Object: SL1720+6236 On scan num: 948 950 952 954 956 958 960 962 Off scan num: 949 951 953 955 957 959 961 963 R.A.: 17.340493 hrs Dec.: 62.603707 deg On azimuth: 324.130341 deg On zenith dist.: 43.091565 deg Off azimuth: 324.238397 deg Off zenith dist.: 42.326765 deg MJD: 52244 UTC: 0.914039 Center freq.: 1403.424208 MHz Doppler: 0.00000487 Num. correlators: 2 Spectrom. atten.: 35 41 dB Bandwidth: 5.0 MHz Num. channels: 1024 Eff. integration: 2400 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: 0.006 Jy Lower 20% velocity: 3561.5 km/s Upper 20% velocity: 3660.8 km/s Systemic velocity: 3611.2 km/s Line width (20%): 99.4 km/s Profile integral: 0.47 Jy * km/s A: 0.33 B: 0.37 Ratio B/A: 1.111 Flux integral velocity range: 3537.2 - 3687.1 km/s
profile edge locations are only guesses, very low SNR