Archive for extragalactic astronomy

A source of high-energy neutrinos!

Posted in The Universe and Stuff with tags , , , , on July 12, 2018 by telescoper

Before I go for a lie down here is a video that goes with the discovery of the first astrophysical source of high-energy neutrinos!

You can find the two Science papers relating to the discovery here and here. The first abstract reads:

Previous detections of individual astrophysical sources of neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neutrinos remain unidentified. On 22 September 2017, we detected a high-energy neutrino, IceCube-170922A, with an energy of ~290 TeV. Its arrival direction was consistent with the location of a known γ-ray blazar, TXS 0506+056, observed to be in a flaring state. An extensive multi-wavelength campaign followed, ranging from radio frequencies to γ-rays. These observations characterize the variability and energetics of the blazar and include the detection of TXS 0506+056 in very-high-energy γ-rays. This observation of a neutrino in spatial coincidence with a γ-ray–emitting blazar during an active phase suggests that blazars may be a source of high-energy neutrino.

The other abstract is:

A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted by this association, we investigated 9.5 years of IceCube neutrino observations to search for excess emission at the position of the blazar. We found an excess of high-energy neutrino events, with respect to atmospheric backgrounds, at that position between September 2014 and March 2015. Allowing for time-variable flux, this constitutes 3.5σ evidence for neutrino emission from the direction of TXS 0506+056, independent of and prior to the 2017 flaring episode. This suggests that blazars are identifiable sources of the high-energy astrophysical neutrino flux.

It’s all very cool!

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Three Astronomy Jobs at Sussex – The Deadline Approaches!

Posted in The Universe and Stuff with tags , , , on November 29, 2012 by telescoper

I’m taking the liberty of repeating this advertisement in case anybody out there missed it. Here is an announcement of three (new, permanent) jobs in Astronomy at the University of Sussex. You can also find an advertisment in the November AAS Jobs Register. In fact this is it. The deadline is 30th November, i.e. tomorrow, so if you want to apply then you had better get your skates on!

Full details of the positions are in the above links, but the gist is that applications are invited for 3 permanent, full-time faculty positions within the Astronomy Centre.

The 8 existing faculty have research interests that span the observation, modelling/simulation and theory of extragalactic astronomy and cosmology.  We are seeking talented and ambitious colleagues whose research interests complement and extend our current activity.

I’ll be interested to see how many people apply as a result of seeing this here announcement, so if you do fill in an application form  be sure to answer the question “Where did you see this post advertised” with “In the Dark”!

Three Astronomy Jobs at Sussex

Posted in The Universe and Stuff with tags , , , on October 18, 2012 by telescoper

Following hard on the heels of Tuesday’s news, here is an announcement of three (new, permanent) jobs in Astronomy at the University of Sussex. Full details are in the above link, but the gist is that applications are invited for 3 permanent, full-time faculty positions within the Astronomy Centre.

The 8 existing faculty have research interests that span the observation, modelling/simulation and theory of extragalactic astronomy and cosmology.  We are seeking talented and ambitious colleagues whose research interests complement and extend our current activity.

This advertisement will in due course appear elsewhere, e.g. in the November AAS Jobs Register.

I’ll be interested to see how many people apply as a result of seeing this here announcement, so if you do fill in an application form  be sure to answer the question “Where did you see this post advertised” with “In the Dark”!