Recent Submissions

  • Magnetic fields in discs: What can be learned from infrared and mm polarimetry? 

    Aitken, David K.; Efstathiou, Andreas; McCall, Alan; James H. Hough, James (2002-01-21)
    Polarimetric imaging in the infrared and submm offers the possibility of identifying magnetic field configurations in astronomical objects. To test this conjecture a set of field geometries within internally heated discs ...
  • Excited OH + , H 2 O + , and H 3 O + in NGC 4418 and Arp 220 

    González-Alfonso, Eduardo; Fischer, Jacqueline R.; Bruderer, Simon; Müller, Holger S.P.; Graciá-Carpio, Javier; Sturm, Eckhard; Lutz, Dieter; Poglitsch, Albrecht; Feuchtgruber, Helmut; Veilleux, Sylvain; Contursi, Alessandra; Sternberg, Amiel; Hailey-Dunsheath, Steven; Verma, Aprajita; Christopher, Natalie M.; Davies, Richard I.; Genzel, Reinhardt; Tacconi, Linda J. (2013-01-01)
    We report on Herschel/PACS observations of absorption lines of OH + , H 2 O + and H 3 O + in NGC 4418 and Arp 220. Excited lines of OH + and H 2 O + with E lower of at least 285 and ∼200 K, respectively, are detected in ...
  • BROAD [C II] LINE WINGS AS TRACER of MOLECULAR and MULTI-PHASE OUTFLOWS in INFRARED BRIGHT GALAXIES 

    Janssen, Annemieke W.; Christopher, Natalie M.; Sturm, Eckhard; Veilleux, Sylvain; Contursi, Alessandra; González-Alfonso, Eduardo; Fischer, Jacqueline R.; Davies, Richard I.; Verma, Aprajita; Graciá-Carpio, Javier; Genzel, Reinhardt; Lutz, Dieter; Sternberg, Amiel; Tacconi, Linda J.; Burtscher, Leonard; Poglitsch, Albrecht (2016-05-01)
    We report a tentative correlation between the outflow characteristics derived from OH absorption at 119 μm and [C ii] emission at 158 μm in a sample of 22 local and bright ultraluminous infrared galaxies (ULIRGs). For this ...
  • The Dark Energy Survey: More than dark energy - an overview 

    Abbott, T.M.C.; Abdalla, F.B.; Aleksić, J.; Allam, S.; Amara, A.; Bacon, D.; Balbinot, E.; Banerji, M.; Bechtol, K.; Benoit-Lévy, A.; Bernstein, G.M.; Bertin, E.; Blazek, J.; Bonnett, C.; Bridle, S.; Brooks, D.; Brunner, R.J.; Buckley-Geer, E.; Burke, D.L.; Caminha, G.B.; Capozzi, D.; Carlsen, J.; Carnero-Rosell, A.; Carollo, M.; Carrasco-Kind, M.; Carretero, J.; Castander, F.J.; Clerkin, L.; Collett, T.; Conselice, C.; Crocce, M.; Cunha, C.E.; D'Andrea, C.B.; da Costa, L.N.; Davis, T.M.; Desai, S.; Diehl, H.T.; Dietrich, J.P.; Dodelson, S.; Doel, P.; Drlica-Wagner, A.; Estrada, J.; Etherington, J.; Evrard, A.E.; Fabbri, J.; Finley, D.A.; Flaugher, B.; Foley, R.J.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D.W.; Giannantonio, T.; Goldstein, D.A.; Gruen, D.; Gruendl, R.A.; Guarnieri, P.; Gutierrez, G.; Hartley, W.; Honscheid, K.; Jain, B.; James, D.J.; Jeltema, T.; Jouvel, S.; Kessler, R.; King, A.; Kirk, D.; Kron, R.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Li, T.S.; Lima, M.; Lin, H.; Maia, M.A.G.; Makler, M.; Manera, M.; Maraston, C.; Marshall, J.L.; Martini, P.; McMahon, R.G.; Melchior, P.; Merson, A.; Miller, C.J.; Miquel, R.; Mohr, J.J.; Morice-Atkinson, X.; Naidoo, K.; Neilsen, E.; Nichol, R.C.; Nord, B.; Ogando, R.; Ostrovski, F.; Palmese, A.; Papadopoulos, Andreas; Peiris, H.V.; Peoples, J.; Percival, W.J.; Plazas, A.A.; Reed, S.L.; Refregier, A.; Romer, A.K.; Roodman, A.; Ross, A.; Rozo, E.; Rykoff, E.S.; Sadeh, I.; Sako, M.; Sánchez, C.; Sanchez, E.; Santiago, B.; Scarpine, V.; Schubnell, M.; Sevilla-Noarbe, I.; Sheldon, E.; Smith, M.; Smith, R.C.; Soares-Santos, M.; Sobreira, F.; Soumagnac, M.; Suchyta, E.; Sullivan, M.; Swanson, M.; Tarle, G.; Thaler, J.; Thomas, D.; Thomas, R.C.; Tucker, D.; Vieira, J.D.; Vikram, V.; Walker, A.R.; Wechsler, R.H.; Weller, J.; Wester, W.; Whiteway, L.; Wilcox, H.; Yanny, B.; Zhang, Y.; Zuntz, J. (2016-01-01)
    This overview paper describes the legacy prospect and discovery potential of the Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from the DES early data. DES is using a wide-field camera ...
  • DES14X3taz: A TYPE I SUPERLUMINOUS SUPERNOVA SHOWING A LUMINOUS, RAPIDLY COOLING INITIAL PRE-PEAK BUMP 

    Smith, M.; Sullivan, M.; D'Andrea, C.B.; Castander, F.J.; Casas, R.; Prajs, S.; Papadopoulos, Andreas; Nichol, R.C.; Karpenka, N.V.; Bernard, S.R.; Brown, P.; Cartier, R.; Cooke, J.; Curtin, C.; Davis, T.M.; Finley, D.A.; Foley, R.J.; Gal-Yam, A.; Goldstein, D.A.; González-Gaitán, S.; Gupta, R.R.; Howell, D.A.; Inserra, C.; Kessler, R.; Lidman, C.; Marriner, J.; Nugent, P.; Pritchard, T.A.; Sako, M.; Smartt, S.; Smith, R.C.; Spinka, H.; Thomas, R.C.; Wolf, R.C.; Zenteno, A.; Abbott, T.M.C.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Rosell, A.C.; Kind, M.C.; Carretero, J.; Crocce, M.; Cunha, C.E.; Da Costa, L.N.; Desai, S.; Diehl, H.T.; Doel, P.; Estrada, J.; Evrard, A.E.; Flaugher, B.; Fosalba, P.; Frieman, J.; Gerdes, D.W.; Gruen, D.; Gruendl, R.A.; James, D.J.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Li, T.S.; Marshall, J.L.; Martini, P.; Miller, C.J.; Miquel, R.; Nord, B.; Ogando, R.; Plazas, A.A.; Reil, K.; Romer, A.K.; Roodman, A.; Rykoff, E.S.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Sevilla-Noarbe, I.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M.E.C.; Tarle, G.; Walker, A.R.; Wester, W. (2016-02-10)
    We present DES14X3taz, a new hydrogen-poor superluminous supernova (SLSN-I) discovered by the Dark Energy Survey (DES) supernova program, with additional photometric data provided by the Survey Using DECam for Superluminous ...
  • HOST GALAXY IDENTIFICATION for SUPERNOVA SURVEYS 

    Gupta, R.R.; Kuhlmann, S.; Kovacs, E.; Spinka, H.; Kessler, R.; Goldstein, D.A.; Liotine, C.; Pomian, K.; D'Andrea, C.B.; Sullivan, M.; Carretero, J.; Castander, F.J.; Nichol, R.C.; Finley, D.A.; Fischer, J.A.; Foley, R.J.; Kim, A.G.; Papadopoulos, Andreas; Sako, M.; Scolnic, D.M.; Smith, M.; Tucker, B.E.; Uddin, S.; Wolf, R.C.; Yuan, F.; Abbott, T.M.C.; Abdalla, F.B.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Rosell, A.C.; Kind, M.C.; Cunha, C.E.; Costa, L.N.D.; Desai, S.; Doel, P.; Eifler, T.F.; Evrard, A.E.; Flaugher, B.; Fosalba, P.; Gaztaaga, E.; Gruen, D.; Gruendl, R.; James, D.J.; Kuehn, K.; Kuropatkin, N.; Maia, M.A.G.; Marshall, J.L.; Miquel, R.; Plazas, A.A.; Romer, A.K.; Sánchez, E.; Schubnell, M.; Sevilla-Noarbe, I.; Sobreira, F.; Suchyta, E.; Swanson, M.E.C; Tarle, G.; Walker, A.R.; Wester, W. (2016-12-01)
    Host galaxy identification is a crucial step for modern supernova (SN) surveys such as the Dark Energy Survey and the Large Synoptic Survey Telescope, which will discover SNe by the thousands. Spectroscopic resources are ...
  • AKARI and IRAS: From beam corrections to SEDs 

    Clements, David L.; Rowan-Robinson, Michael; Pearson, Chris; Afonso, José M.; Labouteiller, Vianney; Farrah, Duncan G.; Efstathiou, Andreas; Greenslade, Joshua; Wang, Lingyu (2019-01-01)
    There is significant scientific value to be gained from combining AKARI fluxes with data at other far-infrared (IR) wavelengths from the Infrared Astronomical Satellite (IRAS) and Herschel missions. To be able to do this ...
  • A mobile crowd sensing application for hypertensive patients 

    Jovanović, Slađana; Jovanović, Milan; Škorić, Tamara; Jokić, Stevan D.; Milovanović, Branislav D.; Katzis, Konstantinos; Bajić, Dragana (2019-01-02)
    Mobile crowd sensing (MCS) is an application that collects data from a network of conscientious volunteers and implements it for the common or personal benefit. This contribution proposes an implementation that collects ...
  • Dust attenuation and H α emission in a sample of galaxies observed with Herschel at 0.6 < z < 1.6 

    Buat, Véronique; Boquien, Médéric; Małek, Katarzyna E.; Corre, D.; Salas, H.; Roehlly, Y.; Shirley, R.; Efstathiou, Andreas (2018-11-01)
    Context. Dust attenuation shapes the spectral energy distribution of galaxies. It is particularly true for dusty galaxies in which stars experience a heavy attenuation. The combination of UV to IR photometry with the ...
  • HELP: Modelling the spectral energy distributions of Herschel detected galaxies in the ELAIS N1 field 

    Małek, Katarzyna E.; Buat, Véronique; Roehlly, Y.; Burgarella, Denis; Hurley, Peter Donald; Shirley, R.; Duncan, Kenneth J.; Efstathiou, Andreas; Papadopoulos, Andreas; Vaccari, Mattia; Farrah, Duncan G.; Marchetti, L.; Oliver, Sebastian James (2018-12-01)
    Aims. The Herschel Extragalactic Legacy Project (HELP) focuses on the data from ESA's Herschel mission, which covered over 1300 deg2 and is preparing to publish a multi-wavelength catalogue of millions of objects. Our main ...
  • Efficient processing of relevant nearest-neighbor queries 

    Efstathiades, Christodoulos; Efentakis, Alexandros; Pfoser, Dieter (2016-09-01)
    Novel Web technologies and resulting applications have led to a participatory data ecosystem that, when utilized properly, will lead to more rewarding services. In this work, we investigate the case of Location-Based ...
  • Hub Labels on the database for large-scale graphs with the COLD framework 

    Efentakis, Alexandros; Efstathiades, Christodoulos; Pfoser, Dieter (2017-10-01)
    Shortest-path computation on graphs is one of the most well-studied problems in algorithmic theory. An aspect that has only recently attracted attention is the use of databases in combination with graph algorithms, so-called ...
  • Spatio-textual user matching and clustering based on set similarity joins 

    Belesiotis, Alexandros; Skoutas, Dimitrios; Efstathiades, Christodoulos; Kaffes, Vassilis; Pfoser, Dieter (2018-06-01)
    This paper addresses the problem of matching and clustering users based on their geolocated posts. Individual posts are matched according to spatial distance and textual similarity thresholds. Then, user similarity is ...
  • Radiocolorings in periodic planar graphs: PSPACE-completeness and efficient approximations for the optimal range of frequencies 

    Fotakis, Dimitris A.; Nikoletseas., Sotiris E.; Lesta, Vicky Papadopoulou; Spirakis, Paul G. (2006-09-01)
    The Frequency Assignment Problem (FAP) in radio networks is the problem of assigning frequencies to transmitters exploiting frequency reuse while keeping signal interference to acceptable levels. The FAP is usually modelled ...
  • Hardness results and efficient approximations for frequency assignment problems: Radio labelling and radio coloring 

    Fotakis, Dimitris A.; Nikoletseas., Sotiris E.; Lesta, Vicky Papadopoulou; Spirakis, Paul G. (2001-12-01)
    The Frequency Assignment Problem (FAP) in radio networks is the problem of assigning frequencies to transmitters, exploiting frequency reuse while keeping signal interference to acceptable levels. The FAP is usually modeled ...
  • A graph-theoretic network security game 

    Mavronicolas, Marios; Lesta, Vicky Papadopoulou; Philippou, Anna; Spirakis, Paul G. (2008-11-01)
    Consider a network vulnerable to viral infection, where the security software can guarantee safety only to a limited part of it. We model this practical network scenario as a non-cooperative multi-player game on a graph, ...
  • Cooperative user-network interactions in next generation communication networks 

    Antoniou, Josephina; Lesta, Vicky Papadopoulou; Vassiliou, Vasos; Pitsillides, Andreas (2010-09-15)
    Next Generation Communication Networks employ the idea of convergence, where heterogeneous access technologies may coexist, and a user may be served by anyone of the participating access networks, motivating the emergence ...
  • Speed adaptive probabilistic flooding for vehicular ad hoc networks 

    Mylonas, Yiannos; Lestas, Marios; Pitsillides, Andreas; Ioannou, Pétros A.; Lesta, Vicky Papadopoulou (2015-05-01)
    A significant issue in vehicular ad hoc networks (VANETs) is the design of an effective broadcast scheme that can facilitate the fast and reliable dissemination of emergency warning messages in the vicinity of an unexpected ...
  • A Decentralized Approach for Self-Coexistence among Heterogeneous Networks in TVWS 

    Maloku, Hena; Hamiti, Enver; Limani, Zana; Lesta, Vicky Papadopoulou; Pitsillides, Andreas; Rajarajan, Muttukrishnan (2018-02-01)
    This paper focuses on coexistence and self-coexistence challenges between secondary heterogeneous wireless networks/users sharing TV Whitespace spectrum. The coexistence problems arise from having several primary and ...

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