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Gemini Tracks Distant Star Cluster with Adaptive Optics
Gemini Distant Star Cluster Adaptive Optics
2017/7/20
We present a proper motion measurement for the halo globular cluster Pyxis, using HST/ACS data as the first epoch, and GeMS/GSAOI Adaptive Optics data as the second, separated by a baseline of ～ 5 yea...
ALMA Weighs Supermassive Black Hole at Center of Distant Spiral Galaxy（图）
ALMA Weighs Supermassive Black Hole Distant Spiral Galaxy
2015/7/13
Supermassive black holes lurk at the center of every large galaxy. These cosmic behemoths can be millions to billions of times more massive than the Sun. Determining just how massive, however, has bee...
Discovery of tidal tails around the distant globular cluster Palomar 14
tidal tails the distant globular cluster Palomar 14
2011/1/13
We report the detection of a pair of degree-long tidal tails associated with the globular cluster Palomar 14, using images obtained at the CFHT. We reveal a power-law departure from a King profile at...
Simultaneous Falsification of LCDM and Quintessence with Massive, Distant Clusters
Falsification of LCDM Quintessence with Massive Distant Clusters
2010/11/9
Observation of even a single massive cluster, especially at high redshift, can falsify the standard cosmological framework consisting of a cosmological constant and cold dark matter (CDM) with Gaussi...
Gas accretion as the origin of chemical abundance gradients in distant galaxies
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/29
It has recently been suggested that galaxies in the early Universe can grow through the accretion of cold gas, and that this may have been the main driver of star formation and stellar mass growth.
ZEUS-2: a second generation submillimeter grating spectrometer for exploring distant galaxies
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2010/12/27
ZEUS-2, the second generation (z)Redshift and Early Universe Spectrometer, like its predecessor is a moderate resolution (R~1000) long-slit, echelle grating spectrometer optimized for the detection of...