Object: NGC7416 On scan num: 39 Off scan num: 40 R.A.: 22.928285 hrs Dec.: -5.495238 deg On azimuth: 158.478304 deg On zenith dist.: 46.085961 deg Off azimuth: 158.439334 deg Off zenith dist.: 46.094356 deg MJD: 52491 UTC: 0.261447 Center freq.: 1407.066582 MHz Doppler: 0.00004929 Num. correlators: 2 Spectrom. atten.: 40 37 dB Bandwidth: 5.0 MHz Num. channels: 1024 Eff. integration: 300 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 first-order least squares fit baseline removed using most of the baseline shown in Figure 1.
Peak intensity: 0.052 Jy Lower 20% velocity: 2668.8 km/s Upper 20% velocity: 3049.1 km/s Systemic velocity: 2858.9 km/s Line width (20%): 380.3 km/s Profile integral: 10.99 Jy * km/s A: 9.84 B: 11.35 Ratio B/A: 1.154 Flux integral velocity range: 2648.0 - 3063.9 km/s