Object: Pisces On scan num: 600 Off scan num: 601 R.A.: 1.065697 hrs Dec.: 21.894697 deg On azimuth: 98.255627 deg On zenith dist.: 43.429298 deg Off azimuth: 98.221520 deg Off zenith dist.: 43.465209 deg MJD: 52498 UTC: 0.242894 Center freq.: 1419.580800 MHz Doppler: 0.00008591 Num. correlators: 2 Spectrom. atten.: 39 37 dB Bandwidth: 5.0 MHz Num. channels: 1024 Eff. integration: 300 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 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 1.
Peak intensity: 0.113 Jy Lower 20% velocity: -300.8 km/s Upper 20% velocity: -269.4 km/s Systemic velocity: -285.1 km/s Line width (20%): 31.4 km/s Profile integral: 2.26 Jy * km/s A: 2.20 B: 2.23 Ratio B/A: 1.014 Flux integral velocity range: -303.7 - -263.6 km/s
very little baseline on negative velocity side, could be a high velocity cloud