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J/A+A/458/245
  Obs. of 2 Unidentified Gamma-ray Sources (La Palombara+, 2006)
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img(gal)
1.J/A+A/458/245/table7Main characteristics of the X-ray sources with no candidate optical counterpart and log(FX/Fopt)≳2 (chart) (9 rows)

 
Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  Obs  EPIC field sequential reference number (meta.id;obs.field)
  XMMU (char) XMMU designation (JHHMMSS.s+DDMMSS) (meta.id;meta.main)
  Bands (char) Detection bands (instr.bandpass)
  l_kTbt (char) [<≥ ] Limit flag on kTbt (meta.code.error)
  kTbt keV Range of possible kT temperature for thermal bremsstrahlung spectrum (phys.temperature)
  kTbt2 keV (n) Range of possible kT temperature for thermal bremsstrahlung spectrum (phys.temperature)
  l_kTbb (char) [<≥ ] Limit flag on kTbb (meta.code.error)
  kTbb keV Range of possible kT temperature for thermal blackbody spectrum (phys.temperature)
  kTbb2 keV (n) Range of possible kT temperature for thermal blackbody spectrum (phys.temperature)
  l_Gamma (char) [<≥ ] Limit flag on Gamma (meta.code.error)
  Gamma keV Range of photon index for a power law spectrum (meta.code;spect.index)
  Gamma2 keV (n) Range of photon index for a power law spectrum (spect.index)
  Flux 10-17W/m2Source flux in 0.3-10keV energy range (phot.flux;em.X-ray)
  e_Flux 10-17W/m2rms uncertainty on Flux (stat.error;phot.flux)
  log(FX/Fopt) [-] Lower limit of X-ray-to-optical flux ratio (phot.flux;arith.ratio)
  e_log(FX/Fopt) [-] rms uncertainty on log(FX/Fopt) (stat.error)

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