نتایج جستجو برای: interstellar matter
تعداد نتایج: 224266 فیلتر نتایج به سال:
Over the course of its motion through the Galaxy, our solar system has encountered many interstellar environments of varying characteristics. Interstellar medium (ISM) density variations spanning seven orders of magnitude are commonly seen throughout the general Galactic environment, and a sufficiently dense cloud within this range has the potential to dramatically alter the structure of the he...
We determine the total enclosed mass profile from 0.7 to 35 kpc in the elliptical galaxy NGC 4636 based on the hot interstellar medium temperature profile measured using the Chandra X-ray Observatory, and other X-ray and optical data. The total mass increases as r 1.2 to a good approximation over this range in radii, attaining a total of ∼ 1.5 × 10 12 M ⊙ (corresponding to M tot /L V = 40) at 3...
A class of exact solutions of the Einstein field equations representing non-static wormholes that obey the weak and dominant energy conditions is presented. Hence, in principle, these wormholes can be built with less exotic matter than the static ones. PACS numbers: 04.20.Jb, 04.20.Cv, 04.60.+n, 03.70.+k e-mail address: [email protected] e-mail address: [email protected] 1 The idea of wormholes ...
ABSTRACT Primordial black holes are a viable dark matter candidate. They decay via Hawking evaporation. Energetic particles from the radiation interact with interstellar gas, depositing their energy as heat and ionization. For sufficiently high temperature, fast electrons produced by deposit substantial fraction of through Coulomb interaction. Using dwarf galaxy Leo T, we place an upper bound o...
Water nanoclusters ejected into interstellar space from abundant amorphous ice-coated cosmic dust offer a hypothetical scenario connecting major mysteries of our universe: dark matter, energy, cosmology, astrobiology, and the RNA world. Cosmic water also exhibit dipole-moment anisotropy prerequisite to their birefringence property, which may explain recent CMB data possibly supporting quintesse...
Seven particles captured by the Stardust Interstellar Dust Collector and returned to Earth for laboratory analysis have features consistent with an origin in the contemporary interstellar dust stream. More than 50 spacecraft debris particles were also identified. The interstellar dust candidates are readily distinguished from debris impacts on the basis of elemental composition and/or impact tr...
Cold interstellar gas clouds provide an exciting new method to discover dark matter. Their immense size makes them uniquely sensitive interactions from the heaviest, most rarefied matter models. Using cloud observations, we derive constraints on heavy composite coupled Standard Model through a light photon for up thousand solar masses. We find that are also very large interacts with nuclei fixe...
There is now strong evidence suggesting that the CO J=1–0 transition, widely used to trace H2 gas, significantly underestimates its mass in metal-poor regions. In spiral disks such regions are found in large galactocentric distances where we show that any unaccounted H2 gas phase is likely to be diffuse (n ∼ 5− 20 cm−3) and warmer (Tkin ∼ 50− 100 K) than the cool (Tkin ∼ 15− 20 K) CO-luminous o...
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