Object: N5157 On scan num: 10 12 14 16 18 20 125 127 129 131 133 135 Off scan num: 11 13 15 17 19 21 126 128 130 132 134 136 R.A.: 13.454701 hrs Dec.: 32.030383 deg On azimuth: 290.827678 deg On azimuth: 98.377079 deg On zenith dist.: 62.947022 deg On zenith dist.: 22.447733 deg Off azimuth: 290.803593 deg Off azimuth: 98.339366 deg Off zenith dist.: 62.910250 deg Off zenith dist.: 22.479917 deg MJD: 52745 MJD: 52264 UTC: 0.433843 UTC: 0.456725 Center freq.: 1386.824663 MHz Doppler: -0.00002702 Doppler: 0.00007989 Num. correlators: 2 Spectrom. atten.: 27 38 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 3180 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 13 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 6 channels by interpolation between the nearest valid channels
Peak intensity: 0.009 Jy Lower 20% velocity: 7041.8 km/s Upper 20% velocity: 7583.8 km/s Systemic velocity: 7312.8 km/s Line width (20%): 542.0 km/s Profile integral: 3.04 Jy * km/s A: 2.19 B: 3.30 Ratio B/A: 1.509 Flux integral velocity range: 7017.9 - 7606.2 km/s
Average of two observing sessions at 10 MHz bandwidth: scans 10 - 21 and 125 - 135, using FFT spectrometer.