Object: NGC4194 On scan num: 212 214 216 218 220 222 Off scan num: 213 215 217 219 221 223 R.A.: 12.235977 hrs Dec.: 54.526384 deg On azimuth: 33.319693 deg On zenith dist.: 71.920333 deg Off azimuth: 33.295733 deg Off zenith dist.: 71.945353 deg MJD: 52551 UTC: 0.372512 Center freq.: 1408.688299 MHz Doppler: 0.00004076 Num. correlators: 2 Spectrom. atten.: 35 35 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1620 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 5 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: 0.060 Jy Lower 20% velocity: 2426.3 km/s Upper 20% velocity: 2574.2 km/s Systemic velocity: 2500.3 km/s Line width (20%): 147.9 km/s Profile integral: 5.86 Jy * km/s A: 5.36 B: 6.04 Ratio B/A: 1.127 Flux integral velocity range: 2357.2 - 2642.2 km/s