对于一个项目,我们被分配去检查极化星团,我们想确定这个星团有多大。 为此,我们必须找到一个区域的恒星密度,以查看星团结束的位置。
我们计划用天体学和天体测量学来做这件事,但我们以前没有用过这些包。有人可以帮忙提供示例代码吗?
我们尝试查找参考资料,但很难找到在我们的水平上解释它的来源
要使用天体学和天体测量法估算一个区域的恒星密度,您可以按照以下步骤操作:
下面是一些演示如何执行此操作的示例代码:
import astropy.units as u
import astropy.coordinates as coord
from astropy.io import fits
from astrometry import PlateSolve, SourceDetector
# Load the image file
image_file = 'my_image.fits'
with fits.open(image_file) as hdul:
image_data = hdul[0].data
# Create a PlateSolve object and solve the plate
solver = PlateSolve()
solver.set_image(image_data)
plate_solution = solver.solve()
# Create a SourceDetector object and detect sources in the image
detector = SourceDetector()
detector.set_image(image_data)
sources = detector.detect_sources()
# Convert the source positions to sky coordinates
positions = coord.SkyCoord(sources['ra'], sources['dec'], unit='deg')
# Compute the star density in units of stars per square arcminute
area = (image_data.shape[0] * plate_solution.pixel_scale * u.arcsec)**2
star_density = len(sources) / area.to(u.arcmin**2)
# Print the star density
print(f'Star density: {star_density:.2f} stars/arcmin^2')