SpecStacker 0.1.0

This is a new rest-frame spectral stacking code.

SpecStacker: The Spectral Stacking Code

This is a new rest-frame spectral stacking code. For a quick start-up tutorial, see example notebook.

The code takes arrays of observed-frame wavelength, flux density, flux uncertainties and the corresponding redshifts as input parameters, shifts all spectra to the rest-frame, and resamples them onto a common wavelegth grid based on the redshift distribution and an input pixel size (e.g. 1Å). The normalisation of each spectrum is performed by taking the median, computed at the reddest possible end of the area where all spectra populate the common wavelength grid, with prominent emission lines masked out. The composite spectrum is then created by taking the median of all normalized flux density values that fall within a given wavelength bin, and using bootstrapping to calculate the uncertainties. However, to ensure that the final uncertainties are realistic, an additional built-in simulation is used.

If you make use of SpecStacker in your research, please include the following citation:

@ARTICLE{2024MNRAS.528.4547A,
   author = {{Arnaudova}, M.~I. and {Smith}, D.~J.~B. and {Hardcastle}, M.~J. and {Das}, S. and {Drake}, A. and {Duncan}, K. and {G{\"u}rkan}, G. and {Magliocchetti}, M. and {Morabito}, L.~K. and {Petley}, J.~W. and {Shenoy}, S. and {Tasse}, C.},
    title = "{Exploring the radio loudness of SDSS quasars with spectral stacking}",
  journal = {\mnras},
 keywords = {techniques: spectroscopic, galaxies: active, quasars: general, radio continuum: galaxies, Astrophysics - Astrophysics of Galaxies},
     year = 2024,
    month = mar,
   volume = {528},
   number = {3},
    pages = {4547-4567},
      doi = {10.1093/mnras/stae233},
archivePrefix = {arXiv},
   eprint = {2401.08774},
primaryClass = {astro-ph.GA},
   adsurl = {https://ui.adsabs.harvard.edu/abs/2024MNRAS.528.4547A},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}