Object: NGC5157 On scan num: 125 127 129 131 133 135 Off scan num: 126 128 130 132 134 136 R.A.: 13.454837 hrs Dec.: 32.028055 deg On azimuth: 98.377079 deg On zenith dist.: 22.447733 deg Off azimuth: 98.339366 deg Off zenith dist.: 22.479917 deg MJD: 52264 UTC: 0.456725 Center freq.: 1386.576697 MHz Doppler: 0.00007989 Num. correlators: 2 Spectrom. atten.: 33 40 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 1500 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 9 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. Narrow band interference was removed from 11 channels by interpolation between the nearest valid channels
Peak intensity: 0.008 Jy Lower 20% velocity: 7036.2 km/s Upper 20% velocity: 7567.0 km/s Systemic velocity: 7301.6 km/s Line width (20%): 530.8 km/s Profile integral: 2.93 Jy * km/s A: 2.06 B: 3.54 Ratio B/A: 1.720 Flux integral velocity range: 7016.2 - 7589.3 km/s
low velocity edge clobbered by RFI