The accreting millisecond X-ray pulsar (AMXP) SAX J1808.4-3658, shows a peculiar orbital evolution that proceeds at a much faster pace than predicted by conservative binary evolution models. It is important to identify the underlying mechanism responsible for this behavior because it can help to understand how this system evolves. It has also been suggested that,... Continue Reading →
Welcome to Pluto.
The WordPress.com stats helper monkeys prepared a 2014 annual report for this blog. Here's an excerpt: The concert hall at the Sydney Opera House holds 2,700 people. This blog was viewed about 38,000 times in 2014. If it were a concert at Sydney Opera House, it would take about 14 sold-out performances for that many... Continue Reading →
The Millisecond Pulsar Catalogue has been updated: 65 pulsar ephemeris updated, 3 new pulsar added. Total pulsars: 353.
The Millisecond Pulsar Catalogue has been updated: 65 pulsar ephemeris updated, 1 new pulsar added. Total pulsars: 350 (NOTE: 351--> 350 as one pulsar was redundant).
Unfortunately the claimed gamma-ray-burst/Ultra-luminous X-ray source in M31 is not real: http://gcn.gsfc.nasa.gov/gcn3/16336.gcn3
Accreting Millisecond X-Ray Pulsars are amazing objects (see also my research page in the section "Accreting Millisecond X-ray pulsars"). They are neutron stars that orbit around a relatively small star like our Sun and eat gas from the stellar outer layers ripping them off with their strong gravitational pull. These accreting pulsars rotate several hundred... Continue Reading →
We know that black holes exist in Nature with at least two different sizes: super-massive black holes, that live in the centre of galaxies and stellar-mass black holes. The origin and evolution of these two types of black holes are very different. The millions of stellar mass black holes that populate our galaxy are mostly... Continue Reading →
Neutron stars are few kilometres sized objects that come to life when a massive star dies in a devastating supernova explosion. A few months ago a very peculiar neutron star has been discovered in an even more peculiar location of our Galaxy. A magnetar is neutron star surrounded by a magnetic field so intense that... Continue Reading →