Object: NGC5157 On scan num: 252 254 256 258 260 262 264 266 268 270 272 274 Off scan num: 253 255 257 259 261 263 265 267 269 271 273 275 R.A.: 13.454819 hrs Dec.: 32.028014 deg On azimuth: 70.591995 deg On zenith dist.: 60.725006 deg Off azimuth: 70.570021 deg Off zenith dist.: 60.758867 deg MJD: 52617 UTC: 0.352477 Center freq.: 1386.968608 MHz Doppler: 0.00007677 Num. correlators: 2 Spectrom. atten.: 38 40 dB Bandwidth: 20.0 MHz Num. channels: 1024 Eff. integration: 3360 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 spectrum is the same as Figure 1 but with 8 60-second sub-integrations manually deleted because of interference or a bad baseline.
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 2.
Peak intensity: 0.008 Jy Lower 20% velocity: 7039.3 km/s Upper 20% velocity: 7560.3 km/s Systemic velocity: 7299.8 km/s Line width (20%): 521.0 km/s Profile integral: 2.67 Jy * km/s A: 2.37 B: 2.71 Ratio B/A: 1.142 Flux integral velocity range: 7017.2 - 7588.0 km/s