EmissionLBV

modspectra.EmissionLBV(lbd_coords_withvel, density_gridin, cdelt, vel_disp, vmin, vmax, vel_resolution, L_range, B_range, species='hi', visualize=False, T_gas=<Quantity 120. K>, memmap=False, da_chunks_xyz=50, redden=None, case='B')

Creates a Longitude-Latitude-Velocity SpectralCube object of neutral (HI 21cm) or ionized (H-Alpha) gas emission Uses output calculated from ‘modspectra.cube.EllipticalLBD’

Uses numexpr package to evaluate math

Parameters:

lbd_coords_withvel: :class:’~astropy.coordinates.GalacticLSR’

astropy.coord array containing all coordinates corresponding to fabricated grid of points

dens_grid: ‘numpy.ndarray’

ndarray with shape (resolution) containing density of points in Longitude-Latitude-Distance grid axes order swapped to be ready for SpectralCube creation

cdelt: ‘numpy.ndarray’

ndarray with shape (3) containing the step size for Longitude, Latitude, and Distance used in the grid Used for WCS object creation in later instances

vel_disp: ‘number, Quantity

Velocity dispersion of the gas in units of km/s (if not Quantity)

vmin: ‘number, Quantity’

Min Velocity to create in grid in units of km/s (if not Quantity)

vmax: ‘number, Quantity’

Max Velocity to create in grid in units of km/s (if not Quantity)

vel_resolution: ‘int’

Resolution to Create along velocity axis

L_range: :list:’number’

Range of Longtiude to create grid over

B_range: :list:’number’

Range of Latitude to create grid over

species: ‘str’, optional, must be keyword of either ‘hi’ or ‘ha’

Specifies whether emission cube will be neutral (HI 21-cm) gas or ionized (H-Alpha) gas emission Defaults to HI netural gas

visualize: ‘bool’, optional, must be keyword

if using dask, returns dask visualization map

T_gas: ‘number, Quantity’, optional, must be keyword

Temperature of neutral HI 21-cm emitting gas in Kelvin Defaults to 120 K

memmap: ‘bool’, optional, must be keyword

if True, use dask for memory mapping when creating disk structure useful for higher resolution computes

da_chunks_xyz: ‘number’, optional, must be keyword

if memmap is True, sets the dask chunk size Default to 50, likely too small for efficiency

redden: ‘bool’, optional, must be keyword

if True, apply extinction corrections to emission using 3D dustmaps of Marshall et al. (2006) implemented via the dustmaps and extinction python packages

case: ‘str’, optional, must be keyword

if species is ‘ha’, then sets the recombination case to use Defaults to case B recombination

Returns:

emission_cube: :class:’numpy.ndarray’

Emission values in DBL cube

DBL_wcs: ‘~astropy.wcs.WCS’

WCS information associated with emission_cube