000)
33- 43 F11.7 deg DEJ2000 Declination (J2000)
45- 51 F7.4 arcsec eeMaj Semi-major axis of the error ellipse (1)
53- 59 F7.4 arcsec eeMin Semi-minor axis of the error ellipse (1)
61- 65 F5.1 deg eePA Position angle of the error ellipse (1)
67- 72 F6.3 mag W1mag ? W1 magnitude (3.35um)
74- 79 F6.3 mag W2mag ? W2 magnitude (4.6um)
81- 86 F6.3 mag W3mag ? W3 magnitude (11.6um)
88- 93 F6.3 mag W4mag ? W4 magnitude (22.1um)
95-100 F6.3 mag Jmag ? 2MASS J magnitude (1.25um)
102-107 F6.3 mag Hmag ? 2MASS H magnitude (1.65um)
109-114 F6.3 mag Kmag ? 2MASS Ks magnitude (2.17um)
116-120 F5.3 mag e_W1mag ? Mean error on W1 magnitude
122-126 F5.3 mag e_W2mag ? Mean error on W2 magnitude
128-132 F5.3 mag e_W3mag ? Mean error on W3 magnitude
134-138 F5.3 mag e_W4mag ? Mean error on W4 magnitude
140-144 F5.3 mag e_Jmag ? Mean error on J magnitude
146-150 F5.3 mag e_Hmag ? Mean error on H magnitude
152-156 F5.3 mag e_Kmag ? Mean error on Ks magnitude
158-165 F8.3 pix wx x-pixel coordinate on the Atlas Image
167-174 F8.3 pix wy y-pixel coordinate on the Atlas Image
176-194 I19 --- ID Unique source ID
196-202 F7.1 --- snr1 ? Signal to noise ratio for W1 filter
204-212 E9.3 --- chi2W1 ? Reduced {chi}2 of the W1 profile fit
214-220 F7.1 --- snr2 ? Signal to noise ratio for W2 filter
222-230 E9.3 --- chi2W2 ? Reduced {chi}2 of the W2 profile fit
232-238 F7.1 --- snr3 ? Signal to noise ratio for W3 filter
240-248 E9.3 --- chi2W3 ? Reduced {chi}2 of the W3 profile fit
250-257 F8.1 --- snr4 ? Signal to noise ratio for W4 filter
259-267 E9.3 --- chi2W4 ? Reduced {chi}2 of the W4 profile fit
269-277 E9.3 --- chi2 All-band combined reduced {chi}2
279 I1 --- nb [1-4] Number of PSF components used
simultaneously in the profile-fitting
281 I1 --- na [0/1] Active deblending flag (1 if a
detection was split into multiple sources)
283-287 F5.3 --- sat1 ? Saturated pixel fraction in W1 (w1sat)
289-293 F5.3 --- sat2 ? Saturated pixel fraction in W2 (w2sat)
295-299 F5.3 --- sat3 ? Saturated pixel fraction in W3 (w3sat)
301-305 F5.3 --- sat4 ? Saturated pixel fraction in W4 (w4sat)
307-310 A4 --- ccf [0DHOPdhop] Contamination and confusion flag,
one per band (cc_flags) (2)
312 I1 --- ex [0-5] Extended source flag (ext_flg) (3)
314-317 A4 --- var Variability flag, one per band (var_flg) (4)
319-322 I4 --- nW1 ? Frame detection count in W1 (w1nm) (5)
324-327 I4 --- mW1 ? Integer frame coverage in W1 (w1m) (6)
329-332 I4 --- nW2 ? Frame detection count in W2 (w2nm) (5)
334-337 I4 --- mW2 ? Integer frame coverage in W2 (w2m) (6)
339-342 I4 --- nW3 ? Frame detection count in W3 (w3nm) (5)
344-347 I4 --- mW3 ? Integer frame coverage in W3 (w3m) (6)
349-352 I4 --- nW4 ? Frame detection count in W4 (w4nm) (5)
354-357 I4 --- mW4 ? Integer frame coverage in W4 (w4m) (6)
359-362 I4 --- satnum Minimum sample at which saturation occurs
in each band
364-374 F11.7 deg RA_pm ? Right ascension at epoch MJD=55400.0
(2010.5589) from the profile-fitting
measurement model that includes motion.
376-386 F11.7 deg DE_pm ? Declination at epoch MJD=55400.0
(2010.5589) from the profile-fitting
measurement model that includes motion.
388-394 F7.4 arcsec eRApm ? error on RA_pm
396-402 F7.4 arcsec eDEpm ? error on DE_pm
404-411 F8.4 arcsec cosig_pm ? co-sigma of the equatorial position
uncertainties
413-419 I7 mas/yr pmRA ? Apparent motion in RA (9)
421-427 I7 mas/yr e_pmRA ? Mean error on pmRA (9)
429-435 I7 mas/yr pmDE ? Apparent motion in DE (9)
437-443 I7 mas/yr e_pmDE ? Mean error on pmDE (9)
445-453 E9.3 --- chi2W1_pm ? Reduced {chi}2 of the W1 profile fit
including motion estimation
455-463 E9.3 --- chi2W2_pm ? Reduced {chi}2 of the W2 profile fit
including motion estimation
465-473 E9.3 --- chi2W3_pm ? Reduced {chi}2 of the W3 profile fit
including motion estimation
475-483 E9.3 --- chi2W4_pm ? Reduced {chi}2 of the W4 profile fit
including motion estimation
485-493 E9.3 --- chi2pm ? Combined reduced {chi}2 profile fit
including motion estimation
495-499 A5 --- qpm ? Motion estimation quality (pmcode) (7)
501-504 A4 --- qph [ABCUXZ] Photometric quality flag (8)
506-507 I2 --- fdet [0-15] Bit-encoded integer indicating bands
in which a source has a w?snr>2 detection
509-512 I4 --- fmoon Scattered moonlight contamination flag
514-520 F7.3 --- covW1 ? Mean pixel coverage in W1
522-528 F7.3 --- covW2 ? Mean pixel coverage in W2
530-536 F7.3 --- covW3 ? Mean pixel coverage in W3
538-544 F7.3 --- covW4 ? Mean pixel coverage in W4
546-555 I10 --- 2Mkey ? 2MASS PSC association (not identification)
557-561 F5.3 arcsec d2M ? Distance separating the positions of the
WISE source and associated 2MASS PSC source
Note (1): the parameters of the error ellipse are computed from the
1-{sigma} in RA and Dec (sigra, sigdec) and the co-{sigma} sigradec
with the formulae:
{Delta} = (sigra2-sigdec2)2 + 4*sigradec2
eeMaj2 = 0.5*(sigra2+sigdec2+sqrt({Delta}))
eeMin2 = 0.5*(sigra2+sigdec2-sqrt({Delta}))
tan(eePA) = (eeMaj2-sigdec2)/(sigradec*|sigradec|)
= (sigradec*|sigradec|)/(eeMaj2-sigra2)
Conversely, the sigra/sigdec are given by:
sigra2 = eeMaj2sin2(eePA) + eeMin2cos2(eePA)
sigdec2 = eeMaj2cos2(eePA) + eeMin2sin2(eePA)
Note (2): One character per band (W1/W2/W3/W4) that indicates that the
photometry and/or position measurements of a source may be
contaminated or biased due to proximity to an image artifact:
D,d = Diffraction spike. Source may be a spurious detection of or
contaminated by a diffraction spike from a nearby bright star on
the same image
P,p = Persistence. Source may be a spurious detection of or contaminated
by a latent image left by a bright star
H,h = Halo. Source photometry may be a spurious detection of or
contaminated by the scattered light halo surrounding a nearby
bright source
O,o = (letter "o") Optical ghost. Source may be a spurious detection
of or contaminated by an optical ghost image caused by a nearby bright
source
0 = (number zero) Source is unaffected by known artifacts.
Note (3): Extended source flag.
0 = The source shape is consistent with a point-source and the source is not
associated with or superimposed on a 2MASS XSC source
1 - The profile-fit photometry goodness-of-fit, w?rchi2, is >3.0 in one or
more bands.
2 = The source falls within the extrapolated isophotal footprint of a
2MASS XSC source.
3 = The profile-fit photometry goodness-of-fit, w?rchi2, is >3.0 in one or
more bands, and The source falls within the extrapolated isophotal
footprint of a 2MASS XSC source.
4 = The source position falls within 5" of a 2MASS XSC source.
> 5 = The profile-fit photometry goodness-of-fit, w?rchi2, is >3.0 in one or
> more bands, and the source position falls within 5" of a 2MASS XSC source.
Note (4): The variability flag is a 4-character string, one character per
band, containing a value related to the probability that the source
flux measured on the individual WISE exposures is variable.
* value "n" indicates insufficient or inadequate data to make a
determination (<6 exposures)
* values 0 thru 9 indicate increasing probabilities of variation;
- values 0-5 are most likely not variable,
- values 6-7 are likely variables (but susceptible of false-positive
variability)
- values >7 have the highest probability of being true variables
Note (5): Integer frame detection count. This column gives the number of
individual 7.7s exposures on which this source was detected with SNR>3
in the W1 profile-fit measurement. This number can be zero for sources
that are well-detected on the coadded Atlas Image, but too faint for
detection on the single exposures.
Note (6): number of individual 7.7s W1 exposures on which a profile-fit
measurement of this source was possible. This number can differ between
the four bands because band-dependent criteria are used to select
individual frames for inclusion in the coadded Atlas Images. This column
is null if there is no frame coverage in this band at the position of
this source.
Note (7): five character string that encodes information about factors that
impact the accuracy of the motion estimation. These include the original
blend count, whether a blend-swap took place, and the distance in
hundredths of an arcsecond between the non-motion position and the
motion mean-observation-epoch position. The format is NQDDD
where N is the original blend count, Q is either "Y" or "N" for "yes" or
"no" a blend-swap occurred (i.e., the original primary component was not
the final primary component), and DDD is the radial distance between the
non-motion and motion at mean-observation epoch positions in units of
0.01 arcsec, clipped at 999 (almost 10 arcsec).
Note (8): Four character flag, one character per band [W1/W2/W3/W4], that
provides a shorthand summary of the quality of the profile-fit photometry
measurement in each band, as derived from the measurement signal-to-noise
ratio:
A = Source is detected in this band with a flux signal-to-noise ratio
w?snr>10.
B = Source is detected in this band with a flux signal-to-noise ratio
3<w?snr<10.
C = Source is detected in this band with a flux signal-to-noise ratio
2<w?snr<3.
U = Upper limit on magnitude. Source measurement has w?snr<2. The
profile-fit magnitude w?mpro is a 95% confidence upper limit.
X = A profile-fit measurement was not possible at this location in this
band. The value of w?mpro and w?sigmpro will be "null" in this band.
Z = A profile-fit source flux measurement was made at this location, but
the flux uncertainty could not be measured. The value of w?sigmpro
will be "null" in this band. The value of w?mpro will be "null" if
the measured flux, w?flux, is negative, but will not be "null" if
the flux is positive. If a non-null magnitude is present, it
corresponds to the true flux, and not the 95% confidence upper limit.
This occurs for a small number of sources found in a narrow range of
ecliptic longitude which were covered by a large number of saturated
pixels from 3-Band Cryo single-exposures.
Note (9): CAUTION - Note concerning "proper" motions:
according to AllWISE documentation, the motions measured are not
proper motions because they are affected by parallax motions.
More information is given in:
http://wise2.ipac.caltech.edu/docs/release/allwise/expsup/sec2_6.html
#HowToInterpret
History:
From http://wise2.ipac.caltech.edu/docs/release/allwise/expsup/sec2_1a.html
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(End) Laurent Cambresy [CDS] 29-Jan-2014