1753+3447 Scan 716


Observing log information

  Object:           1753+3447
  On scan num:      716 718 720
  Off scan num:     717 719 721
  R.A.:             17.914394 hrs
  Dec.:             34.776256 deg
  On azimuth:       271.174170 deg
  On zenith dist.:  24.911255 deg
  Off azimuth:      271.147560 deg
  Off zenith dist.: 24.874975 deg
  MJD:              52504
  UTC:              0.145949
  Center freq.:     1397.960172 MHz
  Doppler:          -0.00004421
  Num. correlators: 2
  Spectrom. atten.: 37 37 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 900 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:      0.011 Jy
  Lower 20% velocity: 4664.9 km/s
  Upper 20% velocity: 5078.2 km/s
   Systemic velocity: 4871.5 km/s
   Line width (20%):   413.4 km/s
  Profile integral:    4.04 Jy * km/s
                 A:    3.53
                 B:    4.23
         Ratio B/A:   1.197
  Flux integral
     velocity range:  4638.6 - 5111.2 km/s