Not exact matches
Editor's note: The findings reported
in this story were later found to be caused by
galactic dust.
In addition, everything behind the
galactic centre is shrouded by a dense wall of stars and
dust, blanking out a whole area of the Milky Way map.
But teasing out this primordial signal is difficult, as swirls
in the CMB could also be caused by
galactic dust, and confidence had started to wane by the official publication of the BICEP2 results
in June.
It also suggests that
dust in extended
galactic haloes may be obscuring our view of the farthest objects
in the Universe.
Since astronomers don't know much about how strongly
galactic dust polarizes light, researchers involved
in the Background Imaging of Cosmic Extragalactic Polarization, or BICEP, experiment relied on whatever information they could get their hands on.
He is a specialist on active
galactic nuclei, superbright
galactic cores thought to be caused by giant black holes sucking
in and heating up quantities of gas and
dust.
Most galaxies
in the universe revolve around central black holes, which feed voraciously on
galactic gas and
dust and spew out radiation.
Using for the first time the newest Planck maps available, Puget and his collaborators have directly examined the polarization of
dust in these high
galactic regions rather than extrapolating from dustier regions
in the plane of the Milky Way.
The three concluded that there was a strong possibility that the signal could have been generated by cosmic
dust in the
galactic foreground rather than by gravitational waves.
Previous Planck analyses did not show the amount of
dust polarization
in that patch of sky or other high -
galactic - latitude regions of the Milky Way because of the relative sparseness of
dust and low signal compared to noise
in these regions (see «Milky Way map skirts question of gravitational waves»).
Dust grains
in the Galaxy could imprint a similar polarization pattern
in the CMB as gravitational waves can, but based on several different predictions of the
galactic contribution the researchers concluded that their data was more likely to originate from primordial gravitational waves.
Averaging over some 350 high -
galactic - latitude patches of sky similar
in size to the region observed by BICEP2, Puget reported that polarization from interstellar
dust grains plays a significant role and might account for much of the BICEP2 signal that had been attributed to inflation - generated gravitational waves.
A popular theory known as the «unified theory» suggests that differences
in the brightness of active
galactic nuclei, as seen from here on Earth, are due to the placement of this donut of obscuring
dust relative to our angle of observation.
The bright center band
in the above image represents heated interstellar
dust as seen along the
galactic plane of the Milky Way.
Many active
galactic nuclei are surrounded by large, dark, donut - shaped clouds of gas and
dust, as seen
in this artist's rendering.
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.
As a result, many specific structural features of the spiral arms are not well known, especially when compared with other spirals observed outside the Milky Way such as Andromeda (which is located a few million ly above the
galactic plane of obscuring
dust in the Milky Way's disk.
Because of all the intervening
dust and gas lying
in the galaxy it is very hard to see much beyond this distance
in the
galactic plane.
We have clearly detected FIR
dust emission extended
in the halo of the galaxy; there are two filamentary emission structures extending from the
galactic disk up to 9 kpc
in the northern and 6 kpc
in the northwestern direct... ▽ More We present new far - infrared (FIR) images of the edge - on starburst galaxy NGC253 obtained with the Far - Infrared Surveyor (FIS) onboard AKARI at wavelengths of 90 um and 140 um.
As for NGC2976, an extended
dust component is observed along the minor axis, which shows a distribution somewhat asymmetrical to the
galactic disk; this might be associated with the HI bridge
in the M81 / M82 group that NGC2976 belongs to.
Detection of the spiral's
dust in a bi-symmetric structure provides strong evidence of its position deep inside the giant elliptical host while the vast amounts of radio, visual, and x-ray emissions are a result of the energy released by this continuing
galactic merger (or «consumption» of a satellite galaxy).
SDSS studies have probed the dark matter environments of quasars through clustering measurements, revealed populations of quasars whose central engines are hidden by obscuring
dust, captured changes
in quasar spectra that show clouds moving
in the gravitational grip of the central black hole, and allowed a comprehensive census of the much fainter accreting black holes (active
galactic nuclei, or AGN)
in present - day galaxies.
We are treated to thundering
galactic fight sequences, accompanied by Wagnerian music, and some eerie scenes
in which characters appear to turn to
dust in front of our eyes.
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