64 research outputs found
On the cosmic evolution of the scaling relations between black holes and their host galaxies: Broad Line AGN in the zCOSMOS survey
(Abriged) We report on the measurement of the rest frame K-band luminosity
and total stellar mass of the hosts of 89 broad line Active Galactic Nuclei
detected in the zCOSMOS survey in the redshift range 1<z<2.2. The unprecedented
multiwavelength coverage of the survey field allows us to disentangle the
emission of the host galaxy from that of the nuclear black hole in their
Spectral Energy Distributions. We derive an estimate of black hole masses
through the analysis of the broad Mg II emission lines observed in the
medium-resolution spectra taken with VIMOS/VLT as part of the zCOSMOS project.
We found that, as compared to the local value, the average black hole to host
galaxy mass ratio appears to evolve positively with redshift, with a best fit
evolution of the form (1+z)^{0.68 \pm0.12 +0.6 -0.3}, where the large
asymmetric systematic errors stem from the uncertainties in the choice of IMF,
in the calibration of the virial relation used to estimate BH masses and in the
mean QSO SED adopted. A thorough analysis of observational biases induced by
intrinsic scatter in the scaling relations reinforces the conclusion that an
evolution of the MBH-M* relation must ensue for actively growing black holes at
early times: either its overall normalization, or its intrinsic scatter (or
both) appear to increase with redshift. This can be interpreted as signature of
either a more rapid growth of supermassive black holes at high redshift, a
change of structural properties of AGN hosts at earlier times, or a significant
mismatch between the typical growth times of nuclear black holes and host
galaxies.Comment: 47 pages, 8 figures. Accepted for publication in Ap
Restriction in lateral bending range of motion, lumbar lordosis, and hamstring flexibility predicts the development of low back pain: a systematic review of prospective cohort studies
Effect of LiPF6 on the thermal behaviors of four organic solvents for lithium ion batteries
Performance of a full-size small-strip thin gap chamber prototype for the ATLAS new small wheel muon upgrade
The instantaneous luminosity of the Large Hadron Collider at CERN will be
increased up to a factor of five with respect to the present design value by
undergoing an extensive upgrade program over the coming decade. The most
important upgrade project for the ATLAS Muon System is the replacement of the
present first station in the forward regions with the so-called New Small
Wheels (NSWs). The NSWs will be installed during the LHC long shutdown in
2018/19. Small-Strip Thin Gap Chamber (sTGC) detectors are designed to provide
fast trigger and high precision muon tracking under the high luminosity LHC
conditions. To validate the design, a full-size prototype sTGC detector of
approximately 1.2 consisting of four gaps has
been constructed. Each gap provides pad, strip and wire readouts. The sTGC
intrinsic spatial resolution has been measured in a pion
beam test at Fermilab. At perpendicular incidence angle, single gap position
resolutions of about have been obtained, uniform along the
sTGC strip and perpendicular wire directions, well within design requirements.
Pad readout measurements have been performed in a muon
beam test at CERN. The transition region between readout pads has been found to
be , and the pads have been found to be fully efficient
Recommended from our members
Performance of a full-size small-strip thin gap chamber prototype for the ATLAS new small wheel muon upgrade
The instantaneous luminosity of the Large Hadron Collider at CERN will be
increased up to a factor of five with respect to the present design value by
undergoing an extensive upgrade program over the coming decade. The most
important upgrade project for the ATLAS Muon System is the replacement of the
present first station in the forward regions with the so-called New Small
Wheels (NSWs). The NSWs will be installed during the LHC long shutdown in
2018/19. Small-Strip Thin Gap Chamber (sTGC) detectors are designed to provide
fast trigger and high precision muon tracking under the high luminosity LHC
conditions. To validate the design, a full-size prototype sTGC detector of
approximately 1.2 consisting of four gaps has
been constructed. Each gap provides pad, strip and wire readouts. The sTGC
intrinsic spatial resolution has been measured in a pion
beam test at Fermilab. At perpendicular incidence angle, single gap position
resolutions of about have been obtained, uniform along the
sTGC strip and perpendicular wire directions, well within design requirements.
Pad readout measurements have been performed in a muon
beam test at CERN. The transition region between readout pads has been found to
be , and the pads have been found to be fully efficient
Electrophysiological investigation of auditory recruitment by averaged electroencephalographic-evoked response
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