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1985MNRAS.217..717Baldwin+ I DEC <+80
1988MNRAS.234..919Hales+ II 30<DEC<51; 08.5h<RA<17.5h
1990MNRAS.246..256Hales+ III 05h25m<RA<18h17m, 48<DEC<68
1991MNRAS.251...46Hales+ IV 67<DEC<82; 00h<RA<24h
1993MNRAS.262.1057Hales+ Va 48<DEC<68; 01h34m<RA<06h14m;
1993MNRAS.262.1057Hales+ Vb 48<DEC<68; 17h16m<RA<20h24m;
1993MNRAS.263...25Hales+ VI 30<DEC<51; 22h35m<RA<09h05m;
Summary I:
This catalogue contains the first section of the 6C Cambridge survey of
radio sources at 151 MHz. This part of the survey covers the region
north of a declination of 80 deg. This survey has an angular
resolution of 4.2 arcmin x 4.2 arcmin x cosec(dec) (half-power at map
center) and a limiting flux density of 120mJy at 151 MHz. Data include
the source positions (B1950), peak flux density, integrated flux density,
and contour map number. This part of the survey contains 1761 sources.
Summary II:
This catalogue contains the second section of the 6C Cambridge survey
of radio sources at 151 MHz, covering the region from 30 deg to 51 deg
in declination and between 8h 30m and 17h 30m in right ascension. The
survey has an angular resolution of 4.2 arcmin x 4.2 arcmin x cosec(dec).
Data include the source positions (B1950), peak flux density, integrated
flux density, contour map panel number and contour map field names.
Its limiting flux density depends weakly on right ascension and
strongly on declination and is 190 mJy in the central part of the
declination strip but rises to over 400 mJy near its northern and
southern boundaries. This part of the survey contains 8278 sources,
covering an area of 2030 square degrees.
Summary III:
This catalogue contains the third section of the 6C Cambridge survey of
radio sources at 151 MHz. This part of the survey covers the region
from 48 deg to 68 deg in declination and between 5h 25m and 18h 17m
in right ascension. This survey has an angular resolution of
4.2 arcmin x 4.2 arcmin x cosec(dec) (half-power at map center). The
limiting flux density varies between 160 mJy to 600 mJy as a function
of map and declination. Data include the source positions (B1950),
peak flux density, integrated flux density, contour map panel number and
contour map field names. This part of the survey contains 8749 sources,
covering an area of 1950 square degrees. This catalogue slightly overlaps
the Hales et al. (1988) survey.
Description 6C4
This catalogue contains the fourth part of the 6C Cambridge survey of
radio sources at 151 MHz, covering the region from 67deg to 82deg and
from 0h to 24h in right ascension. The survey has an angular resolution
of 4.2'x4.2'x cosec(decl) and reaches a limiting peak flux density of
160 mJy in the present zone with completeness achieved at 400 mJy on
the best maps and at about 800 mJy on the worst. This part of the survey
covers 1440 sq. degrees and contains 5421 sources. See Paper II (Hales
et al. 1988, MNRAS, 234, 919) for a full explanation of observation
and analysis methods.
The present survey zone overlaps that covered in Paper I (rad_6ci) over
the range 80d < dec < 82d and also that covered in Paper III (rad_6ciii)
over the range 67d < dec < 68d, 05h25m < RA < 18h17m. We recommend
consultation of both this present paper and the alternative in these regions.
These data were originally presented in Hales, et al. 1991, MNRAS,
251, 46.
Short Descriptions
1 ra radians Right ascension of source in radians (B1950) (real, example: 0.059283)
2 dec radians Declination of source in radians (B1950) (real, example: 1.378873)
3 ra_deg degrees Right ascension of source in degrees (B1950) (real, example: 3.396667)
4 dec_deg degrees Declination of source in degrees (B1950) (real, example: 79.003611)
5 pkfl Jy Peak flux density (real, example: 16.1)
6 intf Jy Integrated flux density (real, example: 16.64)
7 panl Panel number of contour map (int, example: 18)
8 mapra RA of map containing source (char7, example: '0100+75')
9 integ_flg Integrated flux flag (char1, example: '-')
1. COLUMNS ra dec ra_deg dec_deg
The first two columns contain the B1950 position of the source in
radians; the second two columns contain the B1950 position in degrees.
Positional uncertainties have been estimated to correspond to
approximately 4"/S in right ascension and 4"(cos. decl.)/S for
declination, where S is the apparent peak flux density before
primary beam correction in Jy (Note that the peak flux density given
in the pkfl column has been corrected for the primary beam).
Example (ra) (real): 0.059283
Example (dec) (real): 1.378873
Example (ra_deg) (real): 3.396667
Example (dec_deg) (real): 79.003611
2. COLUMNS pkfl intf
These columns give the peak flux density and the integrated flux
density at 151 MHz in Jy. Flux densities are on the scale of Roger,
Bridle, and Costain (RBC, 1973) (see Rees 1990 for the compatibility
of the RBC and the Baars et al. 1977 scale). Both the peak flux density
and the integrated flux densities required a primary-beam correction,
and the peak flux densities required a further correction for the
reduction in peak brightness due to chromatic aberration. The latter
correction is dependent on the distance of the source from the field
center.
Integrated flux densities were carried out for sources with
apparent flux densities above 513 mJy. The integration was carried
out to a limiting level of 10% of the fitted peak (or to 110 mJy for
sources having apparent flux densities < 1.1 Jy). For the right half
of the field 1900+75, the threshold to qualify for integration was
raised to 1.54 Jy and for the apex of the field 2200+75 to 0.96 Jy,
with limiting level for both cases of 10 percent or 154 mJy for sources
having apparent peak flux densities < 1.54 Jy. Note that for unresolved
sources the integrated flux value can fall below the peak value.
See the paper for details on the error distribution.
Example (pkfl) (real): 16.1
Example (intf) (real): 16.64
3. COLUMNS panl mapra
The panl column contains the panel number of the contour map in which
the source appears in the survey. The mapra column contains the name
of the field in which the source appears. There are eight fields in
this part of the survey; 0100+75, 0400+75, 0700+75, 1000+75, 1300+75,
1600+75, 1900+75 and 2200+75. Each of the eight fields is divided into
32 contour panels. The panel number and the map tells the user where
to look up the source of interest in the published contour map.
The user is reminded that the present survey zone overlaps that
covered in Paper I (rad_6ci) over the range 80d < dec < 82d and also
that covered in Paper III (rad_6ciii) over the range 67d < dec < 68d,
05h25m < RA < 18h17m. We recommend consultation of both this present
paper and the alternative in these regions. In most cases the crossover
in sensitivity lies within the overlap, but at a few right ascensions
the other paper will contain the more sensitive data throughout.
Example (panl) (int): 18
Example (mapra) (char7): '0100+75'
4. COLUMN integ_flg
This column gives the integrated flux flag, a flag which indicates why
the integrated flux was not calculated. If the column is marked with
a dash ('-'), the peak flux was not strong enough to calculate the
integrated flux. If the column is marked with an asterisk ('*'), the
peak flux was strong enough to qualify for integration, but it has
been integrated into a brighter adjoining peak. This may either be
part of a complex source so that the aggregate integrated value
represents the whole source, or it may be an unrelated source which
confuses and correspondingly increases the integrated flux of the
adjoining brighter source.
Example (integ_flg) (char1): '-'
References
Baars, et.al 1977, Astr. Ap., 61, 99.
Baldwin, J.E., Boysen, R.C., Hales, S.E.G, Jennings, J.E., Waggett, P.C.,
Warner, P.J., and Wilson, D.M.A. 1985, MNRAS, 217, 717 (Paper I).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1988, MNRAS, 234, 919
(Paper II).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1990, MNRAS, 246, 256
(Paper III).
Hales, S.E.G., Mayer, C.J., Warner, P.J., and Baldwin, J.E. 1991,
MNRAS, 251, 46.
Rees, 1990, MNRAS, 243, 637.
Roger, R.S., Bridle, A.H., and Costain, C.H. 1973, A.J., 78, 1030.
Filename
http://adswww.colorado.edu/catalogs/rad_6civ.html
Origin submitted by S.E.G. Hales Date 20-Oct-1992
The 6C V Survey (151 MHz) (01.5-06.25h, 17.25-20.4h; 48-68deg)
Description 6C5
This catalogue contains the fifth part of the 6C Cambridge survey of
radio sources at 151 MHz, covering the region from 48deg to 68deg and
covering two zones of right ascension; from 01h34m to 06h14m and from
17h16m to 20h24m. The limiting flux density is generally 170 mJy.
This survey complements Paper III (Hales et al. 1990) of the series on
the 6C survey of radio sources (see rad_6ciii), presenting the remaining
parts of the observations of the declination strip between 48 and 68
degrees, and extending coverage into the regions of lower Galactic
latitude at those declinations. Note that the present 6CV maps are of
lower quality than the previously published 6CIII maps of the rest of
the declination strip. The observations made and the data reduction
methods and other conventions adopted for the strip are described in
Paper III. Since both regions contain some overlap with the regions
covered in Paper III, 396 sources have alternative entries in that list.
Furthermore, the declination range from 67 deg to 68 deg is also covered
in Paper IV of this series (see rad_6civ).
This survey contains 3458 sources, originally presented in
Hales, et al. 1993, MNRAS, 262, 1057.
1 ra radians Right ascension of source in radians (B1950) (real, example: 0.620704)
2 dec radians Declination of source in radians (B1950) (real, example: 1.033511)
3 ra_deg degrees Right ascension of source in degrees (B1950) (real, example: 35.563747)
4 dec_deg degrees Declination of source in degrees (B1950) (real, example: 59.215833)
5 pkfl Jy Peak flux density (real, example: 0.78)
6 intf Jy Integrated flux density (real, example: 0.75)
7 panl Panel number of contour map (int, example: 10)
8 mapra RA of map containing source (char7, example: '0300+58')
9 integ_flg Integrated flux flag (char1, example: '*')
1. COLUMNS ra dec ra_deg dec_deg
The first two columns contain the B1950 position of the source in
radians; the second two columns contain the B1950 position in degrees.
Positional uncertainties are comparable to those quoted for 6C-III
(i.e. about 5"/S in right ascension and 5"*cosec(decl.)/S in declination)
only in the good quality areas of the maps, while they are expected to be
more severe in the contaminated areas, where S is the apparent peak flux
density before primary beam correction in Jy (note that the peak flux
density given in the pkfl column has been corrected for the primary beam).
Example (ra) (real): 0.620704
Example (dec) (real): 1.033511
Example (ra_deg) (real): 35.563747
Example (dec_deg) (real): 59.215833
2. COLUMNS pkfl intf
These columns give the peak flux density and the integrated flux
density at 151 MHz in Jy. Flux densities are on the scale of Roger,
Bridle, and Costain (RBC, 1973) (see Rees 1990 for the compatibility
of the RBC and the Baars et al. 1977 scale). Both the peak flux density
and the integrated flux densities required a primary-beam correction,
and the peak flux densities required a further correction for the
reduction in peak brightness due to chromatic aberration. The latter
correction is dependent on the distance of the source from the field
center.
Note that these new maps are of lower quality than those already
published due to problems caused by their proximity to Cyg A and Cas A.
The limits on apparent flux density (i.e. fitted peak flux
density before primary-beam correction) used in compiling the source
list were given by
S_peak >= (175-4.0|DEC_date - 58|) mJy
on maps 0300+58 and 0500+58, and
S_peak >= (185-4.0|DEC_date - 58|) mJy
on map 1900+58, where || denotes an absolute value and DEC_date is
the source declination in degrees at the observation date.
Example (pkfl) (real): 0.78
Example (intf) (real): 0.75
3. COLUMNS panl mapra
The panl column contains the panel number of the contour map in which
the source appears in the survey. The mapra column contains the name
of the field in which the source appears. There are three fields in
this part of the survey: 0300+58, 0500+58, and 1900+58. Each of the
fields is divided into 32 contour panels. A panel number listed
with a negative sign indicates that the data are accommodated at the
location but come from another map or area of sky. The panel number
and the map tells the user where to look up the source of interest in
the published contour map.
The user is reminded that the present survey zone overlaps that
covered in Paper III (rad_6ciii) over the range 48d < dec < 68d,
05h25m < RA < 18h17m, and also that covered in Paper IV (rad_6civ)
over the range 67d < dec < 68d. We recommend consultation of both
this present paper and the alternative in these regions.
Example (panl) (int): 10
Example (mapra) (char7): '0300+58'
4. COLUMN integ_flg
This column gives the integrated flux flag, a flag which indicates why
the integrated flux was not calculated. If the column is marked with
a dash ('-'), the peak flux was not strong enough to calculate the
integrated flux. If the column is marked with an asterisk ('*'), the
peak flux was strong enough to qualify for integration, but it has
been integrated into a brighter adjoining peak. This may either be
part of a complex source so that the aggregate integrated value
represents the whole source, or it may be an unrelated source which
confuses and correspondingly increases the integrated flux of the
adjoining brighter source.
Example (integ_flg) (char1): '*'
References
Baars, et.al 1977, Astr. Ap., 61, 99.
Baldwin, J.E., Boysen, R.C., Hales, S.E.G, Jennings, J.E., Waggett, P.C.,
Warner, P.J., and Wilson, D.M.A. 1985, MNRAS, 217, 717 (Paper I).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1988, MNRAS, 234, 919
(Paper II).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1990, MNRAS, 246, 256
(Paper III).
Hales, S.E.G., Mayer, C.J., Warner, P.J., and Baldwin, J.E. 1991,
MNRAS, 251, 46 (Paper IV).
Hales, S.E.G., Masson, C.R., Warner, P.J., Baldwin, J.E., and Green, D.A.
1993, MNRAS, 262, 1057 (Paper V).
Rees, 1990, MNRAS, 243, 637.
Roger, R.S., Bridle, A.H., and Costain, C.H. 1973, A.J., 78, 1030.
http://adswww.colorado.edu/catalogs/rad_6cv.html
Origin submitted by S.E.G. Hales
Date 01-Dec-1993
Columns 9 Rows 3458
The 6C VI Survey (151 MHz) (0h-09h, 22.5h-24h; 30deg-51deg)
Description 6C6
This catalogue contains the sixth part of the 6C Cambridge survey of
radio sources at 151 MHz, covering the region from 30deg to 51deg and
covering two zones of right ascension; from 00h to 09h05m and from
22h35m to 24h. The survey complements Paper II (Hales et al. 1988)
of the series on the 6C survey of radio sources (see rad_6cii),
presenting the remaining parts of the observations of the declination
strip between 30 and 51 degrees, and extending coverage into the
regions of lower Galactic latitude at those declinations. Note that
the present 6CVI maps are of lower quality than the previously published
6CII maps of the rest of the declination strip. The observations made
and the data reduction methods and other conventions adopted for the
strip are described in that paper. Since both regions contain some
overlap with the regions covered in Paper II, 199 sources have
alternative entries in that list. Furthermore, the area between
48 deg and 51 deg, from ~2h to 09h05m is also covered in Papers III
and V of this series.
This survey contains 6752 sources, covering 2440 square degrees.
The data were originally presented in Hales, et al. 1993, MNRAS,
263, 25.
1. COLUMNS ra dec ra_deg dec_deg
The first two columns contain the B1950 position of the source in
radians; the second two columns contain the B1950 position in degrees.
Positions have been systematically adjusted (by 0.6s in RA and
by 4"*cosec(dec)/S in declination) to agree with known positions of
bright sources. Separate constant right ascension corrections were
obtained for each map, as well as a separate declination correction
varying linearly with the declination. The right ascension correction
ranged from 0.18s to 0.79s and the most severe declination correction
reached -25 arcsec.
Example (ra) (real): 0.171849
Example (dec) (real): 0.652724
Example (ra_deg) (real): 9.846250
Example (dec_deg) (real): 37.398333
2. COLUMNS pkfl intf
These columns give the peak flux density and the integrated flux
density at 151 MHz in Jy. Flux densities are on the scale of Roger,
Bridle, and Costain (RBC, 1973) (see Rees 1990 for the compatibility
of the RBC and the Baars et al. 1977 scale). Both the peak flux density
and the integrated flux densities required a primary-beam correction,
and the peak flux densities required a further correction for the
reduction in peak brightness due to chromatic aberration. The latter
correction is dependent on the distance of the source from the field
center.
Note that these new maps are of lower quality than those already
published due to problems caused by their proximity to Cyg A, Cas A,
and the Crab nebula, and incomplete ring structures due to the presence
of the Sun on isolated hour angles (especially those daytime observations
made near the summer solstice).
Integrated flux densities were derived for sources with apparent
flux densities above 1 Jy (2 Jy for the top panels of the map 2340+41),
to avoid severe runaway problems). The integration was carried out to
a limiting level of 10 percent of the fitted peak (or 207 mJy for sources
having apparent flux densities < 2.07 Jy). For sources in badly
contaminated regions, the integrated flux density may be significantly
boosted or depleted relative to the peak flux density because of inherent
problems with the determination of the local zero level, as well as the
obvious possibility of confusion with the contaminating feature.
Example (pkfl) (real): 1.65
Example (intf) (real): 1.58
3. COLUMNS panl mapra
The panl column contains the panel number of the contour map in which
the source appears in the survey. The mapra column contains the name
of the field in which the source appears. There are six fields in
this part of the survey: 0120+41, 0300+41, 0440+41, 0620+41, 0800+41,
and 2340+41. Each of the fields is divided into 32 contour panels.
A panel number listed with a negative sign indicates that the data are
accommodated at the location but come from another map or area of sky.
The panel number and the map tells the user where to look up the source
of interest in the published contour map.
The user is reminded that the present survey zone overlaps that
covered in Paper II (rad_6cii) over the range 30d < dec < 51d,
08h30m < RA < 17h30m, and also that covered in Papers III/IV (rad_6ciii
and rad_6cv) over the range 48d < dec < 51d. We recommend consultation
of both this present paper and the alternative in these regions.
Example (panl) (int): 23
Example (mapra) (char7): '0120+41'
4. COLUMN integ_flg
This column gives the integrated flux flag, a flag which indicates why
the integrated flux was not calculated. If the column is marked with
a dash ('-'), the peak flux was not strong enough to calculate the
integrated flux. If the column is marked with an asterisk ('*'), the
peak flux was strong enough to qualify for integration, but it has
been integrated into a brighter adjoining peak. This may either be
part of a complex source so that the aggregate integrated value
represents the whole source, or it may be an unrelated source which
confuses and correspondingly increases the integrated flux of the
adjoining brighter source.
Example (integ_flg) (char1): '*'
References
Baars, et.al 1977, Astr. Ap., 61, 99.
Baldwin, J.E., Boysen, R.C., Hales, S.E.G, Jennings, J.E., Waggett, P.C.,
Warner, P.J., and Wilson, D.M.A. 1985, MNRAS, 217, 717 (Paper I).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1988, MNRAS, 234, 919
(Paper II).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1990, MNRAS, 246, 256
(Paper III).
Hales, S.E.G., Mayer, C.J., Warner, P.J., and Baldwin, J.E. 1991,
MNRAS, 251, 46 (Paper IV).
Hales, S.E.G., Masson, C.R., Warner, P.J., Baldwin, J.E., and Green, D.A.
1993, MNRAS, 262, 1057 (Paper V).
Hales, S.E.G., Baldwin, J.E., and Warner, P.J. 1993, MNRAS, 263, 25
(Paper VI).
Rees, 1990, MNRAS, 243, 637.
Roger, R.S., Bridle, A.H., and Costain, C.H. 1973, A.J., 78, 1030.
vFilename
http://adswww.colorado.edu/catalogs/rad_6cvi.html
submitted by S.E.G. Hales
Date 01-Dec-1993
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