Yesukhei Jagvaral's research while affiliated with Carnegie Mellon University and other places

Publications (6)

Article
In order to prepare for the upcoming wide-field cosmological surveys, large simulations of the Universe with realistic galaxy populations are required. In particular, the tendency of galaxies to naturally align towards overdensities, an effect called intrinsic alignments (IA), can be a major source of systematics in the weak lensing analysis. As th...
Article
Galaxies exhibit coherent alignments with local structure in the Universe. This effect, called Intrinsic Alignments (IA), is an important contributor to the systematic uncertainties for wide-field weak lensing surveys. On cosmological distance scales, intrinsic shape alignments have been observed in red galaxies, which are usually bulge-dominated;...
Preprint
Full-text available
In order to prepare for the upcoming wide-field cosmological surveys, large simulations of the Universe with realistic galaxy populations are required. In particular, the tendency of galaxies to naturally align towards overdensities, an effect called intrinsic alignments (IA), can be a major source of systematics in the weak lensing analysis. As th...
Preprint
Full-text available
Galaxies exhibit coherent alignments with local structure in the Universe. This effect, called Intrinsic Alignments (IA), is an important contributor to the systematic uncertainties for wide-field weak lensing surveys. On cosmological distance scales, intrinsic shape alignments have been observed in red galaxies, which are usually bulge-dominated;...
Article
In the era of precision cosmology and ever-improving cosmological simulations, a better understanding of different galaxy components such as bulges and discs will give us new insight into galactic formation and evolution. Based on the fact that the stellar populations of the constituent components of galaxies differ by their dynamical properties, w...
Preprint
Full-text available
In the era of precision cosmology and ever-improving cosmological simulations, a better understanding of different galaxy components such as bulges and discs will give us new insight into galactic formation and evolution. Based on the fact that the stellar populations of the constituent components of galaxies differ by their dynamical properties, w...

Citations

... That is because a graph is a natural descriptor of the systems at hand -any progenitor system at a high redshift can be regarded as a graph, with individual progenitors as nodes on the graph (see Fig. 1). Noting this connection, various works have started to apply GNN to astronomy (Cranmer et al., 2020;Villanueva-Domingo et al., 2021;Jagvaral et al., 2022). However, almost all of these GNN methods employed thus far are discriminative, i.e., it infers the labels from the graph. ...
... However, if the observed nonrandom orientations of the galaxy stellar spins with respect to the cosmic web do not take on the essential aspect of the theoretically predicted intrinsic spin alignments of the galactic halos, as hinted by Lee et al. (2022), then it requires a modification of the conventional assumption and a new interpretation of the observational evidence, which, of course, should be preceded by physically understanding how the galaxy stellar spins acquire the peculiar tidal connection. Among many possible factors that may affect the evolution of the galaxy stellar spin vectors and their deviations from the DM counterparts, here we consider the merging events that most of the galaxies experience in their growths, in light of the previous results based on hydrodynamical simulations that the alignment strength and tendency of the galaxies depend strongly on their dynamics and progenitor histories (Chisari et al. 2016;Bhowmick et al. 2020;Jagvaral et al. 2022). ...