NASA’s Swift satellite makes best-ever ultraviolet portrait of Andromeda galaxy

Washington, September 17 (ANI): NASA’s Swift satellite has acquired the highest-resolution view of a neighboring spiral galaxy ever attained in the ultraviolet.

The galaxy, known as M31 in the constellation Andromeda, is the largest and closest spiral galaxy to our own.

“Swift reveals about 20,000 ultraviolet sources in M31, especially hot, young stars and dense star clusters,” said Stefan Immler, a research scientist on the Swift team at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

“Of particular importance is that we have covered the galaxy in three ultraviolet filters. That will let us study M31′s star-formation processes in much greater detail than previously possible,” he added.

M31, also known as the Andromeda Galaxy, is more than 220,000 light-years across and lies 2.5 million light-years away.

On a clear, dark night, the galaxy is faintly visible as a misty patch to the naked eye.

Between May 25 and July 26, 2008, Swift’s Ultraviolet/Optical Telescope (UVOT) acquired 330 images of M31 at wavelengths of 192.8, 224.6, and 260 nanometers.

The images represent a total exposure time of 24 hours.

The task of assembling the resulting 85 gigabytes of images fell to Erin Grand, an undergraduate student at the University of Maryland at College Park who worked with Immler as an intern this summer.

“After ten weeks of processing that immense amount of data, I’m extremely proud of this new view of M31,” she said.

Several features are immediately apparent in the new mosaic.

The first is the striking difference between the galaxy’s central bulge and its spiral arms.

“The bulge is smoother and redder because it’s full of older and cooler stars,” Immler explained. “Very few new stars form here because most of the materials needed to make them have been depleted,” he added.

Dense clusters of hot, young, blue stars sparkle beyond the central bulge.

M31′s disk and spiral arms contain most of the gas and dust needed to produce new generations of stars.

Star clusters are especially plentiful in an enormous ring about 150,000 light-years across.

“Swift is surveying nearby galaxies like M31 so astronomers can better understand star- formation conditions and relate them to conditions in the distant galaxies where we see gamma-ray bursts occurring,” said Neil Gehrels, the mission’s principal investigator at NASA Goddard. (ANI)

India-Pakistan ties vulnerable to Mumbai type attacks: US analysts

Washington, April 14 (IANS) Indian and Pakistani governments’ means of detecting, preventing and responding to Mumbai type incidents needs to be strengthened to reduce the vulnerability of their relations to them, two US analysts have suggested.

The Nov 26-29 terror attacks blamed on Pakistan based terror outfit Lashkar-e-Taiba (LeT) ushered in a period of high tension between India and Pakistan, noted Teresita C. Schaffer and Sabala Baskar.

Schaffer is director of the South Asia Programme at the Centre for Strategic and International Studies (CSIS), a Washington think tank, while Baskar is a research intern there.

Mumbai attacks also sparked the beginnings of an effort to reform India’s internal security response, and may have opened a door to expanded cooperation between the US and India against terrorism.

But, more importantly, the attacks underscored how vulnerable India-Pakistan relations are to incidents of this sort, especially when governments are weak or elections loom, Schaffer and Baskar said.

‘After the Mumbai attacks, caution prevailed during India’s internal deliberations. However, analysts were convinced that another attack of this sort might push India’s political leaders to a more forceful’ and potentially more dangerous ‘response’, the duo said.

‘This possibility reflects the need for a democratic government, especially one facing elections, to show that it can defend its country,’ they said, suggesting ‘the argument that a stable Pakistan serves India’s interest has little political resonance within the country’.

While details of the forensic cooperation between India and the US have not been released, it is clear that US officials were impressed and sobered by what they found, and that the US conveyed this clearly to Pakistan.

This appears to have been a factor in facilitating a relatively constructive Pakistani response.

The 2008 Mumbai episode contrasts with several previous terrorist incidents in which US-India cooperation was clearly hamstrung by US inability to straightforwardly deal with the problem of actual or potential Pakistani involvement.

This may open the door to stronger anti-terrorism cooperation between Delhi and Washington, an important potential addition to the relationship the two countries have been developing, the two researchers said.

But the Mumbai attacks also demonstrated how quickly a seemingly stable India-Pakistan environment can deteriorate.

‘Besides the familiar arguments for political leadership and persistent diplomacy between India and Pakistan, one factor in reducing this vulnerability is strengthening both governments’ means of detecting, preventing, and responding to such incidents,’ Schaffer and Baskar suggested.