Search Results for author: Michelle Ntampaka

Found 7 papers, 1 papers with code

A Hybrid Deep Learning Approach to Cosmological Constraints From Galaxy Redshift Surveys

no code implementations23 Sep 2019 Michelle Ntampaka, Daniel J. Eisenstein, Sihan Yuan, Lehman H. Garrison

We present a deep machine learning (ML)-based technique for accurately determining $\sigma_8$ and $\Omega_m$ from mock 3D galaxy surveys.

Cosmology and Nongalactic Astrophysics

Using X-Ray Morphological Parameters to Strengthen Galaxy Cluster Mass Estimates via Machine Learning

no code implementations7 Aug 2019 Sheridan B. Green, Michelle Ntampaka, Daisuke Nagai, Lorenzo Lovisari, Klaus Dolag, Dominique Eckert, John A. ZuHone

This procedure is performed for two different mock observation series in an effort to bracket the potential enhancement in mass predictions that can be made possible by including dynamical state information.

Cosmology and Nongalactic Astrophysics

A Robust and Efficient Deep Learning Method for Dynamical Mass Measurements of Galaxy Clusters

1 code implementation15 Feb 2019 Matthew Ho, Markus Michael Rau, Michelle Ntampaka, Arya Farahi, Hy Trac, Barnabas Poczos

Our first model, CNN$_\text{1D}$, infers cluster mass directly from the distribution of member galaxy line-of-sight velocities.

Cosmology and Nongalactic Astrophysics

A Machine Learning Approach for Dynamical Mass Measurements of Galaxy Clusters

no code implementations2 Oct 2014 Michelle Ntampaka, Hy Trac, Dougal J. Sutherland, Nicholas Battaglia, Barnabas Poczos, Jeff Schneider

In the conventional method, we use a standard M(sigma_v) power law scaling relation to infer cluster mass, M, from line-of-sight (LOS) galaxy velocity dispersion, sigma_v.

Cosmology and Nongalactic Astrophysics

A First Look at creating mock catalogs with machine learning techniques

no code implementations5 Mar 2013 Xiaoying Xu, Shirley Ho, Hy Trac, Jeff Schneider, Barnabas Poczos, Michelle Ntampaka

We investigate machine learning (ML) techniques for predicting the number of galaxies (N_gal) that occupy a halo, given the halo's properties.

Cosmology and Nongalactic Astrophysics

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