Object: NGC1155 On scan num: 855 857 Off scan num: 856 858 R.A.: 2.970260 hrs Dec.: -10.349985 deg On azimuth: 194.582291 deg On zenith dist.: 49.798851 deg Off azimuth: 194.545144 deg Off zenith dist.: 49.793222 deg MJD: 52496 UTC: 0.489734 Center freq.: 1399.296251 MHz Doppler: 0.00008667 Num. correlators: 2 Spectrom. atten.: 35 42 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 480 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 4 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: 0.077 Jy Lower 20% velocity: 4557.2 km/s Upper 20% velocity: 4725.6 km/s Systemic velocity: 4641.4 km/s Line width (20%): 168.4 km/s Profile integral: 8.77 Jy * km/s A: 7.85 B: 9.09 Ratio B/A: 1.157 Flux integral velocity range: 4540.1 - 4750.5 km/s