J/other/PASA/37.29 POGS-II ExGal catalog (Riseley+, 2020) ================================================================================ The POlarised GLEAM Survey (POGS). II: Results from an all-sky rotation measure synthesis survey at long wavelengths. Riseley C.J., Galvin T.J., Sobey C., Vernstrom T., White S.V. Zhang X., Gaensler B.M., Heald G., Anderson C.S., Franzen T.M.O., Hancock P.J., Hurley-Walker N., Lenc E., Van Eck C.L. =2020PASA...37...29R (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Surveys ; Active gal. nuclei ; Pulsars ; Radio continuum ; Polarization Keywords: polarisation - surveys - radio continuum: general - galaxies: active - pulsars Abstract: The low-frequency linearly polarised radio source population is largely unexplored. However, a renaissance in low-frequency polarimetry has been enabled by pathfinder and precursor instruments for the Square Kilometre Array. In this second paper from the POlarised GaLactic and Extragalactic All-Sky MWA Survey-the POlarised GLEAM Survey, or POGS-we present the results from our all-sky MWA Phase I Faraday Rotation Measure survey. Our survey covers nearly the entire Southern sky in the Declination range -82{deg} to +30{deg} at a resolution between around three and seven arcminutes (depending on Declination) using data in the frequency range 169-231MHz. We have performed two targeted searches: the first covering 25489 square degrees of sky, searching for extragalactic polarised sources; the second covering the entire sky South of Declination +30{deg}, searching for known pulsars. We detect a total of 517 sources with 200MHz linearly polarised flux densities between 9.9mJy and 1.7Jy, of which 33 are known radio pulsars. All sources in our catalogues have Faraday rotation measures in the range -328.07rad/m^2^ to +279.62rad/m^2^. The Faraday rotation measures are broadly consistent with results from higher-frequency surveys, but with typically more than an order of magnitude improvement in the precision, highlighting the power of low-frequency polarisation surveys to accurately study Galactic and extragalactic magnetic fields. We discuss the properties of our extragalactic and known-pulsar source population, how the sky distribution relates to Galactic features, and identify a handful of new pulsar candidates among our nominally extragalactic source population. Description: The POGS-II catalogue contains newly-detected linearly-polarised sources found in MWA observations performed as part of the GLEAM survey. This catalogue draws also on the GLEAM catalogue (Hurley-Walker et al., 2017MNRAS.464.1146H, Cat. VIII/100) for continuum identifications, plus ancillary catalogues (predominantly AllWISE) for cross-identifications with the literature and host identification. Note that table is designed to follow the RMTable format (Van Eck et al., in prep.) The POGS-II pulsar catalogue contains known pulsars detected in linear polarisation, found in MWA observations performed as part of the GLEAM survey. This catalogue draws also on the GLEAM Extragalactic catalogue (Hurley-Walker et al., 2017MNRAS.464.1146H, Cat. VIII/100) and the GLEAM II: Galactic Plane catalogue (Hurley-Walker et al., 2019PASA...36...47H, VIII/102) for continuum identifications, plus the ATNF Pulsar Catalogue (Manchester et al., 2005AJ....129.1993M, B/psr) for cross-identifications. Note that table is designed to follow the RMTable format (Van Eck et al., in prep.) File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file catalog.dat 616 484 POGS-II Extragalactic Catalogue pulsar.dat 377 33 POGS-II Pulsar Catalogue -------------------------------------------------------------------------------- See also: VII/259 : 6dF galaxy survey final redshift release (Jones+, 2009) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VIII/78 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2006) VIII/100 : GaLactic and Extragalactic All-sky MWA survey (GLEAM) (Hurley-Walker+,2016) VIII/102 : GLEAM II. Galactic plane (Hurley-Walker+, 2019) VIII/105 : The GLEAM 4-Jy (G4Jy) Sample (White+, 2020) J/ApJ/702/1230 : Rotation measure image of the sky (Taylor+, 2009) J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017) Byte-by-byte Description of file: catalog.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Name Name of source belonging to the POGS extragalactic catalogue, POGSII-EG-NNN (catalog_id) 15- 27 F13.9 deg RAdeg Right Ascension for centroid of polarised component (J2000) (ra) 29- 42 F14.10 deg DEdeg Declination for centroid of polarised component (J2000) (dec) 44- 52 F9.5 deg GLON Galactic Longitude for centroid of polarised component (l) 54- 62 F9.5 deg GLAT Galactic Latitude for centroid of polarised component (b) 64- 72 E9.5 deg epos Uncertainty on centroid (pos_err) 74- 83 F10.5 rad/m2 RM Rotation Measure of polarised component (rm) 85- 94 F10.7 rad/m2 e_RM Uncertainty in Rotation Measure of polarised component (rm_err) 96 A1 --- complexFlag [N] Binary Y/N indicating whether the source is Faraday-complex (complex_flag) 98-107 A10 --- complexTest [Inspection] Method used to determine Faraday complexity (complex_test) 109-131 A23 --- rm-method [RM Synthesis - Pol. Int.] Method used to determine Rotation Measure (rm_method) 133-141 A9 --- ionosphere [RMextract] Method used to correct for ionospheric Faraday rotation (ionosphere) 143 I1 --- Ncomp [1] Number of polarised components detected (Ncomp) 145-164 F20.17 Jy stokesI Stokes I flux density at reference frequency refFreqI (stokesI) 166-185 F20.18 Jy e_stokesI Uncertainty in Stokes I flux density at reference frequency (stokesI_err) 187-192 F6.3 --- SpIndex Stokes I spectral index (spectral_index) 194-198 F5.3 --- e_SpIndex Uncertainty in Stokes I spectral index (spectral_index_err) 200-204 E5.1 Hz refFreqI Reference frequency for Stokes I and spectral index properties (reffreq_I) 206-216 F11.9 Jy Polint Polarised intensity at refFreqpol (polint) 218-229 F12.10 Jy e_Polint Uncertainty in polarised intensity at reffreqpol (polint_err) 231-249 A19 --- Pol-bias Method for correcting for polarisation bias (2012PASA...29..214G) (pol_bias) 251-254 A4 --- Flux-Type [Peak] Type of flux density measurement reported (Peak/Integrated) (flux_type) 256-276 F21.19 --- fracpol Fractional polarisation at refFreqpol (fraction) (fracpol) 278-298 E21.19 --- e_fracpol Uncertainty in fractional polarisation at refFreqpol (fraction) (fracpol_err) 300-311 E12.8 Hz refFreqpol Reference frequency at which polarisation properties were derived (reffreq_pol) 313-319 F7.5 deg beamMaj Beam major axis (beam_maj) 321-327 F7.5 deg beamMin Beam minor axis (beam_min) 329-333 F5.1 deg beamPA Beam position angle (beam_pa) 335-339 E5.1 Hz refFreqbeam Reference frequency at which beamMaj, beamMin, beamPA were measured (reffreq_beam) 341-346 E6.2 Hz minFreq Lowest frequency used to extract polarisation properties (minfreq) 348-353 E6.2 Hz maxFreq Highest frequency used to extract polarisation properties (maxfreq) 355-361 F7.1 Hz ChanWidth Channel width used to extract polarisation properties (channelwidth) 363-366 I4 --- Nchan Number of channels that were used when extracting pol properties (Nchan) 367 I1 --- noise-chan ? rms noise measured in channel images (noise_chan) 368-370 A3 --- Tel [MWA] Telescope used (telescope) 372-390 A19 --- Cat [2020PASA...37...29R] Bibcode reference for polarisation catalogue (catalog) 392-410 A19 --- dataref [2015PASA...32...25W] Bibcode reference for original data (dataref) 412-435 A24 --- dataId Radio continuum cross-id from GLEAM (GLEAM JHHMMSS+DDMMSS) or TGSS (TGSSADR JHHMMSS.s+DDMMSS) (data_id) 437-446 A10 --- G4JyId Cross-id from the GLEAM 4Jy Sample, G4Jy NNNNA (G4Jy_id) 448 A1 --- Morph [SDTC] Continuum morphology (Morphology) (1) 450-469 F20.18 Jy/beam rms-I ? Local rms noise in Stokes I (RMS_I) 471-491 F21.19 Jy/beam rms-P Local rms noise in linear polarisation (RMS_P) 493-505 A13 --- NVSSRMAss Cross-match in the NVSS RM catalogue, HHMMSS+DDMMSS (NVSS-RM_assoc) 507-512 F6.1 rad/m2 NVSSRM ? 1.4GHz NVSS rotation measure (NVSS-RM) 514-517 F4.1 rad/m2 e_NVSSRM ? Uncertainty in NVSS rotation measure (NVSS-RM_err) 519-537 A19 --- SPASSRMAss Cross-match in the S-PASS/ATCA rotation measure catalogue, NVSSJHHMMSS+DDMMSS, PKSBHHMM+DDd or SPASSJHHMMSS+DDMMSS (SPASS-RM_assoc) 539-545 F7.2 rad/m2 SPASSRM ? 2.1GHz S-PASS/ATCA rotation measure (SPASS-RM) 547-551 F5.2 rad/m2 e_SPASSRM ? Uncertainty in S-PASS/ATCA rotation measure (SPASS-RM_err) 553 I1 --- SPASSRMComp [1/5]? Number of rotation measure components measured at 2.1GHz in the S-PASS/ATCA rotation measure catalogue (SPASS-RM_comp) 555 A1 --- HostFlag [imu] Flag for the type of host-galaxy identification (HostFlag) (2) 557-575 A19 --- HostID Name of the host galaxy in AllWISE (JHHMMSS.ss+DDMMSS.s) (HostID) 580-586 A7 --- HostCat Catalogue from which HostID is drawn (WISE, AllWISE) (HostCat) 588-594 F7.5 --- Hostz ? Redshift of host galaxy (HostRedshift) 596-606 F11.6 rad/m2 RMgal Galactic Foreground rotation measure (rm_gal) 608-616 F9.6 rad/m2 e_RMgal Uncertainty in Galactic Foreground rotation measure (rm_gal_err) -------------------------------------------------------------------------------- Note (1): Morphology as follows: S = the radio continuum counterpart has simple (typically compact) morphology at higher resolution (TGSS-ADR1/SUMSS/NVSS) D = the radio continuum counterpart has two lobe-like components identified in higher-resolution data (TGSS-ADR1/SUMSS/NVSS) or shows elongated structure (suggesting multiple components) but a single catalogued entry. T = the radio continuum counterpart has two clear lobes and a core clearly detected in the same higher-resolution dataset) C = the radio continuum counterpart is more complex than the previous three categories Note (2): HostFlag as follows: i = a host galaxy was identified in the AllWISE catalogue m = identification of the host galaxy is hindered by the mid-infrared data u = it is unclear which AllWISE source is most likely to be the host galaxy -------------------------------------------------------------------------------- Byte-by-byte Description of file: pulsar.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Name Name of source belonging to the POGS pulsar catalogue, POGSII-PS-NNN (catalog_id) 15- 23 F9.5 deg RAdeg Right Ascension for centroid of polarised component (J2000) (ra) 25- 33 F9.5 deg DEdeg Declination for centroid of polarised component (J2000) (dec) 35- 43 F9.5 deg GLON Galactic Longitude for centroid of polarised component (l) 45- 53 F9.5 deg GLAT Galactic Latitude for centroid of polarised component (b) 55- 61 E7.5 deg epos Uncertainty on centroid (pos_err) 62- 68 F7.2 rad/m2 RM Rotation Measure of polarised component (rm) 70- 73 F4.2 rad/m2 e_RM Uncertainty in Rotation Measure of polarised component (rm_err) 75 A1 --- complexFlag [N] Binary Y/N indicating whether the source is Faraday-complex (complex_flag) 77- 86 A10 --- complexTest [Inspection] Method used to determine Faraday complexity (complex_test) 88-110 A23 --- rm-method [RM Synthesis - Pol. Int.] Method used to determine Rotation Measure (rm_method) 112-120 A9 --- ionosphere [RMextract] Method used to correct for ionospheric Faraday rotation (ionosphere) 122 I1 --- Ncomp [1] Number of polarised components detected (Ncomp) 124-128 F5.3 Jy stokesI ? Stokes I flux density at reference frequency (stokesI) 130-134 F5.3 Jy e_stokesI ? Uncertainty in Stokes I flux density at reference frequency (stokesI_err) 136-139 F4.1 --- SpIndex ? Stokes I spectral index (spectral_index) 141-144 F4.2 --- e_SpIndex ? Uncertainty in Stokes I spectral index (spectral_index_err) 146-150 E5.2 Hz refFreqI ? Reference frequency for Stokes I and spectral index properties (reffreq_I) 152-156 F5.3 Jy Polint Polarised intensity at reffreq_pol (polint) 158-162 F5.3 Jy e_Polint ? Uncertainty in polarised intensity at reffreq_pol (polint_err) 164-182 A19 --- Pol-bias Method for correcting for polarisation bias (pol_bias) 184-187 A4 --- Flux-Type [Peak] Type of flux density measurement reported (Peak/Integrated) (flux_type) 189-192 F4.2 --- fracpol ? Fractional polarisation at refFreqpol (fracpol) 194-197 F4.2 --- e_fracpol ? Uncertainty in fractional polarisation at refFreqpol (fracpol_err) 199-203 E5.2 Hz refFreqpol Reference frequency at which polarisation properties derived (reffreq_pol) 205-209 F5.3 deg beamMaj Beam major axis (beam_maj) 211-215 F5.3 deg beamMin Beam minor axis (beam_min) 217-222 F6.2 deg beamPA Beam position angle (beam_pa) 224-228 E5.2 Hz refFreqbeam Reference frequency at which beamMaj, beamMin, beamPA measured (reffreq_beam) 230-235 E6.3 Hz minFreq Lowest frequency used to extract polarisation properties (minfreq) 237-242 E6.3 Hz maxFreq Highest frequency used to extract polarisation properties (maxfreq) 244-250 F7.1 Hz ChanWidth Channel width used to extract polarisation properties (channelwidth) 252-255 I4 --- Nchan Number of channels used when extracting polarisation properties (Nchan) 257-259 A3 --- Tel [MWA] Telescope used (telescope) 261-279 A19 --- Cat [2020PASA...37...29R] Bibcode reference for polarisation catalogue (catalog) 281-299 A19 --- dataref [2015PASA...32...25W] Bibcode reference for original data (dataref) 301-311 A11 --- dataId Pulsar ID (JHHMM+DDMM) (data_id) 313-346 A34 --- Notes Pulsar notes (notes) 348 I1 --- NSpIndex Number of spectral index components fit by Murphy et al. (2017PASA...34....20M) (spectral_index_ncomp) 350-357 F8.6 s Pspin Pulsar spin period (spin_period) 359-365 F7.3 pc/cm3 DM Dispersion Measure (dm) 367-372 F6.2 rad/m2 RMref ? ATNF Pulsar Catalogue rotation measure (rm_ref) 374-377 F4.2 rad/m2 e_RMref ? ATNF Pulsar Catalogue rotation measure uncertainty (rm_ref_err) -------------------------------------------------------------------------------- Acknowledgements: Christopher Riseley, chris.riseley.astro(at)gmail.com References: George et al., 2012PASA...29..214G, Detection Thresholds and Bias Correction in Polarized Intensity Wayth et al., 2015PASA...32...25W, GLEAM: the GaLactic and Extragalactic All-sky MWA survey ================================================================================ (End) Patricia Vannier [CDS] 30-Mar-2021