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A VLA Survey of the First Quadrant of the Galactic Plane at 1.5 [ CATS home ] [ Back to CATS list ] [ ftp ]


1988AJ.....96.1655Garwood+

1.5 GHz VLA Snapshot Survey of Galactic Plane (0d<l <90d)

R. Garwood

Abstract (Garwood et al. 1988)

We presented results from a continuum VLA snapshot survey of the galactic plane in the longitude range 0d < l < 90d at 1.5 GHz. Observations were taken every 0.5^o in longitude at b=0^o. Most fields are complete to about 30 mJy peak density. The positions, peak, and total flux density of 471 compact sources (<30") have been measured. A complete sample of 329 sources is defined. An excess of sources above that expected from extragalactic source counts is seen for l<40 at all flux-densyty intervals. We find 86 compact sources that are within 2.4' of a source in the recent radio recombination-line survey of Lockman (1988). Source counts exlcuding these 86 sources agree with extragalactic source counts for all flux-density and longitude intervals. These may only be a small number of galactic objects present in this survey that remain unidentified as such.
Description
This catalog contains results from a continuum VLA snapshot survey of the galactic plane in the longitude range 0d < l < 90d at 1.5 GHz. The VLA B-array was used with a circular restoring beamwidth of 4.0 arcsec. Observations were taken every 0.5d in longitude at b=0d. Most fields are complete to about 30 mJy peak flux density. Positions, peak, and total flux density have been measured for 471 compact (<30") sources. These data were originally presented in Garwood et al., 1988, AJ, 96, 1655.

Contact C. S. Grant, SAO; stern@cfa.harvard.edu (10/94)
columns 17 rows 471

-----Name----|--Units----|---Description-----------------------------------|
glong         degrees     Galactic longitude (l) of source
 glong                     (real, example: 0.602)
glat          degrees     Galactic latitude (b) of source
 glat                      (real, example: -0.051)
climit        mJy         Completeness limit in mJy
 climit                    (real, example: 109.2)
ra_1950       radians     Right ascension of source in radians (B1950)
 ra_1950                   (real, example: 4.642925)
dec_1950      radians     Declination of source in radians (B1950)
 dec_1950                  (real, example: 0.496202)
ra_1950_deg   degrees     Right ascension of source in degrees (B1950)
 ra_1950_deg               (real, example: 266.019989)
dec_1950_deg  degrees     Declination of source in degrees (B1950)
 dec_1950_deg              (real, example: -27.2803)
ra_2000       radians     Right ascension of source in radians (J2000)
 ra_2000                   (real, example: 4.668108)
dec_2000      radians     Declination of source in radians (J2000)
 dec_2000                  (real, example: -0.496507)
ra_2000_deg   degrees     Right ascension of source in degrees (J2000)
 ra_2000_deg               (real, example: 266.811248)
dec_2000_deg  degrees     Declination of source in degrees (J2000)
 dec_2000_deg              (real, example: -28.447778)
intflux       mJy         Integral 1.5 GHz Flux Density in mJy
 intflux                   (int, example: 177)
pkflux        mJy/beam    Peak 1.5 GHz Flux Density in mJy/beam
 pkflux                    (int, example: 124)
ratio                     Ratio of integral to peak flux density
 ratio                     (real, example: 1.43)
flag1                     Flagged if position is within 15' of pointing
 flag1                     (int, example: 1)
flag2                     Flagged if uncorrected peak flux > than climit
 flag2                     (int, example: 1)
notes                     Notes on the source (char11, example: 'A  H Sgr B2')

General description

1. COLUMNS glong glat

These columns give the galactic longitude and galactic latitude of the fitted source peak position, in degrees.

2. COLUMN climit

This column gives the completeness limit (uncorrected for primary-beam attenuation and bandwidth smearing) corresponding to the field on which the source was found.

3. COLUMNS ra_1950 dec_1950 ra_1950_deg dec_1950_deg ra_2000 dec_2000 ra_2000_deg dec_2000_deg

These columns give the B1950 and J2000 right ascension and declination in radians and in degrees. The J2000 positions are from the catalog, the B1950 positions were precessed in ADS to facilitate multi-catalog searching in Einline. The positions are conservatively estimated to be accurate to within 2".

4. COLUMNS intflux pkflux

These columns give the integral and peak flux densities. Both of these values have been corrected for primary-beam attenuation. The peak value has also been corrected for bandwidth smearing.

5. COLUMN ratio

This column gives the ratio of integral to peak flux density, a useful quantity to indicate how resolved the source is.

6. COLUMNS flag1 flag2

The flag1 column is set to 1 if the source is within 15 arcminutes from the pointing center, otherwise it is set at 0. The flag2 column is set to 1 if the uncorrected source peak flux density is greater than the completeness limit on the field as listed in this table, and is set to 0 otherwise.

7. COLUMN notes

This column gives notes and identifications for the source. The following are some of the abbreviations used:

References

Altenhoff, W.J., Downes, D., Pauls, T., and Schraml, J. 1978, A&AS, 35, 23.
Garwood, R.W., and Dickey, J.M. 1989, Ap.J., 338, 841.
Garwood, R.W., Perley, R.A., Dickey, J.M., and Murray, M.A. 1988, AJ, 96, 1655.
Jones, T.J., Garwood, R.W., and Dickey, J.M. 1988, Ap.J., 328, 559.
Lockman, F.J. 1989, Ap.J.Suppl., 71, 469.
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| GLONG | GLAT |CMPLT| RA (1950)|   DEC   |INTFLX|PKFLUX|RATIO|      NOTES|
|       |      |LIMIT| h  m  s  | d  '  ''| (mJy)|(mJY) |     |           |
|-------|------|-----|----------|---------|------|------|-----|-----------|
| 33.133|-0.092| 23.8|18 49 34.4|+00 04 32|   163|   103|  0.6|L          |
| 33.144|-0.066| 23.8|18 49 30.0|+00 05 51|    85|    48|  0.8|L          |
| 33.498| 0.195| 13.7|18 49 13.5|+00 31 53|   561|   311|  0.8|           |
| 33.915| 0.110| 27.1|18 50 17.5|+00 51 46|   523|   138|  0.8|L          |
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