scholarly journals Anisotropies of the infrared background and primordial galaxies

2006 ◽  
Vol 2 (14) ◽  
pp. 266-266
Author(s):  
Asantha R. Cooray
Keyword(s):  
Galaxy Formation ◽  
Near Infrared ◽  
Imaging Data ◽  
Near Ir ◽  
Infrared Background ◽  
Cosmic Infrared Background ◽  
Galactic Background

AbstractWe discuss anisotropies in the near-IR background between 1 to a few microns. This background is expected to contain a signature of primordial galaxies. We have measured fluctuations of resolved galaxies with Spitzer imaging data and we are developing a rocket-borne instrument (the Cosmic Infrared Background ExpeRiment, or CIBER) to search for signatures of primordial galaxy formation in the cosmic near-infrared extra-galactic background.

scholarly journals LOW-RESOLUTION NEAR-INFRARED STELLAR SPECTRA OBSERVED BY THE COSMIC INFRARED BACKGROUND EXPERIMENT (CIBER)

2017 ◽  
Vol 153 (2) ◽  
pp. 84 ◽  
Author(s):  
Min Gyu Kim ◽  
Hyung Mok Lee ◽  
Toshiaki Arai ◽  
James Bock ◽  
Asantha Cooray ◽  
...  
Keyword(s):  
Near Infrared ◽  
Low Resolution ◽  
Stellar Spectra ◽  
Infrared Background ◽  
Cosmic Infrared Background

scholarly journals Red supergiant stars in NGC 4449, NGC 5055, and NGC 5457

2016 ◽  
Vol 12 (S329) ◽  
pp. 392-392
Author(s):  
Sang-Hyun Chun ◽  
Yong-Jong Sohn ◽  
Martin Asplund ◽  
Luca Casagrande
Keyword(s):  
Galaxy Formation ◽  
Near Infrared ◽  
Massive Stars ◽  
H Ii Regions ◽  
Imaging Data ◽  
Spatially Correlated ◽  
Galaxy Formation And Evolution ◽  
Colour Distribution ◽  
Red Supergiants ◽  
Nearby Galaxies

AbstractNearby galaxies are ideal objects for the study of the mechanisms of galaxy formation and evolution, and massive stars in nearby galaxies are useful sources to investigate the structures and formation of the galaxies. It is important to gather the contents of massive stars for a number of galaxies spanning various metallicities. We focus on the red supergiants (RSGs) in nearby galaxies NGC 4449, NGC 5055, and NGC 5457, and the photometric properties of RSGs of three galaxies were investigated using near-infrared (JHK) imaging data obtained from WFCAM UKIRT. The (J − K, K)0 CMDs are investigated and compared with theoretical isochrones (Figure 1). The majority of RSGs in three galaxies have common age ranges from log(tyr) = 6.9 to log(tyr) = 7.3, and this indicates that these galaxies have experienced recent star formation within 20 Myr. Spatial correlation of RSGs with H II regions and their colour distribution were also investigated. For NGC 4449 and NGC 5457, the RSGs are spatially correlated with the H II regions, which however is not the case for NGC 5055. We found a similar colour distribution and a constant peak magnitude of MK = −11.9 for the RSGs in the three galaxies.

Detection of Small-Scale Fluctuations in the Near-Infrared Cosmic Infrared Background from Long-Exposure 2MASS Fields

2002 ◽  
Vol 579 (2) ◽  
pp. L53-L57 ◽  
Author(s):  
A. Kashlinsky ◽  
S. Odenwald ◽  
J. Mather ◽  
M. F. Skrutskie ◽  
R. M. Cutri
Keyword(s):  
Near Infrared ◽  
Small Scale ◽  
Infrared Background ◽  
Cosmic Infrared Background

Detecting Population III Stars through Observations of Near‐Infrared Cosmic Infrared Background Anisotropies

2004 ◽  
Vol 608 (1) ◽  
pp. 1-9 ◽  
Author(s):  
A. Kashlinsky ◽  
R. Arendt ◽  
Jonathan P. Gardner ◽  
John C. Mather ◽  
S. Harvey Moseley
Keyword(s):  
Near Infrared ◽  
Infrared Background ◽  
Cosmic Infrared Background ◽  
Population Iii Stars ◽  
Population Iii

Plasmon-assisted interaction of Si with light, for cancer hyperthermia and electromagnetic energy harvest

2020 ◽  
Vol 92 (2) ◽  
pp. 20101
Author(s):  
Behnam Kheyraddini Mousavi ◽  
Morteza Rezaei Talarposhti ◽  
Farshid Karbassian ◽  
Arash Kheyraddini Mousavi
Keyword(s):  
Silicon Nanowires ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Transition ◽  
Electromagnetic Energy ◽  
Energy Harvest ◽  
Absorption Enhancement ◽  
Ir Absorption ◽  
Absorption Mechanism ◽  
Near Ir

Metal-assisted chemical etching (MACE) is applied for fabrication of silicon nanowires (SiNWs). We have shown the effect of amorphous sheath of SiNWs by treating the nanowires with SF6 and the resulting reduction of absorption bandwidth, i.e. making SiNWs semi-transparent in near-infrared (IR). For the first time, by treating the fabricated SiNWs with copper containing HF∕H2O2∕H2O solution, we have generated crystalline nanowires with broader light absorption spectrum, up to λ = 1 μm. Both the absorption and photo-luminescence (PL) of the SiNWs are observed from visible to IR wavelengths. It is found that the SiNWs have PL at visible and near Infrared wavelengths, which may infer presence of mechanisms such as forbidden gap transitions other can involvement of plasmonic resonances. Non-radiative recombination of excitons is one of the reasons behind absorption of SiNWs. Also, on the dielectric metal interface, the absorption mechanism can be due to plasmonic dissipation or plasmon-assisted generation of excitons in the indirect band-gap material. Comparison between nanowires with and without metallic nanoparticles has revealed the effect of nanoparticles on absorption enhancement. The broader near IR absorption, paves the way for applications like hyperthermia of cancer while the optical transition in near IR also facilitates harvesting electromagnetic energy at a broad spectrum from visible to IR.

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