Zobrazeno 1 - 10
of 163
pro vyhledávání: '"Hammer, François"'
Autor:
Smith, Simon E. T., Cerny, William, Hayes, Christian R., Sestito, Federico, Jensen, Jaclyn, McConnachie, Alan W., Geha, Marla, Navarro, Julio, Li, Ting S., Cuillandre, Jean-Charles, Errani, Raphaël, Chambers, Ken, Gwyn, Stephen, Hammer, Francois, Hudson, Michael J., Magnier, Eugene, Martin, Nicolas
We present the discovery of Ursa Major III/UNIONS 1, the least luminous known satellite of the Milky Way, which is estimated to have an absolute V-band magnitude of $+2.2^{+0.4}_{-0.3}$ mag, equivalent to a total stellar mass of 16$^{+6}_{-5}$ M$_{\o
Externí odkaz:
http://arxiv.org/abs/2311.10147
Autor:
Wang, Jianling, Hammer, Francois, Yang, Yanbin, Pawlowski, Marcel S., Mamon, Gary A., Wang, Haifeng
Most Milky Way dwarf galaxies are much less bound to their host than are relics of Gaia-Sausage-Enceladus and Sgr. These dwarfs are expected to have fallen into the Galactic halo less than 3 Gyr ago, and will therefore have undergone no more than one
Externí odkaz:
http://arxiv.org/abs/2311.05687
Autor:
Hammer, Francois, Wang, Jianling, Mamon, Gary A., Pawlowski, Marcel S., Yang, Yanbin, Jiao, Yongjun, Li, Hefan, Bonifacio, Piercarlo, Caffau, Elisabetta, Wang, Haifeng
We study how structural properties of globular clusters and dwarf galaxies are linked to their orbits in the Milky Way halo. From the inner to the outer halo, orbital energy increases and stellar-systems gradually move out of internal equilibrium: in
Externí odkaz:
http://arxiv.org/abs/2311.05677
Autor:
Jiao, Yongjun, Hammer, Francois, Wang, Haifeng, Wang, Jianling, Amram, Philippe, Chemin, Laurent, Yang, Yanbin
Publikováno v:
A&A 678, A208 (2023)
Our position inside the Galactic disc had prevented us from establishing an accurate rotation curve, until the advent of Gaia, whose third data release (Gaia DR3) made it possible to specify it up to twice the optical radius. We aim to establish a ne
Externí odkaz:
http://arxiv.org/abs/2309.00048
We use the rotation curve from Gaia data release (DR) 3 to estimate the mass of the Milky Way. We consider an Einasto density profile to model the dark matter component. We extrapolate and obtain a dynamical mass $M=2.75^{+3.11}_{-0.48}\times 10^{11}
Externí odkaz:
http://arxiv.org/abs/2306.05461
The Magellanic Stream is unique to sample the MW potential from ~50 kpc to 300 kpc, and is also unique in constraining the LMC mass, an increasingly important question for the Local Group/Milky Way modeling. Here we compare strengths and weaknesses o
Externí odkaz:
http://arxiv.org/abs/2306.03944
Autor:
Bhattacharya, Souradeep, Arnaboldi, Magda, Gerhard, Ortwin, Caldwell, Nelson, Kobayashi, Chiaki, Hammer, Francois, Yang, Yanbin, Freeman, Kenneth C., Hartke, Johanna, McConnachie, Alan
Publikováno v:
Proceedings of the International Astronomical Union , Volume 18 , Symposium S377: Early Disk-Galaxy Formation from JWST to the Milky Way , December 2022 , pp. 123 - 126
The Andromeda galaxy (M 31) has experienced a tumultuous merger history as evidenced by the many substructures present in its inner halo. We use planetary nebulae (PNe) as chemodynamic tracers to shed light on the recent merger history of M 31. We id
Externí odkaz:
http://arxiv.org/abs/2305.02761
Autor:
Bhattacharya, Souradeep, Arnaboldi, Magda, Hammer, Francois, Yang, Yanbin, Gerhard, Ortwin, Caldwell, Nelson, Freeman, Kenneth C.
M31 has experienced a recent tumultuous merger history as evidenced from the many substructures that are still present in its inner halo, particularly the G1-Clump, NE- and W- shelves, and the Giant Stream (GS). We present planetary nebulae (PNe) lin
Externí odkaz:
http://arxiv.org/abs/2304.14151
Autor:
Hammer, Francois, Li, Hefan, Mamon, Gary A., Pawlowski, Marcel S., Bonifacio, Piercarlo, Jiao, Yongjun, Wang, Haifeng, Wang, Jianling, Yang, Yanbin
Halo inhabitants are individual stars, stellar streams, star and globular clusters, and dwarf galaxies. Here we compare the two last categories that include objects of similar stellar mass, which are often studied as self-dynamical equilibrium system
Externí odkaz:
http://arxiv.org/abs/2212.07441
Autor:
Smith, Simon E. T., Jensen, Jaclyn, Roediger, Joel, Sestito, Federico, Hayes, Christian R., McConnachie, Alan W., Cuillandre, Jean-Charles, Gwyn, Stephen, Magnier, Eugene, Chambers, Ken, Hammer, Francois, Hudson, Mike, Martin, Nicolas, Navarro, Julio, Scott, Douglas
We present the discovery of Bo\"otes V, a new ultra-faint dwarf galaxy candidate. This satellite is detected as a resolved overdensity of stars during an ongoing search for new Local Group dwarf galaxy candidates in the UNIONS photometric dataset. It
Externí odkaz:
http://arxiv.org/abs/2209.08242