iMaNGA: mock MaNGA galaxies based on IllustrisTNG-50 and MaStar SSPs. II. the catalogue

Lorenza Nanni, Daniel Thomas, James Trayford, Claudia Maraston, Justus Neumann, David R. Law, Lewis Hill, Annalisa Pillepich, Renbin Yan, Yanping Chen, Dan Lazarz

Submitted on 23 November 2022


To probe the current theory on galaxy formation and evolution, an increased synergy between observations and simulations is necessary. For this reason, in our previous paper of this series, we presented a method to mock SDSS-IV/MaNGA integral-field spectroscopic galaxy observations from cosmological simulations of galaxy formation. Here we present the resulting mock galaxy catalogue. This catalogue consists of 1,000 unique galaxies in IllustrisTNG-50 falling into the SDSS-IV/MaNGA-primary target footprint, defined in the redshift and i-band absolute magnitude space. In this paper, we describe the general characteristics of the catalogue, in terms of morphology, kinematics, and stellar population properties. We also investigate our ability to recover the galaxy characteristics, as given by the simulations, analysing the synthetic spectra. We show that the `intrinsic' and recovered kinematics, age and metallicity are consistent within 1σ, with residuals over all tassels (8 million) consistent with 0 at the 68% confidence level. We also compare `intrinsic' and recovered star formation histories, finding a close resemblance. Therefore, our mocking and spectral fitting processes do not distort intrinsic galaxy properties, hence we can use these results for scientific analysis. In the next papers of this series, we will present a comprehensive comparison and scientific analysis of TNG50 simulations with MaNGA observational results.


Comment: arXiv admin note: text overlap with arXiv:2203.11575

Subject: Astrophysics - Astrophysics of Galaxies