01024+3735 Scan 1038


Observing log information

  Object:           01024+3735
  On scan num:      1038 1040 1042 1044 1046 1048
  Off scan num:     1039 1041 1043 1045 1047 1049
  R.A.:             1.091146 hrs
  Dec.:             37.852988 deg
  On azimuth:       293.394664 deg
  On zenith dist.:  54.507646 deg
  Off azimuth:      293.377570 deg
  Off zenith dist.: 54.477182 deg
  MJD:              52245
  UTC:              0.266134
  Center freq.:     1403.007849 MHz
  Doppler:          -0.00005788
  Num. correlators: 2
  Spectrom. atten.: 35 41 dB
  Bandwidth:        40.0 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. Narrow band interference was removed from 4 channels by interpolation between the nearest valid channels

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.004 Jy
  Lower 20% velocity: 6051.8 km/s
  Upper 20% velocity: 6457.5 km/s
   Systemic velocity: 6254.7 km/s
   Line width (20%):   405.7 km/s
  Profile integral:    1.32 Jy * km/s
                 A:    1.11
                 B:    0.89
         Ratio B/A:   0.801
  Flux integral
     velocity range:  5981.9 - 6506.1 km/s


finder spectrum, RFI on low velocity wing