# 2019 Meeting of the Division of Particles & Fields of the American Physical Society

July 29, 2019 to August 2, 2019
Northeastern University
US/Eastern timezone

## Studying the influence of the void environment on the ratio of dark matter halo mass to stellar mass in SDSS MaNGA galaxies

Jul 29, 2019, 4:17 PM
17m
West Village G 102 (Northeastern University)

### West Village G 102

#### Northeastern University

Oral Presentation Dark Matter

### Speaker

Prof. Regina Demina (University of Rochester)

### Description

We study how the void environment affects the formation and evolution of
galaxies in the universe by comparing the ratio of dark matter halo mass to
stellar mass of galaxies in voids with galaxies in denser regions. Using
spectroscopic observations from the SDSS MaNGA DR 15, we estimate the dark
matter halo mass of \Nvoid void galaxies and \Nwall galaxies in denser regions.
We use the velocity of the H$\alpha$ emission line to measure the rotation
curve of the galaxies, since the kinematics of the interstellar medium is
smoother than stellar kinematics. We observe a relationship between a
galaxy's absolute magnitude and its ratio of dark matter halo mass to stellar
mass, where fainter galaxies have a higher fraction of dark matter than
brighter galaxies. We find that for a given range in absolute magnitude, void
galaxies have similar ratios of dark matter halo mass to stellar mass to
galaxies in denser regions.

### Primary author

Prof. Regina Demina (University of Rochester)

### Co-authors

Dr Kelly Douglas (University of Rochester) Mr Jacob Smith (University of Rochester)

### Presentation materials

 Rotation_curves_DPF2019.pdf Rotation_curves_DPF2019.pptx