نتایج جستجو برای: red edge re
تعداد نتایج: 430936 فیلتر نتایج به سال:
In this paper we present deep VLT multi wavelength imaging observations of the field around the radio galaxy PKS 1138−262 aimed at detecting and studying a (potential) proto-cluster centered at this radio source. PKS 1138−262 is a massive galaxy at z = 2.16, located in a dense environment as indicated by optical, X-ray and radio observations. We had already found an over-density of Lyα emitting...
Extremely Red Objects (EROs) offer a window to the universe at z ∼ 1 analogous to that provided by the Lyman Break galaxies at z = 3. Passive evolution and hierarchical galaxy formation models make very distinct predictions for the K (2.2μm) surface density of galaxies at z ∼ 1 and EROs are a powerful constraint on these theories. I present a study of nine resolved EROs with R − K ≥ 5.3 and K ≤...
We have examined the occurrence of Extremely Red Objects (EROs) in the fields of 13 luminous quasars (11 radio-loud and two radio-quiet) at 1.8 < z < 3.0. The average surface density of Ks ≤ 19 mag EROs is two-three times higher than in large, random-field surveys, and the excess is significant at the ≈ 3σ level even after taking into account that the ERO distribution is highly inhomogeneous. T...
We report optical photometry and Hi synthesis observations of the southern edge-on S c,d galaxy IC 5249. The observations were carried out primarily to determine if IC 5249 has a red halo surrounding it similar to the halo that has recently been found surrounding the northern edge-on galaxy NGC 5907. The galaxy IC 5249 is almost perfectly edge-on, and it shows no direct sign of warping or flari...
Extremely Red Objects (EROs) offer a window to the universe at z ∼ 1 analogous to that provided by the Lyman Break galaxies at z = 3. Passive evolution and hierarchical galaxy formation models make very distinct predictions for the K (2.2μm) surface density of galaxies at z ∼ 1 and EROs are a powerful constraint on these theories. I present a study of nine resolved EROs with R − K ≥ 5.3 and K ≤...
In [6] we computed the edge Folkman number F (3, 4; 8) = 16. There we used and announced without proof that in any blue-red coloring of the edges of the graph K1 +C5 +C5 + C5 there is either a blue 3-clique or red 4-clique. In this paper we give a detailed proof of this fact.
Rhenium nanocrystalline particles (Re NPs), of 2 nm size, were prepared from NH4ReO4 under mild conditions in neat alcohol. The unsupported Re NPs convert secondary and benzylic alcohols to ketones and aldehydes, respectively, through catalytic acceptorless dehydrogenation (AD). The oxidant- and acceptor-free neat dehydrogenation of alcohols to obtain dihydrogen gas is a green and atom-economic...
In this paper, edge crack problems under mechanical loads have been analysed using extended finite element method (XFEM) as it has proved to be a competent method for handling problems with discontinuities. The XFEM provides a versatile technique to model discontinuities in the solution domain without re-meshing or conformal mesh. The stress intensity factors (SIF) have been calculated by domai...
For variable annuities, the cost of hedging must be taken into consideration when firms use the dynamic hedging strategy. In this paper, we study hedging strategies by assuming the hedge position follows a random walk with boundary conditions. We find that re-balancing delta to the initial position is always more cost-efficient than re-balancing it to the edge for a fixed transaction cost. Howe...
We report optical photometry and Hi synthesis observations of the southern edge-on S c,d galaxy IC 5249. The observations were carried out primarily to determine if IC 5249 has a red halo surrounding it similar to the halo that has recently been found surrounding the northern edge-on galaxy NGC 5907. The galaxy IC 5249 is almost perfectly edge-on, and it shows no direct sign of warping or flari...
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