0155+0250 Scan 526


Observing log information

  Object:           0155+0250
  On scan num:      526 528 530
  Off scan num:     527 529 531
  R.A.:             1.968465 hrs
  Dec.:             3.085203 deg
  On azimuth:       162.249232 deg
  On zenith dist.:  36.510768 deg
  Off azimuth:      162.221288 deg
  Off zenith dist.: 36.514954 deg
  MJD:              52267
  UTC:              0.015787
  Center freq.:     1395.007048 MHz
  Doppler:          -0.00008942
  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:      0.046 Jy
  Lower 20% velocity: 5357.2 km/s
  Upper 20% velocity: 5689.0 km/s
   Systemic velocity: 5523.1 km/s
   Line width (20%):   331.8 km/s
  Profile integral:    9.72 Jy * km/s
                 A:    8.29
                 B:   10.24
         Ratio B/A:   1.236
  Flux integral
     velocity range:  5299.1 - 5739.5 km/s


very asymmetric profile