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TOPIC: Distant Galaxies
Blobrana


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Posts: 131433
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Bootes Field
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Bootes Field: New Panorama Reveals More Than a Thousand Black Holes
A new wide-field panorama reveals more than a thousand supermassive black holes in the centres of galaxies, some up to several billion times more massive than the sun. This survey, taken in a region of the Bootes constellation, involved 126 separate Chandra exposures of 5,000-seconds each, making it the largest contiguous field ever obtained by the observatory. At 9.3 square degrees, it is over 40 times larger than the full moon seen on the night sky, which is also shown in this graphic for scale. In this image, the red represents low-energy X-rays, green shows the medium range, and blue the higher energy X-rays.

bootesPan
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Credit: X-ray: NASA/CXC/CfA/R.Hickox et al.

Position(J2000) : RA 14h 32m 00.00s | Dec +34ş 06' 00.00"

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Blobrana


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The AEGIS Survey
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The AEGIS Survey is unlocking the secrets of galaxy and large-scale structure formation over the last 9 billion years.
AEGIS is targeted on a special area of the sky, called the Extended Groth Strip (EGS), that has been observed with the world's most powerful telescopes on the ground and in space, from X-rays to radio waves.
Each telescope contributes its own key information to create a complete portrait of every galaxy. By looking out far into space and back in time, AEGIS literally shows us galaxies in all their glory that are emerging from infancy into adulthood.

http://aegis.ucolick.org/

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Blobrana


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Distant Galaxies
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A massive project to generate an all-colour map of the galaxies in a small area of sky, utilizing four satellite telescopes and four ground-based telescopes, is yielding new information about the universe's "pre-teen" years and the early evolution of galaxies and galaxy clusters.
Called the All-wavelength Extended Groth Strip International Survey (AEGIS), the five-year project involved the cooperation of more than 50 researchers from around the world observing the same small region of sky in the radio, infrared, visible, ultraviolet and X-ray regions of the electromagnetic spectrum. The target area, called the Extended Groth Strip, covers an area the width of two full moons that is a hop, skip and a jump from the end of the Big Dipper's handle.

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Blobrana


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A new study using data collected by the W. M. Keck Observatory in Hawaii has revealed that certain fundamental properties of galaxies have actually changed very little over the last 8 billion years, nearly half of the age of the universe.
According to the research, the relationship between a galaxy’s mass and a new speed indicator that measures movement of its stars and gas remains the same for all forms of galaxies, from spirals like our own Milky Way, to elliptical galaxies, and even the so-called "train wrecks" left over by galactic mergers.

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Blobrana


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Posts: 131433
Date:
AEGIS survey
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AEGIS survey reveals new principle governing galaxy formation and evolution
Faced with the bewildering array of galaxies in the universe, from orderly spirals to chaotic mergers, it is hard to imagine a unifying principle that describes them all with mathematical precision. But that is just what astronomers have now discovered.
The relation between a galaxy's mass and the orbital speed of its stars and gas is remarkably consistent over a wide range of galaxy morphologies and over billions of years of galaxy evolution, according to new results from a major survey of distant galaxies. The findings show that certain fundamental properties of galaxies have actually changed very little over the past 8 billion years (about half the age of the universe).

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Blobrana


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RE: Distant Galaxies
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Several hundred images taken with NASA's Hubble Space Telescope have been woven together into a rich tapestry of at least 50,000 galaxies. The Hubble view is yielding new clues about the universe's youth, from  its "pre-teen" years to young adulthood.
The snowstorm of galaxies in the Hubble panorama does not appear evenly spread out. Some galaxies seem to be grouped together. Others are scattered through space. This uneven distribution of galaxies traces the concentration of dark matter, an invisible web-like structure stretching throughout space. Galaxies form in areas rich in dark matter.

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A narrow slice of sky near the Big Dipper yielded a goldmine of at least 50,000 galaxies, which were spied by NASA's Hubble Space Telescope. The Hubble view is yielding new clues about the universe's youth, from its "pre-teen" years to young adulthood.
The image at left, taken by Akira Fujii with a backyard telescope, shows the location of the Hubble observations near the Big Dipper.
Credit NASA

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Blobrana


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Posts: 131433
Date:
Tully-Fisher relation of galaxies
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Title: The Tully-Fisher relation of galaxies at z~0.85 in the DEEP2 survey
Authors: Kuenley Chiu (1), Steven P. Bamford (2), Andrew Bunker (1) ((1) University of Exeter, (2) University of Portsmouth)

Local and intermediate redshift (z~0.5) galaxy samples obey well correlated relations between the stellar population luminosity and maximal galaxy rotation that define the Tully-Fisher (TF) relation. Consensus is starting to be reached on the TF relation at z~0.5, but work at significantly higher redshifts is even more challenging, and has been limited by small galaxy sample sizes, the intrinsic scatter of galaxy properties, and increasing observational uncertainties. We present here the TF measurements of 41 galaxies at relatively high redshift, spectroscopically observed with the Keck/DEIMOS instrument by the DEEP2 project, a survey which will eventually offer a large galaxy sample of the greatest depth and number yet achieved towards this purpose. The 'first-look' sample analysed here has a redshift range of 0.75<z<1.3 with <z>= 0.85 and an intrinsic magnitude range from M_B of -22.66 to -20.57 (Vega). We find that compared to local fiducial samples, a brightening of 1.5 magnitudes is observed, and consistent with passive evolutionary models.

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Blobrana


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RE: Distant Galaxies
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Using a map of more than 4,000 luminous quasars in the distant universe, scientists from the Sloan Digital Sky Survey (SDSS-II) have shown that these brilliant beacons are strongly clumped, with huge quasar superclusters separated by vast stretches of empty space. The strong clustering shows that the quasars lie within massive concentrations of dark matter.

"Previous maps showed that more nearby quasars cluster like 'normal' galaxies. But the clustering in our map is ten times stronger, the difference between a high contrast photograph and a washed-out Xerox." - Princeton University graduate student Yue Shen, who led the study.

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Blobrana


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Title: Discovery of a Probable Physical Triple Quasar
Authors: S.G. Djorgovski, F. Courbin, G. Meylan, D. Sluse, D.J. Thompson, A. Mahabal, E. Glikman

We report the discovery of the first known probable case of a physical triple quasar (not a gravitational lens). A previously known double system, QQ 1429-008 at z = 2.076, is shown to contain a third, fainter QSO component at the same redshift within the measurement errors. Deep optical and IR imaging at the Keck and VLT telescopes has failed to reveal a plausible lensing galaxy group or a cluster, and moreover, we are unable to construct any viable lensing model which could lead to the observed distribution of source positions and relative intensities of the three QSO image components. Furthermore, there are hints of differences in broad-band spectral energy distributions of different components, which are more naturally understood if they are physically distinct AGN. Therefore, we conclude that this system is most likely a physical triple quasar, the first such close QSO grouping known at any redshift. The projected component separations in the restframe are ~ 30 - 50 kpc for the standard concordance cosmology, typical of interacting galaxy systems. The existence of this highly unusual system supports the standard picture in which galaxy interactions lead to the onset of QSO activity.

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Blobrana


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Posts: 131433
Date:
LBQS 1429-008
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Astronomers have found the first example of a triple quasar, the American Astronomical Society meeting in Seattle has heard.
Quasars are powerful sources of energy, thought to be powered by "supermassive" black holes.
At first, researchers thought the triplet was just an illusion, caused by the splitting of light beams.
But a team using Hawaii's WM Keck Observatory has found the system really involves three black holes.

LBQS 1429-008
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