mwa_search modules
data_load
Loads all the data required by mwa_search from the data directory.
dispersion_tools
- mwa_search.dispersion_tools.dd_plan(centrefreq, bandwidth, nfreqchan, timeres, lowDM, highDM, min_DM_step=0.02, max_DM_step=500.0, max_dms_per_job=5000)[source]
Work out the dedisperion plan
- Parameters:
- centrefreq: float
The center frequency of the observation in MHz
- bandwidth: float
The bandwidth of the observation in MHz
- nfreqchan: int
The number of frequency channels
- timeres: float
The time resolution of the observation in ms
- lowDM: float
The lowest dispersion measure
- highDM: float
The highest dispersion measure
- min_DM_step: float
Will overwrite the minimum DM step with this value
- max_dms_per_job: int
If Nsteps is greater than this value split it into multiple lines
- Returns:
- DD_plan_array: list list
dedispersion plan format: [[low_DM, high_DM, DM_step, nDM_step, timeres, downsample, nsub ]]
grid_tools
- mwa_search.grid_tools.get_grid(ra, dec, grid_sep, loop, grid_type='hex', verbose=True)[source]
ra: Right Acension in radians dec: Declination in radians grid_sep: seperation between grid pointings in radians loop: number of pointing loops grid_type: Possible grid types from [‘hex’, ‘cross’, ‘squaire’]
return [rads, decds] RAs and Decs in degrees
obs_tools
- mwa_search.obs_tools.calc_ta_fwhm(freq, array_phase='P2C')[source]
Calculates the approximate FWHM of the tied array beam in degrees.
- Parameters:
- freq: float
Frequency in MHz
- array_phase: string
OPTIONAL - The different array phase (from P1, P2C, P2E) to work out the maximum baseline length. Default = ‘P2C’
- Returns:
- fwhm: float
FWHM in degrees
- mwa_search.obs_tools.check_data(obsid, beg=None, dur=None, base_dir=None)[source]
Checks to see if all of the recombined files exist on disk
- Parameters:
- obsid: int
The observation ID to check
- beg: int
OPTIONAL - The beginning time of the files to check. If none, will use entire obs. Default: None
- dur: int
OPTIONAL - The duration in seconds to check since the beginning time. If none, will use entire obs. Default: None
- base_dir: string
OPTIONAL - The base directory to use. If none, will load from config. Default: None
- Returns:
- check: boolean
True - all files are on disk. False - not all files are on disk
- mwa_search.obs_tools.getTargetAZZA(ra, dec, time, lat=-26.7033, lon=116.671, height=377.827)[source]
Function to get the target position in alt/az at a given EarthLocation and Time.
Default lat,lon,height is the centre of MWA.
- Parameters:
- ra - target right ascension in astropy-readable format
- dec - target declination in astropy-readable format
- time - time of observation in UTC (i.e. a string on form: yyyy-mm-dd hh:mm:ss.ssss)
- lat - observatory latitude in degrees
- lon - observatory longitude in degrees
- Returns:
- a list containing four elements in the following order:
list[0] = target azimuth in radians list[1] = target zenith angle in radians list[2] = target azimuth in degrees list[3] = target zenith angle in degrees
- mwa_search.obs_tools.getTargetradec(az, za, time, lst, lat=-26.7033, lon=116.671, height=377.827)[source]
Function to get the target position in ra dec at a given EarthLocation and Time.
Default lat,lon,height is the centre of MWA.
- Parameters:
- az - target aximuth in radians
- za - target zenith in radians
- time - time of observation in UTC (i.e. a string on form: yyyy-mm-dd hh:mm:ss.ssss)
- lat - observatory latitude in degrees
- lon - observatory longitude in degrees
- Returns:
- a list containing four elements in the following order:
list[0] = target ra in degrees list[1] = target dec in degrees