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

Now showing items 221-240 of 3233

    • ATLASGAL -- physical parameters of dust clumps associated with 6.7 GHz methanol masers 

      Billington, S. J.; Urquhart, J. S.; Konig, C.; Moore, T. J. T.; Eden, D. J.; Breen, S. L.; Kim, W. -J.; Thompson, M. A.; Ellingsen, S. P.; Menten, K. M.; Wyrowski, F.; Leurini, S. (2019-12-01)
      We have constructed the largest sample of dust-associated class II 6.7 GHz methanol masers yet obtained. New measurements from the the Methanol MultiBeam (MMB) Survey were combined with the 870 $\mu$m APEX Telescope Large ...

    • ATLASGAL -- Relationship between dense star forming clumps and interstellar masers 

      Billington, S. J.; Urquhart, J. S.; König, C.; Beuther, H.; Breen, S. L.; Menten, K. M.; Campbell-White, J.; Ellingsen, S. P.; Thompson, M. A.; Moore, T. J. T.; Eden, D. J.; Kim, W. -J.; Leurini, S. (2020-09-29)
      We have used catalogues from several Galactic plane surveys and dedicated observations to investigate the relationship between various maser species and Galactic star forming clumps, as identified by the ATLASGAL survey. ...

    • ATLASGAL --- Molecular fingerprints of a sample of massive star forming clumps 

      Urquhart, J. S.; Figura, C.; Wyrowski, F.; Giannetti, A.; Kim, W. -J.; Wienen, M.; Leurini, S.; Pillai, T.; Csengeri, T.; Gibson, S. J.; Menten, K.; Moore, T. J. T.; Thompson, M. A. (2019-04-21)
      We have conducted a 3-mm molecular-line survey towards 570 high-mass star-forming clumps, using the Mopra telescope. The sample is selected from the 10 000 clumps identified by the ATLASGAL (APEX Telescope Large Area Survey ...

    • Atmospheric Retrieval of L Dwarfs: Benchmarking Results and Characterizing the Young Planetary Mass Companion HD 106906 b in the Near-infrared 

      Adams, Arthur D.; Meyer, Michael R.; Howe, Alex R.; Burningham, Ben; Daemgen, Sebastian; Fortney, Jonathan; Line, Mike; Marley, Mark; Quanz, Sascha P.; Todorov, Kamen (2023-10-13)
      We present model constraints on the atmospheric structure of HD 106906 b, a planetary-mass companion orbiting at a ∼700 au projected separation around a 15 Myr old stellar binary, using the APOLLO retrieval code on spectral ...

    • An Atmospheric Retrieval of the Brown Dwarf Gliese 229B 

      Calamari, Emily; Faherty, Jacqueline K.; Burningham, Ben; Gonzales, Eileen; Bardalez-Gagliuffi, Daniella; Vos, Johanna M.; Gemma, Marina; Whiteford, Niall; Gaarn, Josefine (2022-12-01)
      We present results from an atmospheric retrieval analysis of Gl 229B using the Brewster retrieval code. We find the best fit model to be cloud-free, consistent with the T dwarf retrieval work of Line et al.; Zalesky et al. ...

    • Atomic lines in infrared spectra for ultracool dwarfs 

      Lyubchik, Y.; Jones, H.R.A.; Pavlenko, Y.; Viti, S.; Pickering, J.C.; Blackwell-Whitehead, R.J. (2004-03)
      We provide a set of atomic lines which are suitable for the description of ultracool dwarf spectra from 10 000 to 25 000 Å. This atomic linelist was made using both synthetic spectra calculations and existing atlases of ...

    • Au-197(n,gamma) cross section in the resonance region 

      Massimi, C.; Domingo-Pardo, C.; Vannini, G.; Audouin, L.; Guerrero, C.; Abbondanno, U.; Aerts, G.; Alvarez, H.; Alvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Badurek, G.; Baumann, P.; Becvar, F.; Belloni, F.; Berthoumieux, E.; Calvino, F.; Calviani, M.; Cano-Ott, D.; Capote, R.; Carrapico, C.; Cennini, P.; Chepel, V.; Chiaveri, E.; Colonna, N.; Cortes, G.; Couture, A.; Cox, J.; Dahlfors, M.; David, S.; Dillmann, I.; Dridi, W.; Duran, I.; Eleftheriadis, C.; Ferrant, L.; Ferrari, A.; Ferreira-Marques, R.; Fujii, K.; Furman, W.; Galanopoulos, S.; Goncalves, I. F.; Gonzalez-Romero, E.; Gramegna, F.; Gunsing, F.; Haas, B.; Haight, R.; Heil, M.; Herrera-Martinez, A.; Rauscher, T.; N TOF Collaboration (2010-04)
      The (n,gamma) cross section of Au-197 has been measured at n_TOF in the resolved resonance region, up to 5 keV, with the aim of improving the accuracy in an energy range where it is not yet considered standard. The ...

    • Au-197(n,gamma) cross section in the unresolved resonance region 

      Lederer, C.; Colonna, N.; Domingo-Pardo, C.; Gunsing, F.; Kaeppeler, F.; Massimi, C.; Mengoni, A.; Wallner, A.; Abbondanno, U.; Aerts, G.; Alvarez, H.; Alvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; Barbagallo, M.; Baumann, P.; Becvar, F.; Belloni, F.; Berthoumieux, E.; Calviani, M.; Calvino, F.; Cano-Ott, D.; Capote, R.; Carrapico, C.; Carrillo de Albornoz, A.; Cennini, P.; Chepel, V.; Chiaveri, E.; Cortes, G.; Couture, A.; Cox, J.; Dahlfors, M.; David, S.; Dillmann, I.; Dolfini, R.; Dridi, W.; Duran, I.; Eleftheriadis, C.; Embid-Segura, M.; Ferrant, L.; Ferrari, A.; Ferreira-Marques, R.; Fitzpatrick, L.; Frais-Koelbl, H.; Fujii, K.; Furman, W.; Rauscher, T.; n TOF Collaboration (2011-03-17)
      The cross section of the reaction Au-197(n,gamma) was measured with the time-of-flight technique at the n_TOF (neutron time-of-flight) facility in the unresolved resonance region between 5 and 400 keV using a pair of C6D6 ...

    • The Australia Telescope Compact Array Broad-band Backend: description and first results 

      Wilson, Warwick E.; Ferris, R. H.; Axtens, P.; Brown, A.; Davis, E.; Hampson, G.; Leach, M.; Roberts, P.; Saunders, S.; Koribalski, B. S.; Caswell, J. L.; Lenc, E.; Stevens, J.; Voronkov, M. A.; Wieringa, M. H.; Brooks, K.; Edwards, P. G.; Ekers, R. D.; Emonts, B.; Hindson, L.; Johnston, S.; Maddison, S. T.; Mahony, E. K.; Malu, S. S.; Massardi, M.; Mao, M. Y.; McConnell, D.; Norris, R. P.; Schnitzeler, D.; Subrahmanyan, R.; Urquhart, J. S.; Thompson, Mark; Wark, R. M. (2011-09)
      Here, we describe the Compact Array Broad-band Backend (CABB) and present first results obtained with the upgraded Australia Telescope Compact Array (ATCA). The 16-fold increase in observing bandwidth, from 2 x 128 to 2 x ...

    • Author Correction : A small and vigorous black hole in the early Universe(Nature, 10.1038/s41586-024-07052-5) 

      Maiolino, Roberto; Scholtz, Jan; Witstok, Joris; Carniani, Stefano; D’Eugenio, Francesco; de Graaff, Anna; Übler, Hannah; Tacchella, Sandro; Curtis-Lake, Emma; Arribas, Santiago; Bunker, Andrew; Charlot, Stéphane; Chevallard, Jacopo; Curti, Mirko; Looser, Tobias J.; Maseda, Michael V.; Rawle, Timothy D.; Rodríguez del Pino, Bruno; Willott, Chris J.; Egami, Eiichi; Eisenstein, Daniel J.; Hainline, Kevin N.; Robertson, Brant; Williams, Christina C.; Willmer, Christopher N. A.; Baker, William M.; Boyett, Kristan; DeCoursey, Christa; Fabian, Andrew C.; Helton, Jakob M.; Ji, Zhiyuan; Jones, Gareth C.; Kumari, Nimisha; Laporte, Nicolas; Nelson, Erica J.; Perna, Michele; Sandles, Lester; Shivaei, Irene; Sun, Fengwu (2024-06-06)
      Correction to: Naturehttps://doi.org/10.1038/s41586-024-07052-5 Published online 17 January 2024 In the version of the article initially published, the coloured lines in Fig. 1b were incorrect and did not show the fit to ...

    • Automated Reduction and Calibration of SCUBA Archive Data Using ORAC-DR 

      Jenness, T.; Stevens, J. A.; Archibald, E.N.; Economou, F.; Jessop, N.; Robson, E.I.; Tilanus, R.P.J.; Holland, W.S. (Astronomical Society of the Pacific, 2001)
      The Submillimetre Common User Bolometer Array (SCUBA) instrument has been operating on the James Clerk Maxwell Telescope (JCMT) since 1997. The data archive is now sufficiently large that it can be used for investigating ...

    • An Automated tool to detect variable sources in the Vista Variables in the Vía Láctea Survey. The VVV Variables (V^4) catalog of tiles d001 and d002 

      Medina, Nicolás; Borissova, Jura; Bayo, Amelia; Kurtev, Radostin; Navarro-Molina, Claudio; Kuhn, Michael; Kumar, Nanda; Lucas, Philip W.; Catelan, Márcio; Minniti, Dante; Smith, Leigh C. (2018-08-24)
      Time-varying phenomena are one of the most substantial sources of astrophysical information, and their study has led to many fundamental discoveries in modern astronomy. We have developed an automated tool to search for ...

    • An automatic taxonomy of galaxy morphology using unsupervised machine learning 

      Hocking, Alex; Geach, James E.; Sun, Yi; Davey, Neil (2017-09-15)
      We present an unsupervised machine learning technique that automatically segments and labels galaxies in astronomical imaging surveys using only pixel data. Distinct from previous unsupervised machine learning approaches ...

    • The average submillimetre properties of Lyman-alpha Blobs at z=3 

      Hine, N. K.; Geach, J. E.; Matsuda, Y.; Lehmer, B. D.; Michalowski, M. J.; Farrah, D.; Spaans, M.; Oliver, S. J.; Smith, D. J. B.; Chapman, S. C.; Jenness, T.; Alexander, D. M.; Robson, I.; Werf, P. van der (2016-08-21)
      Ly-alpha blobs (LABs) offer insight into the complex interface between galaxies and their circumgalactic medium. Whilst some LABs have been found to contain luminous star-forming galaxies and active galactic nuclei that ...

    • Axion emission and detection from a galactic supernova 

      Carenza, Pierluca; Co, Giampaolo; Fischer, Tobias; Giannotti, Maurizio; Mirizzi, Alessandro; Rauscher, Thomas (Verlag Deutsches Elektronen-Synchrotron, 2019)
      A Galactic supernova (SN) axion signal would be detected in a future neutrino Mtonclass water Cherenkov detector, such as the proposed Hyper-Kamiokande in Japan. The main detection channel for axions is absorption on the ...

    • Axisymmetry in protoplanetary nebulae: using imaging polarimetry to investigate envelope structure 

      Gledhill, T.; Chrysostomou, A.; Hough, J.; Yates, J.A. (2001-04)
      We use ground-based imaging polarimetry to detect and image the dusty circumstellar envelopes of a sample of proto-planetary nebulae (PPNe) at near-infrared wavelengths. This technique allows the scattered light from the ...

    • Azimuthal variations of gas-phase oxygen abundance in NGC 2997 

      Ho, I-Ting; Meidt, Sharon E.; Kudritzki, Rolf-Peter; Groves, Brent A.; Seibert, Mark; Madore, Barry F.; Schinnerer, Eva; Rich, Jeffrey A.; Kobayashi, Chiaki; Kewley, Lisa J. (2018-10-15)
      The azimuthal variation of the HII region oxygen abundance in spiral galaxies is a key observable for understanding how quickly oxygen produced by massive stars can be dispersed within the surrounding interstellar medium. ...

    • AzTEC 1.1 mm observations of high-z protocluster environments : SMG overdensities and misalignment between AGN jets and SMG distribution 

      Zeballos, M.; Aretxaga, I.; Humphrey, A.; Wilson, G. W.; Austermann, J.; Dunlop, J. S.; Ezawa, H.; Ferrusca, D.; Hatsukade, B.; Ivison, R. J.; Kawabe, R.; Kim, S.; Kodama, T.; Kohno, K.; Montaña, A.; Nakanishi, K.; Plionis, M.; Sánchez-Argüelles, D.; Stevens, J. A.; Tamura, Y.; Velazquez, M.; Yun, M. S. (2018-10)
      We present observations at 1.1 mm towards 16 powerful radio galaxies and a radio-quiet quasar at 0.5 > z > 6.3 acquired with the AzTEC camera mounted at the James Clerk Maxwell Telescope and Atacama Submillimeter Telescope ...

    • An AzTEC 1.1 mm survey of the GOODS-N field - I : Maps, catalogue and source statistics 

      Perera, T.A.; Chapin, E.L.; Austermann, J.E.; Scott, K.S.; Wilson, G.W.; Halpern, M.; Pope, A.; Scott, D.; Yun, M.S.; Lowenthal, J.D.; Morrison, G.; Aretxaga, I.; Bock, J.J.; Coppin, Kristen; Crowe, M.; Frey, L.; Hughes, D.H.; Kang, Y.; Kim, S.; Mauskopf, P. D. (2008-12-01)
      We have conducted a deep and uniform 1.1 mm survey of the Great Observatories Origins Deep Survey-North (GOODS-N) field with AzTEC on the James Clerk Maxwell Telescope. Here, we present the first results from this survey ...

    • An AzTEC 1.1 mm survey of the GOODS-N field - II : Multiwavelength identifications and redshift distribution 

      Chapin, E.L.; Pope, A.; Scott, D.; Aretxaga, I.; Austermann, J.E.; Chary, R-R.; Coppin, Kristen; Halpern, M.; Hughes, D.H.; Lowenthal, J.D.; Morrison, G.E.; Perera, T.A.; Scott, K.S.; Wilson, G.W.; Yun, M. S. (2009-10-01)
      We present results from a multiwavelength study of 29 sources (false detection probabilities