نتایج جستجو برای: herschel
تعداد نتایج: 1975 فیلتر نتایج به سال:
We are interested in the derivation of an integrated Herschel-Bulkley model for shallow flows, as well as in the design of a numerical algorithm to solve the resulting equations. The goal is to simulate the evolution of thin sheet of viscoplastic materials on inclined planes and, in particular, to be able to compute the evolution from dynamic to stationary states. The model involves a variation...
Yielding transitions in athermal amorphous materials undergoing steady-state shear flow resemble critical phenomena. Historically, they have been described by the Herschel-Bulkley rheological formula, which implies singular behaviors at yield points. In this paper, I examine this class of phenomena using an elementary version of the thermodynamic shear-transformation-zone (STZ) theory, focusing...
Aims. Instrument simulators are becoming ever more useful for planning and analysing large astronomy survey data. In this paper we present a simulator for the Herschel-SPIRE photometer. We describe the models it uses and the form of the input and output data. Methods. The SPIRE photometer simulator is a software package which uses theoretical models, along with flight model test data, to perfor...
We report on the sensitivity of SPIRE photometers on the Herschel Space Observatory. Specifically, we measure the confusion noise from observations taken during the Science Demonstration Phase of the Herschel Multi-tiered Extragalactic Survey. Confusion noise is defined to be the spatial variation of the sky intensity in the limit of infinite integration time, and is found to be consistent amon...
The 2.12μm v=1–0 S(1) line of molecular hydrogen has been imaged in the Hourglass region of M8. The line is emitted from a roughly bipolar region, centred around the O7 star Herschel 36. The peak H2 1–0 S(1) line intensity is 8.2× 10−15 erg s−1 cm−2 arcsec−2. The line centre emission velocity varies from −25 km s−1 in the SE lobe to +45km s−1 in the NW lobe. The distribution is similar to that ...
The shear augmented dispersion of solutes in blood flow i through circular tube and ii between parallel flat plates is analyzed mathematically, treating blood as Herschel-Bulkley fluid model. The resulting system of nonlinear differential equations are solved with the appropriate boundary conditions, and the expressions for normalized velocity, concentration of the fluid in the core region and ...
The 2.12μm v=1–0 S(1) line of molecular hydrogen has been imaged in the Hourglass region of M8. The line is emitted from a roughly bipolar region, centred around the O7 star Herschel 36. The peak H2 1–0 S(1) line intensity is 8.2× 10 −15 erg s cm arcsec. The line centre emission velocity varies from −25 km s in the SE lobe to +45km s in the NW lobe. The distribution is similar to that of the CO...
We present Herschel-SPIRE observations of the perturbed galaxy NGC 4438 in the Virgo cluster. These images reveal the presence of extra-planar dust up to ∼4–5 kpc away from the galaxy’s disk. The dust closely follows the distribution of the stripped atomic and molecular hydrogen, supporting the idea that gas and dust are perturbed in a similar fashion by the cluster environment. Interestingly, ...
In these proceedings I discuss various extragalactic surveys which will be undertaken over the next few years and which will be complementary to any HI and/or continuum surveys with the SKA-precursor telescopes. I concentrate on the near-infrared public surveys which will be undertaken with the Visible and Infrared Survey Telscope for Astronomy (VISTA), and in particular the VISTA Deep Extragal...
(abridged) Within the Orion A molecular cloud, integral-shaped filament (ISF) is a prominent, degree-long structure of dense gas and dust, with clear signs recent on-going high-mass star formation. We used ArTeMiS bolometer camera at APEX to map 0.6x0.2 deg^2 region covering OMC-1, OMC-2, OMC-3 350 450 micron. combined these data Herschel-SPIRE maps recover extended emission. The Herschel-ArTeM...
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