We present the results of deep near-infrared observations (with ISAAC at VLT) of eleven hard X-ray selected sources in the Hellas2XMM survey, with faint optical magnitude (R> ∼ 24) and high X-ray-to-optical flux ratio. All but one of the sources have been detected in the Ks band, with bright counterparts (Ks<19) and very red colors (R−K > 5), therefore belonging to the ERO population. Thanks to...

We present the fabrication and characterization of an artificial crystal structure formed from a thin film of silicon that has a full phononic band gap for microwave X-band phonons and a two-dimensional pseudo-band gap for near-infrared photons. An engineered defect in the crystal structure is used to localize optical and mechanical resonances in the band gap of the planar crystal. Two-tone opt...

We present optical and near-infrared photometry of 45 clusters of galaxies at 0.1 < z < 1.3. Galaxy catalogs in each cluster were defined at the longest wavelenth available, generally the K-band, down to approximately two magnitudes below M∗. We include finding chart images of the band used for catalog definition. The photometry has been used in previously published papers to examine the origin...

Two Pt-H vibrational bands at 1679 cm(-1) and 1392 cm(-1) observed with 13-atom Pt clusters supported in LTL zeolite by Fourier Transform Infrared (FTIR) spectroscopy confirms that H atoms bridge two Pt atoms across the edges of the metal cluster. An additional broad absorption band centred near 2200 cm(-1) which exhibits some substructure is assigned to low energy electronic excitations across...

We have directly imaged the spatial modes inside a one-dimensional photonic band gap device using near-field scanning optical microscopy. Our results show large scattering at the transition between waveguide modes and lattice modes, as well as increased scattering for wavelengths within the stop band. Additionally, we present preliminary results on infrared imaging of the localized mode of a de...

We present optical and near-infrared photometry of 45 clusters of galaxies at 0.1 < z < 1.3. Galaxy catalogs in each cluster were defined at the longest wavelenth available, generally the K-band, down to approximately two magnitudes below M∗. We include finding chart images of the band used for catalog definition. The photometry has been used in previously published papers to examine the origin...

We have carried out a simultaneous, multi-band (J , H, K) survey over an area of 1320 arcmin in the L1630 region, concentrating on the region away from the dense molecular cores and with modest visual extinctions (≤ 10 mag). Previous studies found that star formation in L1630 occurs mainly in four localized clusters, which in turn are associated with the four most massive molecular cores (Lada ...

in present study we studied using green routes for microwave assisted synthesis of alumina nanoparticles from aluminum nitrate. it was revealed that when plant extracts are used, no specific stabilizer is needed. structural characterization of nanoparticles was studied using x-ray diffraction that showed semi-crystalline structure for two of plant extracts, other xrd patterns had no significant...

Introduction: Minerals have a variety of absorption features in the visible, near-infrared, and midinfrared wavelength regions [1,2]. Except for a few spectral studies in the mid-infrared such as the one done by Lim et al. [3], most asteroids have been only observed in the visible and near-infrared spectral regions due to the difficulty in obtaining reflectance spectra at longer wavelengths. Th...

We report the results of a spectroscopic search for debris disks surrounding 41 nearby solar type stars, including 8 planet-bearing stars, using the Spitzer Space Telescope. With accurate relative photometry using the Infrared Spectrometer (IRS) between 7-34 µm we are able to look for excesses as small as ∼2% of photospheric levels with particular sensitivity to weak spectral features. For star...