1,843 research outputs found
Large scale structure around a z=2.1 cluster
The most prodigious starburst galaxies are absent in massive galaxy clusters
today, but their connection with large scale environments is less clear at
. We present a search of large scale structure around a galaxy
cluster core at using a set of spectroscopically confirmed galaxies.
We find that both color-selected star-forming galaxies (SFGs) and dusty
star-forming galaxies (DSFGs) show significant overdensities around the
cluster. A total of 8 DSFGs (including 3 X-ray luminous active
galactic nuclei, AGNs) and 34 SFGs are found within a 10 arcmin radius
(corresponds to 15 cMpc at ) from the cluster center and within
a redshift range of , which leads to galaxy overdensities of
and . The cluster core and
the extended DSFG- and SFG-rich structure together demonstrate an active
cluster formation phase, in which the cluster is accreting a significant amount
of material from large scale structure while the more mature core may begin to
virialize. Our finding of this DSFG-rich structure, along with a number of
other protoclusters with excess DSFGs and AGNs found to date, suggest that the
overdensities of these rare sources indeed trace significant mass
overdensities. However, it remains puzzling how these intense star formers are
triggered concurrently. Although an increased probability of galaxy
interactions and/or enhanced gas supply can trigger the excess of DSFGs, our
stacking analysis based on 850 m images and morphological analysis based
on rest-frame optical imaging do not show such enhancements of merger fraction
and gas content in this structure.Comment: 11 pages, 4 figures, ApJ accepte
Nanomechanical-resonator-assisted induced transparency in a Cooper-pair-box system
We propose a scheme to demonstrate the electromagnetically induced
transparency (EIT) in a system of a superconducting Cooper-pair box coupled to
a nanomechanical resonator. In this scheme, the nanomechanical resonator plays
an important role to contribute additional auxiliary energy levels to the
Cooper-pair box so that the EIT phenomenon could be realized in such a system.
We call it here resonator-assisted induced transparency (RAIT). This RAIT
technique provides a detection scheme in a real experiment to measure physical
properties, such as the vibration frequency and the decay rate, of the coupled
nanomechanical resonator.Comment: To appear in New Journal of Physics: Special Issue "Mechanical
Systems at the Quantum Limit
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