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Full-Text Articles in Physical Sciences and Mathematics
Nitrogen-To-Oxygen Abundance Ratio Variation In Quiescent Galaxies, Renbin Yan
Nitrogen-To-Oxygen Abundance Ratio Variation In Quiescent Galaxies, Renbin Yan
Physics and Astronomy Faculty Publications
For the first time, we establish a gas-phase abundance pattern calibration for quiescent galaxies using optical emission lines. Quiescent galaxies have warm ionized gas showing line ratios similar to low-ionization nuclear emission line regions. The ionization mechanism for the gas is still an unsettled puzzle. Despite the uncertainty in the ionization mechanism, we argue that we can still infer certain gas-phase abundance pattern from first principles. We show that the relative trend in N/O abundance can still be reliably measured based on [N II] λλ6548,6583/[O II] λλ3726,3729 and a direct measurement of the electron temperature. We construct a composite direct …
Sdss-Iv Manga: Uncovering The Angular Momentum Content Of Central And Satellite Early-Type Galaxies, J. E. Greene, A. Leauthaud, E. Emsellem, J. Ge, A. Aragón-Salamanca, J. Greco, Y. -T. Lin, S. Mao, K. Masters, M. Merrifield, S. More, N. Okabe, D. P. Schneider, D. Thomas, D. A. Wake, K. Pan, D. Bizyaev, D. Oravetz, A. Simmons, Renbin Yan, F. Van Den Bosch
Sdss-Iv Manga: Uncovering The Angular Momentum Content Of Central And Satellite Early-Type Galaxies, J. E. Greene, A. Leauthaud, E. Emsellem, J. Ge, A. Aragón-Salamanca, J. Greco, Y. -T. Lin, S. Mao, K. Masters, M. Merrifield, S. More, N. Okabe, D. P. Schneider, D. Thomas, D. A. Wake, K. Pan, D. Bizyaev, D. Oravetz, A. Simmons, Renbin Yan, F. Van Den Bosch
Physics and Astronomy Faculty Publications
We study 379 central and 159 satellite early-type galaxies with two-dimensional kinematics from the integral-field survey Mapping Nearby Galaxies at APO (MaNGA) to determine how their angular momentum content depends on stellar and halo mass. Using the Yang et al. group catalog, we identify central and satellite galaxies in groups with halo masses in the range 1012.5 h-1 M⊙ < M200b < 1015 h-1 M⊙. As in previous work, we see a sharp dependence on stellar mass, in the sense that ~70% of galaxies with stellar mass M* > 1011 h-2 M …