1230+040 Scan 144


Observing log information

  Object:           1230+040
  On scan num:      144 146 148 150
  Off scan num:     145 147 149 151
  R.A.:             12.558209 hrs
  Dec.:             3.794446 deg
  On azimuth:       141.885542 deg
  On zenith dist.:  40.828936 deg
  Off azimuth:      141.846301 deg
  Off zenith dist.: 40.843141 deg
  MJD:              52603
  UTC:              0.498495
  Center freq.:     1416.227163 MHz
  Doppler:          0.00008463
  Num. correlators: 2
  Spectrom. atten.: 38 38 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 1200 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:      0.015 Jy
  Lower 20% velocity:  850.9 km/s
  Upper 20% velocity:  958.7 km/s
   Systemic velocity:  904.8 km/s
   Line width (20%):   107.8 km/s
  Profile integral:    1.27 Jy * km/s
                 A:    1.14
                 B:    1.30
         Ratio B/A:   1.143
  Flux integral
     velocity range:   839.4 -  978.4 km/s