Object: NGC3683 On scan num: 37 39 41 43 45 47 Off scan num: 38 40 42 44 46 48 R.A.: 11.458864 hrs Dec.: 56.878614 deg On azimuth: 388.281368 deg On zenith dist.: 73.449086 deg Off azimuth: 388.255302 deg Off zenith dist.: 73.472195 deg MJD: 52550 UTC: 0.320972 Center freq.: 1412.392392 MHz Doppler: 0.00005004 Num. correlators: 2 Spectrom. atten.: 35 42 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1620 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 6 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: 0.059 Jy Lower 20% velocity: 1520.4 km/s Upper 20% velocity: 1911.1 km/s Systemic velocity: 1715.7 km/s Line width (20%): 390.7 km/s Profile integral: 20.35 Jy * km/s A: 20.35 B: 18.46 Ratio B/A: 0.908 Flux integral velocity range: 1503.4 - 1922.4 km/s