Object: NGC2366 On scan num: 135 Off scan num: 136 R.A.: 7.481589 hrs Dec.: 69.215142 deg On azimuth: 333.207958 deg On zenith dist.: 45.922686 deg Off azimuth: 333.211218 deg Off zenith dist.: 45.899462 deg MJD: 52519 UTC: 0.765903 Center freq.: 1420.014419 MHz Doppler: 0.00005793 Num. correlators: 2 Spectrom. atten.: 37 42 dB Bandwidth: 10.0 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 second-order least squares fit baseline removed using most of the baseline shown in Figure 1.
Peak intensity: 2.336 Jy Lower 20% velocity: 47.4 km/s Upper 20% velocity: 158.9 km/s Systemic velocity: 103.2 km/s Line width (20%): 111.5 km/s Profile integral: 207.28 Jy * km/s A: 189.09 B: 209.76 Ratio B/A: 1.109 Flux integral velocity range: 23.7 - 178.4 km/s