Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Mercado, Francisco J"'
Autor:
Fu, Sal Wanying, Weisz, Daniel R., Starkenburg, Else, Martin, Nicolas, Collins, Michelle L. M., Savino, Alessandro, Boylan-Kolchin, Michael, Côté, Patrick, Dolphin, Andrew E., Longeard, Nicolas, Mateo, Mario L., Mercado, Francisco J., Sandford, Nathan R., Skillman, Evan D.
We present $\sim300$ stellar metallicity measurements in two faint M31 dwarf galaxies, Andromeda XVI ($M_V = -7.5$) and Andromeda XXVIII ($M_V = -8.8$) derived using metallicity-sensitive Calcium H & K narrow-band Hubble Space Telescope imaging. Thes
Externí odkaz:
http://arxiv.org/abs/2407.04698
Autor:
Sands, Isabel S., Hopkins, Philip F., Shen, Xuejian, Boylan-Kolchin, Michael, Bullock, James, Faucher-Giguere, Claude-Andre, Mercado, Francisco J., Moreno, Jorge, Necib, Lina, Ou, Xiaowei, Wellons, Sarah, Wetzel, Andrew
While galaxy rotation curves provide one of the most powerful methods for measuring dark matter profiles in the inner regions of rotation-supported galaxies, at the dwarf scale there are factors that can complicate this analysis. Given the expectatio
Externí odkaz:
http://arxiv.org/abs/2404.16247
Autor:
Klein, Courtney, Bullock, James S., Moreno, Jorge, Mercado, Francisco J., Hopkins, Philip F., Cochrane, Rachel K., Benavides, Jose A.
The observationally-inferred size versus stellar-mass relationship (SMR) for low-mass galaxies provides an important test for galaxy formation models. However, the relationship relies on assumptions that relate observed luminosity profiles to underly
Externí odkaz:
http://arxiv.org/abs/2404.02373
Autor:
Fu, Sal Wanying, Weisz, Daniel R., Starkenburg, Else, Martin, Nicolas, Mercado, Francisco J., Savino, Alessandro, Boylan-Kolchin, Michael, Côté, Patrick, Dolphin, Andrew E., Longeard, Nicolas, Mateo, Mario L., Samuel, Jenna, Sandford, Nathan R.
We measure the metallicities of 374 red giant branch (RGB) stars in the isolated, quenched dwarf galaxy Tucana using Hubble Space Telescope (HST) narrow-band (F395N) Calcium H & K (CaHK) imaging. Our sample is a factor of $\sim7$ larger than what is
Externí odkaz:
http://arxiv.org/abs/2312.05981
Autor:
Mercado, Francisco J., Bullock, James S., Moreno, Jorge, Boylan-Kolchin, Michael, Hopkins, Philip F., Wetzel, Andrew, Faucher-Giguère, Claude-André, Samuel, Jenna
The Radial Acceleration Relation (RAR) connects the total gravitational acceleration of a galaxy at a given radius, $a_{\rm tot}(r)$, with that accounted for by baryons at the same radius, $a_{\rm bar}(r)$. The shape and tightness of the RAR for rota
Externí odkaz:
http://arxiv.org/abs/2307.09507
Autor:
Meskhidze, Helen, Mercado, Francisco J., Sameie, Omid, Robles, Victor H., Bullock, James S., Kaplinghat, Manoj, Weatherall, James O.
Self-interacting dark matter (SIDM) models have received great attention over the past decade as solutions to the small-scale puzzles of astrophysics. Though there are different implementations of dark matter (DM) self-interactions in N-body codes of
Externí odkaz:
http://arxiv.org/abs/2203.06035
Autor:
Moreno, Jorge, Danieli, Shany, Bullock, James S., Feldmann, Robert, Hopkins, Philip F., Catmabacak, Onur, Gurvich, Alexander, Lazar, Alexandres, Klein, Courtney, Hummels, Cameron B., Hafen, Zachary, Mercado, Francisco J., Yu, Sijie, Jiang, Fangzhou, Wheeler, Coral, Wetzel, Andrew, Angles-Alcazar, Daniel, Boylan-Kolchin, Michael, Quataert, Eliot, Faucher-Giguere, Claude-Andre, Keres, Dusan
The standard cold dark matter plus cosmological constant model predicts that galaxies form within dark-matter haloes, and that low-mass galaxies are more dark-matter dominated than massive ones. The unexpected discovery of two low-mass galaxies lacki
Externí odkaz:
http://arxiv.org/abs/2202.05836
Autor:
McKeown, Daniel, Bullock, James S., Mercado, Francisco J., Hafen, Zachary, Boylan-Kolchin, Michael, Wetzel, Andrew, Necib, Lina, Hopkins, Philip F., Yu, Sijie
We use FIRE-2 zoom cosmological simulations of Milky Way size galaxy halos to calculate astrophysical J-factors for dark matter annihilation and indirect detection studies. In addition to velocity-independent (s-wave) annihilation cross sections $\si
Externí odkaz:
http://arxiv.org/abs/2111.03076
Autor:
Mercado, Francisco J., Bullock, James S., Boylan-Kolchin, Michael, Moreno, Jorge, Wetzel, Andrew, El-Badry, Kareem, Graus, Andrew S., Fitts, Alex, Hopkins, Philip F., Faucher-Giguère, Claude-André
We explore the origin of stellar metallicity gradients in simulated and observed dwarf galaxies. We use FIRE-2 cosmological baryonic zoom-in simulations of 26 isolated galaxies as well as existing observational data for 10 Local Group dwarf galaxies.
Externí odkaz:
http://arxiv.org/abs/2009.01241
Autor:
Velázquez, José A. Flores, Gurvich, Alexander B., Faucher-Giguère, Claude-André, Bullock, James S., Starkenburg, Tjitske K., Moreno, Jorge, Lazar, Alexandres, Mercado, Francisco J., Stern, Jonathan, Sparre, Martin, Hayward, Christopher C., Wetzel, Andrew, El-Badry, Kareem
Understanding the rate at which stars form is central to studies of galaxy formation. Observationally, the star formation rates (SFRs) of galaxies are measured using the luminosity in different frequency bands, often under the assumption of a time-st
Externí odkaz:
http://arxiv.org/abs/2008.08582