N5990 Scan 736


Observing log information

  Object:           N5990
  On scan num:      736 738 740 742 744 746
  Off scan num:     737 739 741 743 745 747
  R.A.:             15.771142 hrs
  Dec.:             2.414839 deg
  On azimuth:       234.378445 deg
  On zenith dist.:  50.511855 deg
  Off azimuth:      234.340992 deg
  Off zenith dist.: 50.487611 deg
  MJD:              52634
  UTC:              0.721505
  Center freq.:     1402.670847 MHz
  Doppler:          0.00006098
  Num. correlators: 2
  Spectrom. atten.: 38 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 1680 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 4 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.

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.031 Jy
  Lower 20% velocity: 3615.8 km/s
  Upper 20% velocity: 3993.9 km/s
   Systemic velocity: 3804.8 km/s
   Line width (20%):   378.1 km/s
  Profile integral:    4.74 Jy * km/s
                 A:    5.14
                 B:    5.79
         Ratio B/A:   1.126
  Flux integral
     velocity range:  3587.0 - 4052.0 km/s


two blended profiles?