N6701 Scan 4260


Observing log information

  Object:           N6701
  On scan num:      4260 4262 4264
  Off scan num:     4261 4263 4265
  R.A.:             18.720084 hrs
  Dec.:             60.653040 deg
  On azimuth:       326.815218 deg
  On zenith dist.:  61.653035 deg
  Off azimuth:      326.798452 deg
  Off zenith dist.: 61.625773 deg
  MJD:              52533
  UTC:              0.292454
  Center freq.:     1401.769315 MHz
  Doppler:          -0.00000899
  Num. correlators: 2
  Spectrom. atten.: 35 42 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 900 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:      0.046 Jy
  Lower 20% velocity: 3853.5 km/s
  Upper 20% velocity: 4038.8 km/s
   Systemic velocity: 3946.2 km/s
   Line width (20%):   185.2 km/s
  Profile integral:    6.60 Jy * km/s
                 A:    5.77
                 B:    7.04
         Ratio B/A:   1.220
  Flux integral
     velocity range:  3786.3 - 4211.8 km/s


long high velocity wing