Object: N_992 On scan num: 550 552 554 556 558 560 Off scan num: 551 553 555 557 559 561 R.A.: 2.623809 hrs Dec.: 21.101257 deg On azimuth: 217.176680 deg On zenith dist.: 20.698025 deg Off azimuth: 217.165775 deg Off zenith dist.: 20.695942 deg MJD: 52267 UTC: 0.108866 Center freq.: 1400.905197 MHz Doppler: -0.00007605 Num. correlators: 2 Spectrom. atten.: 34 40 dB Bandwidth: 10.0 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 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: 0.084 Jy Lower 20% velocity: 3977.4 km/s Upper 20% velocity: 4308.1 km/s Systemic velocity: 4142.7 km/s Line width (20%): 330.7 km/s Profile integral: 18.75 Jy * km/s A: 15.14 B: 18.14 Ratio B/A: 1.198 Flux integral velocity range: 3919.5 - 4368.7 km/s
quite asymmetric profile