Object: NGC7218 On scan num: 164 166 168 170 172 174 Off scan num: 165 167 169 171 173 175 R.A.: 22.169922 hrs Dec.: -16.659920 deg On azimuth: 162.583753 deg On zenith dist.: 56.772866 deg Off azimuth: 162.546461 deg Off zenith dist.: 56.780667 deg MJD: 52377 UTC: 0.541910 Center freq.: 1412.687882 MHz Doppler: 0.00008010 Num. correlators: 2 Spectrom. atten.: 38 39 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1740 seconds
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
This spectrum is the same as Figure 1 but with 2 60-second sub-integrations manually deleted because of interference or a bad baseline.
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.
Peak intensity: 0.100 Jy Lower 20% velocity: 1518.4 km/s Upper 20% velocity: 1797.7 km/s Systemic velocity: 1658.0 km/s Line width (20%): 279.3 km/s Profile integral: 22.07 Jy * km/s A: 21.27 B: 20.97 Ratio B/A: 0.986 Flux integral velocity range: 1493.2 - 1828.7 km/s