scholarly journals Optical and Near‐Infrared Structural Properties of Cluster Galaxies atz∼ 0.3

2002 ◽  
Vol 571 (2) ◽  
pp. 790-808 ◽  
Author(s):  
F. La Barbera ◽  
G. Busarello ◽  
P. Merluzzi ◽  
M. Massarotti ◽  
M. Capaccioli
Keyword(s):  
Structural Properties ◽  
Near Infrared ◽  
Cluster Galaxies

scholarly journals An environmental dependence of the physical and structural properties in the Hydra cluster galaxies

2020 ◽  
Vol 500 (1) ◽  
pp. 1323-1339
Author(s):  
Ciria Lima-Dias ◽  
Antonela Monachesi ◽  
Sergio Torres-Flores ◽  
Arianna Cortesi ◽  
Daniel Hernández-Lang ◽  
...  
Keyword(s):  
Structural Properties ◽  
Clustering Algorithm ◽  
Spatial Clustering ◽  
Broad Band ◽  
Visible Region ◽  
Early Type ◽  
Cluster Galaxies ◽  
Using Data ◽  
Stellar Masses ◽  
Environmental Dependence

ABSTRACT The nearby Hydra cluster (∼50 Mpc) is an ideal laboratory to understand, in detail, the influence of the environment on the morphology and quenching of galaxies in dense environments. We study the Hydra cluster galaxies in the inner regions (1R200) of the cluster using data from the Southern Photometric Local Universe Survey, which uses 12 narrow and broad-band filters in the visible region of the spectrum. We analyse structural (Sérsic index, effective radius) and physical (colours, stellar masses, and star formation rates) properties. Based on this analysis, we find that ∼88 per cent of the Hydra cluster galaxies are quenched. Using the Dressler–Schectman test approach, we also find that the cluster shows possible substructures. Our analysis of the phase-space diagram together with density-based spatial clustering algorithm indicates that Hydra shows an additional substructure that appears to be in front of the cluster centre, which is still falling into it. Our results, thus, suggest that the Hydra cluster might not be relaxed. We analyse the median Sérsic index as a function of wavelength and find that for red [(u − r) ≥2.3] and early-type galaxies it displays a slight increase towards redder filters (13 and 18 per cent, for red and early type, respectively), whereas for blue + green [(u − r)<2.3] galaxies it remains constant. Late-type galaxies show a small decrease of the median Sérsic index towards redder filters. Also, the Sérsic index of galaxies, and thus their structural properties, do not significantly vary as a function of clustercentric distance and density within the cluster; and this is the case regardless of the filter.

scholarly journals Stellar population study in early-type galaxies: an approach from the K band

2009 ◽  
Vol 5 (S262) ◽  
pp. 85-88
Author(s):  
Esther Mármol-Queraltó ◽  
Nicolás Cardiel ◽  
P. Sánchez-Blázquez ◽  
S. C. Trager ◽  
R. F. Peletier ◽  
...  
Keyword(s):  
Stellar Population ◽  
Near Infrared ◽  
Optical Measurements ◽  
Early Type ◽  
Spectral Window ◽  
Cluster Galaxies ◽  
Medium Resolution ◽  
Fornax Cluster ◽  
New Generation ◽  
K Band

AbstractA full understanding of the physical properties of integrated stellar systems demands a multiwavelength approach since each spectral window shows us the contribution of different types of stars. However, most of the observational effort in stellar population studies has been focused on the optical range. Now, the new generation of instruments allow us to explore the K band, where RGB and AGB stars dominate the light of the integrated spectra. Here we present a K-band spectroscopic analysis of early-type galaxies in different environments. Our sample comprises 12 field early-type galaxies observed with ISAAC at VLT with medium resolution, and they are compared with 11 Fornax cluster galaxies previously reported by Silva et al. (2008). The clear differences found in the infrared DCO and NaI indices between field and Fornax galaxies are discussed, trying to solve the puzzle formed by the near-infrared and optical measurements.

Photoluminescence and Structural Properties of Si Nanoparticles Embedded in SiO2 Matrix by Reactive RF Magnetron Sputtering

2007 ◽  
Vol 336-338 ◽  
pp. 2074-2076
Author(s):  
K. Ma ◽  
Jia You Feng
Keyword(s):  
Magnetron Sputtering ◽  
Structural Properties ◽  
Near Infrared ◽  
Silicon Oxide ◽  
Rf Magnetron Sputtering ◽  
Sio2 Matrix ◽  
Si Nanoparticles ◽  
Oxide Matrix ◽  
Reactive Rf Magnetron Sputtering ◽  
Deposited Films

In the present work, we investigate the photoluminescence (PL) and structural properties of Si nanoparticles embedded in SiO2 matrix. Si-rich silicon oxide (SRSO) films with Si concentration of 39% were synthesized by reactive RF magnetron sputtering. Annealing was performed at temperatures between 600°C and 1100°C in N2 ambient for 2h to precipitate Si nanoparticles from oxide matrix. Near infrared photoluminescence around 750nm can be clearly observed even in the as-deposited films, which indicates the existence of Si nanoparticles in films. The structural properties were analyzed by infrared absorption and Raman spectra. It is found that the structural properties strongly affect the PL properties of Si nanoparticles embedded in SiO2 matrix.

scholarly journals KMOS Clusters and VIRIAL GTO Surveys

2014 ◽  
Vol 10 (S309) ◽  
pp. 293-294
Author(s):  
D. Wilman ◽  
R. Bender ◽  
R. L. Davies ◽  
J. T. Mendel ◽  
J. Chan ◽  
...  
Keyword(s):  
Near Infrared ◽  
Early Type ◽  
Dynamical Mass ◽  
Fundamental Plane ◽  
Cluster Galaxies ◽  
Medium Resolution ◽  
Stellar Velocity ◽  
Time Observation ◽  
Field Unit ◽  
First Time

AbstractWe present the KMOS (K-band Multi-Object Spectrograph) Cluster and VIRIAL (VLT IRIFU Absorption Line) Guaranteed Time Observation (GTO) programs. KMOS provides 24 arms each feeding an integral field unit (14×14 spaxels of 0.2″ pixels) for IZ, YJ, H and K band near infrared (NIR) medium resolution spectroscopy (R ∼ 3500). Targets are selected from a 7.2′ diameter patrol field. Ultra-deep spectroscopy of ∼ 80 early-type cluster galaxies (∼ 20hr on source) and ∼ 200 (∼ 10hr on source) early-type field galaxies at 1 < z < 2 will dramatically improve the situation at z > 1 for which measurements of stellar velocity dispersions and absorption indices are limited to a few, often relatively young passively evolving galaxies (e.g. Bezanson 2013). In ESO Periods P92 and P93, 15 nights worth of data has been collected for KMOS-Clusters and 6 nights for VIRIAL: this will be supplemented with more data in upcoming semesters. All galaxies have multiband HST imaging including existing or upcoming WFC3 IR imaging, providing stellar mass maps and sizes. Combined with our dispersion measurements, this will allow us to examine the fundamental plane and the dynamical mass of a large sample of z > 1 galaxies for the first time, for both cluster and field galaxies.

scholarly journals Evolution of UV–NIR structural properties of cluster galaxies

2003 ◽  
Vol 409 (1) ◽  
pp. 21-35 ◽  
Author(s):  
F. La Barbera ◽  
G. Busarello ◽  
M. Massarotti ◽  
P. Merluzzi ◽  
A. Mercurio
Keyword(s):  
Structural Properties ◽  
Cluster Galaxies

Near Infrared Imaging of Late Type Virgo Cluster Galaxies

1996 ◽  
pp. 210-213
Author(s):  
Alessandro Boselli ◽  
Giuseppe Gavazzi ◽  
Hans Hippelein ◽  
James Lequeux ◽  
Daniele Pierini ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Virgo Cluster ◽  
Late Type ◽  
Near Infrared Imaging ◽  
Cluster Galaxies

scholarly journals Structural properties, Judd–Ofelt calculations, and near infrared to visible photon up-conversion in Er3+/Yb3+ doped BaTiO3 phosphors under excitation at 1500 nm

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10529-10538 ◽  
Author(s):  
M. Vega ◽  
P. Alemany ◽  
I. R. Martin ◽  
J. Llanos
Keyword(s):  
Structural Properties ◽  
Near Infrared ◽  
Visible Photon

The structural and up-conversion properties of BaTiO3 phosphors doped with Er3+/Yb3+ have been studied.

scholarly journals How Special Are Brightest Cluster Galaxies? The Impact of Near-Infrared Luminosities on Scaling Relations for BCGs

2007 ◽  
Vol 663 (2) ◽  
pp. L85-L88 ◽  
Author(s):  
Dan Batcheldor ◽  
Alessandro Marconi ◽  
David Merritt ◽  
David J. Axon
Keyword(s):  
Near Infrared ◽  
Scaling Relations ◽  
Cluster Galaxies ◽  
Brightest Cluster Galaxies ◽  
The Impact
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