N7723 Scan 4426

Contents

Observing log information

  Object:           N7723
  On scan num:      4426 4428 4430 4432 4434 4436 4438 4440 4442 4444
  Off scan num:     4427 4429 4431 4433 4435 4437 4439 4441 4443 4445
  R.A.:             23.649066 hrs
  Dec.:             -12.959710 deg
  On azimuth:       223.782749 deg
  On zenith dist.:  63.061015 deg
  Off azimuth:      223.744639 deg
  Off zenith dist.: 63.038201 deg
  MJD:              52534
  UTC:              0.325625
  Center freq.:     1411.634163 MHz
  Doppler:          -0.00000948
  Num. correlators: 2
  Spectrom. atten.: 35 42 dB
  Bandwidth:         5.0 MHz
  Num. channels:    1024
  Eff. integration: 3000 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: 1693.7 km/s
  Upper 20% velocity: 2024.5 km/s
   Systemic velocity: 1859.1 km/s
   Line width (20%):   330.8 km/s
  Profile integral:    8.67 Jy * km/s
                 A:    7.97
                 B:    8.74
         Ratio B/A:   1.096
  Flux integral
     velocity range:  1672.3 - 2036.5 km/s

Comments