Wednesday, 19 January 2011

Lots of cool stuff

after a long break I'm back with no less than 5 new articles about what can arguably be described as my favourite spacecraft, Planck!! the stories cover a bunch of really cool results that have been achieved from its early data and presented at a conference in Paris last week, spanning a wide range of astronomical objects that will suit everyone's palate — from tiny dust grains in our Galaxy all the way to the huge galaxy clusters and the distribution of galaxies on the largest scales. enjoy :)

Planck's first science results and the release of an extensive compact source catalogue
The Planck Collaboration presents the first science results to emerge from the mission, covering compact and diffuse foreground emission sources, at a conference held from 10 to 14 January 2011 in Paris, France. These results are accompanied by the release of the first Planck product to be publicly distributed: the Early Release Compact Source Catalogue, a highly robust compilation of compact sources detected in each of the telescope's nine channels. Eagerly awaited by the scientific community, the catalogue contents span a wide variety of astronomical sources, and also includes a sample of galaxy clusters detected through the Sunyaev-Zel'dovich effect and a list of cold molecular cloud cores distributed throughout the Milky Way. More...

Planck's successful hunt probes galaxy clusters on very broad mass range
The first all-sky survey of galaxy clusters detected via the Sunyaev-Zel'dovich effect is amongst the highlights presented by the Planck Collaboration at a conference held from 10 to 14 January 2011 in Paris, France. The survey, which has benefited from a fruitful collaboration with ESA's XMM-Newton observatory, probes a wide range of cluster masses and other properties, which is unprecedented for a Sunyaev-Zel'dovich sample. Along with the first results enabled by the survey, the Early Sunyaev-Zel'dovich Cluster sample is being publicly released, providing the community with a robust data set for further studies and follow-up observations of galaxy clusters. More...

Planck traces the coldest objects in the nearby Universe
With its power to detect cosmic material at unprecedentedly low temperatures, Planck has completed the first unbiased, all-sky survey of compact cold and dusty objects in the Milky Way and, at the same time, the first all-sky survey of cool dust in other galaxies. These extensive data sets allow astronomers to shed new light on the earliest phases of star formation. The public release of the Planck Early Cold Core Catalogue will offer the community a large number of new, cold galactic targets to be studied with other telescopes, including ESA's Herschel Space Observatory. More...

Planck sees new, mysterious components in Milky Way and Magellanic Clouds
Thanks to its broad spectral coverage and very high sensitivity, Planck is peering deep into the interstellar medium of the Milky Way and discovering new components and physical mechanisms taking place therein. The results emerging from Planck's first all-sky survey include strong evidence for the presence of extremely rapidly spinning dust grains, an excess emission explained in terms of a previously poorly quantified 'dark gas' and the characterisation of an excess emission arising from the interstellar medium that permeates the Small Magellanic Cloud, a nearby galaxy orbiting our own Milky Way. More...

Planck sees traces of early structure formation in the cosmic infrared background
While targeting the Cosmic Microwave Background, Planck has also captured another important diffuse radiation, the Cosmic Infrared Background, which consists of the light emitted by all galaxies since their formation. This signal, detected by Planck at submillimetre wavelengths, exhibits a high degree of structure and enables astronomers to investigate the still unclear link between star-forming galaxies and the underlying distribution of dark matter, up to the earliest phases of the formation of cosmic structure. More...

Image credits: ESA and the Planck Collaboration

Friday, 3 December 2010

Just like archaeologists

here's a new article about astronomical measurements of radioactive elements in some stars that remind us of the way archaeologists date their samples. apparently, a highly appreciated comparison!! enjoy :-)

INTEGRAL helps unravel the tumultuous recent history of the solar neighbourhood

Just like archaeologists, who rely on radioactive carbon to date the organic remains from past epochs, astronomers have exploited the radioactive decay of an isotope of aluminium to estimate the age of stars in the nearby Scorpius-Centaurus association, the closest group of young and massive stars to the Sun. The new observations, performed in gamma rays by ESA's INTEGRAL observatory, provide evidence for recent ejections of matter from massive stars that took place only a few million years ago in our cosmic neighbourhood. More...

Image credits: ESA

Friday, 19 November 2010

Hot gas fountains and the galactic spa

here's a new article that came out today about new data confirming a mechanism where hot gas bursts out of the Milky Way's disc and into the galactic halo, giving rise to so-called galactic fountains:

New evidence for supernova-driven galactic fountains in the Milky Way

Observing the X-ray-bright gas in the halo of the Milky Way, ESA's XMM-Newton has gathered new data which favour a process involving fountains of hot gas in our Galaxy. Such a scenario, with the gas flowing from the galactic disc into the halo where it then condenses into cooler clouds and subsequently falls back to the disc, confirms the importance of supernova explosions in forging the evolution of the interstellar medium and of the entire Galaxy. More...

Image credits: ESA

Thursday, 4 November 2010

lenses in the sky – without diamonds

and finally a new story about cosmology and a good old friend of yours truly, i.e. gravitational lensing... yay!

New method reveals gravitationally lensed galaxies in Herschel-ATLAS first survey

Astronomers using early data from one of the largest projects to be undertaken with the ESA Herschel Space Observatory have demonstrated that virtually all bright sub-millimetre galaxies in the distant Universe are subject to gravitational lensing, which amplifies their flux thus easing their detection and characterisation. Analysis of less than three per cent of the entire Herschel-ATLAS survey, which probes the distant and hidden Universe, yielded a first sample of five lensed galaxies and paves the way for the compilation, in the near future, of a rich catalogue of distant, star-forming and dust-obscured galaxies. More...

Image credits: ESA/NASA/JPL-Caltech/Keck/SMA

Thursday, 14 October 2010

hidden magnetism

lots of new stories these days – yay!
this one's about a really curious object... enjoy :-)

Are most pulsars really magnetars in disguise?

Astronomers using XMM-Newton and other world-class X-ray telescopes have probed a curious source, which emits flares and bursts just like a magnetar but lacks the extremely high external magnetic field typical of these objects. The detection of this source, which could be powered by a strong, internal magnetic field hidden to observations, may mean that many 'ordinary' pulsars are dormant magnetars waiting to erupt. More...

Image credits: ESA

Wednesday, 13 October 2010

you rock — you rule!

here's a new story about rocks, I mean, asteroids :-)

Hubble and Rosetta unmask nature of recent asteroid wreck

High-resolution images from the Hubble Space Telescope and a rare view obtained, from a unique perspective, by the Rosetta spacecraft provide a comprehensive picture of P/2010 A2, a puzzling body in the asteroid main belt. Although similar in appearance to a comet, this object and its diffuse trail have been exposed as the remnant of an asteroid crash that happened only one and a half years ago. More...

Image credits: ESA – OSIRIS-Team; MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA

Thursday, 7 October 2010

Venus' draggin' and twistin' atmosphere

here's a new story I wrote in the last couple of days for ESA about some cool experiments to study the atmosphere of our sister planet Venus:

Venus Express probes the planet's atmosphere by flying through it

ESA's Venus Express is exploring the density of the Venusian upper atmosphere by measuring how much the planet's atmosphere itself slows down or twists the pointing of the spacecraft. New density measurements, centred on the Northern Pole and obtained during these atmospheric drag experiments, show an unexpected inhomogeneous pattern in the atmosphere of our neighbouring planet. More...

Image credit: ESA