Object: NGC693 On scan num: 516 518 520 522 524 526 Off scan num: 517 519 521 523 525 527 R.A.: 1.841951 hrs Dec.: 6.144995 deg On azimuth: 180.257596 deg On zenith dist.: 32.198851 deg Off azimuth: 180.225922 deg Off zenith dist.: 32.198896 deg MJD: 52522 UTC: 0.340984 Center freq.: 1413.117313 MHz Doppler: 0.00006884 Num. correlators: 2 Spectrom. atten.: 35 38 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: 0.050 Jy Lower 20% velocity: 1424.8 km/s Upper 20% velocity: 1696.4 km/s Systemic velocity: 1560.6 km/s Line width (20%): 271.6 km/s Profile integral: 11.31 Jy * km/s A: 10.67 B: 10.61 Ratio B/A: 0.994 Flux integral velocity range: 1390.0 - 1727.3 km/s