Object: Arp238 On scan num: 228 230 232 234 236 238 Off scan num: 229 231 233 235 237 239 R.A.: 13.259092 hrs Dec.: 62.126869 deg On azimuth: 30.248515 deg On zenith dist.: 63.171484 deg Off azimuth: 30.230900 deg Off zenith dist.: 63.195889 deg MJD: 52617 UTC: 0.262477 Center freq.: 1377.958592 MHz Doppler: 0.00004877 Num. correlators: 2 Spectrom. atten.: 38 40 dB Bandwidth: 5.0 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: 0.009 Jy Lower 20% velocity: 9208.4 km/s Upper 20% velocity: 9603.8 km/s Systemic velocity: 9406.1 km/s Line width (20%): 395.4 km/s Profile integral: 2.30 Jy * km/s A: 2.33 B: 2.37 Ratio B/A: 1.018 Flux integral velocity range: 9191.5 - 9613.5 km/s