| 1. |
- Acharya, B. S., et al.
(författare)
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Introducing the CTA concept
- 2013
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Ingår i: Astroparticle physics. - : Elsevier BV. - 0927-6505 .- 1873-2852. ; 43, s. 3-18
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project. (C) 2013 Elsevier B.V. All rights reserved.
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| 2. |
- Actis, M., et al.
(författare)
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Design concepts for the Cherenkov Telescope Array CTA : an advanced facility for ground-based high-energy gamma-ray astronomy
- 2011
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Ingår i: Experimental astronomy. - : Springer. - 0922-6435 .- 1572-9508. ; 32:3, s. 193-316
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Tidskriftsartikel (refereegranskat)abstract
- Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build the next generation instrument, with a factor of 5-10 improvement in sensitivity in the 100 GeV-10 TeV range and the extension to energies well below 100 GeV and above 100 TeV. CTA will consist of two arrays (one in the north, one in the south) for full sky coverage and will be operated as open observatory. The design of CTA is based on currently available technology. This document reports on the status and presents the major design concepts of CTA.
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| 3. |
- Arnadottir, Anna, et al.
(författare)
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Exoplaneter : kretsande runt avlägsna stjärnor
- 2011
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Konstnärligt arbete (övrigt vetenskapligt/konstnärligt)abstract
- Orbiting our star, the Sun, there are eight planets and several dwarf planets. Astronomers have now discovered planets orbiting several nearby stars in our galaxy, the Milky Way. In this planetarium show we look up into the starry night sky, familiarize ourselves with the stars and the constellations, and together we discover the exoplanets out there and how they can be detected.
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| 4. |
- Arnadottir, Anna, et al.
(författare)
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The Meridian S02E04 : The European Southern Observatory & an eathquake on the mountain
- 2022
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Konstnärligt arbete (övrigt vetenskapligt/konstnärligt)abstract
- The European Southern Observatory, or ESO, is celebrating 60 years of scientific achievements in the southern hemisphere. Sweden is one of the founding members of ESO, and several astronomers from Lund have been actively involved over the years. In the fourth episode of the second season our podcast hosts, Nic Borsato and Rebecca Forsberg, invite professor emeritus Dainis Dravins to the microphone to tell us about both the Swedish and his own connection to the European Southern Observatory. In this second season of the Meridian we are also bringing you some field reporting from the Nordic Optical Telescope on La Palma, where a team of astronomers are trying to catch an ultra-hot Jupiter-sized exoplanet.
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| 5. |
- Barbieri, C., et al.
(författare)
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Astronomical applications of quantum optics for extremely large telescopes
- 2007
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Ingår i: Journal of Modern Optics. - 0950-0340. ; 54:2-3, s. 191-197
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Tidskriftsartikel (refereegranskat)abstract
- A programme has been started to investigate photon properties that are not currently exploited in astronomical instruments, namely second- and higher-order coherence functions encoded in their arrival time, and the orbital angular momentum. This paper expounds the first results achieved in the study of a novel astronomical photometer capable of pushing time tagging towards the picosecond region. This conceptual device has been developed as a possible focal plane instrument for the future OverWhelmingly Large Telescope (OWL) of the European Southern Observatory. This instrument has been named QuantEYE, that is, the Quantum Eye of OWL.
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| 6. |
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| 7. |
- Björn, Lars Olof, et al.
(författare)
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Detectability of life and photosynthesis on exoplanets.
- 2009
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Ingår i: Current Science. - 0011-3891. ; 96:9, s. 1171-1175
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- ‘Is there life on exoplanets?’. We refer to exoplanets as planets in other solar systems than our own. This often asked question can be further refined by asking ‘is there life on exoplanets which is so extensive that it may impact on its atmosphere, its biosphere and its optical properties?’. And if such a life exists, at astronomical distances from us, can we detect it with instruments on Earth-based or Earth-orbiting observatories? Will then, in that case, our advanced knowledge of present-day and early-day photosynthesis on Earth help us select appropriate biosignatures that may signal its presence? Here we elaborate further on these themes, based on the most recent literature, and from the point of view of photosynthesis. We also provide our considered views. Although search for chlorophyll is considered desirable, we conclude that our best bet is to look for and analyse photosynthesis-related gases, namely O2, CO2 and H2O vapour. We shall keep in mind that the evolutionary tree of life on our planet has its roots in autotrophy, and of the various forms of autotrophy, only oxygenic
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| 8. |
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| 9. |
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| 10. |
- Dravins, Dainis, et al.
(författare)
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Absolute wavelength shifts - A new diagnostic for rapidly rotating stars
- 2004
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Ingår i: Stellar Rotation; IAU Symposium. - 0074-1809. ; :215, s. 27-32
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Konferensbidrag (refereegranskat)abstract
- Accuracies reached in space astrometry now permit. the accurate determination of astrometric radial velocities. without any use of spectroscopy. Knowing this true stellar motion, spectral shifts; intrinsic to stellar atmospheres can be identified, for instance gravitational redshifts and those caused by, velocity fields on stellar surfaces. The astrometric accuracy is independent. of any spectral complexity, such as the smeared-out line profiles of rapidly rotating stars. Besides a better determination of stellar velocities, this permits more precise studies of atmospheric dynamics, such as possible modifications of stellar surface convection (granulation) by rotation-induced forces, as well as a potential for observing meridional flows across stellar surfaces.
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