Object: NGC4713 On scan num: 53 57 Off scan num: 54 58 R.A.: 12.832732 hrs Dec.: 5.310832 deg On azimuth: 194.820524 deg On zenith dist.: 33.882712 deg Off azimuth: 194.790999 deg Off zenith dist.: 33.879250 deg MJD: 52330 UTC: 0.347153 Center freq.: 1417.400611 MHz Doppler: 0.00005449 Num. correlators: 2 Spectrom. atten.: 41 42 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 600 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: 0.390 Jy Lower 20% velocity: 561.1 km/s Upper 20% velocity: 744.8 km/s Systemic velocity: 652.9 km/s Line width (20%): 183.7 km/s Profile integral: 52.46 Jy * km/s A: 47.39 B: 52.32 Ratio B/A: 1.104 Flux integral velocity range: 525.7 - 809.4 km/s
seems to be a long tail on the high velocity side