SDSSphototools

Yukei S. Murakami ([email protected])

A set of helper tools to perform aperture photometry on SDSS images. This tool is developed to provide photometric SED of the local environment where transient objects (SNe) are detected.

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Requirements

Dependencies and required python packages

• python3 (tested w/ 3.7)
• numpy
• matplotlib
• pandas
• astropy
• photutils
• os
• glob
• bz2
• bs4
• urllib

TODO: add requirements.txt

usage

import SDSSphototools as spt
import astropy.units as u

RA = 359.738
Dec = -2.248
z = 0.0254
r = 1.5 * u.kpc
name = 'SN2003he_host'

files,magdata = spt.do_photometry_radec(RA,Dec,z,r,name=name,show_plots=True)

The program will print magnitudes in different methods, downloaded image containing the target coordinate, and masked image of the aperture.

e.g.

* querying data...
* downloading image files...
* decompressing image files...
* performing photometry...
              u       g        r        i        z
asinh   19.1982  17.943  17.2641  16.9038  16.6108
pogson  19.1982  17.943  17.2641  16.9038  16.6108

issues & todo

• SN subtraction
• psf mag, other methods
• more flexible aperture arguments (maybe add r_angle=None as an optional argument?)
• get uncertainties