Object: N1691 On scan num: 13 15 17 Off scan num: 14 16 18 R.A.: 4.910806 hrs Dec.: 3.267043 deg On azimuth: 216.747747 deg On zenith dist.: 40.928518 deg Off azimuth: 216.707942 deg Off zenith dist.: 40.914970 deg MJD: 52510 UTC: 0.565035 Center freq.: 1398.787088 MHz Doppler: 0.00009068 Num. correlators: 2 Spectrom. atten.: 40 42 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: 0.015 Jy Lower 20% velocity: 4426.5 km/s Upper 20% velocity: 4759.3 km/s Systemic velocity: 4592.9 km/s Line width (20%): 332.8 km/s Profile integral: 3.96 Jy * km/s A: 3.55 B: 4.70 Ratio B/A: 1.325 Flux integral velocity range: 4412.1 - 4775.4 km/s