Another experiment carried out in 1990 at the South Pole by Phil Lubin of the University of California at Santa Barbara and his colleagues may have detected primordial ripples at
angular scales of 1.5 degrees, though they are not yet convinced that they can rule out a galactic origin for their signal.
So we put these two ideas together, applying Asantha's mapping approach to new wavelengths, and decided that the best way to get at the extragalactic background was to measure spatial fluctuations
on angular scales around a degree.
But the new results from the Degree
Angular Scale Interferometer (DASI) and the Balloon Observations of Millimetric Extragalactic Radiation and Geophysics (BOOMERANG) project reveal two peaks and strongly suggest the presence of a third one.
This will allow EBEX to observe the primordial B - mode signal predicted by inflation on scales of about 0.5 deg and the anticipated lensing B - mode signal at
smaller angular scales.
Another experiment there, the South Pole Telescope, reported finding B - mode polarization last year, although the signal it saw was at a
different angular scale across the sky and was clearly due to the known process of gravitational lensing (a warping of light caused by massive objects) of the CMB by large galaxies, rather than the primordial gravitational waves seen here.
BICEP2 has plenty of competition in searching for B - mode polarization in the CMB: other projects include the Atacama B - mode Search (ABS) led by Princeton University; the POLARBEAR experiment led by the University of California, Berkeley; the high - altitude balloon — borne E and B Experiment (EBEX) run by the University of Minnesota; the Cosmology
Large Angular Scale Surveyor (CLASS) led by Johns Hopkins University; and numerous others.
By combining many different radio telescopes, very long baseline interferometry can allow astronomers to see
smaller angular scales and therefore image very distant objects that we wouldn't otherwise be able to see.
Knox and his colleagues are the first to combine data from four leading cosmic microwave background experiments, including the balloon - borne BOOMERANG mission and the
Degree Angular Scale Interferometer (DASI) telescope in Antarctica.
BICEP2 I: Detection of B - mode polarization at degree
angular scales.
A chance agreement of all three maps can not be ruled out entirely until the ripples are detected by other experiments covering a wider range of wavelengths and
angular scales.
data are notoriously noisy, and the purported effect looks remarkably like an instrumental glitch: it appears only in one small area of the sky and on
an angular scale close to the limit of the satellite's resolution.»
v «[The] data are notoriously noisy, and the purported effect looks remarkably like an instrumental glitch: it appears only in one small area of the sky and on
an angular scale close to the limit of the satellite's resolution.»
First aid was given by the image of M27 reproduced in Perek & Kohoutek's Catalogue of Galactic Planetary Nebulae, the only source at my disposal with clear orientation,
angular scale and coordinates of the stellar nucleus.
And
the angular scale of the EHT is astonishing; it will have the power to resolve something the size of a grape lying on the surface of the moon.
The SKA will be a radio observatory of unparalleled sensitivity across a wide range of
angular scales and radio wavelengths.
«The further the baselines [distance between observatories] are from one another, the smaller
the angular scale we get to see.»