N4414 Scan 86

Contents

Observing log information

  Object:           N4414
  On scan num:      86 98 100 102 104 106
  Off scan num:     87 99 101 103 105 107
  R.A.:             12.440866 hrs
  Dec.:             31.223396 deg
  On azimuth:       277.013979 deg
  On zenith dist.:  43.200807 deg
  Off azimuth:      276.989944 deg
  Off zenith dist.: 43.164848 deg
  MJD:              52419
  UTC:              0.211065
  Center freq.:     1416.888834 MHz
  Doppler:          -0.00008033
  Num. correlators: 2
  Spectrom. atten.: 38 40 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 1800 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.

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.203 Jy
  Lower 20% velocity:  508.4 km/s
  Upper 20% velocity:  917.3 km/s
   Systemic velocity:  712.8 km/s
   Line width (20%):   408.9 km/s
  Profile integral:   58.13 Jy * km/s
                 A:   53.94
                 B:   58.00
         Ratio B/A:   1.075
  Flux integral
     velocity range:   476.9 -  947.0 km/s

Comments