ACDS V10.0 - Thu Apr 25 16:13:01 CEST 2019
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Detailed Description of II/335 :
Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
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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/335 Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
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Revised catalog of GALEX ultraviolet sources.
I. The All-Sky Survey: GUVcat_AIS.
Bianchi L., Shiao B., Thilker D.
<Astrophys. J. Suppl. Ser., 230, 24-24 (2017)>
=2017ApJS..230...24B (SIMBAD/NED BibCode)
=2014AdSpR..53..900B
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ADC_Keywords: Photometry, ultraviolet ; Ultraviolet
Mission_Name: GALEX
Keywords: catalogs; Galaxy: stellar content; stars: AGB and post-AGB;
stars: early-type; surveys; ultraviolet: general
Abstract:
The Galaxy Evolution Explorer (GALEX) imaged the sky in two
ultraviolet (UV) bands, far-UV (FUV, {lambda}eff~1528Å), and
near-UV (NUV, {lambda}eff~2310Å), delivering the first
comprehensive sky surveys at these wavelengths. The GALEX database
contains FUV and NUV images, ~500 million source measurements and over
100000 low-resolution UV spectra. The UV surveys are a unique resource
for statistical studies of hot stellar objects, z<~2 QSOs,
star-forming galaxies, nebulae and the interstellar medium, and
provide a roadmap for planning future UV instrumentation and follow-up
observing programs. We present science-enhanced, "clean" catalogs of
GALEX UV sources, with useful tags to facilitate scientific
investigations. The catalogs are an improved and expanded version of
our previous catalogs of UV sources (BCScat; Bianchi+, 2011,
J/MNRAS/411/2770 ; II/312 and 2014AdSpR..53..900B). With respect to
BCScat, we have patched 640 fields for which the pipeline had
improperly coadded non-overlapping observations, and we provide a
version with a larger sky coverage (about 10%) by relaxing the
restriction to the central area of the GALEX field to 1.1°
diameter (GUVcatAISfov055: GUVcat_AIS FOV_radius <0.55°), as
well as the cleaner, more restrictive version using only the 1°
central portion of each field as in BCScat (GUVcatAISfov050:
GUVcat_AIS FOV_radius <0.50°). We added new tags to facilitate
selection and cleaning of statistical samples for science
applications: we flag sources within the footprint of extended objects
(nearby galaxies, stellar clusters) so that these regions can be
excluded for estimating source density. As in our previous catalogs,
in GUVcat duplicate measurements of the same source are removed, so
that each astrophysical object has only one entry. Such a
unique-source catalog is needed to study the density and distributions
of sources, and to match UV sources with catalogs at other
wavelengths. The catalog includes all observations from the All-Sky
Imaging Survey (AIS), the survey with the largest area coverage, with
both FUV and NUV detectors exposed: over 28700 fields, made up of a
total of 57000 observations ("visits"). The total area covered, when
overlaps are removed and gaps are accounted for, is 24790 square
degrees for GUVcatAISfov055 (GUVcatAISfov055) and 22125 square
degrees for (GUVcatAISfov050). The total numbers of "unique" AIS
sources (eliminating duplicate measurements) are 82,992,086
(GUVcatAISfov055) and 69,772,677 (GUVcatAISfov050). The typical
depth of the GUVcat_AIS catalog is FUV=19.9, NUV=20.8 AB mag.
Description:
The Galaxy Evolution Explorer (GALEX) was a NASA Small Explorer
mission which imaged the sky in 2 ultraviolet bands, FUV (far-UV) and
NUV (near-UV) and provided the first UV sky surveys. It was launched
on 2003 April 28 and decommissioned by NASA on 2013 June 28.
Its characteristics are:
--------------------------------------------------------------------
FUV NUV
--------------------------------------------------------------------
Bandwidth 1344-1786 1771-2831 (Å)
Effective wavelength 1538.6 2315.7 (Å)
Astrometry (R<0.6deg) 0.59 0.49 (arcsec)
Photometry (1 sigma) 0.05 0.03 (ABmag)
Zero point 18.82 20.08 (ABmag)
Image resolution 4.2 5.3 (arcsec/pix)
Spectral resolution 200 118 ({delta}{lambda}/{lambda})
Field of view 1.28 1.24 (deg)
--------------------------------------------------------------------
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× galex_ais.sam 1432 1000 Sample of the revised GALEX catalog of UV sources
(GUVcat_AIS) from GR6+7 (82,992,086 sources)
× table2.dat 139 381 List of clusters included in the GUVcat footprint
× table3.dat 133 15659 List of galaxies larger than 1' included in
the GUVcat footprint
× table4.dat 126 29535 List of AIS GALEX fields used to construct
the GUVcat AIS catalog
× table5.dat 206 2004 List of AIS eliminated bad coadds, and
their associated visits
See also:
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
J/ApJS/173/185 : GALEX UV atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJS/173/572 : GALEX/Spitzer photometry in NGC 7331 (Thilker+, 2007)
J/AJ/137/3761 : Ultraviolet quasi-stellar objects (Bianchi+, 2009)
J/ApJ/703/614 : UV star-forming regions in M31 (Kang+, 2009)
J/ApJ/730/88 : Star-forming regions in NGC 6822 from UV (Efremova+, 2011)
J/MNRAS/411/2770 : Hot white dwarfs in GALEX-DR5 (Bianchi+, 2011)
http://galex.stsci.edu/ : the GALEX database in MAST (STScI)
http://dolomiti.pha.jhu.edu/uvsky/ : GALEX science catalogs and tools
http://www.galex.caltech.edu/ : the GALEX home page at Caltech
Byte-by-byte Description of file: galex_ais.sam
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Source's right ascension (J2000) (RA)
12- 21 F10.6 deg DEdeg Source's declination (J2000) (DEC)
23- 41 I19 --- objid GALEX identifier for the source (objid)
43- 61 I19 --- phID Pointer to photoExtract Table
(id of original observation on which
the measurement was taken) (photoextractid)
63- 65 A3 --- Cat Survey type (always "AIS"
= All-sky Imaging Survey) (mpstype)
67- 76 F10.6 deg RAfdeg RA of center of field (avaspra)
78- 87 F10.6 deg DEfdeg DE of center of field (avaspdec)
89- 94 F6.2 s FUVexp [30/709] FUV exposure time
96-102 F7.2 s NUVexp [30/1134] NUV exposure time
104-111 F8.4 deg GLON Galactic longitude
113-120 F8.4 deg GLAT Galactic latitude
122-126 I5 --- tile [50000/50491] Tile number (tilenum)
128-131 I4 --- img [33/3172] Image number (img)
133-134 I2 --- sv [1/99] Number of subvisit if exposure was
divided (subvisit)
136-143 F8.6 deg r.fov [/0.6] Distance of source from center of
the field (fov_radius)
145 I1 --- Obs [1] Observation type (1=multi) (type)
147 I1 --- b [1/3] bands: 1=NUV, 2=FUV, 3=both (band)
149-154 F6.4 mag E(B-V) [0.0007/0.5] E(B-V) Galactic Reddening (from
Schlegel+ 1998ApJ...500..525S maps) (E_bv)
156 I1 --- Sp? [0/1] 1 if a spectrum exists (istherespectrum)
158 I1 --- chkf [0/1] Astrometry check type (chkobj_type)
160-166 F7.4 mag FUVmag [10.6/23.8]? GALEX FUV calibrated magnitude
in AB system (fuv_mag)
168-173 F6.4 mag e_FUVmag [0.001/0.6]? FUV mag error (fuv_magerr)
175-181 F7.4 mag NUVmag [9.6/24.5] GALEX NUV calibrated magnitude
in AB system (nuv_mag)
183-188 F6.4 mag e_NUVmag [0.0007/0.5] NUV mag error (nuv_magerr)
190-196 F7.4 mag FUV.a [-8.2/5]? FUV Kron-like elliptical
aperture magnitude (fuvmagauto)
198-203 F6.4 mag e_FUV.a [0.001/0.6]? FUV RMS error for AUTO magnitude
(fuvmagerrauto)
205-212 F8.4 mag NUV.a [-10.5/4.4] NUV Kron-like elliptical aperture
magnitude (nuvmagauto)
214-219 F6.4 mag e_NUV.a [0.0007/0.5] NUV RMS error for AUTO magnitude
(nuvmagerrauto)
221-227 F7.4 mag FUV.4 [-7.2/99]? FUV mag aperture (8 pix diameter)
(fuvmagaper_4)
229-237 F9.4 mag e_FUV.4 [0.002/4911]? FUV mag aperture error (8 pix
diameter) (fuvmagerraper_4)
239-245 F7.4 mag NUV.4 [-7.5/99] NUV mag aperture (8 pix diameter)
(nuvmagaper_4)
247-255 F9.4 mag e_NUV.4 [0.001/2559] NUV mag aperture error (8 pix
diameter) (nuvmagerraper_4)
257-263 F7.4 mag FUV.6 [-7.4/99]? FUV mag aperture (17 pix diameter)
(fuvmagaper_6)
265-274 F10.4 mag e_FUV.6 [0.001/37286]? FUV mag aperture error (17 pix
diameter) (fuvmagerraper_6)
276-282 F7.4 mag NUV.6 [-8.3/99] NUV mag aperture (17 pix diameter)
(nuvmagaper_6)
284-296 F13.4 mag e_NUV.6 [0.001/15473111] NUV mag aperture error (17 pix
diameter) (nuvmagerraper_6)
298-300 I3 --- Fafl [0/416]? FUV artifact flag (logical OR
near source) (fuv_artifact)
302-304 I3 --- Nafl [0/913] NUV artifact flag (logical OR
near source) (nuv_artifact)
306-307 I2 --- Fexf [0/19]? Extraction flags for FUV band
(fuv_flags)
309-310 I2 --- Nexf [0/51] Extraction flags for NUV band
(nuv_flags)
312-323 F12.5 uJy Fflux [1/201899]? FUV calibrated flux (fuv_flux)
325-335 F11.5 uJy e_Fflux [0.5/18719]? FUV flux error (fuv_fluxerr)
337-348 F12.5 uJy Nflux [0.6/202886] NUV calibrated flux (nuv_flux)
350-359 F10.5 uJy e_Nflux [0.2/3649] NUV flux error (nuv_fluxerr)
361-367 F7.2 pix FXpos ? Source position in FUV image
along x (fuvximage)
369-375 F7.2 pix FYpos ? Source position in UV image
along y (fuvyimage)
377-383 F7.2 pix NXpos Source position in NUV image
along x (nuvximage)
385-391 F7.2 pix NYpos Source position in NUV image
along y (nuvyimage)
393-400 F8.3 pix Fima ? Source FWHM in FUV assuming a
gaussian core (fuvfwhmimage)
402-408 F7.3 pix Nima Source FWHM in NUV assuming a
gaussian core (nuvfwhmimage)
410-418 F9.6 deg Fr [-0.2/0.3]? Source FWHM in FUV assuming a
gaussian core (fuvfwhmworld)
419-427 F9.6 deg Nr [-0.1/0.5] Source FWHM in NUV assuming a
gaussian core (nuvfwhmworld)
428-433 F6.4 --- nS/G Star/galaxy classifier from NUV
(nuvclassstar)
435-440 F6.4 --- fS/G ? Star/galaxy classifier from FUV
(fuvclassstar)
442-447 F6.4 --- nell 1-b/a in NUV (nuv_ellipticity)
449-454 F6.4 --- fell ? 1-b/a in FUV (fuv_ellipticity)
456-461 F6.2 deg nPA Position angle in NUV (nuvthetaj2000)
463-468 F6.2 deg e_nPA [-90/] Position angle error in NUV
(nuverrthetaj2000)
470-475 F6.2 deg fPA ? Position angle in FUV (fuvthetaj2000)
477-482 F6.2 deg e_fPA [-90/]? Position angle error in FUV
(fuverrthetaj2000)
484-497 E14.2 pix Fnr [/965]? FUV FWHM IMAGE value from
-fd-ncat.fits (fuvncatfwhm_image) (4)
499-512 E14.2 pix F3r [/1.98E7]? FUV flux radius
(fuvncatfluxrad3) (4)
514-521 F8.5 --- Nar [3.5/13.2] Kron apertures in units of a or b
(nuvkronradius)
523-530 F8.6 deg Narms [0.0002/0.1] Profile RMS along major axis
(nuvaworld)
532-539 F8.6 deg Nbrms [0.00004/0.06] Profile RMS along minor axis
(nuvbworld)
541-548 F8.5 --- Far [3.5/11]? Kron apertures in units of a or b
(fuvkronradius)
550-557 F8.6 deg Farms [0.0002/0.06]? Profile RMS along major axis
(fuvaworld)
559-566 F8.6 deg Fbrms [0.0001/0.03]? Profile RMS along minor axis
(fuvbworld)
568-572 F5.1 s NUVw [0/964] NUV effective exposure (flat-field
response value) at the source position
(nuv_weight)
574-578 F5.1 s FUVw [0/700] FUV effective exposure (fuv_weight)
580-587 E8.6 --- Prob ? Probability of the FUVxNUV match (prob)
589-592 F4.2 arcsec Sep [0/7.1]? Separation between FUV and NUV
position of the source in the same
observation (sep)
594-597 F4.2 arcsec Nerr [0.4/3.3] Position error of the source in the
NUV image (nuv_poserr)
599-602 F4.2 arcsec Ferr [0.4/2.4]? Position error of the source in
the FUV image (fuv_poserr)
604-607 F4.2 arcsec Ierr [0.4/3.4]? Inter-band position error
(ib_poserr)
609-612 F4.2 arcsec Nperr [0.001/2.8] NUV Poisson position error
(nuv_pperr)
614-617 F4.2 arcsec Fperr [0.001/1.6]? FUV Poisson position error
(fuv_pperr)
619 A1 --- CV [CV] Whether the source comes from a coadd or
visit (corv)
621-622 I2 --- G [-1/1] Neighbours rank (grank) (1)
624-625 I2 --- N [1/12] Number of sources within 2.5", if this
is a primary (ngrank)
627-645 I19 --- primid objid of the primary (only of use for
the "plus" catalog) (primgid)
647-885 A239 --- groupid objid's of all sources (AIS) within 2.5",
concatenated by "+" (groupgid)
887-888 I2 --- Gd [-1/1] as for "G" (grank), but based on
distance criterion (grankdist) (1)
890-891 I2 --- Nd [1/12] as for "N" (ngrank), but based on
distance criterion (ngrankdist)
893-911 I19 --- primidd objid of the closest primary, based on distance
criterion (primgiddist)
913-1151 A239 --- groupidd objid's of all sources (AIS) within 2.5",
based on distance criterion (groupgiddist)
1153-1391 A239 --- groupTot objid's of all sources within 2.5"
(groupgidtot)
1393-1423 A31 --- OName Extended object? (if not: "N") (inlargeobj) (2)
1425-1432 F8.2 pix Size [/38740]?=0 Size of the extended object
(largeobjsize) (3)
Note (1): Code for grank as follows:
0 = no other sources (from different observations) within 2.5"
1 = the best (see text) source of >1 sources within 2.5"
-1 = this is a primary but has a better source within 2.5"
>1 = this is the nth source within 2.5" of the primary
Note (2): Type of object is included with the name of the extended object:
XX:name-of-the-extended-object ; where XX = GA (galaxy),
GC (globular cluster), OC (open cluster), SC (other stellar clusters).
Note (3): D25 for galaxies and 2xR1 for stellar clusters.
Note (4): Negative values have been replaced by blank values by CDS.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 15 A15 --- ID Source identifier (1)
17- 26 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
28- 37 F10.6 deg DEdeg Declination in decimal degrees (J2000)
39- 48 F10.6 deg GLON Galactic longitude in decimal degrees (J2000)
50- 59 F10.6 deg GLAT Galactic latitude in decimal degrees (J2000)
61- 65 F5.3 deg R1 Angular radius of central part of cluster
67- 69 I3 --- o_R1 Number of optical cluster stars (most
probable) inside R1
71- 75 F5.3 deg R0 Angular radius of core of cluster
77- 79 I3 --- o_R0 Number of optical cluster stars (most
probable) inside R0
81-131 A51 --- Class Cluster classification (2)
133 A1 --- Bd Broad type (3)
135 A1 --- St Cluster status (4)
137-139 A3 --- Type Cluster type (5)
Note (1): Globular clusters listed first, then open clusters, and then
star clusters. Data and classification from compilation of cluster
catalogs at http://heasarc.nasa.gov/W3Browse/all/mwsc.html (MWSC).
NGC, IC or other common designation, as in MWSC compilation
Note (2): HEASARC MWSC classification, based on the value of the
Broad type parameter.
Note (3): Flag parameter (from http://heasarc.nasa.gov/W3Browse/all/mwsc.html)
indicating cluster type.
G = globular cluster;
O = open cluster ("blank" in the original MWSC compilation);
M = moving group;
R = remnant cluster;
A = association;
N = nebulosity/presence of nebulosity.
Note (4): flag parameter set for objects which are not open clusters (from
https://heasarc.nasa.gov/W3Browse/all/mwsc.html).
C = candidate;
O = object.
Note (5): From MWSC.
GLO = globular cluster/possible globular cluster;
IRC = infrared cluster;
ASS = stellar association;
REM = Possible cluster remnant;
EMB = embedded open cluster/cluster associated with nebulosity.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 28 A28 --- ID Source identifier
30- 31 A2 --- Type Source type (1)
33- 42 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000)
44- 53 F10.6 deg DEdeg Declination in decimal degrees (J2000)
55- 64 F10.6 deg GLON Galactic longitude
66- 75 F10.6 deg GLAT Galactic latitude
77- 82 I6 km/s v3k Radial velocity (cz) with respect to
CMB radiation (2)
84- 89 I6 km/s vlg Radial velocity (cz) with respect to
Local Group (2)
91- 98 F8.3 deg PosAng Position angle (2)
100-105 F6.3 deg Inc Inclination
107-112 F6.2 [arcmin] D25 D25 diameter in units of arcmin
114-118 F5.2 [arcmin] e_D25 Uncertainty in D25
120-126 F7.3 [-] R25 Axis ratio (major axis / minor axis)
128-133 F6.3 [-] e_R25 Uncertainty in R25
Note (1): Type as follows:
G = galaxy or quasar;
Q = QSO;
? = Extended source of unknown/uncertain nature;
M = Multiple galaxy.
Note (2): A -999 indicates a null value.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 19 A19 --- ID Field identifier
21- 40 F20.16 deg RAdeg Center Right Ascension (J2000)
42- 61 F20.16 deg DEdeg Center Declination (J2000)
63- 82 F20.16 deg GLON Center Galactic longitude
84-103 F20.16 deg GLAT Center Galactic latitude
105-111 F7.3 s FUVexp FUV exposure time
113-120 F8.3 s NUVexp NUV exposure time
122-126 A5 --- CorV Observation type (1)
Note (1): Coadd or Visit.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 19 I19 --- C-ID Coadd identifier (1)
21- 40 F20.16 deg RAdeg [1/360.1] Coadd center Right Ascension (J2000)
42- 61 F20.16 deg DEdeg [-89/89] Coadd center Declination (J2000)
63- 82 F20.16 deg C-GLON Coadd center Galactic longitude
84-103 F20.16 deg C-GLAT Coadd center Galactic latitude
105-111 F7.3 s C-FUVexp Coadd FUV exposure time
113-119 F7.3 s C-NUVexp Coadd NUV exposure time
121-139 I19 --- V-ID Visit identifier
141-160 F20.16 deg RAVdeg Visit center Right Ascension (J2000)
162-181 F20.16 deg DEVdeg Visit center Declination (J2000)
183-189 F7.3 s V-FUVexp Visit FUV exposure time
191-197 F7.3 s V-NUVexp Visit NUV exposure time
199-204 F6.3 arcmin Dist Angular distance between Coadd
and Visit observations
206 A1 --- GUVcat In GUVcat; G=Yes,N=No
Note (1): The 640 badcoadds were included in BCScat, prior to our discovery of
the database improper coadding of non-overlapping visits; they are
not used in GUVcat, and their corresponding visits with both FUV and
NUV exposure times >0 are used instead (1468 out of 2004 total).
History:
Tables 2-5 from electronic version of 2017ApJS..230...24B
GALEX GR6+7 downloaded from:
http://dolomiti.pha.jhu.edu/uvsky/GUVcat/GUVcat_AIS.html
(GUVcatAISfov055: GUVcat_AIS FOV_radius <0.55°)
================================================================================
(End) Thomas Boch, Emmanuelle Perret [CDS] 07-Aug-2017