N7723 Scan 4582

Contents

Observing log information

  Object:           N7723
  On scan num:      4582 4584 4586 4588 4590 4592 4594 4596 4598 4600 4602 4604
  Off scan num:     4583 4585 4587 4589 4591 4593 4595 4597 4599 4601 4603 4605
  R.A.:             23.649069 hrs
  Dec.:             -12.959707 deg
  On azimuth:       213.817964 deg
  On zenith dist.:  57.996681 deg
  Off azimuth:      213.779148 deg
  Off zenith dist.: 57.980200 deg
  MJD:              52540
  UTC:              0.280683
  Center freq.:     1411.620558 MHz
  Doppler:          -0.00001912
  Num. correlators: 2
  Spectrom. atten.: 35 39 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 3600 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:      0.050 Jy
  Lower 20% velocity: 1692.4 km/s
  Upper 20% velocity: 2025.0 km/s
   Systemic velocity: 1858.7 km/s
   Line width (20%):   332.6 km/s
  Profile integral:    8.88 Jy * km/s
                 A:    8.36
                 B:    8.73
         Ratio B/A:   1.045
  Flux integral
     velocity range:  1677.5 - 2041.7 km/s

Comments