Galaxy#

class silmaril.galaxy.Galaxy(filename, center, redshift, size, data_format='pos')#

Bases: object

Class representing a galaxy defined using particle data

Parameters:

filename (str) – name of the file containing the particle data
data_format (str) – format of the file containing particle data (options are “fid” and “pos”), defaults to “pos”
center (astropy.coordinates.SkyCoord) – coordinates of the center of the galaxy
redshift (float) – redshift of the galaxy
size (float) – physical size of the galaxy in pc

data#: particle data

data_format#: format of the file containing particle data

data_columns#: names of the columns of the particle data

ages#: array of ages in Myr

positions#: array of (x, y, z) coordinates for particle data

center#: coordinates of the center of the galaxy

redshift#: redshift of the galaxy

size#: physical size of the galaxy in pc

angular_size#: angular size of the galaxy in arcseconds

luminosity_distance#: luminosity distance of the galaxy in pc

__init__(filename, center, redshift, size, data_format='pos')#

Methods

`__init__`(filename, center, redshift, size[, ...])
`create_image`(resolution[, zoom_factor, ...])	Returns an image of the galaxy as a 2d array of fluxes in Jy.
`grid`(resolution[, zoom_factor])	Returns a grid of points on the sky at a given resolution and zoom factor.
`pixel_scale`(resolution[, zoom_factor])	Computes the pixel scale of an image of the galaxy at a given resolution and zoom factor.
`plot`(resolution[, norm, zoom_factor])	Plots the galaxy at a given resolution and zoom factor.

create_image(resolution, zoom_factor=1, filter_name='F200W')#

Returns an image of the galaxy as a 2d array of fluxes in Jy.

Parameters:

resolution (int) – number of pixels on each side of the image
filter_name (str) – name of the JWST filter to use (uses luminosity lookup table if set to None), defaults to “F200W”
zoom_factor (float, optional) – zoom factor of the image, defaults to 1

Returns:

image of the galaxy

Return type:

numpy.ndarray

grid(resolution, zoom_factor=1)#

Returns a grid of points on the sky at a given resolution and zoom factor.

Parameters:

resolution (int) – number of pixels on each side of the image
zoom_factor (float, optional) – zoom factor of the image, defaults to 1

Returns:

grid of points on the sky

Return type:

imaging.Grid

pixel_scale(resolution, zoom_factor=1)#

Computes the pixel scale of an image of the galaxy at a given resolution and zoom factor.

Parameters:

resolution (int) – number of pixels on each side of the image
zoom_factor (float, optional) – zoom factor of the image, defaults to 1

Returns:

pixel scale of the image

Return type:

float

plot(resolution, norm=None, zoom_factor=1)#

Plots the galaxy at a given resolution and zoom factor.

Parameters:

resolution (int) – number of pixels on each side of the image
norm (matplotlib.colors.Normalize, optional) – normalization of the image, defaults to None
zoom_factor (float, optional) – zoom factor of the image, defaults to 1

Returns:

figure and axes of the plot

Return type:

matplotlib.pyplot.figure, matplotlib.pyplot.axes