Object: UGC11124B On scan num: 311 Off scan num: 312 R.A.: 18.129172 hrs Dec.: 35.391789 deg On azimuth: 296.257788 deg On zenith dist.: 64.576068 deg Off azimuth: 296.234943 deg Off zenith dist.: 64.540498 deg MJD: 52457 UTC: 0.430046 Center freq.: 1413.370752 MHz Doppler: -0.00000736 Num. correlators: 2 Spectrom. atten.: 35 42 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: 0.039 Jy Lower 20% velocity: 1470.7 km/s Upper 20% velocity: 1522.8 km/s Systemic velocity: 1496.8 km/s Line width (20%): 52.1 km/s Profile integral: 1.33 Jy * km/s A: 1.39 B: 1.36 Ratio B/A: 0.977 Flux integral velocity range: 1462.9 - 1533.7 km/s
could be more HI at higher velocity