Object: NGC5157 On scan num: 59 61 63 65 67 69 Off scan num: 60 62 64 66 68 70 R.A.: 13.454819 hrs Dec.: 32.028070 deg On azimuth: 91.140132 deg On zenith dist.: 29.913603 deg Off azimuth: 91.115525 deg Off zenith dist.: 29.942991 deg MJD: 52249 UTC: 0.471111 Center freq.: 1386.966270 MHz Doppler: 0.00007508 Num. correlators: 2 Spectrom. atten.: 40 41 dB Bandwidth: 5.0 MHz Num. channels: 1024 Eff. integration: 1800 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 31 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: 0.008 Jy Lower 20% velocity: 7045.6 km/s Upper 20% velocity: 7563.6 km/s Systemic velocity: 7304.6 km/s Line width (20%): 518.0 km/s Profile integral: 2.76 Jy * km/s A: 2.51 B: 0.00 Ratio B/A: 0.000 Flux integral velocity range: 7025.8 - 7581.6 km/s
very low SNR, ch B is zero