N1134 Scan 562

Contents

Observing log information

  Object:           N1134
  On scan num:      562 564 566
  Off scan num:     563 565 567
  R.A.:             2.894821 hrs
  Dec.:             13.014681 deg
  On azimuth:       229.136180 deg
  On zenith dist.:  34.175374 deg
  Off azimuth:      229.100830 deg
  Off zenith dist.: 34.160488 deg
  MJD:              52267
  UTC:              0.155139
  Center freq.:     1403.427692 MHz
  Doppler:          -0.00007506
  Num. correlators: 2
  Spectrom. atten.: 34 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 900 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:      0.144 Jy
  Lower 20% velocity: 3430.8 km/s
  Upper 20% velocity: 3872.9 km/s
   Systemic velocity: 3651.9 km/s
   Line width (20%):   442.1 km/s
  Profile integral:   43.93 Jy * km/s
                 A:   34.97
                 B:   44.40
         Ratio B/A:   1.270
  Flux integral
     velocity range:  3372.2 - 3925.5 km/s

Comments