UGC7370 Scan 1126


Observing log information

  Object:           UGC7370
  On scan num:      1126 1128 1130 1132 1134 1136
  Off scan num:     1127 1129 1131 1133 1135 1137
  R.A.:             12.327949 hrs
  Dec.:             2.081067 deg
  On azimuth:       216.644870 deg
  On zenith dist.:  42.247358 deg
  Off azimuth:      216.607756 deg
  Off zenith dist.: 42.234122 deg
  MJD:              52245
  UTC:              0.601042
  Center freq.:     1410.062113 MHz
  Doppler:          0.00009216
  Num. correlators: 2
  Spectrom. atten.: 35 41 dB
  Bandwidth:         5.0 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. Narrow band interference was removed from 18 channels by interpolation between the nearest valid channels

Figure 2. Measured spectrum

Measured parameters

  Peak intensity:      0.017 Jy
  Lower 20% velocity: 2102.1 km/s
  Upper 20% velocity: 2305.6 km/s
   Systemic velocity: 2203.9 km/s
   Line width (20%):   203.5 km/s
  Profile integral:    2.86 Jy * km/s
                 A:    1.45
                 B:    3.36
         Ratio B/A:   2.317
  Flux integral
     velocity range:  2083.6 - 2323.0 km/s


low SNR, edges uncertain