نتایج جستجو برای: z frame
تعداد نتایج: 247522 فیلتر نتایج به سال:
The past decade has seen impressive progress in the detection of $z>7$ galaxies with Hubble Space Telescope, however little is known about their properties. James Webb Telescope will revolutionise high-$z$ field by providing NIR (i.e., rest-frame optical) data unprecedented depth and spatial resolution. Measuring galaxy quantities such as resolved stellar ages or gas metallicity gradients tradi...
Upon its completion, the Herschel Astrophysics Terahertz Large Area Survey (H-ATLAS) will be the largest sub-millimetre survey to date, detecting close to half-a-million sources. It will only be possible to measure spectroscopic redshifts for a small fraction of these sources. However, if the rest-frame spectral energy distribution (SED) of a typical H-ATLAS source is known, this SED and the ob...
Recent Spitzer/InfraRed Array Camera (IRAC) photometric observations have revealed that rest-frame optical emission lines contribute significantly to the broad-band fluxes of highredshift galaxies. Specifically, in the narrow redshift range z ∼ 5.1–5.4 the [3.6]–[4.5] colour is expected to be very red, due to contamination of the 4.5 μm band by the dominant Hα line, while the 3.6μmfilter is fre...
We present near-IR photometry of a selected sample of southern hemisphere E+A galaxies. The sample includes 50 galaxies from nearby (z ∼ 0.05) and distant (z ∼ 0.3) clusters as well as E+A galaxies from the field (z ∼ 0.1). We also observed 13 normal early-type galaxies from the field and from clusters to be compared with the E+A sample. The photometry includes J , H and Ks apparent magnitudes ...
We use a sample of rest-frame UV-selected and spectroscopically observed galaxies at redshifts 1:9 z < 3:4, combined with ground-based spectroscopic H and Spitzer MIPS 24 m data, to derive the most robust measurements of the rest-frame UV, H , and infrared (IR) luminosity functions (LFs) at these redshifts. Our sample is by far the largest of its kind, with over 2000 spectroscopic redshifts in ...
We present the results of near-infrared spectroscopic observations for a sample of 12 star-forming galaxies at 1.0 < z < 1.5, drawn from the DEEP2 Galaxy Redshift Survey. Hβ, [OIII], Hα, and [NII] emission-line fluxes are measured for these galaxies. Application of the O3N2 and N2 strongline abundance indicators implies average gas-phase oxygen abundances of 50 − 80% solar. We find preliminary ...
We use a sample of rest-frame UV selected and spectroscopically observed galaxies at redshifts 1.9 ≤ z < 3.4, combined with ground-based spectroscopic Hα and Spitzer MIPS 24 μm data, to derive the most robust measurements of the rest-frame UV, Hα, and infrared (IR) luminosity functions (LFs) at these redshifts. Our sample is by far the largest of its kind, with over 2000 spectroscopic redshifts...
Abstract We propose a new cosmological framework in which the strength of gravitational force acted on dark matter at late time can be weaker than that standard fields without introducing extra degrees freedom. The integrates into type-II minimally modified gravity was recently proposed as energy mimicker. idea makes such possible consists coupling Lagrangian and constant to metric canonically ...
A high order particle-source-in-cell (PSIC) algorithm is presented for the computation of the interaction between shocks, small scale structures, and liquid and/or solid particles in high-speed engineering applications. The improved high order finite difference weighted essentially non-oscillatory (WENO-Z) method for solution of the hyperbolic conservation laws that govern the shocked carrier g...
The quality, depth, and multi–color nature of the Hubble Deep Field images makes them an excellent resource for studying galaxies at z > 2 using selection techniques based on the presence of the 912Å Lyman break. I present a descriptive review of this method and of the properties of the objects which it identifies, and summarize spectroscopic progress on galaxies with 2 < z < 4 in the HDF. Usin...
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