ACDS V10.0 - Mon Dec 19 13:33:09 CET 2022
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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)
================================================================================
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 1455 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- 44 A22 --- Name GALEX identifier in JHHMMSS.s+DDMMSS format;
column added by CDS
46- 64 I19 --- objid GALEX identifier for the source (objid)
66- 84 I19 --- phID Pointer to photoExtract Table
(id of original observation on which
the measurement was taken) (photoextractid)
86- 88 A3 --- Cat Survey type (always "AIS"
= All-sky Imaging Survey) (mpstype)
90- 99 F10.6 deg RAfdeg RA of center of field (avaspra)
101-110 F10.6 deg DEfdeg DE of center of field (avaspdec)
112-117 F6.2 s FUVexp [30/709] FUV exposure time
119-125 F7.2 s NUVexp [30/1134] NUV exposure time
127-134 F8.4 deg GLON Galactic longitude
136-143 F8.4 deg GLAT Galactic latitude
145-149 I5 --- tile [50000/50491] Tile number (tilenum)
151-154 I4 --- img [33/3172] Image number (img)
156-157 I2 --- sv [1/99] Number of subvisit if exposure was
divided (subvisit)
159-166 F8.6 deg r.fov [/0.6] Distance of source from center of
the field (fov_radius)
168 I1 --- Obs [1] Observation type (1=multi) (type)
170 I1 --- b [1/3] bands: 1=NUV, 2=FUV, 3=both (band)
172-177 F6.4 mag E(B-V) [0.0007/0.5] E(B-V) Galactic Reddening (from
Schlegel+ 1998ApJ...500..525S maps) (E_bv)
179 I1 --- Sp? [0/1] 1 if a spectrum exists (istherespectrum)
181 I1 --- chkf [0/1] Astrometry check type (chkobj_type)
183-189 F7.4 mag FUVmag [10.6/23.8]? GALEX FUV calibrated magnitude
in AB system (fuv_mag)
191-196 F6.4 mag e_FUVmag [0.001/0.6]? FUV mag error (fuv_magerr)
198-204 F7.4 mag NUVmag [9.6/24.5] GALEX NUV calibrated magnitude
in AB system (nuv_mag)
206-211 F6.4 mag e_NUVmag [0.0007/0.5] NUV mag error (nuv_magerr)
213-219 F7.4 mag FUV.a [-8.2/5]? FUV Kron-like elliptical
aperture magnitude (fuvmagauto)
221-226 F6.4 mag e_FUV.a [0.001/0.6]? FUV RMS error for AUTO magnitude
(fuvmagerrauto)
228-235 F8.4 mag NUV.a [-10.5/4.4] NUV Kron-like elliptical aperture
magnitude (nuvmagauto)
237-242 F6.4 mag e_NUV.a [0.0007/0.5] NUV RMS error for AUTO magnitude
(nuvmagerrauto)
244-250 F7.4 mag FUV.4 [-7.2/99]? FUV mag aperture (8 pix diameter)
(fuvmagaper_4)
252-260 F9.4 mag e_FUV.4 [0.002/4911]? FUV mag aperture error (8 pix
diameter) (fuvmagerraper_4)
262-268 F7.4 mag NUV.4 [-7.5/99] NUV mag aperture (8 pix diameter)
(nuvmagaper_4)
270-278 F9.4 mag e_NUV.4 [0.001/2559] NUV mag aperture error (8 pix
diameter) (nuvmagerraper_4)
280-286 F7.4 mag FUV.6 [-7.4/99]? FUV mag aperture (17 pix diameter)
(fuvmagaper_6)
288-297 F10.4 mag e_FUV.6 [0.001/37286]? FUV mag aperture error (17 pix
diameter) (fuvmagerraper_6)
299-305 F7.4 mag NUV.6 [-8.3/99] NUV mag aperture (17 pix diameter)
(nuvmagaper_6)
307-319 F13.4 mag e_NUV.6 [0.001/15473111] NUV mag aperture error (17 pix
diameter) (nuvmagerraper_6)
321-323 I3 --- Fafl [0/416]? FUV artifact flag (logical OR
near source) (fuv_artifact)
325-327 I3 --- Nafl [0/913] NUV artifact flag (logical OR
near source) (nuv_artifact)
329-330 I2 --- Fexf [0/19]? Extraction flags for FUV band
(fuv_flags)
332-333 I2 --- Nexf [0/51] Extraction flags for NUV band
(nuv_flags)
335-346 F12.5 uJy Fflux [1/201899]? FUV calibrated flux (fuv_flux)
348-358 F11.5 uJy e_Fflux [0.5/18719]? FUV flux error (fuv_fluxerr)
360-371 F12.5 uJy Nflux [0.6/202886] NUV calibrated flux (nuv_flux)
373-382 F10.5 uJy e_Nflux [0.2/3649] NUV flux error (nuv_fluxerr)
384-390 F7.2 pix FXpos ? Source position in FUV image
along x (fuvximage)
392-398 F7.2 pix FYpos ? Source position in UV image
along y (fuvyimage)
400-406 F7.2 pix NXpos Source position in NUV image
along x (nuvximage)
408-414 F7.2 pix NYpos Source position in NUV image
along y (nuvyimage)
416-423 F8.3 pix Fima ? Source FWHM in FUV assuming a
gaussian core (fuvfwhmimage)
425-431 F7.3 pix Nima Source FWHM in NUV assuming a
gaussian core (nuvfwhmimage)
433-441 F9.6 deg Fr [-0.2/0.3]? Source FWHM in FUV assuming a
gaussian core (fuvfwhmworld)
442-450 F9.6 deg Nr [-0.1/0.5] Source FWHM in NUV assuming a
gaussian core (nuvfwhmworld)
451-456 F6.4 --- nS/G Star/galaxy classifier from NUV
(nuvclassstar)
458-463 F6.4 --- fS/G ? Star/galaxy classifier from FUV
(fuvclassstar)
465-470 F6.4 --- nell 1-b/a in NUV (nuv_ellipticity)
472-477 F6.4 --- fell ? 1-b/a in FUV (fuv_ellipticity)
479-484 F6.2 deg nPA Position angle in NUV (nuvthetaj2000)
486-491 F6.2 deg e_nPA [-90/] Position angle error in NUV
(nuverrthetaj2000)
493-498 F6.2 deg fPA ? Position angle in FUV (fuvthetaj2000)
500-505 F6.2 deg e_fPA [-90/]? Position angle error in FUV
(fuverrthetaj2000)
507-520 E14.2 pix Fnr [/965]? FUV FWHM IMAGE value from
-fd-ncat.fits (fuvncatfwhm_image) (4)
522-535 E14.2 pix F3r [/1.98E7]? FUV flux radius
(fuvncatfluxrad3) (4)
537-544 F8.5 --- Nar [3.5/13.2] Kron apertures in units of a or b
(nuvkronradius)
546-553 F8.6 deg Narms [0.0002/0.1] Profile RMS along major axis
(nuvaworld)
555-562 F8.6 deg Nbrms [0.00004/0.06] Profile RMS along minor axis
(nuvbworld)
564-571 F8.5 --- Far [3.5/11]? Kron apertures in units of a or b
(fuvkronradius)
573-580 F8.6 deg Farms [0.0002/0.06]? Profile RMS along major axis
(fuvaworld)
582-589 F8.6 deg Fbrms [0.0001/0.03]? Profile RMS along minor axis
(fuvbworld)
591-595 F5.1 s NUVw [0/964] NUV effective exposure (flat-field
response value) at the source position
(nuv_weight)
597-601 F5.1 s FUVw [0/700] FUV effective exposure (fuv_weight)
603-610 E8.6 --- Prob ? Probability of the FUVxNUV match (prob)
612-615 F4.2 arcsec Sep [0/7.1]? Separation between FUV and NUV
position of the source in the same
observation (sep)
617-620 F4.2 arcsec Nerr [0.4/3.3] Position error of the source in the
NUV image (nuv_poserr)
622-625 F4.2 arcsec Ferr [0.4/2.4]? Position error of the source in
the FUV image (fuv_poserr)
627-630 F4.2 arcsec Ierr [0.4/3.4]? Inter-band position error
(ib_poserr)
632-635 F4.2 arcsec Nperr [0.001/2.8] NUV Poisson position error
(nuv_pperr)
637-640 F4.2 arcsec Fperr [0.001/1.6]? FUV Poisson position error
(fuv_pperr)
642 A1 --- CV [CV] Whether the source comes from a coadd or
visit (corv)
644-645 I2 --- G [-1/1] Neighbours rank (grank) (1)
647-648 I2 --- N [1/12] Number of sources within 2.5", if this
is a primary (ngrank)
650-668 I19 --- primid objid of the primary (only of use for
the "plus" catalog) (primgid)
670-908 A239 --- groupid objid's of all sources (AIS) within 2.5",
concatenated by "+" (groupgid)
910-911 I2 --- Gd [-1/1] as for "G" (grank), but based on
distance criterion (grankdist) (1)
913-914 I2 --- Nd [1/12] as for "N" (ngrank), but based on
distance criterion (ngrankdist)
916-934 I19 --- primidd objid of the closest primary, based on distance
criterion (primgiddist)
936-1174 A239 --- groupidd objid's of all sources (AIS) within 2.5",
based on distance criterion (groupgiddist)
1176-1414 A239 --- groupTot objid's of all sources within 2.5"
(groupgidtot)
1416-1446 A31 --- OName Extended object? (if not: "N") (inlargeobj) (2)
1448-1455 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°)
20-Nov-2018: Insert into VizieR
22-May-2019: Column Name added
================================================================================
(End) Thomas Boch, Emmanuelle Perret [CDS] 07-Aug-2017