N03884 Scan 37


Observing log information

  Object:           N03884
  On scan num:      37 39 41 43 45
  Off scan num:     38 40 42 44 46
  R.A.:             11.770085 hrs
  Dec.:             20.392135 deg
  On azimuth:       104.594310 deg
  On zenith dist.:  39.971174 deg
  Off azimuth:      104.562031 deg
  Off zenith dist.: 39.999628 deg
  MJD:              52249
  UTC:              0.385845
  Center freq.:     1388.375477 MHz
  Doppler:          0.00009675
  Num. correlators: 2
  Spectrom. atten.: 40 63 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 720 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 25 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:      0.010 Jy
  Lower 20% velocity: 6701.5 km/s
  Upper 20% velocity: 7222.2 km/s
   Systemic velocity: 6961.9 km/s
   Line width (20%):   520.7 km/s
  Profile integral:    3.15 Jy * km/s
                 A:    2.31
                 B:    0.00
         Ratio B/A:   0.000
  Flux integral
     velocity range:  6659.7 - 7259.5 km/s


very low SNR so edges are guesstimates