Object: U668o On scan num: 95 Off scan num: 96 R.A.: 1.081774 hrs Dec.: 2.134699 deg On azimuth: 241.649104 deg On zenith dist.: 56.057432 deg Off azimuth: 241.504977 deg Off zenith dist.: 55.941851 deg MJD: 52233 UTC: 0.231065 Center freq.: 1421.417218 MHz Doppler: -0.00006905 Num. correlators: 2 Spectrom. atten.: 38 45 dB Bandwidth: 2.5 MHz Num. channels: 1024 Eff. integration: 240 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: 6.558 Jy Lower 20% velocity: -247.9 km/s Upper 20% velocity: -215.4 km/s Systemic velocity: -231.6 km/s Line width (20%): 32.5 km/s Profile integral: 154.99 Jy * km/s A: 122.90 B: 153.89 Ratio B/A: 1.252 Flux integral velocity range: -274.1 - -191.8 km/s