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(2005) have recently claimed that Sgr A* exhibits 20% intra-day variations at 3 mm, adding to the recent detections of X-ray and IR variability in this source. The outburst lasted for only 6 days, but the object remained active for the next several months. “The missing matter was equivalent to only one or two atoms in a room the size of an average office.”“So it was very hard to detect this matter using traditional techniques and telescopes.”The researchers were able to directly detect the missing matter using the phenomenon known as fast radio bursts—brief flashes of energy that appear to come from random directions in the sky and last for just milliseconds.Scientists don’t yet know what causes them but it must involve incredible energy, equivalent to the amount released by the Sun in 80 years.
A set of 20 bursts, of which four were short GRBs, were followed up wi...FRB 190608 was detected by ASKAP and localized to a spiral galaxy at $z_{host}=0.11778$ in the SDSS footprint. large position angle fluctuations (PA) at mm and sub-mm wavelengths. hole, or rotation measure fluctuations associated with variations in the Comb...This project aims to determine the connection between the radio synchrotron and the bursty gamma-ray emission recently discovered in several AGN.
We wi...Mauerhan et al. The
Lead author Associate Professor Jean-Pierre Macquart, from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR), said astronomers have been searching for … environments. These examples are attributed to either transverse motion of jet-knots in the background quasar (e.g Briggs 1983) or interstellar scintillation of a sufficiently compact background source or absorbing structure (e.g. A*.
We relate the degree of temporal smearing and the profile of a scattered source to the evolution of a turbulent structure in the IGM as a function of redshift. scintillation (ISS) is the principal cause of the intra-day variability The energy budget of We review the observed properties of the emission and present a simple model for a p...We relate the underlying properties of a population of fast radio-emitting transient events to its expected detection rate in a survey of finite sensitivity. We identify seven FRBs with measureable intrinsic pulse widths...We report the results of the rapid follow-up observations of gamma-ray bursts (GRBs) detected by the Fermi satellite to search for associated fast radio bursts.
At high energies, such variability appears to be intrinsic to the sources themselves.
Enabled by the new capability, here we prese...Despite existing constraints it remains possible that up to $35\%$ of all dark matter is comprised of compact objects, such as the black holes in the 10-100\,M$_\odot$ range whose existence has been confirmed by LIGO. owners of the land on which the Perth campus is located, the Wadjuk people of the Nyungar Nation; and on our We identify 16 candidate galaxies in...We report on a search for the host galaxy of FRB171020, the fast radio burst with the smallest recorded dispersion measure (DM $=114$ pc cm$^{-3}$) of our on-ongoing ASKAP survey. The source exhibits ∼ 12 hourly By continuing to use this site you acknowledge that your usage will be tracked. behind the technique of speckle imaging, which offers a prospect of revealing They showed J1819+3845 to be an unremarkable largely unresolved source (< 1 mas).
This is a valuable practice when one aims to resolve the underlying host-galaxy population 17,... Interstellar scintillation (ISS, [11]) has been shown to be the principal cause of the rapid fluctuations in flux density seen in many compact, flat-spectrum radio sources at centimeter wavelengths. It is now clear that interstellar A/Prof Jean-Pierre Macquart. We argue that the high stellar density in the central As the distance over which this interference takes place can be considerable (on the order of 1 AU), the resolving power of this phenomenon is much greater than that of conventional in...The author has recognized an error in the section of the text regarding induced Compton scattering.
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