Object: NGC1156 On scan num: 31 33 35 Off scan num: 32 34 36 R.A.: 2.995179 hrs Dec.: 25.238156 deg On azimuth: 283.307226 deg On zenith dist.: 64.853825 deg Off azimuth: 283.282177 deg Off zenith dist.: 64.818714 deg MJD: 52510 UTC: 0.634884 Center freq.: 1418.764730 MHz Doppler: 0.00009406 Num. correlators: 2 Spectrom. atten.: 40 42 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 840 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 spectrum is the same as Figure 1 but with 1 60-second sub-integrations manually deleted because of interference or a bad baseline.
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 2.
Peak intensity: 0.879 Jy Lower 20% velocity: 317.9 km/s Upper 20% velocity: 427.0 km/s Systemic velocity: 372.5 km/s Line width (20%): 109.1 km/s Profile integral: 66.19 Jy * km/s A: 60.42 B: 67.08 Ratio B/A: 1.110 Flux integral velocity range: 273.8 - 465.9 km/s