Object: NGC1155 On scan num: 96 98 100 102 104 106 Off scan num: 97 99 101 103 105 107 R.A.: 2.970258 hrs Dec.: -10.349911 deg On azimuth: 149.177261 deg On zenith dist.: 53.927583 deg Off azimuth: 149.140075 deg Off zenith dist.: 53.941127 deg MJD: 52511 UTC: 0.348438 Center freq.: 1399.288589 MHz Doppler: 0.00008120 Num. correlators: 2 Spectrom. atten.: 35 42 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1740 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 2 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: 0.075 Jy Lower 20% velocity: 4558.4 km/s Upper 20% velocity: 4723.8 km/s Systemic velocity: 4641.1 km/s Line width (20%): 165.4 km/s Profile integral: 8.85 Jy * km/s A: 8.16 B: 8.94 Ratio B/A: 1.095 Flux integral velocity range: 4525.3 - 4769.7 km/s