04085+3834 Scan 1078


Observing log information

  Object:           04085+3834
  On scan num:      1078 1080 1082 1084 1086 1088
  Off scan num:     1079 1081 1083 1085 1087 1089
  R.A.:             4.203437 hrs
  Dec.:             38.700413 deg
  On azimuth:       297.251367 deg
  On zenith dist.:  59.309854 deg
  Off azimuth:      297.235452 deg
  Off zenith dist.: 59.283505 deg
  MJD:              52245
  UTC:              0.415694
  Center freq.:     1403.081859 MHz
  Doppler:          -0.00000513
  Num. correlators: 2
  Spectrom. atten.: 35 41 dB
  Bandwidth:        40.0 MHz
  Num. channels:    1024
  Eff. integration: 1800 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:      0.017 Jy
  Lower 20% velocity: 5448.8 km/s
  Upper 20% velocity: 6740.9 km/s
   Systemic velocity: 6094.9 km/s
   Line width (20%):  1292.1 km/s
  Profile integral:   14.05 Jy * km/s
                 A:    8.23
                 B:   14.19
         Ratio B/A:   1.724
  Flux integral
     velocity range:  5040.9 - 7091.9 km/s


looks like several profiles blended together