2 edition of The BL lac phenomenon found in the catalog.
The BL lac phenomenon
by National Aeronautics and Space Administration, Goddard Space Flight Center, For sale by the National Technical Information Service in [Greenbelt, Md, Springfield, Va
Written in English
|Other titles||Determination of the x-ray spectrum of a complete sample of flat-spectrum radio sources.|
|Statement||D.M. Worrall ... [et al.].|
|Series||NASA CR -- 195951., NASA contractor report -- NASA CR-195951.|
|Contributions||Worrall, Diana M., Goddard Space Flight Center.|
|The Physical Object|
BL Lacertae object has been listed as a level-5 vital article in Science, Astronomy. If you can improve it, please do. This article has been rated as Start-Class. Astrophysics > High Energy Astrophysical Phenomena. arXiv (astro-ph) [Submitted on 23 May ] Title: Gamma-ray counterparts of 2WHSP high-synchrotron-peaked BL Lac objects as possible signatures of ultra-high-energy cosmic-ray emission. Authors: Michael W. Toomey, Foteini Oikonomou, Kohta Murase.
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If you're researching the social sciences you'll find a wealth of useful resources at the British Library. Our collections cover politics, economics, law, sociology, linguistics and many other subjects. We have a wide range of materials including official publications, legal documents, business literature, journals and . But BL Lac objects can change their light output in days, sometimes hours. This implies that the light we see comes from a source only light-hours across. This might be large compared to the Solar System which is six light-hours in radius, but since the distance to the nearest star is over 4 light-YEARS.
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The BL lac phenomenon: x-ray observations of transition objects ; Determination of the x-ray spectrum of a complete sample of flat -pectrum radio sources Author: Diana M Worrall ; Goddard Space Flight Center.
Multiband Approach to AGN, Bonn On the Origin of the BL Lac Phenomenon Dominant paradigm Commonly attributed to conference paper by Blandford & Rees (). BL Lacs are viewed close to axis of a relativistic jet.
Jet emission is strongly beamed, and swamps any emission line radiation. The BL LAC phenomenon: X-ray observations of transition objects and determination of the x-ray spectrum of a complete sample of flat-spectrum radio sources. By Diana M. Worrall. : Diana M. Worrall. For the BL Lac phenomenon the merging area seems to form the progenitor, while the Seyfert II phenomenon could be triggered by merging events.
The role of star burst activity in terms of activity. BL Lac is a blazar, the most energetic type of black-hole-powered galactic core. A black hole is a concentration of mass so dense that not even light can escape its gravitational pull.
Supermassive black holes - about million times the mass of our Sun in the case of BL Lac - in these galaxies' cores power jets of electrically charged The BL lac phenomenon book and intense radiation.
based 6 cm \cores" of BL Lac objects is typically domi-nated by the contribution of relatively highly polarised optically thin emission in the inner jet, as proposed by Gabuzda et al. (), with the core itself being much moremodestlypolarisedthanindicatedbygroundobser-vations,m’1¡3%(Gabuzda,Gabuzda&Gomez a,b).
A BL Lacertae object or BL Lac object is a type of active galactic nucleus (AGN) or a galaxy with such an AGN, named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization.
1 A simplified view of blazars: why BL Lacertae is actually a quasar in disguise* Paolo Padovani, ESO, Germany P. Giommi, G. Polenta, S. Turriziani, V. DʼElia (ASDC), S. Piranomonte (INAF). All BL Lac objects (except one) have at least 2 companions, some of which are bright, within a projected distance of 60 kpc from the BL Lac.
In two cases we found 5 companions within 50 kpc. This volume gives a comprehensible survey of BL Lac objects: contributors summarize observations on these interesting astrophysical objects and present theoretical models to explain them.
Understanding these objects should help to give a better insight into the physics of black holes and relativistic plasmas. BL Lac phenomenon: Proceedings of a meeting held at Turku, Finland, June (Astronomical Society of the Pacific conference series) Jan 1, Hardcover.
It has become clear in recent years that relativistic beaming is a good explanation for the BL Lac phenomenon. Of studies based on the relativistic beaming model of BL Lac objects, we note that the orientation of jet's axis to the line-of-sight is very small and, therefore, the observed flux emitted from a rapidly moving source is orders of magnitude higher than the flux in its rest-frame:F.
Radio and gamma-ray emissions in Active Galactic Nuclei (AGNs) are both related to the presence of relativistic particles in jets.
With the advent of the Fermi Large Area Telescope (LAT), and thanks to its large sensitivity up to several GeV, many observational results are changing our understanding of these phenomena. BL Lac objects, which made up only a fraction of the known extragalactic.
Abstract: High energy observations of extreme BL Lac objects, such as 1ES + or 1ESrecently focused interest both for blazar and jet physics and for the implication on the extragalactic background light and intergalactic magnetic field estimate.
However, the number of these extreme highly peaked BL Lac objects (EHBL) is still rather small. As part of our optical spectroscopic study of radio galaxies in Abell clusters, we report a search for BL Lac phenomena in our sample. As an indicator of possible nonthermal activity in the nuclei of our radio galaxies, we report D(), a measure of the A break, for objects.
None of the objects in our sample are found which meet the tions for BL Lac objects both for D() and for. As far as we are aware, our observations of the BL Lac object − (z=) are the first 5 GHz VLBI observations of this our I image, we detected a very straight jet to the northwest, direction θ=−75°, resolved into four jet components (Fig.
1a). The linear polarisation map (Fig. 1b) shows a double structure, where one of polarisation components is related to the core and. BL Lac was one of only two known (non-cepheid) extragalactic variable stars at the time. This was not the end to BL Lac's 15 minutes of fame, however.
Quasar research took off in the 70's and soon other quasars were classified as "BL Lac objects" and eventually they all. The concept that I was so invested in definitely carries a strong first half of a book that leads to what feels like a rushed, uninstersting and at times incoherent second half.
I wouldn't personally recommend it but try out the Phenomenon podcast and if that catches you like it caught me, it could be worth checking out the source materialReviews: Get this from a library. BL Lac phenomenon: proceedings of a meeting held at Turku, Finland, June [Leo O Takalo; Aimo Sillanpää;].
The continuity of properties among different classes of sources and the systematic trends of the SEDs as a function of luminosity favour a unified view of the blazar phenomenon: a single parameter, related to luminosity, seems to govern the physical properties and radiation mechanisms in the relativistic jets present in BL Lac objects as well.We present a search for gravitationally-lensed BL Lacs with deep, high-resolution, two-frequency VLA radio maps of seven lensing candidates from the 1 Jansky BL Lac sample.
We find that none of these objects are resolved into an Einstein ring like B +, nor do any show multiple images of the core.Search the world's most comprehensive index of full-text books. My library.