U-08066 Scan 273


Observing log information

  Object:           U-08066
  On scan num:      273 275 277 279 281 283
  Off scan num:     274 276 278 280 282 284
  R.A.:             12.951298 hrs
  Dec.:             1.023228 deg
  On azimuth:       179.931050 deg
  On zenith dist.:  37.319428 deg
  Off azimuth:      179.895914 deg
  Off zenith dist.: 37.319148 deg
  MJD:              52484
  UTC:              0.905880
  Center freq.:     1407.295587 MHz
  Doppler:          -0.00008870
  Num. correlators: 2
  Spectrom. atten.: 38 38 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 1620 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

Edited spectrum

This spectrum is the same as Figure 1 but with 5 60-second sub-integrations manually deleted because of interference or a bad baseline.

Figure 2. Edited 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 2.

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.031 Jy
  Lower 20% velocity: 2686.6 km/s
  Upper 20% velocity: 2849.8 km/s
   Systemic velocity: 2768.2 km/s
   Line width (20%):   163.2 km/s
  Profile integral:    4.06 Jy * km/s
                 A:    3.62
                 B:    4.35
         Ratio B/A:   1.200
  Flux integral
     velocity range:  2676.0 - 2858.7 km/s