U11527 Scan 2205


Observing log information

  Object:           U11527
  On scan num:      2205 2207 2209 2211 2213 2215
  Off scan num:     2206 2208 2210 2212 2214 2216
  R.A.:             20.231896 hrs
  Dec.:             -1.156930 deg
  On azimuth:       230.000554 deg
  On zenith dist.:  52.337804 deg
  Off azimuth:      229.966566 deg
  Off zenith dist.: 52.317325 deg
  MJD:              52253
  UTC:              0.945567
  Center freq.:     1394.796669 MHz
  Doppler:          -0.00006989
  Num. correlators: 2
  Spectrom. atten.: 34 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 1740 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

Edited spectrum

This spectrum is the same as Figure 1 but with 2 60-second sub-integrations manually deleted because of interference or a bad baseline.

Figure 2. Edited 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 2. Narrow band interference was removed from 2 channels by interpolation between the nearest valid channels

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.025 Jy
  Lower 20% velocity: 5237.9 km/s
  Upper 20% velocity: 5731.3 km/s
   Systemic velocity: 5484.6 km/s
   Line width (20%):   493.4 km/s
  Profile integral:    7.96 Jy * km/s
                 A:    6.06
                 B:    8.03
         Ratio B/A:   1.326
  Flux integral
     velocity range:  5216.4 - 5755.1 km/s