U-10625 Scan 924

Contents

Observing log information

  Object:           U-10625
  On scan num:      924 926 928 930 932 934
  Off scan num:     925 927 929 931 933 935
  R.A.:             16.956758 hrs
  Dec.:             38.674039 deg
  On azimuth:       297.653156 deg
  On zenith dist.:  60.030839 deg
  Off azimuth:      297.632574 deg
  Off zenith dist.: 59.995691 deg
  MJD:              52532
  UTC:              0.164792
  Center freq.:     1410.702368 MHz
  Doppler:          -0.00004673
  Num. correlators: 2
  Spectrom. atten.: 35 39 dB
  Bandwidth:        10.0 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:      0.047 Jy
  Lower 20% velocity: 1959.8 km/s
  Upper 20% velocity: 2124.8 km/s
   Systemic velocity: 2042.3 km/s
   Line width (20%):   165.0 km/s
  Profile integral:    6.14 Jy * km/s
                 A:    5.56
                 B:    6.27
         Ratio B/A:   1.127
  Flux integral
     velocity range:  1937.4 - 2152.6 km/s

Comments