1,843 research outputs found

    Large scale structure around a z=2.1 cluster

    Get PDF
    The most prodigious starburst galaxies are absent in massive galaxy clusters today, but their connection with large scale environments is less clear at z≳2z\gtrsim2. We present a search of large scale structure around a galaxy cluster core at z=2.095z=2.095 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 z=2.095z=2.095 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 ∼\sim15 cMpc at z∼2.1z\sim2.1) from the cluster center and within a redshift range of Δz=0.02\Delta z=0.02, which leads to galaxy overdensities of δDSFG∼12.3\delta_{\rm DSFG}\sim12.3 and δSFG∼2.8\delta_{\rm SFG}\sim2.8. 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 μ\mum 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

    Full text link
    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
    • …
    corecore