Sentences with phrase «at galactic centers»

From supermassive black holes at galactic centers to giant bursts of star formation to titanic collisions between galaxies, these discoveries allow astronomers to probe the current properties of galaxies as well as examine how they formed and developed.

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

Such «supercritical accretion» is thought to be a possible mechanism in the formation of supermassive black holes at galactic centers in very short time periods (which are observed very early in cosmic time).

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.

Hailey and his team used Chandra data because black holes at the galactic center should be most visible via x-rays, produced when the black holes form a binary system with a low - mass star and feed on their captured companion.

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.

Anticipated but never before seen, the existence of tens of thousands of these dark objects at the galactic center could have far - reaching implications for astrophysics

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).

But what happens, Clavel wondered, when it is feeding time at the galactic center?

That wind is driven by intense star - forming activity at the galactic center.

The researchers have shown that the possibility that these objects constitute all of the dark matter in the galaxy is strongly disfavoured by the lack of bright sources observed at the galactic center.

In 1968 astronomers aimed a new tool at the galactic center: the infrared detector, capable of picking up the faint heat thrown off by even lukewarm matter.

Prior to this discovery, researchers could not rule out other explanations for the 2.7 - million - solar - mass gravitational field at our galactic center.

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.

But how does this relatively small magnetic field at the galactic center come to encompass the whole galaxy?

Years of infrared observations have shown a handful of stars at our galactic center whipping around an invisible object with a strong gravitational tug.

The gas outflow driven by a supermassive black hole at the galactic center recently has become the focus of attention as it possibly is playing a key role in the co-evolution of galaxies and black holes.

Not only do the types of stars differ in many ways from what we can see in our serene nighttime sky from Earth, but the stars at the galactic center are also not behaving like the stars around us.

This data can be used to identify what kind of phenomenon is taking place at the galactic center.

Figure 1 and Figure 2 shows the observed galactic center with a radius of 2100 light years and the spectra obtained at the galactic center respectively.

Not exact matches

«Finding evidence for a large number of black holes at the center of the Milky Way confirms a fundamental and major prediction of galactic dynamics,» Hailey says.

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.

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 flatteAt 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 flatteat some point they flatten.

The skinny black line on a plot of stellar rotation speed versus distance was expected to go down — stars close to the galactic center should orbit faster than stars at the edge because all the mass concentrated at the center of the galaxy pulls most powerfully on the closest stars.

«This is by far the widest field of view of the galactic center at high resolution,» says team leader Namir Kassim.

The pulsars can't be seen individually, the researchers say, because they're incredibly small, whereas the width of an image pixel at the distance of the galactic center is about 50 light - years across.

He calculated that the oldest stars in the galactic center had to be at least one billion years older than the oldest stars in globular clusters to allow enough time for so many RR Lyraes to evolve there.

In 2007 astronomers working at Auger traced some of the ultrahigh - energy cosmic rays to nearby active galactic nuclei, the turbulent centers of violent galaxies.

After charting stars in the heart of our galaxy traveling at speeds up to 50 times faster than Earth circles the sun, scientists are convinced that a supermassive black hole is pulling the strings, as only the relentless grip of a supermassive black hole could keep these frenzied stars locked into orbit within the galactic center.

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.

At the same time, he says, the studies refine rather than redefine prior understanding of the nature of the galactic center.

At left is a map of gamma rays with energies between 1 and 3.16 GeV detected in the galactic center by Fermi's LAT; red indicates the greatest number.

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.

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.

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.

The list of accomplishments is far too large to fit within one article, but they include: the first search for extraterrestrial intelligence; creation of the Drake equation; discovery of flat galactic rotation curves; first pulsar discovered in a supernova remnant; first organic polyatomic molecule detected in interstellar space; black hole detected at the center of the Milky Way; determination of the Tully - Fisher relationship; detection of the first interstellar anion; measurement of the most massive neutron star known; first high angular resolution image of the Sunyaev - Zel» Dovich Effect; discovery of only known millisecond pulsar in a stellar triple system; discovery of pebble - sized proto - planets in Orion, and the first detection of a chiral molecule in space.

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 itAt 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 itat 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).

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).

Thus each galaxy that can be seen clearly enough has at its center a MBH, so the masses of the MBH, galaxy and galactic bulge are highly correlated.

M77 is known to have an active galactic nucleus (AGN) at its center which is surrounded by a starburst ring with a radius of 3500 light years.

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

Blazars are active galactic nuclei — energetic regions surrounding massive black holes at the centers of galaxies.

Since most galaxies in the universe are believed to harbor one supermassive black hole at their center, the presence of a binary system is conclusive evidence of a galactic merger.

While traditional imaging techniques at the center of the galaxy cause the stars closest to the galactic center to look fuzzy and indecipherable, Ghez's technique improves the resolution by a factor of at least 20.

Another idea floating around is that FRBs are emitted by active galactic nuclei, or AGNs — superluminous regions at the centers of some galaxies.

It shows the Milky Way from an edge - on perspective with the galactic north pole at the top, south pole at the bottom and galactic center at the center.

A peek at the center of our galaxy, courtesy of the ESO's Very Large Telescope, with Sagittarius A *, our galactic black hole, and S2, a daredevil star that orbits relatively close to Sgr A *, highlighted.

«At longer observing wavelengths, the source would be blurred by free electrons between us and the galactic center, and we wouldn't have enough resolution to see the predicted black hole shadow.

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.