Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Vargas, Luis C."'
Autor:
Gennaro, Mario, Tchernyshyov, Kirill, Brown, Thomas M., Geha, Marla, Avila, Roberto J., Guhathakurta, Puragra, Kalirai, Jason S., Kirby, Evan N., Renzini, Alvio, Simon, Joshua D., Tumlinson, Jason, Vargas, Luis C.
Using deep HST/ACS observations, we demonstrate that the sub-solar stellar initial mass function (IMF) of 6 ultra-faint dwarf Milky Way Satellites (UFDs) is more bottom light than the IMF of the Milky Way disk. Our data have a lower mass limit of abo
Externí odkaz:
http://arxiv.org/abs/1801.06195
Autor:
Vargas, Luis C., Gilbert, Karoline M., Geha, Marla C., Tollerud, Erik J., Kirby, Evan N., Guhathakurta, Puragra
We present alpha element to iron abundance ratios, [$\alpha$/Fe], for four stars in the outer stellar halo of the Andromeda Galaxy (M 31). The stars were identified as high-likelihood field halo stars by Gilbert et al. (2012) and lie at projected dis
Externí odkaz:
http://arxiv.org/abs/1410.3475
Autor:
Brown, Thomas M., Tumlinson, Jason, Geha, Marla, Simon, Joshua D., Vargas, Luis C., VandenBerg, Don A., Kirby, Evan N., Kalirai, Jason S., Avila, Roberto J., Gennaro, Mario, Ferguson, Henry C., Munoz, Ricardo R., Guhathakurta, Puragra, Renzini, Alvio
We present new constraints on the star formation histories of six ultra-faint dwarf galaxies: Bootes I, Canes Venatici II, Coma Berenices, Hercules, Leo IV, and Ursa Major I. Our analysis employs a combination of high-precision photometry obtained wi
Externí odkaz:
http://arxiv.org/abs/1410.0681
We present alpha to iron abundance ratios for 226 individual red giant branch stars in nine dwarf galaxies of the Andromeda (M 31) satellite system. The abundances are measured from the combined signal of Mg, Si, Ca, and Ti lines in Keck/DEIMOS mediu
Externí odkaz:
http://arxiv.org/abs/1406.0510
Autor:
Brown, Thomas M., Tumlinson, Jason, Geha, Marla, Kirby, Evan, VandenBerg, Don A., Kalirai, Jason S., Simon, Joshua D., Avila, Roberto J., Munoz, Ricardo R., Guhathakurta, Puragra, Renzini, Alvio, Ferguson, Henry C., Vargas, Luis C., Gennaro, Mario
We present early results from a Hubble Space Telescope survey of the ultra-faint dwarf galaxies. These Milky Way satellites were discovered in the Sloan Digital Sky Survey, and appear to be an extension of the classical dwarf spheroidals to low lumin
Externí odkaz:
http://arxiv.org/abs/1310.0824
The Milky Way ultra-faint dwarf galaxies (UFDs) contain some of the oldest, most metal-poor stars in the Universe. We present [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], and mean [alpha/Fe], abundance ratios for 61 individual red giant branch stars across 8
Externí odkaz:
http://arxiv.org/abs/1302.6594
We present Keck/DEIMOS spectroscopy of resolved stars in the M31 satellites And XXVIII & And XXIX. We show that these are likely self-bound galaxies based on 18 and 24 members in And XXVIII & And XXIX, respectively. And XXVIII has a systemic velocity
Externí odkaz:
http://arxiv.org/abs/1302.0848
Autor:
Fadely, Ross, Willman, Beth, Geha, Marla, Walsh, Shane, Munoz, Ricardo R., Jerjen, Helmut, Vargas, Luis C., Da Costa, Gary S.
We investigate the kinematic and photometric properties of the Segue 3 Milky Way companion using Keck/DEIMOS spectroscopy and Magellan/IMACS g and r-band imaging. Using maximum likelihood methods to analyze the photometry, we study the structure and
Externí odkaz:
http://arxiv.org/abs/1107.3151
Autor:
Gennaro, Mario, Tchemyshyov, Kirill, Brown, Thomas M., Geha, Marla, Avila, Roberto J., Guhathakurta, Puragra, Kalirai, Jason S., Kirby, Evan N., Renzini, Alvio, Simon, Joshua D., Tumlinson, Jason, Vargas, Luis C.
Using deep observations obtained with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST), we demonstrate that the sub-solar stellar initial mass function (IMF) of six ultra-faint dwarf Milky Way satellites (UFDs) is more
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od________38::dfb1236a1eb9acbdbc6ffdd21c038c91
https://resolver.caltech.edu/CaltechAUTHORS:20180228-094019082
https://resolver.caltech.edu/CaltechAUTHORS:20180228-094019082
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