N2713 Scan 754


Observing log information

  Object:           N2713
  On scan num:      754 756 758 760 762 764 766 768 770 772
  Off scan num:     755 757 759 761 763 765 767 769 771 773
  R.A.:             8.955691 hrs
  Dec.:             2.921159 deg
  On azimuth:       101.757266 deg
  On zenith dist.:  70.937187 deg
  Off azimuth:      101.726150 deg
  Off zenith dist.: 70.973115 deg
  MJD:              52775
  UTC:              0.754306
  Center freq.:     1401.932864 MHz
  Doppler:          -0.00009316
  Num. correlators: 2
  Spectrom. atten.: 0 0 dB
  Bandwidth:        12.5 MHz
  Num. channels:    8192
  Eff. integration: 2970 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.

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.032 Jy
  Lower 20% velocity: 3601.6 km/s
  Upper 20% velocity: 4241.0 km/s
   Systemic velocity: 3921.3 km/s
   Line width (20%):   639.4 km/s
  Profile integral:   10.73 Jy * km/s
                 A:    9.87
                 B:   11.58
         Ratio B/A:   1.174
  Flux integral
     velocity range:  3548.6 - 4272.9 km/s