0050+7248 Scan 709

Contents

Observing log information

  Object:           0050+7248
  On scan num:      709 711
  Off scan num:     710 712
  R.A.:             0.901132 hrs
  Dec.:             73.086982 deg
  On azimuth:       338.881430 deg
  On zenith dist.:  45.289365 deg
  Off azimuth:      338.888029 deg
  Off zenith dist.: 45.270231 deg
  MJD:              52503
  UTC:              0.524676
  Center freq.:     1398.525184 MHz
  Doppler:          0.00005123
  Num. correlators: 2
  Spectrom. atten.: 35 42 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 600 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

Measured spectrum

This is the section of spectrum measured to obtain the parameters listed below. The three horizontal dotted lines are the baseline, the peak level selected, and 20% of the peak level. The two vertical dotted lines mark the selected 20% line width edges. The solid horizontal line marks the velocity range chosen for the the line profile flux density integral. This spectrum has a second-order least squares fit baseline removed using most of the baseline shown in Figure 1.

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.023 Jy
  Lower 20% velocity: 4590.3 km/s
  Upper 20% velocity: 4966.3 km/s
   Systemic velocity: 4778.3 km/s
   Line width (20%):   375.9 km/s
  Profile integral:    6.44 Jy * km/s
                 A:    5.56
                 B:    6.52
         Ratio B/A:   1.174
  Flux integral
     velocity range:  4561.3 - 4995.2 km/s

Comments