FAST-data-reduction

Notes for Five-hundred-meter Aperture Spherical Radio Telescope data reduction.

Some FAST observation tools:

• Visibility of FAST: FAST-obs-plan.ipynb

• Build ds9 region file with ra dec of beam 01: FAST-Beam-regionfile.ipynb

• IDL code to correct the velocity into Local Standard of Rest Velocity: dopplerfast.pro; python code is included in the ipynb file in ON-OFF mode.

• FAST calibration file can be downloaded here: https://fast.bao.ac.cn/cms/category/telescope_performence_en/noise_diode_calibration_report_en/ The noise information data are ascii files, with interesting format. So I have to write a code to load the data in Load-FAST-Calib.ipynb

Obs by Tracking mode.

I use the tracking mode for long time integration to the target smaller than one beam.

ON-OFF mode.

I use ON-OFF mode to observe some local galaxies larger than several beam size.

During the ON-OFF to the target, I set: 2s period noise diode and 1s extract 1 spectrum.

Here are examples for one galaxy FAST observations pointing at the galaxy center and one spiral arm, corresponding to Beam M09 and M10.

I learnt how to reduce FAST data from Qian, Lei at about 2019.04.21, when I got some FAST observation time and have no idea how to observe by FAST. I further learnt the data reduction process by the FAST training school at about 2019.06.16. The ON-OFF code are mainly comes from the example code given by Tang, Ning-Yu. I explained how did I reduce the data in the appendix of Cheng et al. (2020).

Reference:

Cheng et al. The atomic gas of star-forming galaxies at z∼0.05 as revealed by the Five-hundred-meter Aperture Spherical Radio Telescope 2020, A&A, 638L, 14C