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J/ApJ/999/244
  X-ray catalog and classification of 4FGL-DR4 UGSs (Neumann+ 2026)
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2026ApJ...999..244N
Similar Catalogs
Post annotation 		img(gal)
1.J/ApJ/999/244/table2Swift X-Ray sources with extreme photon indices, alphaX<0 or alphaX>4, included in the main analysis (17 rows)
2.J/ApJ/999/244/table3Parameters for singlet X-ray sources detected with Swift-XRT within 4FGL-DR4 unassociated source uncertainty ellipses (218 rows)
3.J/ApJ/999/244/table4Parameters for X-Ray sources detected with Swift-XRT within 4FGL-DR4 unassociated source uncertainty ellipses (70 rows)
4.J/ApJ/999/244/table5Neural network classification of X-Ray singlets utilizing the blazar probability parameter (218 rows)
5.J/ApJ/999/244/table6Neural network classification of X-Ray multiplets utilizing the blazar probability parameter (70 rows)
6.J/ApJ/999/244/table7Potential radio counterparts to X-ray singlets (218 rows)
7.J/ApJ/999/244/table8Potential radio counterparts to X-ray multiplets (70 rows)
8.J/ApJ/999/244/table9a(c)Targets with a single significant X-ray sources (218 rows)
9.J/ApJ/999/244/table9b(c)Targets with multiple significant X-ray sources (70 rows)

Simple ConstraintList Of Constraints
 
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Column  Constraint Explain   (UCD)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
   (ALL)4FGL (char) 4FGL designation, JHHMM.m+DDMMa (meta.id;meta.main)
  (1)n_4FGL (char) [*] * indicates 4FGL sources with multiple X-ray sources (meta.note)
   (ALL)SwXF4-DR4 (char) SwXF4-DR4 designation, JHHMMSS.s+DDMMSS (meta.id)
  (1)nH 10+22cm-2Hydrogen column density obtained with the nH function (phys.columnDensity)
  (1+2+3+8+9)alphaX  Photon index (Note 1)   (stat.fit.param)
  (1+8+9)e_alphaX  (n) Photon index error (Note 1)   (stat.error)
  (1)Ctp (char) Possible Counterpart (Note 2)   (meta.id.assoc)
  (2+3+8+9)logFG [mW/m2] (n) log {gamma}-ray 0.1-100GeV flux (erg/s/cm2) (phot.flux.density;em.gamma.hard)
  (2+3+8+9)PLIndex  (n) gamma-ray photon index when fitting with PowerLaw (stat.fit.param)
  (2+3)logVIndex [-] (n) Year-to-year {gamma}-ray variability (src.var.index)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (2+3)logPLECSigC [-] (n) Curvature significance of PLEC model (stat.fit.param)
  (2+3+8+9)SwUVF4-DR4 (char) UVOT designation, JHHMMSS.s+DDMMSS, SwUVF4-DR4 (meta.id)
  (2+3)S/N  XRT signal-to-noise ratio (stat.snr)
  (2+3+8+9)logFX [mW/m2] Unabsorbed log X-ray 0.3-10keV flux (erg/s/cm2) (Note 2)   (phot.flux;em.X-ray)
  (2+3)Filter (char) UVOT filter used to calculate Vmag (instr.setup;instr.filter)
  (2+3+6+7+8+9)l_Vmag (char) Limit flag on V-band (meta.code.error)
  (2+3+6+7+8+9)Vmag mag (n) V-band magnitude calculated with UVOT filter (Note 3)   (phot.mag;em.opt.V)
  (2+3+8+9)SwXF4-DR4K (char) SwXF4-DR4 identifier, JHHMMSS.s+DDMMSS, Kerby et al. (2021ApJ...923...75K, Cat. J/ApJ/923/75K) (Note 4)   (meta.id)
  (4+5)Type (char) Type, only in table5.dat (Note 1)   (meta.note;src.morph.type)
  (4+5)SGU (char) [*] * for gamma-ray sources flagged as soft Galactic unassociated (SGU) in 4FGL-DR4 (meta.code)
  (4+5+8+9)Pbzr  (n) Blazar probability parameter (stat.fit.goodness)
  (4+5+8+9)Plim  (n) For X-ray sources with a V-magnitude lower limit, classification results if mV=30 (stat.fit.goodness)
  (4+5+8+9)PK21  (n) Blazar probability for X-ray sources shared with Kerby et al. (2021ApJ...923...75K, Cat. J/ApJ/923/75) (stat.fit.goodness)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (4+5+8+9)SIM-src (char) Potential SIMBAD counterpart (meta.id.assoc)
  (4+5)n_SIM-src (char) [*] Note on SIM-src (Note 2)   (meta.note)
  (4+5+8+9)SIM-dist arcsec (n) Offset for potential SIMBAD counterpart (pos.distance)
  (4+5)Class (char) Literature classification (src.class)
  (6+7)RName (char) Radio Source name (meta.id.assoc)
  (6+7)Offset arcsec (n) Offset betweeb gamma and radio sources (pos.distance)
  (6+7)Frad mJy (n) Radio flux density (phot.flux.density;em.radio)
  (6+7)l_R (char) Limit flag on R (meta.code.error)
  (6+7)R  (n) Radio-loudness parameter (Note 1)   (phot.flux;arith.ratio)
  (8+9)RAJ2000 deg (i) Right ascension in decimal degrees (J2000) (pos.eq.ra;meta.main)
  (8+9)DEJ2000 deg (i) Declination in decimal degrees (J2000) (pos.eq.dec;meta.main)
  (8+9)e_logFG [mW/m2] Uncertainty in logFG (erg/s/cm2) (Note 1)   (stat.error)
  (8+9)VIndex  Year-to-year {gamma}-ray variability (Note 1)   (src.var.index)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (8+9)PLECSigC  Curvature significance of PLEC model (Note 1)   (stat.fit.param)
  (8+9)SGU  Soft Galactic Unassociated source flag (Note 1)   (meta.code)
  (8+9)erad arcsec Positional XRT uncertainty (stat.error;pos)
  (8)Counts ct (n) Background subtracted X-ray counts of XRT source (phot.count;em.X-ray)
  (8+9)SNSOSTA  SOSTA XRT Signal-to-Noise (stat.snr)
  (8+9)e_logFX [mW/m2] Uncertainty in logFX (erg/s/cm2) (stat.error)
  (8+9)UVOT (char) Swift-UVOT filter used for Vmag (meta.code;instr.filter)
  (8+9)f_UVOT (char) Flag on UVOT (Note 2)   (meta.code)
  (8+9)e_Vmag mag (n) Uncertainty in Vmag (Note 3)   (stat.error;phot.mag)
  (8+9)vvmag mag (n) Apparent vv band (547nm) AB magnitude measurement (Note 3)   (phot.mag;em.opt.V)
  (8+9)l_vvmag (char) [l] l for detection limiting vv magnitude (meta.code.error)
  (8+9)e_vvmag mag (n) Uncertainty in vvmag (Note 3)   (stat.error;phot.mag)
  (8+9)bbmag mag (n) Apparent bb band (439nm) AB magnitude measurement (Note 3)   (phot.mag;em.opt.B)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (8+9)l_bbmag (char) [l] l for detection limiting bb magnitude (meta.code.error)
  (8+9)e_bbmag mag (n) Uncertainty in bbmag (Note 3)   (stat.error;phot.mag)
  (8+9)uumag mag (n) Apparent uu band (347nm) AB magnitude measurement (Note 3)   (phot.mag;em.opt.U)
  (8+9)l_uumag (char) [l] l for detection limiting uu magnitude (meta.code.error)
  (8+9)e_uumag mag (n) Uncertainty in uumag (Note 3)   (stat.error;phot.mag)
  (8+9)w1mag mag (n) Apparent w1 band (260nm) AB magnitude measurement (Note 3)   (phot.mag;em.UV)
  (8+9)l_w1mag (char) [l] l for detection limiting w1 magnitude (meta.code.error)
  (8+9)e_w1mag mag (n) Uncertainty in w1mag (Note 3)   (stat.error;phot.mag)
  (8+9)m2mag mag (n) Apparent m2 (225nm) band AB magnitude measurement (Note 3)   (phot.mag;em.UV)
  (8+9)l_m2mag (char) [l] l for detection limiting m2 magnitude (meta.code.error)
  (8+9)e_m2mag mag (n) Uncertainty in m2mag (Note 3)   (stat.error;phot.mag)
  (8+9)w2mag mag (n) Apparent w2 band (193nm) AB magnitude measurement (Note 3)   (phot.mag;em.UV)
  (8+9)l_w2mag (char) [l] l for detection limiting w2 magnitude (meta.code.error)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
  (8+9)e_w2mag mag (n) Uncertainty in w2mag (Note 3)   (stat.error;phot.mag)
  (8+9)f_SIM-src (char) Flag on SIM-src (Note 6)   (meta.code)
  (8+9)SIM-type (char) SIMBAD counterpart classification (src.class)
  (8+9)Rad-src (char) Likely radio counterpart (Note 7)   (meta.id.assoc)
  (8+9)Rad-dist arcsec (n) Offset from radio counterpart (pos.distance)
  (8+9)FRad mJy (n) Radio counterpart radio flux density (Note 8)   (phot.flux.density;em.radio)
  (8+9)Rloud  Radio loudness parameter (phot.flux;arith.ratio)
  (8+9)l_Rloud   [0/1] Radio loudness parameter lower limit flag (Note 9)   (meta.code.error)
  (9)counts ct Background subtracted X-ray counts of XRT source (phot.count;em.X-ray)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
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