Zobrazeno 1 - 10
of 602
pro vyhledávání: '"P. A. Kolchin"'
Autor:
Boylan-Kolchin, Michael
In the local Universe, star formation is typically inefficient both globally and when considered as the fraction of gas converted into stars per local free-fall time. An important exception to this inefficiency is regions of high gravitational accele
Externí odkaz:
http://arxiv.org/abs/2407.10900
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:
Feldmann, Robert, Boylan-Kolchin, Michael, Bullock, James S., Çatmabacak, Onur, Faucher-Giguère, Claude-André, Hayward, Christopher C., Kereš, Dušan, Lazar, Alexandres, Liang, Lichen, Moreno, Jorge, Oesch, Pascal A., Quataert, Eliot, Shen, Xuejian, Sun, Guochao
Recent observations with the James Webb Space Telescope (JWST) have uncovered unexpectedly high cosmic star formation activity in the early Universe, mere hundreds of millions of years after the Big Bang. These observations are often understood to re
Externí odkaz:
http://arxiv.org/abs/2407.02674
Autor:
Shen, Xuejian, Vogelsberger, Mark, Boylan-Kolchin, Michael, Tacchella, Sandro, Naidu, Rohan P.
JWST has revealed a large population of ultra-violet (UV)-bright galaxies at $z\gtrsim 10$ and possibly overly massive galaxies at $z\gtrsim 7$, challenging standard galaxy formation models in the $\Lambda$CDM cosmology. We use an empirical galaxy fo
Externí odkaz:
http://arxiv.org/abs/2406.15548
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:
Staudt, Patrick G., Bullock, James S., Boylan-Kolchin, Michael, Kirkby, David, Wetzel, Andrew, Ou, Xiaowei
Publikováno v:
JCAP 08 (2024) 022
We use FIRE-2 zoom simulations of Milky Way size disk galaxies to derive easy-to-use relationships between the observed circular speed of the Galaxy at the Solar location, $v_\mathrm{c}$, and dark matter properties of relevance for direct detection e
Externí odkaz:
http://arxiv.org/abs/2403.04122
Autor:
Fujimoto, S., Ouchi, M., Kohno, K., Valentino, F., Giménez-Arteaga, C., Brammer, G. B., Furtak, L. J., Kohandel, M., Oguri, M., Pallottini, A., Richard, J., Zitrin, A., Bauer, F. E., Boylan-Kolchin, M., Dessauges-Zavadsky, M., Egami, E., Finkelstein, S. L., Ma, Z., Smail, I., Watson, D., Hutchison, T. A., Rigby, J. R., Welch, B. D., Ao, Y., Bradley, L. D., Caminha, G. B., Caputi, K. I., Espada, D., Endsley, R., Fudamoto, Y., González-López, J., Hatsukade, B., Koekemoer, A. M., Kokorev, V., Laporte, N., Lee, M., Magdis, G. E., Ono, Y., Rizzo, F., Shibuya, T., Shimasaku, K., Sun, F., Toft, S., Umehata, H., Wang, T., Yajima, H.
Early galaxy formation, initiated by the dark matter and gas assembly, evolves through frequent mergers and feedback processes into dynamically hot, chaotic structures. In contrast, dynamically cold, smooth rotating disks have been observed in massiv
Externí odkaz:
http://arxiv.org/abs/2402.18543
Fuzzy Dark Matter (FDM) comprised of ultralight ($m \sim 10^{-22}~\rm{eV}$) boson particles has received significant attention as a viable alternative to Cold Dark Matter (CDM), as it approximates CDM on large scales ($\gtrsim 1$ Mpc) while potential
Externí odkaz:
http://arxiv.org/abs/2402.16945
Autor:
Weisz, Daniel R., Dolphin, Andrew E., Savino, Alessandro, McQuinn, Kristen B. W., Newman, Max J. B., Williams, Benjamin F., Kallivayalil, Nitya, Anderson, Jay, Boyer, Martha L., Correnti, Matteo, Geha, Marla C., Sandstrom, Karin M., Cole, Andrew A., Warfield, Jack T., Skillman, Evan D., Cohen, Roger E., Beaton, Rachael, Bressan, Alessandro, Bolatto, Alberto, Boylan-Kolchin, Michael, Brooks, Alyson M., Bullock, James S., Conroy, Charlie, Cooper, Michael C., Dalcanton, Julianne J., Dotter, Aaron L., Fritz, Tobias K., Garling, Christopher T., Gennaro, Mario, Gilbert, Karoline M., Girardi, Leo, Johnson, Benjamin D., Johnson, L. Clifton, Kalirai, Jason, Kirby, Evan N., Lang, Dustin, Marigo, Paola, Richstein, Hannah, Schlafly, Edward F., Tollerud, Erik J., Wetzel, Andrew
We present NIRCam and NIRISS modules for DOLPHOT, a widely-used crowded field stellar photometry package. We describe details of the modules including pixel masking, astrometric alignment, star finding, photometry, catalog creation, and artificial st
Externí odkaz:
http://arxiv.org/abs/2402.03504
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