U06821 Scan 2326


Observing log information

  Object:           U06821
  On scan num:      2326 2328 2330 2332 2334 2336 2338 2340 2342 2344
  Off scan num:     2327 2329 2331 2333 2335 2337 2339 2341 2343 2345
  R.A.:             11.850255 hrs
  Dec.:             20.396963 deg
  On azimuth:       118.656104 deg
  On zenith dist.:  30.078446 deg
  Off azimuth:      118.629476 deg
  Off zenith dist.: 30.092748 deg
  MJD:              52254
  UTC:              0.413183
  Center freq.:     1390.678406 MHz
  Doppler:          0.00009659
  Num. correlators: 2
  Spectrom. atten.: 33 39 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 3000 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. Narrow band interference was removed from 11 channels by interpolation between the nearest valid channels

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.021 Jy
  Lower 20% velocity: 6585.8 km/s
  Upper 20% velocity: 6307.8 km/s
   Systemic velocity: 6446.8 km/s
   Line width (20%):  -278.0 km/s
  Profile integral:    3.86 Jy * km/s
                 A:    3.05
                 B:    3.89
         Ratio B/A:   1.275
  Flux integral
     velocity range:  6282.6 - 6607.3 km/s


some RFI on profile wings