U7370 Scan 367


Observing log information

  Object:           U7370
  On scan num:      367 369 371 374 376 378 380
  Off scan num:     368 370 372 375 377 379 381
  R.A.:             12.327869 hrs
  Dec.:             2.080295 deg
  On azimuth:       153.887313 deg
  On zenith dist.:  39.178123 deg
  Off azimuth:      153.849510 deg
  Off zenith dist.: 39.187114 deg
  MJD:              52771
  UTC:              0.051620
  Center freq.:     1409.832339 MHz
  Doppler:          -0.00007081
  Num. correlators: 2
  Spectrom. atten.: 0 0 dB
  Bandwidth:        12.5 MHz
  Num. channels:    8192
  Eff. integration: 2100 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:      0.017 Jy
  Lower 20% velocity: 2110.7 km/s
  Upper 20% velocity: 2305.9 km/s
   Systemic velocity: 2208.3 km/s
   Line width (20%):   195.3 km/s
  Profile integral:    2.83 Jy * km/s
                 A:    2.71
                 B:    2.95
         Ratio B/A:   1.089
  Flux integral
     velocity range:  2097.8 - 2318.1 km/s