Object: N7518 On scan num: 303 305 307 Off scan num: 304 306 308 R.A.: 23.220555 hrs Dec.: 6.323924 deg On azimuth: 156.003326 deg On zenith dist.: 34.191346 deg Off azimuth: 155.981456 deg Off zenith dist.: 34.195363 deg MJD: 52259 UTC: 0.912847 Center freq.: 1403.732132 MHz Doppler: -0.00009879 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: 0.036 Jy Lower 20% velocity: 3497.6 km/s Upper 20% velocity: 3581.4 km/s Systemic velocity: 3539.5 km/s Line width (20%): 83.9 km/s Profile integral: 2.64 Jy * km/s A: 2.15 B: 2.47 Ratio B/A: 1.147 Flux integral velocity range: 3484.9 - 3592.6 km/s