J/MNRAS/427/679 Deep blank field catalogue (Jimenez-Esteban+, 2012)
Deep blank field catalogue for medium- and large-size telescopes.
Jimenez-Esteban F.M., Cabrera-Lavers A., Cardiel N., Alacid J.M.
<Mon. Not. R. Astron. Soc. 427, 679 (2012)>
=2012MNRAS.427..679J 2012MNRAS.427..679J
ADC_Keywords: Photographic catalog ; Photometry
Keywords: methods: data analysis - methods: numerical - catalogues -
virtual observatory tools
Abstract:
The observation of blank fields, defined as regions of the sky that
are devoid of stars down to a given threshold magnitude, constitutes
one of the most relevant calibration procedures required for the
proper reduction of astronomical data obtained following typical
observing strategies. In this work, we have used the Delaunay
triangulation to search for deep blank fields throughout the whole
sky, with a minimum size of 10-arcmin in diameter and an increasing
threshold magnitude from 15 to 18 in the R band of the USNO-B Catalog
of the United States Naval Observatory. The result is a catalogue with
the deepest blank fields known so far. A short sample of these regions
has been tested with the 10.4m Gran Telescopio Canarias, and it has
been shown to be extremely useful for medium and large size
telescopes. Because some of the regions found could also be suitable
for new extragalactic studies, we have estimated the galactic
extinction in the direction of each deep blank field. This catalogue
is accessible through the Virtual Observatory tool TESELA, and the
user can retrieve - and visualise using Aladin - the deep blank fields
available near a given position in the sky.
Description:
The tables contain the deep blank fields regions obtained from the
triangulation. Data are structured in 4 tables, each corresponding to
a different threshold magnitude: 15, 16, 17 and 18, respectively.
The fifth table contains the short list of selected deep blank fields
for both hemispheres.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 165 77277 Deep blank field catalogue for 15mag threshold
table2.dat 165 6062 Deep blank field catalogue for 16mag threshold
table3.dat 165 332 Deep blank field catalogue for 17mag threshold
table4.dat 165 74 Deep blank field catalogue for 18mag threshold
table5.dat 116 90 Short list of selected deep blank fields
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Byte-by-byte Description of file: table1.dat table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension (J2000)
12- 21 F10.6 deg DEdeg Declination (J2000)
23- 24 I2 h RAh Right ascension (J2000)
26- 27 I2 min RAm Right ascension (J2000)
29- 33 F5.2 s RAs Right ascension (J2000)
35 A1 --- DE- Declination sign
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 45 F4.1 arcsec DEs Declination (J2000)
47- 68 F22.18 deg GLON Galactic longitude (IAU1958)
70- 90 F21.17 deg GLAT Galactic latitude (IAU1958)
92- 96 F5.2 arcmin Radius Deep blank field radius
98-100 I3 --- N17.5 Number of stars brighter than 17.5mag
102-105 I4 --- N22.0 Number of stars brighter than 22.0mag
107-111 F5.2 mag Rmax Rmag of the faintest star in the field
113-117 F5.2 mag Rmin Rmag of the brightest star in the field
119-126 E8.2 cW/m2/nm Flux Integrated flux in the field
(in erg/cm2/s/Å)
128-134 F7.4 mag E(B-V) Interstellar extinction at the center of
the field
136-142 F7.4 mag <E(B-V)> Mean interstellar extinction in the field
144-149 E6.2 mag st<E(B-V)> Standard deviation of the mean interstellar
extinction in the field
151-157 F7.4 mag E(B-V)M Maximum interstellar extinction in the field
159-165 F7.4 mag E(B-V)m Minumum interstellar extinction in the field
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Byte-by-byte Description of file: table5.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- 23 F4.1 arcsec DEs Declination (J2000)
25- 34 F10.6 deg GLON Galactic Longitude (IAU1958)
36- 45 F10.6 deg GLAT Galactic Latitude (IAU1958)
46- 50 F5.2 arcmin Radius DBF radius
52- 54 I3 --- N17.5 Number of stars brighter than 17.5mag
56- 58 I3 --- N22.0 Number of stars brighter than 22.0mag
60- 64 F5.2 mag Rmax Rmag of the faintest star in the field
66- 70 F5.2 mag Rmin Rmag of the brightest star in the field
72- 79 E8.2 cW/m2/nm Flux Integrated flux in the field
(in erg/s/cm2/Å)
81- 87 F7.4 mag E(B-V) Interstellar extinction at the center of
the field
89- 94 E6.4 mag <E(B-V)> Mean interstellar extinction in the field
96-100 E5.2 mag st<E(B-V)> Standard deviation of the mean interstellar
extinction in the field
102-108 F7.4 mag E(B-V)M Maximum interstellar extinction in the field
110-116 F7.4 mag E(B-V)m Minumum interstellar extinction in the field
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(End) Patricia Vannier [CDS] 25-Sep-2012