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

Now showing items 241-260 of 3233

    • An AzTEC 1.1-mm Survey for ULIRGs in the field of the Galaxy Cluster MS 0451.6-0305 

      Wardlow, J. L.; Smail, Ian; Wilson, G.W.; Yun, M. S.; Coppin, Kristen; Cybulski, R.; Geach, J. E.; Ivison, R.J.; Aretxaga, I.; Austermann, J.E.; Edge, A. C.; Fazio, G. G.; Huang, J.; Hughes, D. H.; Kodama, T.; Kang, Y.; Kim, S.; Perera, T. A.; Scott, K. S. (2010)
      We have undertaken a deep (sigma~1.1 mJy) 1.1-mm survey of the z=0.54 cluster MS 0451.6-0305 using the AzTEC camera on the James Clerk Maxwell Telescope. We detect 36 sources with S/N>3.5 in the central 0.10 deg^2 and ...

    • AzTEC half square degree survey of the SHADES fields - II : Identifications, redshifts and evidence for large-scale structure 

      Michalowski, M. J.; Dunlop, J.S.; Ivison, R.J.; Cirasuolo, M.; Caputi, K.I.; Aretxaga, I.; Arumugam, V.; Austermann, J.E.; Chapin, E.L.; Chapman, S.C.; Coppin, Kristen; Egami, E.; Hughes, D.H.; Ibar, E.; Mortier, A.M.J.; Schael, A.M.; Scott, K.S.; Smail, I.; Targett, T.A.; Wagg, J.; Wilson, G.W.; Xu, L.; Yun, M. (2012-11-01)
      The Astronomical Thermal Emission Camera (AzTEC) 1.1mm survey of the two SCUBA HAlf Degree Extragalactic Survey (SHADES) fields is the largest (0.7 deg ) blank-field millimetre-wavelength (mm-wavelength) survey undertaken ...

    • AzTEC half square degree survey of the SHADES fields – I : Maps, catalogues and source counts 

      Austermann, J.E.; Dunlop, J.S.; Perera, T.A.; Scott, K.S.; Wilson, G.W.; Aretxaga, I.; Hughes, D.H.; Almaini, O.; Chapin, E.L.; Chapman, S. C.; Cirasuolo, M.; Clements, D. L.; Coppin, Kristen; Dunne, L.; Dye, Simon; Eales, S. A.; Stevens, J. A.; Egami, E. (2010)
      We present the first results from the largest deep extragalactic mm-wavelength survey undertaken to date. These results are derived from maps covering over 0.7 deg2, made at λ= 1.1 mm , using the AzTEC continuum camera ...

    • B-fields in Star-Forming Region Observations (BISTRO) : Magnetic Fields in the Filamentary Structures of Serpens Main 

      BISTRO (2022-02-22)
      We present 850 $\mu$m polarimetric observations toward the Serpens Main molecular cloud obtained using the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT) as part of the B-fields In STar-forming Region ...

    • The B-type giant HD 271791 in the Galactic halo : Linking run-away stars to hyper-velocity stars 

      Heber, U.; Edelmann, H.; Napiwotzki, R.; Altmann, M.; Scholz, R.D. (2008-05-01)
      Context. Young, massive stars have been found in the distant Galactic halo. Dynamical ejection from the Galactic disc has been suggested as the origin of these "run-away stars". The so-called hyper-velocity stars have been ...

    • The barium isotopic fractions in five metal-poor stars 

      Gallagher, Andrew; Ryan, Sean G.; Hosford, Adam; Garcia Perez, A E; Aoki, W; Honda, S (2012)
      Context. Theory and observations of heavy element nucleosynthesis are in conflict with one-another. Theory states that in the most metal-poor stars, the rapid (r-) neutron-capture nucleosynthetic process would be dominant ...

    • The barium isotopic mixture for the metal-poor subgiant star HD 140283 

      Gallagher, A.J.; Ryan, Sean G.; Garcia Perez, A.E.; Aoki, W. (2010)
      Context: Current theory regarding heavy element nucleosynthesis in metal-poor environments states that the r-process would be dominant. The star HD 140283 has been the subject of debate after it appeared in some studies ...

    • Barium lines in high-quality spectra of two metal-poor giants in the Galactic halo 

      Cescutti, G.; Morossi, C.; Franchini, M.; Marcantonio, P. Di; Chiappini, C.; Steffen, M.; Valentini, M.; François, P.; Christlieb, N.; Cortés, C.; Kobayashi, C.; Depagne, E. (2021-10-01)
      Context. Theoretical results showed the possibility that neutron capture elements were produced in the early Universe by two different sources: a frequent s-process source hosted by rotating massive stars, and a rare ...

    • BASIS: Bayfordbury single-object integral field spectrograph 

      Richards, S.; Martin, Bill; Campbell, D.; Jones, H.R.A.; Bland-Hawthorn, J.; Lawrence, J.; Brinks, E.; Bryant, J.J.; Fogarty, L.; Gallaway, M.; Goodwin, M.; Leon-Saval, S.; Sarzi, M.; Smith, Daniel (SPIE, 2012-09)
      We present an inexpensive (<US$500) and easily replicable integral field unit for use on small aperture telescopes. Based on a commercial small spectrograph (SBIG Self-Guiding Spectrograph) and a 37 optical fibre bundle ...

    • Bayesian analysis of the radial velocities of HD 11506 reveals another planetary companion 

      Tuomi, Mikko; Kotiranta, S. (2009-03-01)
      Aims. We aim to demonstrate the efficiency of a Bayesian approach in analysing radial velocity data by reanalysing a set of radial velocity measurements. Methods. We present Bayesian analysis of a recently published set ...

    • Bayesian hierarchical modelling of the M*–SFR relation from 1 ≲ z ≲ 6 in ASTRODEEP 

      Sandles, L.; Curtis-Lake, E.; Charlot, S.; Chevallard, J.; Maiolino, R. (2022-07-31)
      The Hubble Frontier Fields represent the opportunity to probe the high-redshift evolution of the main sequence of star-forming galaxies to lower masses than possible in blank fields thanks to foreground lensing of massive ...

    • Bayesian inference of jet bulk-flow speeds in Fanaroff–Riley type II radio sources 

      Mullin, L.M.; Hardcastle, M.J. (2009)
      Radio jet and core data for a complete sample of 98 Fanaroff–Riley type II sources with z < 1 are analysed with a Markov Chain Monte Carlo model fitting method to obtain constraints on bulk-flow speeds in the beam. The ...

    • Bayesian inference of T Tauri star properties using multi-wavelength survey photometry 

      Barentsen, G.; Drew, J.E.; Vink, J.S.; Sale, S.E. (2013-01-01)
      There are many pertinent open issues in the area of star and planet formation. Large statistical samples of young stars across star-forming regions are needed to trigger a breakthrough in our understanding, but most optical ...

    • Bayesian search for low-mass planets around nearby M dwarfs. Estimates for occurrence rate based on global detectability statistics 

      Tuomi, Mikko; Jones, Hugh; Barnes, John R.; Anglada-Escudé, Guillem; Jenkins, James S. (2014-06-21)
      Due to their higher planet-star mass ratios, M dwarfs are the easiest targets for detection of low-mass planets orbiting nearby stars using Doppler spectroscopy. Furthermore, because of their low masses and luminosities, ...

    • Be 7 (n,p) Li 7 Reaction and the Cosmological Lithium Problem : Measurement of the Cross Section in a Wide Energy Range at n-TOF at CERN 

      (The n-TOF Collaboration [www.cern.ch/ntof]) (2018-07-24)
      We report on the measurement of the Be7(n,p)Li7 cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n-TOF facility at CERN. This reaction plays a ...

    • Be 7 (n,α) He 4 Reaction and the Cosmological Lithium Problem : Measurement of the Cross Section in a Wide Energy Range at n-TOF at CERN 

      Barbagallo, M.; Musumarra, A.; Cosentino, L.; Maugeri, E.; Heinitz, S.; Mengoni, A.; Dressler, R.; Schumann, D.; Käppeler, F.; Colonna, N.; Finocchiaro, P.; Ayranov, M.; Damone, L.; Kivel, N.; Aberle, O.; Altstadt, S.; Andrzejewski, J.; Audouin, L.; Bacak, M.; Balibrea-Correa, J.; Barros, S.; Bécares, V.; Bečvář, F.; Beinrucker, C.; Berthoumieux, E.; Billowes, J.; Bosnar, D.; Brugger, M.; Caamaño, M.; Calviani, M.; Calviño, F.; Cano-Ott, D.; Cardella, R.; Casanovas, A.; Castelluccio, D. M.; Cerutti, F.; Chen, Y. H.; Chiaveri, E.; Cortés, G.; Cortés-Giraldo, M. A.; Cristallo, S.; Diakaki, M.; Domingo-Pardo, C.; Dupont, E.; Duran, I.; Fernandez-Dominguez, B.; Ferrari, A.; Ferreira, P.; Furman, W.; Ganesan, S.; García-Rios, A.; Gawlik, A.; Glodariu, T.; Göbel, K.; Gonçalves, I. F.; González-Romero, E.; Griesmayer, E.; Guerrero, C.; Gunsing, F.; Harada, H.; Heftrich, T.; Heyse, J.; Jenkins, D. G.; Jericha, E.; Katabuchi, T.; Kavrigin, P.; Kimura, A.; Kokkoris, M.; Krtička, M.; Leal-Cidoncha, E.; Lerendegui, J.; Lederer, C.; Leeb, H.; Lo Meo, S.; Lonsdale, S. J.; Losito, R.; MacIna, D.; Marganiec, J.; Martínez, T.; Massimi, C.; Mastinu, P.; Mastromarco, M.; Mazzone, A.; Mendoza, E.; Milazzo, P. M.; Mingrone, F.; Mirea, M.; Montesano, S.; Nolte, R.; Oprea, A.; Pappalardo, A.; Patronis, N.; Pavlik, A.; Perkowski, J.; Piscopo, M.; Plompen, A.; Porras, I.; Praena, J.; Quesada, J.; Rajeev, K.; Rauscher, T.; Reifarth, R.; Riego-Perez, A.; Rout, P.; Rubbia, C.; Ryan, J.; Sabate-Gilarte, M.; Saxena, A.; Schillebeeckx, P.; Schmidt, S.; Sedyshev, P.; Smith, A. G.; Stamatopoulos, A.; Tagliente, G.; Tain, J. L.; Tarifeño-Saldivia, A.; Tassan-Got, L.; Tsinganis, A.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Vlachoudis, V.; Vlastou, R.; Vollaire, J.; Wallner, A.; Warren, S.; Weigand, M.; Weiß, C.; Wolf, C.; Woods, P. J.; Wright, T.; Žugec, P. (2016-10-03)
      The energy-dependent cross section of the Be7(n,α)He4 reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron ...

    • BEAGLE-AGN I: simultaneous constraints on the properties of gas in star-forming and AGN narrow-line regions in galaxies 

      Vidal-García, Alba; Plat, A.; Curtis-Lake, E.; Feltre, A.; Hirschmann, M.; Chevallard, J.; Charlot, S. (2024-01-01)
      We present the addition of nebular emission from the narrow-line regions (NLR) surrounding active galactic nuclei (AGNs) to beagle (BayEsian Analysis of GaLaxy sEds). Using a set of idealized spectra, we fit to a set of ...

    • Beaming in Radio-Quiet AGN 

      Young, S.; Hough, J.; Axon, D.J.; Bailey, J. (Astronomical Society of the Pacific, 1997)
      We have obtained new optical spectropolarimetric data for the radio-quiet Seyfert NGC 1068, taken through apertures on the nucleus and at two positions within the ionization/scattering cone. The equivalent width of scattered ...

    • The beautiful mess in Abell 2255 

      Botteon, A.; Brunetti, G.; Weeren, R. J. van; Shimwell, T. W.; Pizzo, R. F.; Cassano, R.; Iacobelli, M.; Gastaldello, F.; Bîrzan, L.; Bonafede, A.; Brüggen, M.; Cuciti, V.; Dallacasa, D.; Gasperin, F. de; Gennaro, G. Di; Drabent, A.; Hardcastle, M. J.; Hoeft, M.; Mandal, S.; Röttgering, H. J. A.; Simionescu, A. (2020-07-07)
      We present LOFAR observations of one of the most spectacular objects in the radio sky: Abell 2255. This is a nearby ($z = 0.0806$) merging galaxy cluster hosting one of the first radio halos ever detected in the intra-cluster ...

    • Before the first supernova: combined effects of H II regions and winds on molecular clouds 

      Ngoumou, J.; Ercolano, B.; Bonnell, I.~A.; Dale, James (2014-07-21)
      We model the combined effects of photoionization and momentum-driven winds from O-stars on molecular clouds spanning a parameter space of initial conditions. The dynamical effects of the winds are very modest. However, in ...