Object: N3839 On scan num: 486 488 490 Off scan num: 487 489 491 R.A.: 11.731603 hrs Dec.: 10.786101 deg On azimuth: 177.990475 deg On zenith dist.: 27.586599 deg Off azimuth: 177.981316 deg Off zenith dist.: 27.586650 deg MJD: 52260 UTC: 0.467014 Center freq.: 1392.952496 MHz Doppler: 0.00009967 Num. correlators: 2 Spectrom. atten.: 33 38 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: 0.030 Jy Lower 20% velocity: 5732.6 km/s Upper 20% velocity: 6099.6 km/s Systemic velocity: 5916.1 km/s Line width (20%): 367.0 km/s Profile integral: 9.16 Jy * km/s A: 7.16 B: 9.50 Ratio B/A: 1.328 Flux integral velocity range: 5700.7 - 6127.1 km/s
seems to be an extended shoulder on high velocity wing