Sentences with phrase «from galactic centers»

According to a popular scenario explaining the formation and evolution of galaxies and supermassive black holes, radiation from galactic centers — where supermassive black holes locate — can significantly influence the molecular gas (such as CO) and the star formation activities of the galaxies.

Harvard University astrophysicist Charlie Conroy and colleagues studied these two particular clusters because they are far from the galactic centers of the Milky way and Andromeda galaxies; that distance has shielded them from cosmic turbulence and kept them — and any putative dark matter — in a relatively pristine state.

These weak emissions would also be intermixed with many other x-ray sources from the galactic center.

At a certain distance from the galactic center, the rotation curves for stars in most every spiral galaxy simply do not fall; instead, at some point they flatten.

Stars farther from the galactic center unexpectedly appear to move more slowly than stars closer in.

Since the 1950s astronomers have solved this problem using «kinematic distances,» calculations that treat objects in the Milky Way a bit like pieces of flotsam spiraling into a whirlpool; because things tend to move faster as they approach the center, measuring how fast an object is moving toward or away from us yields an estimate of its distance from the galactic center — and thus from our solar system.

The scientists used the Hubble to figure out the direction of the star's travels and the distance from the galactic center, along with the star's mass, age and speed.

One reason: The pattern of gamma - ray photons streaming from the galactic center is clumpy rather than smooth, a strong sign that individual sources of gamma rays (rather than a diffuse cloud of particles that only occasionally interact) may be to blame.

«We're pretty far from the galactic center,» he says, so we're safe «unless the galactic center ramped up to its full power.»

The odds of a planetary system containing habitable worlds far enough away from these stellar explosions increases far from the galactic center, peaking in the outer edges of the spiral arms, the team will report in an upcoming issue of the International Journal of Astrobiology.

Instead, the speed of the stars generally increases with the distance from the galactic center, eventually flattening out at a maximum value.

Forgan and his co-authors found that when galaxies collide, the habitable zone is transformed and then gradually settles back to its general trend: Stars at larger distances from the galactic center have higher chances of hosting planets hospitable to life.

As well as documenting its huge speed, they found that the star could not have originated from the galactic center.

Researchers have long thought that these unbound stars come from the galactic center.

The clouds are about twice as far from the center of the galaxy as our solar system is: Whereas the sun is located about 27,000 light - years from the galactic center the new clouds are 46,000 to 67,000 light - years out.

This fuzzy warmth from the galactic center has puzzled scientists for 30 years and clearer observation of it has led Ghez and her collaborators to conclude that it is most likely superheated interstellar dust on the verge of falling into the black hole in the paper presenting their findings in the current issue of Astrophysical Journal Letters.

This excess appears most prominent at energies between 1 and 3 billion electron volts (GeV)-- roughly a billion times greater than that of visible light — and extends outward at least 5,000 light - years from the galactic center.

With this Hoffmann discovered the far infrared radiation from the galactic center.

A widely accepted idea has described this phenomenon as: the strong radiation from the galactic center in which the supermassive black hole locates ionizes (* 1) the surrounding gas and affects even molecular gas that is the ingredient of star formation; the strong radiation activates (* 2) or suppresses (* 3) the star formation of galaxies.

COS spectra show that the gas is rushing from the galactic center at roughly 2 million miles an hour (3 million kilometers an hour).

All galaxies, including our own, are believed to be embedded in and surrounded with halos of dark matter, which is what astronomers posit causes stars far from the galactic center to move as fast as those near the center.

Giant dust clouds block most of the starlight coming from the galactic center.

Hence, most hyper - velocity stars are believed to originate from the galactic center.

This means stars orbiting around a galaxy should feel less gravitational pull — and orbit more slowly — the farther they are from the galactic center.

We find that the ratios of the 3.4 - 3.6 um features to the 3.3 um feature intensity significantly increase with distance from the galactic center, while the ratios of the 3.3 um feature to the AKARI 7 um band intensity do not.

That's well away from the galactic center and its supermassive black hole.

In the Monoceros patch observed by the SDSS team, the ring appears to extend over 16,000 ly (5,000 parsecs or pc) above and below the galactic plane, with stars below the plane extending about 2,000 pc further from galactic center than those located above the plane; it also appear to be somewhat less than 13,000 ly (4,000 pc) wide.

Previously, astronomers thought that the Milky Way's spiral thin disk petered out at its furthest hypothesized extent of as much as 50,000 ly from the galactic center.

Our Sun, Sol, moves in the same direction at twice this speed but lies only about 26,000 ly from galactic center.

Not exact matches

The fact there must then be tens of thousands of black holes at the galactic center stems from the notion these objects would only very rarely be accompanied by a star to make them glow — most would remain isolated, invisible singletons.

The study appears to vindicate predictions from theorists such as Mark Morris, an astrophysicist at the University of California, Los Angeles, who in 1993 penned a key paper predicting tens of thousands of stellar - mass black holes would form a disk around the galactic center.

That could add to the debate over whether a mysterious excess in gamma rays at the galactic center is from pulsars or dark matter (SN: 12/23/17, p. 12).

An overabundance of black hole X-ray binaries in the galactic center from tidal captures.

In countless galaxies observed to date, stars orbit the galactic center so quickly that gravity alone shouldn't be enough to keep galaxies from flying apart.

Quasar An active galactic nucleus derives its high energy from gas accreting on the center of a supermassive black hole.

Previously, astronomers have used x-ray telescopes to observe strong winds very near the massive black holes at galactic centers (artist's concept, inset) and infrared wavelengths to detect the vast outflows of cool gas (bluish haze in artist's concept, main image) from such galaxies as a whole, but they've never done so in the same galaxy.

A lack of stars close to the galactic center distinguishes massive galaxies from standard elliptical galaxies, which are much brighter in their cores.

The Milky Way's galactic center, with its 4 million solar mass black hole, is located approximately 26,000 light - years from Earth in the direction of the constellation Sagittarius.

While the great amount of dark matter expected at the galactic center should produce a strong signal, competition from many other gamma - ray sources complicates any case for a detection.

Hubble images showed, on the contrary, that quasars always occur at the cores of distant galaxies and derive their energy from material being sucked into black holes that lie even deeper within the galactic centers.

When astronomers carefully subtract all known gamma - ray sources from LAT observations of the galactic center, a patch of leftover emission remains.

Using publicly available data from NASA's Fermi Gamma - ray Space Telescope, independent scientists at the Fermi National Accelerator Laboratory (Fermilab), the Harvard - Smithsonian Center for Astrophysics (CfA), the Massachusetts Institute of Technology (MIT) and the University of Chicago have developed new maps showing that the galactic center produces more high - energy gamma rays than can be explained by known sources and that this excess emission is consistent with some forms of dark mCenter for Astrophysics (CfA), the Massachusetts Institute of Technology (MIT) and the University of Chicago have developed new maps showing that the galactic center produces more high - energy gamma rays than can be explained by known sources and that this excess emission is consistent with some forms of dark mcenter produces more high - energy gamma rays than can be explained by known sources and that this excess emission is consistent with some forms of dark matter.

The galactic center teems with gamma - ray sources, from interacting binary systems and isolated pulsars to supernova remnants and particles colliding with interstellar gas.

In addition, these stars are not orbiting the galactic center inside the Milky Way's spiral arms like the Sun, but they originate from the spherical Galactic halo that surrounds the Milky Way's main disk, while briefly intersecting it in their long, elliptical orbits around the center.

Furthermore, particle flux upper limits are reported from selected candidate sources such as the galactic center region.

Her dissertation work focused on studying and modeling the extremely energetic outflows from active black holes at galactic centers.

At first glance it looks like the Milky Way is at the center of the universe and it committed some galactic social blunder because all of the other galaxies are rushing away from it (there are a few true galactic friends like the Andromeda Galaxy that are approaching it).

This illustration shows the connection between measurements of the galactic center region from the H.E.S.S. observatory in the TeV energy range and the derived flux upper limit from the Pierre Auger Observatory in the EeV energy range.

From this perspective, astronomers have been actively working on the starburst regions of galaxies (* 1) and the active galactic nuclei (AGN) at the center of galaxies, which are called circumnuclear disks (CND)(* 2).

However, other measurements taken by a team of researchers from the University of Strasbourg in France appear to show that stars just outside of Triangulum II are moving faster than the ones close to the galactic center — which were used by Kirby to determine the galaxy's mass.