LVM390. Scan 141


Observing log information

  Object:           LVM390.
  On scan num:      141 143 145 147 149 151
  Off scan num:     142 144 146 148 150 152
  R.A.:             10.083241 hrs
  Dec.:             79.271691 deg
  On azimuth:       347.927824 deg
  On zenith dist.:  45.621228 deg
  Off azimuth:      347.936828 deg
  Off zenith dist.: 45.609109 deg
  MJD:              52285
  UTC:              0.480532
  Center freq.:     1379.093747 MHz
  Doppler:          -0.00000184
  Num. correlators: 2
  Spectrom. atten.: 33 38 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 1500 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 10 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 10 channels by interpolation between the nearest valid channels

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.008 Jy
  Lower 20% velocity: 8855.9 km/s
  Upper 20% velocity: 9342.1 km/s
   Systemic velocity: 9099.0 km/s
   Line width (20%):   486.2 km/s
  Profile integral:    3.09 Jy * km/s
                 A:    2.44
                 B:    3.08
         Ratio B/A:   1.263
  Flux integral
     velocity range:  8842.3 - 9358.7 km/s