0243+1253 Scan 515


Observing log information

  Object:           0243+1253
  On scan num:      515 517 519
  Off scan num:     516 518 520
  R.A.:             2.771458 hrs
  Dec.:             13.095465 deg
  On azimuth:       247.166962 deg
  On zenith dist.:  44.731829 deg
  Off azimuth:      247.134849 deg
  Off zenith dist.: 44.707168 deg
  MJD:              52261
  UTC:              0.210532
  Center freq.:     1390.242279 MHz
  Doppler:          -0.00007013
  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:      0.032 Jy
  Lower 20% velocity: 6229.9 km/s
  Upper 20% velocity: 6649.5 km/s
   Systemic velocity: 6439.7 km/s
   Line width (20%):   419.6 km/s
  Profile integral:   11.62 Jy * km/s
                 A:    9.11
                 B:   12.52
         Ratio B/A:   1.374
  Flux integral
     velocity range:  6191.1 - 6718.2 km/s


looks like two blended profiles, peak flux chosen for lower wiser profile which has rather braod and shallow wings