“Our study shows that the luminosity declined until about 2001 owing to radioactive disintegration of compounds formed by the explosion. Over the last ten years, however, it began to shine more brightly again,” says Josefin Larsson at the Department of Astronomy.
Caption The images were captured in the red segment of the visible spectrum. However, the colours were added afterward and do not correspond to what we would see with our eyes. Different scales were used for the ring and the rest of the image to make details stand out more clearly. Stockholm university
“In the article we show that the increase is a result of x-ray radiation from the surrounding gas ring shining on the supernova. The change in the dominant energy source marks the transition from a supernova to what we call a supernova remnant.”
A supernova is the extremely bright explosion that occurs when a star of high density dies. The outer parts of the star are slung outward, while the innermost part forms a neutron star or a black hole. In the explosion, heavy elements are formed that subsequently come to be parts of new stars and planets.
”Supernova 1987A exploded in our neighbouring galaxy the Large Magellanic Cloud roughly 24 years ago. Since the supernova is so close, we have been able to study the consequences of the explosion with great precision for a long time with the aid of the Hubble Space Telescope,” says Larsson.
Images of Supernova 1987A taken with the Hubble Space Telescope between 1994 and 2009 show that what is shining in the middle are the remains of the star that exploded, while the ring consists of gas emitted from the star tens of thousands of years prior to the explosion. It can clearly be seen how the material that was sent out in the explosion is expanding and changing in luminosity over time.
The scientists from Stockholm University that took part in the project are Josefin Larsson, Claes Fransson, Göran Östlin, Per Gröningsson, Anders Jerkstrand, Cecilia Kozma, Jesper Sollerman, and Peter Lundqvist.
Viktor Sandqvist | idw
First Juno science results supported by University of Leicester's Jupiter 'forecast'
26.05.2017 | University of Leicester
Measured for the first time: Direction of light waves changed by quantum effect
24.05.2017 | Vienna University of Technology
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy