J/ApJS/270/33/catalogThe complete MeerKAT Absorption Line Survey (MALS) DR1 (v2) radio source catalogID[735647/1471292] Identifier (source_id)meta.idintindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDPtg[1/782] Pointing sequence number (id_x)meta.idintPointingMALS pointing ID (JHHMMSS.ss+DDMMSS.s) based on the position (J2000) of the central source in NVSS or SUMSS (pointing_name)meta.idcharDate1The date and time (UTC) of the start of L-band observing block (s) (ISO) (obs_date_l)time.start;meta.tablenullableindexedDate2Second date and time (UTC) of the start of L-band observing block (s) (ISO) if any (obs_date_l_2) 62 A1 --- Band Observing band (always "L") (obs_band)time.start;meta.tablenullableFluxCal1Calibrator used for flux density and bandpass calibration of the data set (fluxcal)phot.flux.density;em.radio.750-1500MHzcharFluxCal2Second calibrator used for flux density and bandpass calibration of the data set if any (fluxcal)phot.flux.density;em.radio.750-1500MHzcharFluxScFlux density scales used for the flux density calibrators (fluxscale) (1)phot.flux.density;em.radio.750-1500MHzcharSPW/WBWhether the continuum image is made using an SPW or the entire wideband (WB) (spw_id) (2)spect.line.widthcharFreq[1005.8/1381.2] Reference frequency of the continuum image (ref_freq)MHzem.freqfloatMajaxis[7.6/22.2] Major axis of the restoring beam (maj_restoring_beam)arcsecphys.angSize;instr.beamfloatMinaxis[6/11.7] Minor axis of the restoring beam (min_restoring_beam)arcsecphys.angSize;instr.beamfloatPA[-86.5/89] Position angle of the restoring beam (pa_restoring_beam)degpos.posAng;instr.beamfloatsigma1[15/1312] RMS noise measured from primary beam-uncorrected rms image in an annular ring at primary beam FWHM (sigma_1)uJy/beaminstr.det.noisefloatsigma2[13/645] RMS noise measured from primary beam-uncorrected rms image in an annular ring at 2 times the primary beam FWHM (sigma_2)uJy/beaminstr.det.noisefloatNameMALS name of the source (JHHMMSS.ss+DDMMSS.s) (source_name)meta.id;meta.maincharindexedScode[MS] The PyBDSF code defining the source structure (s_code) (3)meta.codecharRAJ2000Right ascension (J2000) of the mean intensity-weighted position of all pixels above the island threshold measured if source is fitted with multiple Gaussians (ra_mean)degpos.eq.ra;meta.mainindexede_RAJ2000[5.5e-05/0.007] 1{sigma} error on RAdeg using Equation 1 (ra_mean_e)degstat.error;pos.eq.radoubleDEJ2000[-79/32.2] Declination (J2000) of the mean intensity-weighted position of all pixels above the island threshold measured if source is fitted with multiple Gaussians (dec_mean)degpos.eq.dec;meta.mainindexede_DEJ2000[8.3e-5/0.01] 1{sigma} error on DEdeg using Equation 1 (dec_mean_e)degstat.error;pos.eq.decdoubleRAMdegThe R.A. (J2000) of the pixel corresponding to maximum flux density (ra_max)degpos.eq.rae_RAMdeg[5.5e-5/0.007] 1{sigma} error on RAMdeg using Equation 1 (ra_max_e)degstat.errordoubleDEMdeg[-79/32.2] The decl. (J2000) of the pixel corresponding to maximum flux density (dec_max)degpos.eq.dece_DEMdeg[8.3e-5/0.01] 1{sigma} error on DEMdeg using Equation 1 (dec_max_e)degstat.errordoubleFlux[0.015/17901] Total integrated flux density of the source based on Gaussian component fits, i.e., corrected for primary beam and wideband effects (total_flux)mJyphot.flux.density;em.radio.750-1500MHzdoublee_Flux[0.009/968] 1{sigma} error on Flux estimated using Equation 2 (total_flux_e)mJystat.error;phot.fluxdoubleErrFlux[0.007/549] The fitting error on total flux density to be taken into account to obtain e_Flux (see Section 4.2 and Equation 2) (total_flux_e_fit)stat.errordoublesErrFlux[0.006/797] The systematic error to be taken into account to obtain e_Flux (see Section 4.2 and Equation 2) (total_flux_e_sys)stat.errordoubleFluxAlt[0.01/17473] Total integrated flux density of the source based on alternate primary beam model, i.e., plumber (Section 4.3) obtained by multiplying Flux and FluxCorr (total_flux_measured)mJyphot.flux.density;em.radio.750-1500MHzdoublee_FluxAlt[0.009/957] 1{sigma} error on FluxAlt (total_flux_measured_e)mJystat.errordoubleFluxPk[0.03/11876] Peak flux density of the source (peak_flux)mJy/beamphot.flux.density;em.radio.750-1500MHzdoublee_FluxPk[0.006/46] 1{sigma} error on FluxPk (peak_flux_e)mJy/beamstat.errorfloatFluxIsl[-0.03/17981] Total integrated flux density of the island in which the source is located (isl_total_flux)mJyphot.flux.density;em.radio.750-1500MHzdoublee_FluxIsl[0.009/236] 1{sigma} error on FluxIsl (isl_total_flux_e)mJystat.errorfloatrmsIsl[0.009/46] Average background rms noise of the island in which the source is located (isl_rms)mJy/beamstat.stdev;instr.det.noise;stat.meanfloatIsl[-22/23] Average background mean value of the island in which the source is located (isl_mean)mJy/beaminstr.background;stat.meanfloatResrmsIsl[0/51] Average residual background rms noise of the island in which the source is located (resid_isl_rms)mJy/beamstat.fit.residual;instr.det.noise;stat.meanfloatResIsl[-25/35] Average residual background mean value of the island in which the source is located (resid_isl_mean)mJy/beaminstr.background;stat.meanfloatFluxCorr[0.9/1.1] The factor to be multiplied to flux density measurements and errors to obtain the values corresponding to the plumber beam model (see Section 4.3 and Appendix C) (flux_correction)arith.factorfloatRealWhether a source is a real astrophysical source or an artifact (Always "True") (real_source)meta.codecharResWhether a source is resolved based on the reliability envelope method (see Figure 10) (resolved)meta.codecharSpWindSpectral windows used for determining spectral index and curvature using the narrowband multifrequency synthesis (MFS) images (spectral_index_spwused) (5)meta.notecharSpwfit[-50/45]? Spectral index and curvature of the source based on Flux from narrowband (i.e., SPW-based) images (spectral_index_spwfit)spect.indexdoublenullablee_Spwfit[0.006/7]? 1{sigma} error on Spwfit (spectral_index_spwfit_e)stat.errordoublenullableSpMALS[-2.6/2]? Spectral index and curvature based on Flux from narrowband images from MALS and measurements from the literature (spectral_index_mals_lit)spect.indexdoublenullablee_SpMALS[0.04/0.5]? 1{sigma} error on SpMALS (spectral_index_mals_lit_e)stat.errordoublenullableSpIndLitList of external surveys ("TGSS-ADR1", "L:9" or "L:2") used (spectral_index_lit)meta.bibcharsigma20[26/2530] RMS noise at a cumulative fraction of 0.2 of the rms noise distribution of the primary beam-corrected rms image (see Wagenveld+ 2023 for details) (sigma_20)uJy/beaminstr.det.noisefloatSepPtg[0.0003/86] Distance of the source from the pointing center (distance_pointing)arcminpos.angDistancefloatSepNN[0.1/25] Distance of the source from the nearest neighbor in the field (distance_nn)arcminpos.angDistancefloatNgauss[1/96] Number of Gaussian components fitted to the source (n_gauss)meta.numberintGaussMax[0.08/450]? Maximum separation between the Gaussian components (NULL for "S"-type sources) (maxsep_gauss)arcsecpos.angDistancefloatnullableMajFWHM[5/366] FWHM of the major axis of the source (maj)arcsecphys.angSizedoublee_MajFWHM[0.001/81] 1{sigma} error on MajFWHM (maj_e)arcsecstat.errordoubleMinFWHM[2/144] FWHM of the minor axis of the source (min)arcsecphys.angSizedoublee_MinFWHM[0.0005/29.3] 1{sigma} error on MinFWHM (min_e)arcsecstat.errordoubleMajPA[3.6e-5/180] Position angle of the major axis of the source measured east of north (PA)degpos.posAngdoublee_MajPA[2.2e-5/180] 1{sigma} error on MajPA (pa_e)degstat.errordoubleMaj0FWHM[0/366] FWHM of the deconvolved major axis of the source (dc_maj)arcsecphys.angSizedoublee_Maj0FWHM[0.001/81] 1{sigma} error on Maj0FWHM (dc_maj_e)arcsecstat.errordoubleMin0FWHM[0/143] FWHM of the deconvolved minor axis of the source (dc_min)arcsecphys.angSizedoublee_Min0FWHM[0.0005/29.3] 1{sigma} error on Min0FWHM (dc_min_e)arcsecstat.errordoubleMaj0PA[0/180] Position angle of the deconvolved major axis of the source measured east of north (dc_pa)degpos.posAngdoublee_Maj0PA[2.2e-5/180] 1{sigma} error on Maj0PA (dc_pa_e)degstat.errordouble
J/ApJS/270/33/tablea1*All L-band (900-1670MHz) MeerKAT Absorption Line Survey pointingsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDPointing ID (JHHMMSS.ss+DDMMSS.s) (G1)meta.id;meta.maincharflagPointing flag (2)meta.code.errorcharDateTimeUTC Date and Start time, ISO8601 formattime.startcharsigma1-SPW9[15.3/380]? RMS at primary beam, for SPW9uJy/beamstat.errorfloatnullablesigma2-SPW9[14/265]? RMS at twice of the primary beam, for SPW9uJy/beamstat.errorfloatnullableSSPW9[32.7/11902]? Flux density of the central radio source, for SPW9 (1350.9-1411.0MHz)mJyphot.flux.density;em.radio.750-1500MHzfloatnullableClassClass (3)meta.code.classcharsigma1-v[16/1311.4]? RMS at primary beam, for SPW2uJy/beamstat.errorfloatnullablesigma2-v[13.8/645]? RMS at twice of the primary beam, for SPW2uJy/beamstat.errorfloatnullableSSPW2[87.6/11287]? Flux density of the central radio source, for SPW2 (976.4-1036.5MHz)mJyphot.flux.density;em.radio.750-1500MHzfloatnullableNsrcSPW9[186/1292]? Total number of sources detected in the primary beam-corrected field, SPW9meta.numberintnullableNsrcSPW2[34/3428]? Total number of sources detected in the primary beam-corrected field, SPW2meta.numberintnullable
J/ApJS/270/33/tablee1List of ultra-steep sources flagged as candidate high-redshift radio galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSPW2[0.9/32] Total integrated flux density in SPW2mJyphot.flux.density;em.radio.750-1500MHzfloatalpha[-2/-1.3] Spectral index (3)spect.indexfloate_alpha[0.05/0.2] Uncertainty in alphastat.error;pos.eq.rafloatPS1Boolean flag for PS1 match ("True": 42 occurrences)meta.codecharWISEBoolean flag for WISE match ("True": 55 occurrences)meta.codecharFlag[1/4] PS1+WISE match flag (4)meta.code.errorintzNED[0.098/0.91]? NED redshift measurementsrc.redshift;pos.heliocentricfloatnullableSCodeS_Code from PyBDSF catalog, Table 3 (2)meta.codecharIDPointing ID (JHHMMSS.ss+DDMMSS.s) (G1)meta.id;meta.maincharr_zNEDReference for NED redshift (5)meta.ref;pos.framechar
J/ApJS/270/33/tablef1List of variable radio sourcesfvar[0.3/4] Fractional variabilitysrc.var.indexfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDPointing IDs (JHHMMSS.ss+DDMMSS.s) (G1)meta.id;meta.maincharVs[-17.2/43.4] Variability strength (Equation 9: V_s_={Delta}S/({sigma}_1_^2^+{sigma}_1_^2^)^0.5^; Section 5.3)src.var.indexfloatm[0.1/2.6] Modulation index (see Equation 8 in Section 5.3)src.var.indexfloat