نتایج جستجو برای: galaxies individual andromeda i
تعداد نتایج: 1476211 فیلتر نتایج به سال:
The dwarf satellite galaxies in the Local Group are generally considered to be hosted in dark matter subhalos that survived the disruptive processes during infall onto their host halos. It has recently been argued that if the majority of satellites entered the Milky Way halo in a group rather than individually, this could explain the spatial and dynamical peculiarities of its satellite distribu...
New data on the membership of the Local Group, in conjunction with new and improved radial velocity data, are used to refine the derivation of the motion of the Sun relative to the Local Group (hereafter LG). The Sun is found to be moving with a velocity of V = 306 ± 18 km s−1 towards an apex at ` = 99◦ ± 5◦ and b = −4◦ ± 4◦. This agrees very well with previous analyses, but we discuss the poss...
The Andromeda Galaxy (M31) is the closest large galaxy to the Milky Way, thus it is an important laboratory for studying massive dark objects in galactic halos (MACHOs) by gravitational microlensing. Such studies strongly complement the studies of the Milky Way halo using the the Large and Small Magellanic Clouds. We consider the possibilities for microlensing surveys of M31 using the next gene...
I present the preliminary results of a program to measure the star formation history in the halo of the Andromeda galaxy. Using the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope, we obtained the deepest optical images of the sky to date, in a field on the southeast minor axis of Andromeda, 51′ (11 kpc) from the nucleus. The resulting color-magnitude diagram (CMD) contains appr...
We present first results from a spectroscopic survey designed to examine the metallicity and kinematics of individual red giant branch stars in the outer halo of the Andromeda spiral galaxy (M31). This study is based on multislit spectroscopy with the Keck II 10-m telescope and Low Resolution Imaging Spectrograph of the Ca ii near-infrared triplet in 99 M31 halo candidates in a field at R = 19 ...
We present new quasars discovered in the vicinity of the Andromeda and Triangulum galaxies with the LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope, also named Guoshoujing Telescope) during the 2010 and 2011 observational seasons. Quasar candidates are selected based on the available Sloan Digital Sky Survey (SDSS), Kitt Peak National Observatory (KPNO) 4 m telescope, Xuyi Sch...
We use density estimation likelihood-free inference, $\mathrm{\ensuremath{\Lambda}}$ cold dark matter simulations of $\ensuremath{\sim}2M$ galaxy pairs, and data from Gaia the Hubble Space Telescope to infer sum masses Milky Way Andromeda (M31) galaxies, two main components local group. This method overcomes most approximations traditional timing argument, makes writing a theoretical likelihood...
The failure of standard cosmolocical models in accounting for the statistics of dwarf satellites and the rotation curve of gas-rich dwarf galaxies in detail has led us to examine whether earlier non-equilibrium models of dwarf spheroidal satellites without any dark matter should be reconsidered in more detail. Such models can explain the high dispersion of the dwarf spheroids by the projection ...
We present new VLA C-configuration H i imaging of the Lyα-emitting starburst galaxies Tol 1924−416 and IRAS08339+6517. The effective resolution probes neutral gas structures larger than 4.7 kpc in Tol 1924−416, and larger than 8.1 kpc in IRAS08339+6517. Both systems are revealed to be tidally interacting: Tol 1924−416 with ESO338−IG04B (6.6 = 72 kpc minimum separation), and IRAS08339+6517 with ...
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