UGC10857 Scan 268


Observing log information

  Object:           UGC10857
  On scan num:      268 270 272
  Off scan num:     269 271 273
  R.A.:             17.433426 hrs
  Dec.:             53.539559 deg
  On azimuth:       316.002646 deg
  On zenith dist.:  58.664380 deg
  Off azimuth:      315.987888 deg
  Off zenith dist.: 58.634514 deg
  MJD:              52621
  UTC:              0.961042
  Center freq.:     1379.237168 MHz
  Doppler:          0.00000500
  Num. correlators: 2
  Spectrom. atten.: 27 36 dB
  Bandwidth:         5.0 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:      0.008 Jy
  Lower 20% velocity: 8784.7 km/s
  Upper 20% velocity: 8929.9 km/s
   Systemic velocity: 8857.3 km/s
   Line width (20%):   145.2 km/s
  Profile integral:    0.70 Jy * km/s
                 A:    0.78
                 B:    0.84
         Ratio B/A:   1.073
  Flux integral
     velocity range:  8776.3 - 8936.8 km/s