N2713 Scan 504


Observing log information

  Object:           N2713
  On scan num:      504 506 508 510 512 514 516 518 520 522 524 526
  Off scan num:     505 507 509 511 513 515 517 519 521 523 525 527
  R.A.:             8.955704 hrs
  Dec.:             2.921119 deg
  On azimuth:       180.072278 deg
  On zenith dist.:  35.423163 deg
  Off azimuth:      180.043116 deg
  Off zenith dist.: 35.423306 deg
  MJD:              52293
  UTC:              0.264329
  Center freq.:     1402.104098 MHz
  Doppler:          0.00002896
  Num. correlators: 2
  Spectrom. atten.: 34 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 3300 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 10 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. Narrow band interference was removed from 14 channels by interpolation between the nearest valid channels

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.030 Jy
  Lower 20% velocity: 3600.8 km/s
  Upper 20% velocity: 4241.9 km/s
   Systemic velocity: 3921.4 km/s
   Line width (20%):   641.1 km/s
  Profile integral:   10.45 Jy * km/s
                 A:    8.55
                 B:   10.19
         Ratio B/A:   1.192
  Flux integral
     velocity range:  3569.0 - 4277.7 km/s