Object: NGC278 On scan num: 421 Off scan num: 422 R.A.: 0.867950 hrs Dec.: 47.551165 deg On azimuth: 304.645283 deg On zenith dist.: 20.362228 deg Off azimuth: 304.674126 deg Off zenith dist.: 20.329767 deg MJD: 52485 UTC: 0.470810 Center freq.: 1417.488438 MHz Doppler: 0.00007652 Num. correlators: 2 Spectrom. atten.: 35 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: 0.346 Jy Lower 20% velocity: 561.9 km/s Upper 20% velocity: 711.7 km/s Systemic velocity: 636.8 km/s Line width (20%): 149.8 km/s Profile integral: 35.29 Jy * km/s A: 31.27 B: 35.86 Ratio B/A: 1.147 Flux integral velocity range: 520.0 - 749.7 km/s