Object: N_877 On scan num: 538 540 542 Off scan num: 539 541 543 R.A.: 2.299620 hrs Dec.: 14.540601 deg On azimuth: 183.275771 deg On zenith dist.: 23.841694 deg Off azimuth: 183.274402 deg Off zenith dist.: 23.841800 deg MJD: 52267 UTC: 0.062419 Center freq.: 1401.905428 MHz Doppler: -0.00008311 Num. correlators: 2 Spectrom. atten.: 34 40 dB Bandwidth: 10.0 MHz Num. channels: 1024 Eff. integration: 900 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: 0.097 Jy Lower 20% velocity: 3610.4 km/s Upper 20% velocity: 4149.4 km/s Systemic velocity: 3879.9 km/s Line width (20%): 539.0 km/s Profile integral: 38.73 Jy * km/s A: 31.26 B: 40.32 Ratio B/A: 1.290 Flux integral velocity range: 3517.2 - 4215.1 km/s
extended wing at 20 percent level on low velocity side included in profile width