Browsing by Author "Centre for Astrophysics Research (CAR)"

Now showing items 161-180 of 3233

    • Aperture Synthesis Spectral Line Imaging: Exploring the Third Dimension (Invited Talk) 

      Brinks, E.; Walter, F. (Astronomical Society of the Pacific, 2002)
      Radio astronomers are in a privileged position as compared to optical and near-IR observers because almost from the beginning of radioastronomical observations it proved possible to obtain spectral information at velocity ...

    • APOGEE strings: a fossil record of the gas kinematic structure 

      Hacar, A.; Alves, J.; Forbrich, J.; Meingast, S.; Kubiak, K.; Grossschedl, J. (2016-05-01)
      We compare APOGEE radial velocities (RVs) of young stars in the Orion A cloud with CO line gas emission and find a correlation between the two at large-scales, in agreement with previous studies. However, at smaller scales ...

    • The appearance of broad H alpha in BL Lacertae 

      Corbett, E.A.; Robinson, A.; Axon, D.J.; Hough, J.; Jeffries, R.D.; Thurston, M.R.; Young, S. (1996)
      We present optical spectropolarimetry confirming Vermeulen et al.'s recent discovery of a broad Hα emission line in BL Lacertae. This feature, which is present at about the same strength in spectra taken two days apart, ...

    • Applicability of the Hauser-Feshbach approach for the determination of astrophysical reaction rates 

      Rauscher, T.; Thielemann, Friedrich-Karl; Kratz, K.L. (1997-08-04)
      Nuclear Astrophysics requires the knowledge of reaction rates over a wide range of nuclei and temperatures. In recent calculations the nuclear level density – as an important ingredient to the statistical model (Hauser-Feshbach) ...

    • Application of Bayesian model inadequacy criterion for multiple data sets to radial velocity models of exoplanet systems 

      Tuomi, M.; Pinfield, D.J.; Jones, H.R.A. (2011-08)
      We present a simple mathematical criterion for determining whether a given statistical model does not describe several independent sets of measurements, or data modes, adequately. We derive this criterion for two data sets ...

    • The Application of Ridgelines in Extended Radio Source Cross-Identification 

      Barkus, B.; Croston, J. H.; Piotrowska, J.; Mingo, B.; Best, P. N.; Hardcastle, M. J.; Mostert, R. I. J.; Röttgering, H. J. A.; Sabater, J.; Webster, B.; Williams, W. L. (2021-10-22)
      Extended radio sources are an important minority population in modern deep radio surveys, because they enable detailed investigation of the physics governing radio-emitting regions such as active galaxies and their ...

    • Approaching the Gamow Window with Stored Ions : Direct Measurement of Xe 124 (p,γ) in the ESR Storage Ring 

      Glorius, J.; Langer, C.; Slavkovská, Z.; Bott, L.; Brandau, C.; Brückner, B.; Blaum, K.; Chen, X.; Dababneh, S.; Davinson, T.; Erbacher, P.; Fiebiger, S.; Gaßner, T.; Göbel, K.; Groothuis, M.; Gumberidze, A.; Gyürky, G.; Heil, M.; Hess, R.; Hensch, R.; Hillmann, P.; Hillenbrand, P. M.; Hinrichs, O.; Jurado, B.; Kausch, T.; Khodaparast, A.; Kisselbach, T.; Klapper, N.; Kozhuharov, C.; Kurtulgil, D.; Lane, G.; Lederer-Woods, C.; Lestinsky, M.; Litvinov, S.; Litvinov, Yu A.; Löher, B.; Nolden, F.; Petridis, N.; Popp, U.; Rauscher, T.; Reed, M.; Reifarth, R.; Sanjari, M. S.; Savran, D.; Simon, H.; Spillmann, U.; Steck, M.; Stöhlker, T.; Stumm, J.; Surzhykov, A.; Szücs, T.; Nguyen, T. T.; Taremi Zadeh, A.; Thomas, B.; Torilov, S. Yu; Törnqvist, H.; Träger, M.; Trageser, C.; Trotsenko, S.; Varga, L.; Volknandt, M.; Weick, H.; Weigand, M.; Wolf, C.; Woods, P. J.; Xing, Y. M. (2019-03-07)
      We report the first measurement of low-energy proton-capture cross sections of Xe124 in a heavy-ion storage ring. Xe12454+ ions of five different beam energies between 5.5 and 8 AMeV were stored to collide with a windowless ...

    • An approximation for the rp-process 

      Rembges, F.; Freiburghaus, C.; Rauscher, T.; Thielemann, F.K.; Schatz, H.; Wiescher, M. (1997-07-20)
      Hot (explosive) hydrogen burning, or the rapid proton capture process (rp-process), occurs in a number of astrophysical environments. Novae and X-ray bursts are the most prominent ones, but accretion disks around black ...

    • The Aquila comparison project : the effects of feedback and numerical methods on simulations of galaxy formation. 

      Scannapieco, C.; Wadepuhl, M.; Parry, O. H.; Navarro, J. F.; Jenkins, A.; Springel, V.; Teyssier, R.; Carlson, E.; Couchman, H. M. P.; Crain, R. A.; Dalla Vecchia, C.; Frenk, C. S.; Kobayashi, C.; Monaco, P.; Murante, G.; Okamoto, T.; Quinn, T.; Schaye, J.; Stinson, G. S.; Theuns, T.; Wadsley, J.; White, S. D. M.; Woods, R. (2012-06)
      We compare the results of various cosmological gas-dynamical codes used to simulate the formation of a galaxy in the ? cold dark matter structure formation paradigm. The various runs (13 in total) differ in their numerical ...

    • Are Odd Radio Circles phoenixes of powerful radio galaxies? 

      Shabala, Stanislav; Yates-Jones, Patrick; Jerrim, Larissa; Turner, Ross; Krause, Martin; Norris, Ray; Koribalski, Baerbel; Filipovic, Miroslav; Rudnick, Larry; Power, Chris; Crocker, Roland (2024-03-05)
      Odd Radio Circles (ORCs) are a class of low surface brightness, circular objects approximately one arcminute in diameter. ORCs were recently discovered in the Australian Square Kilometre Array Pathfinder (ASKAP) data, and ...

    • Are the kinematics of DLAs in agreement with their arising in the gas disks of galaxies? 

      Zwaan, M.; Walter, F.; Ryan-Weber, E.; Brinks, E.; de Blok, W.J.G.; Kennicutt, R.C. (2008)
      We demonstrate in this paper that the velocity widths of the neutral gas in damped Lyα (DLA) systems are inconsistent with these systems originating in gas disks of galaxies, similar to those seen in the local universe. ...

    • Are there any first-generation stars in globular clusters today? 

      Charbonnel, C.; Chantereau, W.; Krause, M.; Primas, F.; Wang, Y. (2014-09-22)
      Context. Several models compete to explain the abundance properties of stellar populations in globular clusters. One of the main constraints is the present-day ratio of first- and second-generation stars that are currently ...

    • The Arecibo Galaxy Environment Survey (AGES) : XI. The expanded Abell 1367 field: Data catalogue and Hi census over the surveyed volume 

      Deshev, Boris; Taylor, Rhys; Minchin, Robert; Scott, Thomas; Brinks, Elias (2022-09-23)
      Context. Many galaxy properties are known to correlate with the environment in which the galaxies are embedded. Their cold, neutral gas content, which is usually assessed through 21 cm H I observations, is related to many ...

    • The Arecibo Galaxy Environment Survey: precursor observations of the NGC 628 group 

      Auld, R.; Minchin, R.F.; Davies, J.; Catinella, B.; van Driel, W.; Henning, P.A.; Linder, S.; Momjian, E.; Muller, E.; O'Neil, K.; Sabatini, S.; Schneider, S.; Bothun, G.; Cortese, L.; Disney, M.; Hoffman, G.L.; Putman, M.; Rosenberg, J.L.; Baes, M.; de Blok, W.J.G.; Boselli, A.; Brinks, E.; Brosch, N.; Irwin, M.J.; Karachentsev, I.D.; Kilborn, V.A.; Koribalski, B.; Spekkens, K. (2006)

    • Assembling a high-precision abundance catalogue of solar twins in GALAH for phylogenetic studies 

      Walsen, Kurt; Jofré, Paula; Buder, Sven; Yaxley, Keaghan; Das, Payel; Yates, Robert M; Hua, Xia; Signor, Theosamuele; Eldridge, Camilla; Rojas-Arriagada, Alvaro; Tissera, Patricia B; Johnston, Evelyn; Aguilera-Gómez, Claudia; Zoccali, Manuela; Gilmore, Gerry; Foley, Robert (2024-04-15)
      Stellar chemical abundances have proved themselves a key source of information for understanding the evolution of the Milky Way, and the scale of major stellar surveys such as GALAH have massively increased the amount of ...

    • Assessing the stellar population and the environment of an HII region on the far side of the Galaxy 

      Chené, A. -N.; Benjamin, R. A.; Alegría, S. Ramírez; Borissova, J.; Kurtev, R.; Bidin, C. Moni; Mauro, F.; Lucas, P.; Guo, Z.; Smith, L. C.; Gonzalez-Fernandez, C.; Ivanov, V. D.; Minniti, D.; Anderson, L. D.; Armentrout, W. P.; Gonzalez, D.; Herrero, A.; Ramírez, K. Peña (2021-04-20)
      We have investigated the stellar and interstellar content of the distant star formation region IRAS 17591-2228 (WISE HII region GAL 007.47+0.06). It is associated to a water maser, whose parallax distance is d=20.4^{+2.8} ...

    • Astraeus V: the emergence and evolution of metallicity scaling relations during the epoch of reionization 

      Ucci, Graziano; Dayal, Pratika; Hutter, Anne; Kobayashi, Chiaki; Gottloeber, Stefan; Yepes, Gustavo; Hunt, Leslie; Legrand, Laurent; Tortora, Crescenzo (2023-01-30)
      In this work, we have implemented a detailed physical model of galaxy chemical enrichment into the ASTRAEUS (seminumerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dark matter simUlationS) ...

    • Astrobiological signatures: prospects for the detection of non-terrestrial biological material 

      Gledhill, T.; Sparks, W.; Ulanowski, Z.; Hough, J.; DasSarma, S. (2007)
      The possibilities for detecting non-terrestrial biological material are briefly reviewed in light of the flurry of extrasolar planet detections over the last ten years and the forthcoming space missions designed to search ...

    • Astrochemical Properties of Planck Cold Clumps 

      Tatematsu, Ken'ichi; Liu, Tie; Ohashi, Satoshi; Sanhueza, Patricio; Nguyen-Luong, Quang; Hirota, Tomoya; Liu, Sheng-Yuan; Hirano, Naomi; Choi, Minho; Kang, Miju; Thompson, Mark; Fuller, Garry; Wu, Yuefang; Francesco, James Di; Kim, Kee-Tae; Wang, Ke; Ristorcelli, Isabelle; Juvela, Mika; Shinnaga, Hiroko; Cunningham, Maria R.; Saito, Masao; Lee, Jeong-Eun; Toth, L. Viktor; He, Jinhua; Sakai, Takeshi; Kim, Jungha; collaboration, JCMT Large Program "SCOPE"; collaboration, TRAO Key Science Program "TOP" (2017-03-01)
      We observed thirteen Planck cold clumps with the James Clerk Maxwell Telescope/SCUBA-2 and with the Nobeyama 45 m radio telescope. The N$_2$H$^+$ distribution obtained with the Nobeyama telescope is quite similar to SCUBA-2 ...

    • Astronometry with the Hubble Space Telescope : trigonometric parallaxes of planetary nebula nuclei NGC 6853, NGC 7293, Abell 31 and DeHt 5 

      Benedict, G.F.; McArthur, B.E.; Napiwotzki, R.; Harrison, T.E.; Harris, H.C.; Nelan, E.; Bond, H.E.; Patterson, R.J.; Ciardullo, R. (2009)
      We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our reduction and analysis ...