J/AJ/153/113 The CGPS 1420 MHz catalog of compact sources (Taylor+, 2017)
A 1420 MHz catalog of compact sources in the northern Galactic plane. Taylor A.R., Leahy D.A., Tian W.W., Sunstrum C., Kothes R., Landecker T.L., Ransom R.R., Higgs L.A. <Astron. J., 153, 113-113 (2017)> =2017AJ....153..113T (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio continuum ; Radio sources Keywords: catalogs - radio continuum: general - surveys Abstract: We present a catalog of compact sources of radio emission at 1420MHz in the northern Galactic plane from the Canadian Galactic Plane Survey. The catalog contains 72758 compact sources with an angular size less than 3' within the Galactic longitude range 52°<l<192° down to a 5σ detection level of ∼1.2mJy. Linear polarization properties are included for 12368 sources with signals greater than 4σQU in the Canadian Galactic Plane Survey (CGPS) Stokes Q and U images at the position of the total intensity peak. We compare CGPS flux densities with cataloged flux densities in the Northern VLA Sky Survey catalog for 10897 isolated unresolved sources with CGPS flux density greater than 4mJy to search for sources that show variable flux density on timescales of several years. We identify 146 candidate variables that exhibit high fractional variations between the two surveys. In addition, we identify 13 candidate transient sources that have CGPS flux density above 10mJy but are not detected in the Northern VLA Sky Survey. Description: The Canadian Galactic Plane Survey (CGPS) mapped the principal constituents of the interstellar medium (ISM) with high angular resolution, inspired by the view that understanding the ISM requires knowledge of all its constituents. The Synthesis Telescope at the Dominion Radio Astrophysical Observatory (the DRAO ST) provided arcminute-resolution images of the radio continuum and atomic-hydrogen line emission. The CGPS is presented in Taylor et al. 2003 (Cat. VI/128), where details are also given of companion surveys that imaged the molecular and dust constituents of the ISM. The CGPS DRAO radio continuum observations provide images of Stokes I, Q, and U in four 7.5MHz sub-bands spanning 35MHz, centered on 1420MHz. The observations were carried out in three phases beginning in 1995 Apr and ending in 2009 Feb. The CGPS DRAO image products are 5.12°*5.12° images mosaicked from overlapping Synthesis Telescope fields. The images are available through the Canadian Astronomy Data Centre (www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/cgps). The complete survey is comprised of 85 such mosaics. We constructed the radio source catalog from these images using an automated source finding algorithm, FINDSRC, developed as part of the DRAO export software package (Higgs et al. 1997ASPC..125...58H). We present the Canadian Galactic Plane Survey (CGPS) 1420MHz compact source catalog covering 1464 square degrees and spanning a range of 140° of Galactic longitude between 52°<l<192°. Our survey is comparable in resolution and sensitivity to the NRAO VLA Sky Survey (NVSS; Condon et al. 1998, Cat. VIII/65); the flux density scale and source positions of the CGPS at 1420MHz were tied to the NVSS. From the 72758 sources in the CGPS catalog we identified 52876 that have counterparts in the NVSS within 60'' of the CGPS position. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 127 72787 Canadian Galactic Plane Survey (CGPS) 1420MHz source catalog table3.dat 53 146 *Variable sources detected in Canadian Galactic Plane Survey (CGPS) and NRAO VLA Sky Survey (NVSS) table4.dat 53 13 *Strong Canadian Galactic Plane Survey (CGPS) sources not detected in the NRAO VLA Sky Survey (NVSS)
Note on table3.dat: Candidate variables that exhibit high fractional variations between the Canadian Galactic Plane Survey (CGPS; see Taylor et al. 2003, Cat. VI/128) and the NRAO VLA Sky Survey (NVSS; Condon et al. 1998, Cat. VIII/65). Note on table4.dat: Candidate transient sources that have Canadian Galactic Plane Survey (CGPS; see Taylor et al. 2003, Cat. VI/128) flux density above 10mJy but are not detected in the NRAO VLA Sky Survey (NVSS; Condon et al. 1998, Cat. VIII/65).
See also: VI/128 : Log of CGPS exposures (Taylor+, 2003-) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) J/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009) J/ApJS/145/213 : Rotation measures of compact sources in CGPS (Brown+, 2003) www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/cgps : Canadian Galactic Plane Survey Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CGPS] 6- 19 A14 --- CGPS Canadian Galactic Plane Survey (CGPS) identifier (JHHMMSS+DDMMSS) 21- 29 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) 31- 35 F5.2 deg e_RAdeg The 1σ uncertainty in RAdeg 37- 44 F8.5 deg DEdeg Declination in decimal degrees (J2000) 46- 49 F4.1 deg e_DEdeg The 1σ uncertainty in DEdeg 51- 56 F6.1 mJy SI [1/9516.5] Integrated Stokes I flux density (SI) 58- 64 F7.2 mJy e_SI [0.2/2613.2] The 1σ uncertainty in SI 66- 71 F6.1 mJy/beam SP [1/6228.7] Peak Stokes I intensity (SP) 73- 79 F7.2 mJy/beam e_SP [0.2/2613.2] The 1σ uncertainty in SP 81- 85 F5.2 mJy sigma [0/48.3]?=0 Average rms (σQU) (1) 87- 91 F5.1 mJy/beam P [0/295.9] Bias corrected polarized intensity (2) 93- 97 F5.2 mJy/beam e_P [0.11/19]?=0 The 1σ uncertainty in P 99-101 I3 deg PA1 [-90/89] Polarization position angle 103-107 F5.1 arcsec MajAxis [0.4/179.9]?=0 Deconvolved major axis (σmaj) (3) 109-112 F4.1 arcsec e_MajAxis [0.1/36.6]?=0 The 1σ uncertainty in MajAxis 114-118 F5.1 arcsec MinAxis [0.3/151.2]?=0 Deconvolved minor axis (σmin) (3) 120-123 F4.1 arcsec e_MinAxis [0.1/29.2]?=0 The 1σ uncertainty in MinAxis 125-127 I3 deg PA2 [1/180]?=0 Deconvolved major axis position angle with respect to North (J2000)
Note (1): Around the position of the source in the Q and U images. Note (2): In the case of detected polarized emission. Note (3): Of the Stokes I emission. The deconvolved source dimensions are listed as zero if the source is classed as unresolved. The beam dimensions at the location of the source can be calculated using Equation (1): bmajor*bminor=49''cosecδ*49'', where bmajor and bminor are respectively in the decl. and R.A. directions.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CGPS] 6- 19 A14 --- CGPS Canadian Galactic Plane Survey (CGPS) identifier (JHHMMSS+DDMMSS) 21- 25 F5.1 mJy SCGPS [4.3/736.6] CGPS integrated Stokes I flux density (SCGPS) 27- 30 F4.1 mJy e_SCGPS [0.3/21.5] Uncertainty in SCGPS 32- 36 F5.1 mJy SNVSS [2.2/495] NRAO VLA Sky Survey (NVSS) integrated Stokes I flux density (SNVSS) 38- 41 F4.1 mJy e_SNVSS [0.4/14.9] Uncertainty in SNVSS 43- 47 F5.2 --- F [-0.8/1.4] Change in flux density between CGPS & NVSS (1) 49- 53 F5.2 --- V [-5.6/10.5] Variability index (2)
Note (1): As a fraction of the mean flux density measured between the two surveys, F=2[(SCGPS-SNVSS)/(SCGPS+SNVSS)]. A change in flux density by a factor of 2 results in F=±0.67. Note (2): We identify as variables sources those for which: V=(F-FMED)/e_F>4, where FMED is the median value of F for population.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [CGPS] 6- 19 A14 --- CGPS Canadian Galactic Plane Survey (CGPS) identifier (JHHMMSS+DDMMSS) 21- 24 F4.1 mJy SCGPS [10/24.8] CGPS integrated Stokes I intensity (SCGPS) 26- 28 F3.1 mJy e_SCGPS [0.4/1.5] Uncertainty in SCGPS 30- 53 A24 --- Com Comment
History: From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 10-Jul-2017
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