J/MNRAS/420/1115 UV-excess sources from UVEX (Verbeek+, 2012)
A first catalogue of automatically selected ultraviolet-excess sources from the
UVEX survey.
Verbeek K., De Groot E., Groot P.J., Scaringi S., Drew J., Greimel R.,
Irwin M., Gonzalez-Solares E., Gansicke B.T., Casares J.,
Corral-Santana J.M., Deacon N., Steeghs D.
<Mon. Not. R. Astron. Soc., 420, 1115-1134 (2012)>
=2012MNRAS.420.1115V 2012MNRAS.420.1115V
ADC_Keywords: Galaxy catalogs ; Ultraviolet ; Photometry
Keywords: surveys - stars: general - ISM: general - Galaxy: disc -
Galaxy: stellar content - Galaxy: structure
Abstract:
We present the first catalogue of point-source ultraviolet (UV)-excess
sources selected from the UV-Excess Survey of the Northern Galactic
Plane (UVEX). UVEX images the Northern Galactic Plane in the U, g, r
and HeIλ5875 bands in the Galactic latitude range -5<b<+5°.
Through an automated algorithm, which works on a field-to-field basis,
we select blue UV-excess sources in 211 square degrees from the (U-g)
versus (g-r) colour-colour diagram and the g versus (U-g) and g versus
(g-r) colour-magnitude diagrams. The UV-excess catalogue covers the
magnitude range 14<g<22.5, contains 2170 sources and consists of a mix
of white dwarfs, post-common-envelope objects, interacting binaries,
quasars and active galactic nuclei. Two other samples of outliers were
found during the selection: (i) a "subdwarf" sample, consisting of no
less than 9872 candidate metal-poor stars or lightly reddened
main-sequence stars, and (ii) a "purple" sample consisting of 803
objects, most likely a mix of reddened late M giants, T Tauri stars,
planetary nebulae, symbiotic stars and carbon stars. Cross-matching
the selected UV-excess catalogue with other catalogues aids with the
first classification of the different populations and shows that more
than 99 per cent of our selected sources are unidentified sources.
Description:
UVEX is a double-pass survey in the Johsnon-U, Sloan-g, Sloan-r
filters, and a narrow-band filter centered on the HeI5875Å line.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
purple.dat 268 803 'purple' sample: sources blue in (U-g)
and red in (g-r)
subdwarf.dat 268 9872 'subdwarf' sample
uvexcess.dat 268 2170 'UV-excess' catalog
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See also:
http://www.astro.ru.nl/uvex/ : the UVEX Home Page
J/MNRAS/399/323 : Simulated UVEX colors with reddening (Groot+, 2009)
Byte-by-byte Description of file: *.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 24 F5.2 arcsec DEs Declination (J2000)
26- 29 I4 --- UVEX UVEX field
31- 36 F6.3 mag rmag Average r magnitude
38- 42 F5.3 mag e_rmag rms uncertainty in rmag
44- 45 I2 --- MCr [-2/0] Morphology class from r magnitude (1)
47- 52 F6.3 mag gmag Average g magnitude
54- 58 F5.3 mag e_gmag rms uncertainty in gmag
60- 61 I2 --- MCg [-2/0] Morphology class from g magnitude (1)
63- 68 F6.3 mag Umag Average U magnitude
70- 74 F5.3 mag e_Umag rms uncertainty in Umag
76- 77 I2 -- MCU [-2/0] Morphology class from U magnitude (1)
79- 84 F6.3 mag Hemag Average He magnitude (HeI filter at 5875Å)
86- 90 F5.3 mag e_Hemag rms uncertainty in Hemag
92- 93 I2 --- MCHe [-8/1] Morphology class from He magnitude (1)
95- 98 I4 ---- fUVEX UVEX selection flag (2)
100-104 F5.2 mag ind1 (U-g)BlueEdge-(U-g)source-2σ(U-g) (3)
106-110 F5.2 mag ind2 (g-r)BlueEdge-(g-r)source- 2σ(g-r) (4)
112-117 F6.3 mag rmag0 Original r magnitude for direct field
119-123 F5.3 mag e_rmag0 rms uncertainty on rmag
125-126 I2 --- MC0r [-2/0] Direct field r-band morphologic class (1)
128-133 F6.3 mag gmag0 Original g magnitude for direct field
135-139 F5.3 mag e_gmag0 rms uncertainty on gmag
141-142 I2 --- MC0g [-2/0] Direct field g-band morphologic class (1)
144-149 F6.3 mag Umag0 Original U magnitude for direct field
151-155 F5.3 mag e_Umag0 rms uncertainty on Umag
157-158 I2 --- MC0U [-2/1] Direct field U-band morphologic class (1)
160-165 F6.3 mag Hemag0 ? Original He magnitude for direct field
167-171 F5.3 mag e_Hemag0 ? rms uncertainty on Hemag
173-174 I2 --- MC0He [-8/1] Direct field He-band morphologic class (1)
176-181 F6.3 mag rmag2 Original r magnitude for offset field
183-187 F5.3 mag e_rmag2 rms uncertainty on rmag
189-190 I2 --- MC2r [-2/0] Offset field r-band morphologic class (1)
192-197 F6.3 mag gmag2 Original g magnitude for offset field
199-203 F5.3 mag e_gmag2 rms uncertainty on gmag
205-206 I2 --- MC2g [-2/0] Offset field g-band morphologic class (1)
208-214 F7.3 mag Umag2 ?=- Original U magnitude for offset field
216-222 F7.3 mag e_Umag2 rms uncertainty on Umag
224-225 I2 --- MC2U [-2/0] Offset field U-band morphologic class (1)
227-233 F7.3 mag Hemag2 ? Original He magnitude for offset field
235-241 F7.3 mag e_Hemag2 ?=- rms uncertainty on Hemag
243-244 I2 --- MC2He [-2/0] Offset field He-band Morphology class (1)
246-250 F5.2 mag <e_r> Average r magnitude error of the total field
252-256 F5.2 mag <e_g> Average g magnitude error of the total field
258-262 F5.2 mag <e_U> Average U magnitude error of the total field
264-268 F5.2 mag <e_He> Average He magnitude error of the total field
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Note (1): The possible morphology classes are:
-1 = stellar
-2 = probably stellar
0 = noise-like
The other values (-8 and 1) are not explained.
Note (2): UVEX selection flag (1, 2, 4, 32, 64, 512, 1024 or combinations) and
gives information about how the source was selected as follows:
1 = outlier on the blue side of the main-sequence in the (U-g)
versus (g-r) colour-colour diagram
2 = outlier on the blue side of the main sequence in the g
versus (U-g) colour-magnitude diagram
4 = outlier on the blue side of the main-sequence in the g
versus (g-r) colour magnitude diagram
32 = outlier on the purple side of the main sequence in the (U-g)
versus (g-r) colour-colour diagram
64 = outlier on the non-purple side of the main sequence in the (U-g)
versus (g-r) colour-colour diagram
512 = outlier on the blue side of the main sequence in the g
versus (U-g) colour-magnitude diagram that lies more than
0.4mag away from the main-sequence blue edge
1024 = outlier on the blue side of the main sequence in the g
versus (g-r) colour-magnitude diagram that lies more than
0.4mag away from the main-sequence blue edge
Note (3): the difference in (U-g) between source and the blue edge in the
g vs. (U-g) cmd, inclusive the photometric error of the source.
Note (4): the difference in (g-r) between source and the blue edge in the
g vs. (g-r) cmd, inclusive the photometric error of the source.
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History:
Copied at http://www.uvexsurvey.org
(End) Patricia Vannier [CDS] 23-Jul-2012