Adaptive optics using multiple laser guide stars

There is a great article on the SPIE website by Christoph Baranec about the about new method to improve adaptive optics using multiple laser guide stars Adaptive optics work by canceling out the effects of air turbulence.

We have shown that the MMT’s laser-GLAO system reduces the atmosphere’s blurring effects over wide fields of view, demonstrating the reduction of stellar image widths by as much as 53% in the near-IR, and uniform correction over a 110 arcsecond field of view.

Check it out it is a good read.

1.5 Million Classified Galaxies

Galaxy Zoo 2As part of the 100 hours of Astronomy a project of the International Year of Astronomy the Galaxy Zoo decided to as there contributors to classify 1 million galaxies from the SDSS survey. As an active member I’m happy to say that after 100 hours of classifying we achieved 1.5 million classification. During this event Galaxy Zoo had reached the amazing total of 20 million galaxy classified. This amazing feat has been power by more than 150,000 people volunteers.

Coolly Extreme – Magnetars

Illustration of a Magnetar, Illustration: NASA/CXC/M.Weiss
Illustration of a Magnetar, Illustration: NASA/CXC/M.Weiss
At the AAS meeting in 2009 there was presentation by Denis Leahy who offered a possible explanation for the strong magnetic fields produced by an extreme object called a magnetar.  A magnetar is a type of neutron star that has a very fast rotation rate and are extremely magnetic.  These objects are born from the death of a star in a supernova and manage to preserve the magnetic field and angular momentum of the parent star.  So where do these strong magnetic fields come from?  According the Denis Leahy, they are caused by a theoretical star called a quark star.  These are neutron stars that are further compressed by gravity. These stars  “overwhelm the structure of the neutron degenerate matter, quark matter (or strange matter)”.   According to Leahy 1 in 10 supernova should result in a magnetar.

As with a lot of other astrophysics enthusiasts I love those things that are at the extremes of our fields of interest.  I’ve been following the evolution of magnetar research since I first read of them in Sky and Tel many, many moons ago.

For me magnetars rank right up there with black holes in there extreme coolness factor.  A quick search of produces 25 hits when the work magnetar is used and using the Digital Library for Physics and Astronomy produces over 200 hits.  Clearly a keen area of research.

source: Universe Today

Another current piece of research on magnetars is being conducted by astronomers from SRON Netherlands Institute for Space Research have used the NTEGRAL and XMM-Newton of ESA and the NASA satellite RXTE to discover that magnetars can produce very strong x-ray pulses.  This according to Peter den Hartog of the SRON in the Netherlands.  Magnetars are interesting because they’re stars about  1  1/2 the size of our sun, squeezed into a sphere 10 kilometres in diameter.  How they form exactly is a mystery.  Magnetars can emit enormous quantities of energy in the form of X-rays, they have a lifespan of only 10,000 years.

‘By converting the observations from INTEGRAL, XMM-Newton and RXTE into a type of short film, we could see how the characteristics of the X-rays changed over the course of time,’ explains Den Hartog. The characteristics of the radiation were found to drastically change during the rotation of the magnetar. Den Hartog: ‘Three different processes were found to be taking place in the magnetar that gave rise to three different pulses.’

source:  Science Centric

So You You Want To Use Hubble

Galaxy Zoo

I was reading Galaxy Zoo blog article “Getting Observing Time“. This is great insight into the inner working of our professional astronomers.   So what do you need to get granted time on one of the professional telescope.  Well Kevin Schawinski of the Galaxy Zoo team has posted a blog on the proposal process.

So the basics to get your proposal approved. Ask a specific question that fills avoid in the science or furthers existing work.  Make sure your proposal has “1) a science justification and 2) a technical justification.”  If either fails you get no time.  Oh and don’t, oh don’t ask for too much time.

Kevin has been a contributor to 20 articles on and active contributor to the Galaxy Zoo forums.