U00809 Scan 469


Observing log information

  Object:           U00809
  On scan num:      469 471 473 475 477
  Off scan num:     470 472 474 476 478
  R.A.:             1.264446 hrs
  Dec.:             33.810029 deg
  On azimuth:       88.270704 deg
  On zenith dist.:  28.540113 deg
  Off azimuth:      88.246472 deg
  Off zenith dist.: 28.573287 deg
  MJD:              52279
  UTC:              0.882523
  Center freq.:     1400.611349 MHz
  Doppler:          -0.00008844
  Num. correlators: 2
  Spectrom. atten.: 33 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 1500 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 17 channels by interpolation between the nearest valid channels

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.021 Jy
  Lower 20% velocity: 4041.6 km/s
  Upper 20% velocity: 4384.0 km/s
   Systemic velocity: 4212.8 km/s
   Line width (20%):   342.4 km/s
  Profile integral:    5.72 Jy * km/s
                 A:    3.83
                 B:    5.99
         Ratio B/A:   1.564
  Flux integral
     velocity range:  4019.7 - 4411.9 km/s


a lot of RFI