Object: N1691 On scan num: 654 656 658 660 Off scan num: 655 657 659 661 R.A.: 4.910804 hrs Dec.: 3.267209 deg On azimuth: 178.457230 deg On zenith dist.: 35.077555 deg Off azimuth: 178.159436 deg Off zenith dist.: 35.080942 deg MJD: 52262 UTC: 0.178310 Center freq.: 1233.969842 MHz Doppler: -0.00002446 Num. correlators: 2 Spectrom. atten.: 2 7 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 900 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 6 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 3 channels by interpolation between the nearest valid channels
Peak intensity: 0.014 Jy Lower 20% velocity: 44879.8 km/s Upper 20% velocity: 45310.9 km/s Systemic velocity: 45095.4 km/s Line width (20%): 431.0 km/s Profile integral: 4.74 Jy * km/s A: 3.31 B: 5.19 Ratio B/A: 1.570 Flux integral velocity range: 44850.8 - 45330.9 km/s