N05032 Scan 3308


Observing log information

  Object:           N05032
  On scan num:      3308 3310 3312 3314 3316 3318 3320 3322 3324 3326
  Off scan num:     3309 3311 3313 3315 3317 3319 3321 3323 3325 3327
  R.A.:             13.224148 hrs
  Dec.:             27.802351 deg
  On azimuth:       117.814521 deg
  On zenith dist.:  19.169191 deg
  Off azimuth:      117.786401 deg
  Off zenith dist.: 19.180697 deg
  MJD:              52277
  UTC:              0.431944
  Center freq.:     1390.734331 MHz
  Doppler:          0.00008456
  Num. correlators: 2
  Spectrom. atten.: 33 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 2700 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 9 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 4 channels by interpolation between the nearest valid channels

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.010 Jy
  Lower 20% velocity: 6125.1 km/s
  Upper 20% velocity: 6689.2 km/s
   Systemic velocity: 6407.1 km/s
   Line width (20%):   564.0 km/s
  Profile integral:    2.56 Jy * km/s
                 A:    1.60
                 B:    2.55
         Ratio B/A:   1.594
  Flux integral
     velocity range:  6099.3 - 6720.6 km/s


could be two separate profiles