04083+3838 Scan 2426


Observing log information

  Object:           04083+3838
  On scan num:      2426 2428 2430 2432 2434 2436 2438 2440 2442 2444
  Off scan num:     2427 2429 2431 2433 2435 2437 2439 2441 2443 2445
  R.A.:             4.200197 hrs
  Dec.:             38.769016 deg
  On azimuth:       285.063920 deg
  On zenith dist.:  34.900441 deg
  Off azimuth:      285.050893 deg
  Off zenith dist.: 34.871897 deg
  MJD:              52255
  UTC:              0.295694
  Center freq.:     1393.417401 MHz
  Doppler:          -0.00002137
  Num. correlators: 2
  Spectrom. atten.: 34 39 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 2400 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 19 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 4th-order least squares fit baseline removed using most of the baseline shown in Figure 2. Narrow band interference was removed from 4 channels by interpolation between the nearest valid channels

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.023 Jy
  Lower 20% velocity: 5431.6 km/s
  Upper 20% velocity: 6066.4 km/s
   Systemic velocity: 5749.0 km/s
   Line width (20%):   634.9 km/s
  Profile integral:   12.02 Jy * km/s
                 A:    8.75
                 B:    9.92
         Ratio B/A:   1.134
  Flux integral
     velocity range:  5402.3 - 6136.7 km/s


two profiles, only measured largest one