0706+2041 Scan 683


Observing log information

  Object:           0706+2041
  On scan num:      683 685 687
  Off scan num:     684 686 688
  R.A.:             7.153125 hrs
  Dec.:             20.603995 deg
  On azimuth:       200.971632 deg
  On zenith dist.:  18.803836 deg
  Off azimuth:      201.005177 deg
  Off zenith dist.: 18.807537 deg
  MJD:              52262
  UTC:              0.293634
  Center freq.:     1395.710459 MHz
  Doppler:          0.00003183
  Num. correlators: 2
  Spectrom. atten.: 34 40 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:      0.076 Jy
  Lower 20% velocity: 5084.8 km/s
  Upper 20% velocity: 5450.3 km/s
   Systemic velocity: 5267.6 km/s
   Line width (20%):   365.4 km/s
  Profile integral:   17.24 Jy * km/s
                 A:   13.92
                 B:   17.29
         Ratio B/A:   1.242
  Flux integral
     velocity range:  4972.8 - 5574.7 km/s


very asymmetric profile, poorly defined edges