Browsing by Title

Now showing items 20547-20566 of 24106

    • Spectral age modelling of the 'Sausage' cluster radio relic 

      Stroe, A.; Harwood, Jeremy; Hardcastle, M.J.; Rottgering, H.J.A. (2014-12-01)
      CIZA J2242.8+5301 is a post-core passage, binary merging cluster that hosts a large, thin, arc-like radio relic, nicknamed the 'Sausage', tracing a relatively strong shock front. We perform spatially resolved spectral ...

    • Spectral ageing in the era of big data : Integrated versus resolved models 

      Harwood, Jeremy J. (2017-04-21)
      Continuous injection models of spectral ageing have long been used to determine the age of radio galaxies from their integrated spectrum; however, many questions about their reliability remain unanswered. With various large ...

    • Spectral ageing in the lobes of cluster-centre FR II radio galaxies 

      Harwood, Jeremy J.; Hardcastle, M.J.; Croston, J. H. (2015-12-21)
      Recent investigations have shown that many parameters and assumptions made in the application of spectral-ageing models to FR II radio galaxies (e.g. injection index, uniform magnetic field, non-negligible cross-lobe age ...

    • Spectral ageing in the lobes of FR-II radio galaxies : New methods of analysis for broad-band radio data 

      Harwood, J.J.; Hardcastle, M.J.; Croston, J.H.; Goodger, J.L. (2013-11-01)
      The broad-bandwidth capabilities of next generation telescopes such as the Jansky Very Large Array (JVLA) mean that the spectrum of any given source varies significantly within the bandwidth of any given observation. ...

    • Spectral Ageing in the Most Powerful Radio Galaxies 

      Mahatma, Vijay (2017-02-08)
      Radio-loud AGN represent the most energetic and influential large-scale structures in the Universe. Through physical processes such as AGN feedback, they are suggested to play a major role in the evolution of galaxies. ...

    • Spectral analysis of high resolution near-infrared spectra of ultra cool dwarfs 

      Lyubchik, Y.; Jones, H.R.A.; Pavlenko, Y.; Martin, E.L.; McLean, I.; Prato, L.; Barber, R.J.; Tennyson, J. (2007)

    • Spectral analysis of hot subluminous stars 

      Heber, U.; Edelmann, H.; Lemke, M.; Napiwotzki, R.; Engels, D. (Astronomical Society of the Pacific, 1999)
      Optical spectra of 40 sdOB stars drawn from the Palomar Green and the Hamburg-Schmidt surveys are presented (including three EC 14026 stars). Eight of which are spectroscopic binaries.

    • Spectral Analysis of sdB Stars from the Hamburg ESO Survey 

      Edelmann, H.; Heber, U.; Napiwotzki, R.; Lemke, M.; Christlieb, N. (2001)

    • Spectral analysis of sdB Stars from the Hamburg ESO Survey 

      Edelmann, H.; Heber, U.; Napiwotzki, R.; Lemke, M.; Christlieb, N. (Astronomical Society of the Pacific, 2001)
      We aim at the compilation of a statistically complete sample of sdB stars in the southern hemisphere. Candidates are selected from the database of digitized spectra of the Hamburg/ESO objective prism survey. First simulations ...

    • Spectral analysis of sdB Stars from the Hamburg Quasar Survey 

      Edelmann, H.; Heber, U.; Hagen, H.J.; Dreizler, S.; Napiwotzki, R.; Engels, D.; Lemke, M. (2003-03)

    • Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope 

      Bonnassieux, Etienne; Sweijen, Frits; Brienza, Marisa; Rajpurohit, Kamlesh; Riseley, Christopher John; Bonafede, Annalisa; Jackson, Neal; Morabito, Leah K.; Brunetti, Gianfranco; Harwood, Jeremy; Kappes, Alex; Rottgering, Huub J.; Tasse, Cyril; Weeren, Reinout van (2022-02-25)
      3C295 is a bright, compact steep spectrum source with a well-studied integrated radio spectral energy distribution (SED) from 132 MHz to 15 GHz. However, spatially resolved spectral studies have been limited due to a lack ...

    • Spectral analysis of the binary sdB star Feige 36 

      Edelmann, H.; Heber, U.; Napiwotzki, R.; Reid, I.N.; Saffer, R. (Astronomical Society of the Pacific, 1999)
      The sdB stars Feige 36 is a short-period, single-lined spectroscopic binary. Aymospheric parameters and abundances are determined from high-resolution Keck spectra. Feige 36 lies near the zero-age extreme Horizontal Branch ...

    • Spectral analysis of the DNA targeting bisalkylaminoanthraquinone DRAQ5 in intact living cells 

      Njoh, Kerenza L.; Patterson, Laurence H.; Zloh, Mire; Wiltshire, Marie; Fisher, Janet; Chappell, Sally; Ameer-Beg, Simon; Bai, Yanhong; Matthews, Daniel; Errington, Rachel J.; Smith, Paul J. (2006-08)
      We report on the potential DNA binding modes and spectral characteristics of the cell-permeant far red fluorescent DNA dye, DRAQ5, in solution and bound within intact cells. Our aim was to determine the constraints for its ...

    • Spectral analysis of water vapour in cool stars 

      Jones, H.R.A.; Pavlenko, Y.; Viti, S.; Tennyson, J. (2002-03)

    • Spectral and Photometric evolution of young stellar poplations: The impact of gaseous emission at various metallicites 

      Anders, P.; Fritze, U. (2003)

    • The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies 

      Brassington, Nicola; Fabbiano, G.; Zezas, A.; Kim, D.-W.; Fragos, T.; Kundu, A.; King, A.R.; Pellegrini, S.; Trinchieri, G.; Zepf, S.; Wright, N.J. (2012-08-20)
      We report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC3379, ...

    • Spectral classification of photometrically selected AGB candidates in NGC 6822 

      Sibbons, L. F.; Ryan, Sean G.; Napiwotzki, Ralf; Thompson, G. P. (2015-02-02)
      Context. The ratio of C- and M-type asymptotic giant branch (AGB) stars is commonly used to estimate the metallicity of extragalactic populations. Sources in the AGB population must therefore be accurately classified as ...

    • Spectral energy distribution and radio halo of NGC253 at low radio frequencies 

      Kapinska, A. D.; Staveley-Smith, L.; Crocker, R.; Meurer, G. R.; Bhandari, S.; Hurley-Walker, N.; Offringa, A. R.; Hanish, D. J.; Seymour, N.; Ekers, R. D.; Bell, M. E.; Callingham, J. R.; Dwarakanath, K. S.; For, B. -Q.; Gaensler, B. M.; Hancock, P. J.; Hindson, Luke; Johnston-Hollitt, M.; Lenc, E.; McKinley, B.; Morgan, J.; Procopio, P.; Wayth, R. B.; Wu, C.; Zheng, Q.; Barry, N.; Beardsley, A. P.; Bowman, J. D.; Briggs, F.; Carroll, P.; Dillon, J. S.; Ewall-Wice, A.; Feng, L.; Greenhill, L. J.; Hazelton, B. J.; Hewitt, J. N.; Jacobs, D. J.; Kim, H. -S.; Kittiwisit, P.; Line, J.; Loeb, A.; Mitchell, D. A.; Morales, M. F.; Neben, A. R.; Paul, S.; Pindor, B.; Pober, J. C.; Riding, J.; Sethi, S. K.; Shankar, N. Udaya; Subrahmanyan, R.; Sullivan, I. S.; Tegmark, M.; Thyagarajan, N.; Tingay, S. J.; Trott, C. M.; Webster, R. L.; Wyithe, S. B. (2017-03-27)
      We present new radio continuum observations of NGC253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC253 ...

    • Spectral energy distribution for GJ406 

      Pavlenko, Y.; Jones, H.R.A.; Lyubchik, Y.; Tennyson, J.; Pinfield, D.J. (2006)

    • The Spectral Energy Distribution of Powerful Starburst Galaxies I : Modelling the Radio Continuum 

      Galvin, T J; Seymour, N.; Marvil, J.; Filipovic, M D; Tothill, N.F.H.; McDermid, Richard M.; Hurley-Walker, N.; Hancock, P. J.; Callingham, J. R.; Cook, R H; Norris, Ray P.; Bell, M E; Dwarakanath, K. S.; For, B. -Q.; Gaensler, B. M.; Hindson, L; Johnston-Hollitt, M.; Kapińska, A. D.; Lenc, E.; McKinley, B.; Morgan, J; Offringa, A. R.; Procopio, P.; Staveley-Smith, L.; Wayth, R. B.; Wu, C.; Zheng, Q. (2018-02-01)
      We have acquired radio-continuum data between 70MHz and 48 GHz for a sample of 19 southern starburst galaxies at moderate redshifts (0.067 < z < 0.227) with the aim of separating synchrotron and free-free emission components. ...