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Examples of Accretion

Sentences with the noun Accretion

14 examples:

Nothing happens quite by chance. It's a question of accretion of information and experience.
(Jonas Salk)

Differentiated planetesimals may have delivered iron-rich material to Earth in giant impacts at the end of accretion.
(Nature Geoscience, )

We analysed deep-sea archives from all major oceans for 60Fe deposition via the accretion of interstellar dust particles.
(Nature, )

These worlds, despite their modest sizes, have much to teach us about the accretion of the Solar System and its dynamical evolution.
(Nature Physics, )

The spin of a planet arises from the accretion of angular momentum during its formation, but the details of this process are still unclear.
(Nature, )

Astronomers have suspected for some time that magnetic fields are a key ingredient in the accretion of material that surrounds young stars.
(Nature, )

Supermassive black holes in galaxy centres can grow by the accretion of gas, liberating energy that might regulate star formation on galaxy-wide scales.
(Nature, )

Experiments suggest that the accretion of a differentiated planetary body to the growing Earth could explain the silicate Earth’s carbon and sulfur budgets.
(Nature Geoscience, )

The unexpected morphology suggests that the role of the magnetic field in the accretion of a T Tauri star is more complex than our current theoretical understanding.
(Nature, )

This implies that neutron stars may not be rare in the ultraluminous X-ray population, and it challenges physical models for the accretion of matter onto magnetized compact objects.
(Nature, )

Here, the authors synthesize a fayalite standard and report reliable ages of secondary fayalite, from which model accretion ages are determined and the place of accretion is inferred.
(Nature Communications, )

In between, the system’s properties depend primarily on the mass-transfer rate: if it is lower than a billionth of a solar mass per year, the accretion becomes unstable and the matter is dumped onto the white dwarf during quasi-periodic dwarf nova outbursts.
(Nature, )

Quasars are associated with and powered by the accretion of material onto massive black holes; the detection of highly luminous quasars with redshifts greater than z = 6 suggests that black holes of up to ten billion solar masses already existed 13 billion years ago.
(Nature, )

In modern and ancient examples of long-lived accretionary orogens, the overriding plate is subjected to episodes of crustal extension and back-arc basin development, often related to subduction rollback and transient episodes of orogenesis and crustal shortening, coincident with accretion of exotic crust.
(Nature, )

Other sentences

72 examples:

The most successful men in the end are those whose success is the result of steady accretion.
(Alexander Graham Bell)

The geometry is strongly suggestive of a cold accretion flow.
(Nature, )

They are thought to be powered by accretion onto a compact object.
(Nature, )

Attempts to observe directly signatures of accretion onto protoplanets have hitherto proven unsuccessful.
(Nature, )

Still forming under the action of gravitational instability, they grow in mass by accretion of supersonic flows.
(Nature, )

At z > 2, supermassive black holes are thought to grow mostly by merger-driven accretion leading to high spin.
(Nature, )

Accretion of matter onto black holes is universally associated with strong radiative feedback and powerful outflows.
(Nature, )

In particular, black-hole transients have outflows whose properties are strongly coupled to those of the accretion flow.
(Nature, )

Using a Monte Carlo accretion code, we estimate the location, timing, sizes, and velocities of chondrule-forming impacts.
(Nature, )

After that the nova awakes again—with accretion returning to the pre-eruption level and leading to a new nova explosion.
(Nature, )

This study presents direct measurements of intertidal oyster reef growth and develops an empirical model of reef accretion.
(Nature Climate Change, )

Vaporization and recondensation of impacting planetesimal cores during accretion may reconcile disparate lines of evidence.
(Nature Geoscience, )

2014 MU69 is believed to be one of the first building blocks of the Solar System and may shed light on planetary accretion.
(Tech Times - Science, )

Noble gas isotopes are powerful tracers of the origins of planetary volatiles, and the accretion and evolution of the Earth.
(Nature, )

The loss of mass from protostars, in the form of a jet or outflow, is a necessary counterpart to protostellar mass accretion.
(Nature, )

Previous hypotheses for its origin have included late accretion events, large impacts, tidal effects and convection processes.
(Nature, )

Although preliminary, the associations between bioactive components in HBM highlight the importance HBM has on bone accretion.
(BoneKEy Reports, )

Our results demonstrate that in P13, soft thermal emission and spectral curvature are indeed signatures of supercritical accretion.
(Nature, )

Prior studies based on modelling decaying flux trends have been able to estimate broad properties, such as the mass accretion rate.
(Nature, )

This model is known as ‘pebble accretion’; theoretically, it can produce cores of ten Earth masses in only a few thousand years.
(Nature, )

But now researchers have discovered a system consisting of two stars with three rotating planet-forming accretion discs around them.
(Science Daily - News, )

Accretion in microquasars varies on much shorter timescales than in quasars and occasionally produces exceptionally bright X-ray flares.
(Nature, )

They are thought to shine so brightly because hot material is glowing fiercely as it falls into the black hole, a process known as accretion.
(Science Daily - News, )

If the squared magnetic field is proportional to the accretion rate, then there will be a correlation between jet power and accretion luminosity.
(Nature, )

Since planetary accretion, water has been exchanged between the hydrosphere and the geosphere, but its depth distribution in the mantle remains elusive.
(Nature, )

Here we report that impacts can produce enough chondrules during the first five million years of planetary accretion to explain their observed abundance.
(Nature, )

Acidification-induced reductions in calcification are projected to shift coral reefs from a state of net accretion to one of net dissolution this century.
(Nature, )

The concentration of highly siderophile elements (HSEs) in Earth’s mantle constrains the mass of chondritic material added to Earth during Late Accretion.
(Nature, )

The Moon is generally thought to have formed from the debris ejected by the impact of a planet-sized object with the proto-Earth towards the end of planetary accretion.
(Nature, )

Observational evidence of accretion events is provided by the coherent stellar streams crossing the outer haloes of massive galaxies, such as the Milky Way or Andromeda.
(Nature, )

There is evidence for such a correlation, but inadequate knowledge of the accretion luminosity of the limited and inhomogeneous samples used prevented a firm conclusion.
(Nature, )

The data used as the basis for the image offered the first observational evidence of chaotic cold accretion, or “cold intergalactic rain,” on a supermassive black hole.
(The New York Times - Science, )

Driven by gravity, massive structures like galaxies and clusters of galaxies are believed to grow continuously through hierarchical merging and accretion of smaller systems.
(Nature, )

Cooling can be regulated by feedback from accretion of cooling gas onto the central black hole, but requires an accretion rate finely tuned to the thermodynamic state of the hot gas.
(Nature, )

Recently, a large and luminous filament, consistent with such a cold accretion flow, was discovered near the quasi-stellar object QSO UM287 at redshift 2.279 using narrow-band imaging.
(Nature, )

Here we describe the structure and accretion modes of two end-member types of oceanic lithosphere using a detailed seismicity survey along 390 kilometres of ultraslow-spreading ridge axis.
(Nature, )

Xenon isotope systematics support a clear distinction between mid-ocean-ridge and continental or oceanic plume sources, with chemical heterogeneities dating back to the Earth’s accretion.
(Nature, )

Numerical and statistical models suggest that Mercury and other metallic planetary bodies could be survivors of accretion that had their mantles stripped in collisions with larger impactors.
(Nature Geoscience, )

Using core-formation models, we show that extreme events during Earth’s accretion (such as the Moon-forming giant impact) could have contributed large amounts of magnesium to the early core.
(Nature, )

It is not known, however, whether below z ≈ 1 these black holes continue to grow by coherent accretion or in a chaotic manner, though clear differences are predicted in their spin evolution.
(Nature, )

Partitioning experiments suggest that the ratio of these elements is controlled by oxygen fugacity, and thus can be used to constrain the redox conditions of planetary accretion and core formation.
(Nature Geoscience, )

We estimate (on the basis of a near-infrared spectrum) that the black hole has a mass of ∼1.2 × 1010, which is consistent with the 1.3 × 1010 derived by assuming an Eddington-limited accretion rate.
(Nature, )

The spin-down power is an order of magnitude larger than that seen in electromagnetic radiation, which, together with an absence of obvious signs of accretion, suggests that AR Sco is primarily spin-powered.
(Nature, )

By analogy, ultraluminous X-ray sources with similar X-ray spectra and luminosities of up to a few times 1040 ergs per second can be explained by supercritical accretion onto massive stellar-mass black holes.
(Nature, )

Astronomers have solved the mystery of why most super massive black holes have such a low accretion rate -- that is, they feed on very little of the available gases, instead acting as if they are on a severe diet.
(Science Daily - News, )

Mangrove forests have the capacity to keep pace with sea-level rise and to avoid inundation through vertical accretion of sediments, which allows them to maintain wetland soil elevations suitable for plant growth.
(Nature, )

We find that the outflowing wind is neutral, has a large covering factor, expands at one per cent of the speed of light and triggers a nebular phase once accretion drops sharply and the ejecta become optically thin.
(Nature, )

We use a large number of N-body simulations to demonstrate a relationship between the time of the last giant impact on an Earth-like planet and the amount of mass subsequently added during the era known as Late Accretion.
(Nature, )

The lack of sufficient energy resolution in previous analyses has prevented an unambiguous identification of any emission or absorption lines in the X-ray band, thereby precluding a detailed analysis of the accretion flow.
(Nature, )

Hydrodynamic simulations suggest that ‘cold accretion flows’—relatively cool (temperatures of the order of 104 kelvin), unshocked gas streaming along filaments of the cosmic web into dark-matter halos—are important.
(Nature, )

The high spin found here is indicative of growth by coherent accretion for this black hole, and suggests that black-hole growth at 0.5 ≤ z ≤ 1 occurs principally by coherent rather than chaotic accretion episodes.
(Nature, )

The main physical driver of Eigenvector 1 has long been suspected to be the quasar luminosity normalized by the mass of the hole (the ‘Eddington ratio’), which is an important parameter of the black hole accretion process.
(Nature, )

Such ‘episodic’ ejection events have been observed during the class 0 protostellar phase (the early accretion stage), and continue during the subsequent class I phase that marks the first one million years of star formation.
(Nature, )

This result revolves around the approximately constant efficiency of turbulence generation from the gravitational energy that is freed during mass accretion, revealed by our computational model of cosmological structure formation.
(Nature, )

The notable structural similarities between the two lobes of comet 67P/Churyumov–Gerasimenko indicate that the early-forming cometesimals experienced similar primordial stratified accretion, even though they formed independently.
(Nature, )

The detection of a discrete knot of particle emission from the active galaxy M81* reveals that black hole accretion is self-similar with regard to mass, producing the same knotty jets irrespective of black hole mass and accretion rate.
(Nature Physics, )

The authors of this Review argue that changes to carbonate dissolution in an acidifying ocean, which have been relatively overlooked, are potentially more important than calcification for the future accretion and survival of coral reef ecosystems.
(Nature Climate Change, )

Researchers show that sea-level rise is a primary factor driving historical shoreline changes (that is, beach erosion or accretion) in Hawaii and that historical rates of shoreline change are about two orders of magnitude greater than sea-level rise.
(Science Daily - News, )

Type Ia supernovae are thought to be the result of a thermonuclear runaway in carbon/oxygen white dwarfs, but it is uncertain whether the explosion is triggered by accretion from a non-degenerate companion star or by a merger with another white dwarf.
(Nature, )

Possible explanations include accretion onto neutron stars with strong magnetic fields, onto stellar-mass black holes (of up to 20 solar masses) at or in excess of the classical Eddington limit, or onto intermediate-mass black holes (103105 solar masses).
(Nature, )

Given that the inner disks are depleted by accretion onto the stars on timescales of a few thousand years, any replenishing material must be transferred from the outer reservoir to fuel planet formation (which occurs on timescales of about one million years).
(Nature, )

Researchers have created a novel method using micro-computed tomography scans to expose how bioerosion and secondary accretion of corals -- critical processes for reef sustainability -- respond to varying environmental conditions, including changing ocean acidity.
(Science Daily - News, )

The observations show that these cold clouds also fuel black hole accretion, revealing ‘shadows’ cast by the molecular clouds as they move inward at about 300 kilometres per second towards the active supermassive black hole, which serves as a bright backlight.
(Nature, )

The currently observed lunar orbit can naturally be reproduced via interaction with a small quantity of mass (corresponding to 0.00750.015 Earth masses eventually accreted to the Earth) carried by a few bodies, consistent with the constraints and models of late accretion.
(Nature, )

Recent theory and simulations instead predict that accretion can be dominated by a stochastic, clumpy distribution of very cold molecular clouds—a departure from the ‘hot mode’ accretion model—although unambiguous observational support for this prediction remains elusive.
(Nature, )

Here we report observations that reveal a cold, clumpy accretion flow towards a supermassive black hole fuel reservoir in the nucleus of the Abell 2597 Brightest Cluster Galaxy (BCG), a nearby (redshift z = 0.0821) giant elliptical galaxy surrounded by a dense halo of hot plasma.
(Nature, )

Once star formation has been shut down, perhaps during the quasar phase of rapid accretion onto a supermassive black hole, an unknown mechanism must remove or heat the gas that is subsequently accreted from either stellar mass loss or mergers and that would otherwise cool to form stars.
(Nature, )

The offset between the mantles of the Moon and the modern Earth is best explained by assuming that the W isotopic compositions of the two bodies were identical immediately following formation of the Moon, and that they then diverged as a result of disproportional late accretion to the Earth and Moon.
(Nature, )

The deep reservoir now sampled by the Eifel gas had a lower volatile/refractory (iodine/plutonium) composition than the shallower mantle sampled by mid-ocean-ridge volcanism, highlighting the increasing contribution of volatile-rich material during the first tens of millions of years of terrestrial accretion.
(Nature, )

The appearance of a plateau of europium abundance in some dwarf spheroidal galaxies has been suggested as evidence for rare r-process enrichment in the early Universe, but only under the assumption that no gas accretes into those dwarf galaxies; gas accretion favours continual r-process enrichment in these systems.
(Nature, )

Solidification-driven convection was probably common among small body cores, and, in contrast to thermally driven convection, will have led to a relatively late (hundreds of millions of years after accretion), long-lasting, intense and widespread epoch of magnetic activity among these bodies in the early Solar System.
(Nature, )

Here we report observations of reverberation arising from gravitationally redshifted iron Kα photons reflected off the inner accretion flow in the tidal disruption event Swift J1644+57. From the reverberation timescale, we estimate the mass of the black hole to be a few million solar masses, suggesting an accretion rate of 100 times the Eddington limit or more.
(Nature, )

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