«The fact that we see
young galaxies in the distant universe that have already shut down star formation is remarkable.»
Given this and other recent finds, astronomers either have been phenomenally lucky — or, more likely, they have underestimated substantially the number of small, very
young galaxies in the early Universe.
Not exact matches
«Beware of the dark side,» Yoda warned
young Luke Skywalker, and apparently the advice holds even
in a
galaxy far, far away from the Star Wars universe.
On average stars
in spiral
galaxies tend to be much
younger than those
in ellipticals.
The field is so small that only a few foreground stars
in the Milky Way lie within it; thus, almost all of the 3,000 objects
in the image are
galaxies, some of which are among the
youngest and most distant known.
Many other potential applications of this dataset are explored
in the series of papers, and they include studying the role of faint
galaxies during cosmic reionisation (starting just 380,000 years after the Big Bang),
galaxy merger rates when the Universe was
young, galactic winds, star formation as well as mapping the motions of stars
in the early Universe.
Young star clusters and clouds of hydrogen that formed
in our
galaxy help trace the shapes of the Milky Way's arms, so astronomers are reasonably certain that it has a spiral structure (see right).
«It appears that the
young stars
in the early
galaxies like EGS - zs8 - 1 were the main drivers for this transition, called reionization,» said Rychard Bouwens of the Leiden Observatory, co-author of the study.
YOUTHFUL runaways are nothing new — even
in space, where a brush with a black hole can eject
young stars from the
galaxy.
But new observations from NASA's Hubble Space Telescope have revealed ancient stars mingled with the
young ones, proving the
galaxy as a whole is
in fact as old as its neighbors.
Radiation from
young stars, as well as from gas spiralling into black holes at the
galaxies» cores, heats up dust, making the
galaxies glow brightly
in the infrared.
Using the Very Large Array of the National Radio Astronomy Observatory
in the US, the team observed radio emission from hydrogen
in a distant
galaxy and found that it would have contained billions of
young, massive stars surrounded by clouds of hydrogen gas.
Such
galaxies are rare, but astronomers believe that they were more common
in the past, when the Universe was
younger.
«What our observations of
galaxies in the early universe tells us is these very early
young galaxies at the dawn of the universe and their growing baby black holes already had some deep fundamental connection between them,» Schawinski said.
«Not only did we detect radio signals emitted by distant
galaxies when the Universe was three billion years
younger, but their gas reservoirs turned out to be unexpectedly large, about 10 times larger than the mass of hydrogen
in our Milky Way.
The study, published online today
in The Astrophysical Journal Letters, describes how the researchers used the powerful MOSFIRE instrument on the W. M. Keck Observatory's 10 - meter telescope
in Hawaii to peer into a time when the universe was still very
young and see what the
galaxy looked like only 670 million years after the big bang.
Westerlund 1 thus appears to be the most massive compact
young cluster yet identified
in the Milky Way
galaxy.
But around the same time studies of very distant
galaxies, which we see as they were when the Universe was very
young, were setting constraints on the amount of baryonic matter
in the Universe (New Scientist, Science, 30 April).
Some stars
in globular clusters may be 15 billion years old, he says, but the great bulge at the center of the Milky Way — a
younger part of the
galaxy, according to conventional wisdom — actually holds stars that are 1 or 2 billion years older.
They point out that the few stars that are found
in LSBs are mostly hot and blue, indicating that they are
young and suggesting that these dim
galaxies were probably even dimmer
in the past and are just now getting around to forming stars.
Describing the discovery October 16
in Astrophysical Journal Letters, the team of astronomers led by Arjen van der Wel of the Max Planck Institute for Astronomy
in Heidelberg, Germany report that the lensing
galaxy is relatively light,
young and bursting with new stars.
The evidence for
young massive
galaxies is the best yet, agrees astrophysicist Laura Ferrarese of Rutgers University
in Piscataway, New Jersey.
Young stars
in the
galaxies shed dust that blocked visible light from escaping into space.
Aging red giant stars coexist with their more plentiful
younger cousins, the smaller, white, Sun - like stars,
in this crowded region of our
galaxy's ancient central hub, or bulge.
As Bregman hoped, dozens of
young stars turned up
in each of the three promising
galaxies — and as an added surprise, they even appeared
in Messier 105.
The rate of star formation is a small fraction of what goes on
in a
younger galaxy like the Milky Way, but even these low levels of activity will force theorists to revise their models of how
galaxies evolve.
The giant scope will also examine the composition of matter
in distant
young galaxies.
The final picture shows the
galaxies that form
in the model, colour coded according to age so that red objects are the oldest, yellow ones are intermediate and blue are the
youngest.
Astronomers have discovered five full - sized
galaxies in the extremely distant — and therefore extremely
young — universe.
Young stars (yellow band) surrounding the core of this dusty
galaxy show up
in the NICMOS image (top), but not
in the optical image.
He decided to point Hubble's Wide Field Camera 3, an addition made to the scope
in 2009, at four nearby aging
galaxies to hunt for the telltale ultraviolet glow of
young stars.
Although the discovery doesn't prove that complex organic structures originated
in space, it does present strong evidence that the basic ingredients for living organisms exist elsewhere
in the
galaxy — and that they could be seeding many
young planets with life's building blocks.
While the new study adds to the Milky Way's tally of star - forming regions, it may not substantially boost our
galaxy's star total because the
young, massive stars focused on
in this study make up only a small percentage of the overall population.
An international team studying gas clouds
in a distant
galaxy has found that the temperature of the gas matches almost exactly what models predicted for the
young cosmos.
A new study led by University of California, Riverside astronomers casts light on how
young, hot stars ionize oxygen
in the early universe and the effects on the evolution of
galaxies through time.
To make matters worse, the magnified object is a starbursting dwarf
galaxy: a comparatively light
galaxy (it has only about 100 million solar masses
in the form of stars [3]-RRB-, but extremely
young (about 10 - 40 million years old) and producing new stars at an enormous rate.
The light from these
galaxies took over 12 billion years to reach the telescope, allowing the astronomers to look back
in time when the universe was still very
young.
It is also located
in a much smaller and
younger host
galaxy, and is only detected during a single, several - hour burst.
This correlation hints that black holes and their
galaxies grew up
in lockstep when the cosmos was
young.
The researchers mapped thousands of star clusters
in the attractive barred spiral
galaxy M83 (shown), 15 million light - years from Earth, finding that the percentage of
young stars
in clusters declines from the urban core to the suburbs: Four thousand light - years from M83's center, 19 % of
young stars belong to clusters, whereas 13,000 light - years out, just 7 % do.
Neal Evans, an astronomy professor at the University of Texas at Austin, credits the researchers for broadening the observational window from the somewhat anomalous luminous events to include run - of - the - mill
galaxies in the fairly
young universe.
Like any spiral
galaxy, M106 has a pair of arms full of bright
young stars (green), but researchers have long wondered at the source of its two extra arms (purple and blue), visible
in radio and X-ray images.
[4] Very little is known about the origin and characteristics of the magnetic fields that were present
in our
galaxy when it was
young, so it is unclear whether they have grown stronger over time, or decayed.
In lieu of a working time machine, we learn about the birth of our Sun and its planets by studying young stars in our galax
In lieu of a working time machine, we learn about the birth of our Sun and its planets by studying
young stars
in our galax
in our
galaxy.
The newfound
young star clusters lie thousands of light - years below the plane of our Milky Way
galaxy, a flat spiral disk seen
in this artist's conception.
«We checked the age, estimated by observation, of some outliers
in the GMS, and indeed they are always very
young galaxies.»
There aren't any monstrous
galaxies left
in the modern Universe, but astronomers believe that these
young galaxies matured into giant elliptical
galaxies which are seen
in the modern Universe.
More than that, further validation could arrive very soon: «Out theory
in fact implies that outlier
galaxies, which are
young and have very high star formation rates, are still rich
in gas, and this will allow us to study them
in depth by using the ALMA interferometer.»
The team compared the positions of these
galaxies with the location of a cluster of
young galaxies 11.5 billion light - years from Earth
in SSA22 which had been studied
in visible light by the Subaru Telescope, operated by the National Astronomical Observatory of Japan (NAOJ).
Young blue stars, star clusters and tidal dwarf
galaxies are born
in these tidal debris.