Object: NGC986 On scan num: 974 976 978 980 982 984 Off scan num: 975 977 979 981 983 985 R.A.: 2.559485 hrs Dec.: -39.044486 deg On azimuth: 183.204806 deg On zenith dist.: 77.412740 deg Off azimuth: 183.168300 deg Off zenith dist.: 77.410931 deg MJD: 52532 UTC: 0.354271 Center freq.: 1411.005823 MHz Doppler: 0.00002588 Num. correlators: 2 Spectrom. atten.: 35 39 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1800 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: 0.127 Jy Lower 20% velocity: 1909.3 km/s Upper 20% velocity: 2047.7 km/s Systemic velocity: 1978.5 km/s Line width (20%): 138.3 km/s Profile integral: 13.47 Jy * km/s A: 12.45 B: 13.80 Ratio B/A: 1.109 Flux integral velocity range: 1860.9 - 2126.1 km/s