N3370 Scan 85

Contents

Observing log information

  Object:           N3370
  On scan num:      85 87 89 91 93 95 97 99 101 103 105 107
  Off scan num:     86 88 90 92 94 96 98 100 102 104 106 108
  R.A.:             10.784398 hrs
  Dec.:             17.274153 deg
  On azimuth:       190.100097 deg
  On zenith dist.:  21.372719 deg
  Off azimuth:      190.110381 deg
  Off zenith dist.: 21.373311 deg
  MJD:              52296
  UTC:              0.342674
  Center freq.:     1414.437924 MHz
  Doppler:          0.00005678
  Num. correlators: 2
  Spectrom. atten.: 34 40 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 3600 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:      0.161 Jy
  Lower 20% velocity: 1133.5 km/s
  Upper 20% velocity: 1426.2 km/s
   Systemic velocity: 1279.8 km/s
   Line width (20%):   292.7 km/s
  Profile integral:   32.89 Jy * km/s
                 A:   26.00
                 B:   32.76
         Ratio B/A:   1.260
  Flux integral
     velocity range:  1099.1 - 1449.3 km/s

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