نتایج جستجو برای: iram
تعداد نتایج: 656 فیلتر نتایج به سال:
XPOL, the first correlation polarimeter at a large millimeter telescope, uses a flexible digital correlator to measure all four Stokes parameters simultaneously, i.e. the total power I, the linear polarization components Q and U , and the circular polarization V . The versatility of the backend provides adequate bandwidth for efficient continuum observations as well as sufficient spectral resol...
T he importance of an efficient memory system is increasing as fabrication processes scale down, yielding faster processors and larger memories. This trend widens the processor-memory gap. Not long ago, off-chip main memory was able to supply the CPU with data at an adequate rate. Today, with processor performance increasing at a rate of about 60 percent per year and memory latency improving by...
Context. Class I protostars are a bridge between 0 (≤10 5 yr old), and II (≥10 6 yr) protoplanetary disks. Recent studies show gaps rings in the dust distribution of disks younger than 1 Myr, suggesting that planet formation may start already at stage. To understand what chemistry planets will inherit, it is crucial to characterize sources investigate how chemical complexity evolves from Aims. ...
Based on astrochemical theory, the complex molecular composition around high-mass YSOs should evolve from the outer envelope in toward the central hot region as a sequence of temperature dependent chemical pathways are activated in ices and in the gas-phase. The resulting complex molecules have been broadly classified into three generations dependent on the temperature (<25, >25, and >100 K) re...
Using the Max-Planck Millimeter Bolometer Array (MAMBO) at the IRAM 30m telescope we detected emission at 250 GHz from the Centaur Chariklo (1997 CU26). The observed continuum flux density implies a photometric diameter of 273 km. The resulting geometric albedo is 0.055, somewhat higher than expected from a comparison with most of the other few Centaurs and cometary nuclei for which such data a...
We present high resolution (1. 1×0. 9) imaging of the protoplanetary nebula AFGL 2688 in the CO (J=2–1) line using the IRAM interferometer. The observations reveal with unprecedented detail the structure and the kinematics of the gas ejected by the star over the past few hundred years and exemplify the mechanism by which point symmetries are imprinted on the structure of planetary nebulae at ea...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید