Object: Arp098 On scan num: 2093 2095 2097 2099 Off scan num: 2094 2096 2098 2100 R.A.: 1.535700 hrs Dec.: 32.103377 deg On azimuth: 269.279166 deg On zenith dist.: 30.259726 deg Off azimuth: 269.249095 deg Off zenith dist.: 30.223367 deg MJD: 52598 UTC: 0.221748 Center freq.: 1363.239624 MHz Doppler: -0.00004008 Num. correlators: 2 Spectrom. atten.: 38 34 dB Bandwidth: 5.0 MHz Num. channels: 1024 Eff. integration: 1200 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 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.
Peak intensity: 0.009 Jy Lower 20% velocity: 12253.7 km/s Upper 20% velocity: 12497.9 km/s Systemic velocity: 12375.8 km/s Line width (20%): 244.2 km/s Profile integral: 1.26 Jy * km/s A: 0.98 B: 1.30 Ratio B/A: 1.316 Flux integral velocity range: 12228.7 - 12517.0 km/s
very low SNR