M31 Scan 818


Observing log information

  Object:           M31
  On scan num:      818
  Off scan num:     819
  R.A.:             0.712291 hrs
  Dec.:             41.269240 deg
  On azimuth:       295.911061 deg
  On zenith dist.:  50.371853 deg
  Off azimuth:      295.893793 deg
  Off zenith dist.: 50.336370 deg
  MJD:              52504
  UTC:              0.529479
  Center freq.:     1419.560247 MHz
  Doppler:          0.00007143
  Num. correlators: 2
  Spectrom. atten.: 37 37 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 300 seconds

Raw spectrum

This spectrum is the integration of all data for the scan with spectra from both polarizations added together. The spectral intensities are Ssys * (on - off) / off, where Ssys is the system temperature in Jy. The system noise flux density equivalent is calibrated for each scan with a calibration noise source firing during each scan. The cal value, in Jy, is calibrated by comparison with a number of continuum sources as described in the summary web page

Figure 1. Unedited spectrum