Now showing items 1-10 of 10

    • A dust-enshrouded tidal disruption event with a resolved radio jet in a galaxy merger 

      Mattila, Seppo S.; Pérez-Torres, M. A.; Efstathiou, Andreas; Mimica, Petar; Fraser, Morgan; Kankare, Erkki; Alberdi, A.; Aloy, Miguel Ángel; Heikkilä, T.; Jonker, Peter G.; Lundqvist, Peter; Marti-Vidal, Ivan; Meikle, W. P.S.; Romero-Cañizales, Cristina; Smartt, Stephen J.; Tsygankov, Sergey S.; Varenius, Eskil; Alonso-Herrero, Almudena; Bondi, Marco; Fransson, Claes; Herrero-Illana, Rubén; Kangas, Tuomas; Kotak, Rubina; Ramírez-Olivencia, N.; Väisänen, Petri H.; Beswick, Robert J.; Clements, David L.; Greimel, Robert; Harmanen, Jussi; Kotilainen, Jari K.; Nandra, Kirpaul P.; Reynolds, Thomas M.; Ryder, Stuart D.; Walton, Nicholas A.; Wiik, Kaj J. (2018-08-03)
      Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of a supermassive black hole (SMBH). We have observed a transient source in the western nucleus of the ...
    • Adaptive optics discovery of supernova 2004ip in the nuclear regions of the luminous infrared galaxy IRAS 18293-3413 

      Mattila, Seppo; Väisänen, Petri H.; Farrah, Duncan G.; Efstathiou, Andreas; Meikle, W. P.S.; Dahlén, Tomas; Fransson, Claes; Lira, Paulina; Lundqvist, Peter; Östlin, Göran; Ryder, Stuart D.; Sollerman, Jesper (2007-04-10)
      We report a supernova discovery in Ks-band images from the NAOS CONICA adaptive optics (AO) system on the ESO Very Large Telescope. The images were obtained as part of a near-infrared search for highly obscured supernovae ...
    • Adaptive optics imaging and optical spectroscopy of a multiple merger in a luminous infrared galaxy 

      Väisänen, Petri H.; Mattila, Seppo S.; Kniazev, A.; Adamo, Angela; Efstathiou, Andreas; Farrah, Duncan G.; Johansson, Peter H.; Östlin, Göran; Buckley, David A.H.; Burgh, Eric B.; Crause, Lisa A.; Hashimoto, Yasuhiro; Lira, Paulina; Loaring, Nicola S.; Nordsieck, Kenneth H.; Romero-Colmenero, Encarni; Ryder, Stuart D.; Still, Martin D.; Albert A. Zijlstra, Albert (2008-03-01)
      We present near-infrared (NIR) adaptive optics imaging obtained with VLT/NACO and optical spectroscopy from the Southern African Large Telescope of a luminous IR galaxy (LIRG) IRAS 19115-2124. These data are combined with ...
    • Core-collapse supernovae missed by optical surveys 

      Mattila, Seppo S.; Dahlén, Tomas; Efstathiou, Andreas; Kankare, Erkki; Melinder, Jens; Alonso-Herrero, Almudena; Pérez-Torres, M. A.; Ryder, Stuart D.; Väisänen, Petri H.; Östlin, Göran (2012-09-10)
      We estimate the fraction of core-collapse supernovae (CCSNe) that remain undetected by optical SN searches due to obscuration by large amounts of dust in their host galaxies. This effect is especially important in luminous ...
    • Discovery of a very highly extinguished supernova in a luminous infrared galaxy 

      Kankare, Erkki; Mattila, Seppo S.; Ryder, Stuart D.; Pérez-Torres, M. A.; Alberdi, A.; Romero-Cañizales, Cristina; Díaz-Santos, Tanio; Väisänen, Petri H.; Efstathiou, Andreas; Alonso-Herrero, Almudena; Colina, Luis; Kotilainen, Jari K. (2008-01-01)
      We report the discovery of a confirmed supernova (SN) and a supernova candidate in near-infrared images from the ALTAIR/NIRI adaptive optics system on the Gemini-North Telescope and NICMOS on the Hubble Space Telescope. ...
    • Discovery of two supernovae in the nuclear regions of the luminous infrared galaxy IC 883 

      Kankare, Erkki; Mattila, Seppo S.; Ryder, Stuart D.; Väisänen, Petri H.; Alberdi, A.; Alonso-Herrero, Almudena; Colina, Luis; Efstathiou, Andreas; Kotilainen, Jari K.; Melinder, Jens; Pérez-Torres, M. A.; Romero-Cãizales, C.; Takalo, A. (2012-01-10)
      We report the discovery of two consecutive supernovae (SNe), 2010cu and 2011hi, located at 037 (180pc) and 079 (380pc) projected distance, respectively, from the center of the K-band nucleus of the luminous infrared galaxy ...
    • E-MERLIN and VLBI observations of the luminous infrared galaxy IC 883: A nuclear starburst and an AGN candidate revealed 

      Romero-Cañizales, Cristina; Pérez-Torres, M. A.; Alberdi, A.; Argo, Megan K.; Beswick, Robert J.; Kankare, Erkki; Batejat, Fabien; Efstathiou, Andreas; Mattila, Seppo S.; Conway, John E.; Garrington, Simon T.; Muxlow, Thomas W.B.; Ryder, Stuart D.; Väisänen, Petri H. (2012-07-05)
      Context. The high star formation rates of luminous infrared galaxies (LIRGs) make them ideal places for core-collapse supernova (CCSN) searches. Massive star formation can often be found in coexistence with an active ...
    • First results from GeMS/GSAOI for project SUNBIRD: Supernovae UNmasked by Infra-Red Detection 

      Kool, Erik C.; Ryder, Stuart D.; Kankare, Erkki; Mattila, Seppo S.; Reynolds, Thomas M.; McDermid, Richard M.; Pérez-Torres, M. A.; Herrero-Illana, Rubén; Schirmer, Mischa; Efstathiou, Andreas; Bauer, Franz E.; Kotilainen, Jari K.; Väisänen, Petri H.; Baldwin, C.; Romero-Cañizales, Cristina; Alberdi, A. (2018-01-01)
      Core collapse supernova (CCSN) rates suffer from large uncertainties as many CCSNe exploding in regions of bright background emission and significant dust extinction remain unobserved. Such a shortfall is particularly ...
    • Star formation and AGN activity in a sample of local luminous infrared galaxies through multiwavelength characterization 

      Herrero-Illana, Rubén; Pérez-Torres, M. A.; Randriamanakoto, Zara; Alberdi, A.; Efstathiou, Andreas; Väisänen, Petri H.; Kankare, Erkki; Kool, Erik C.; Mattila, Seppo S.; Ramphul, Rajin; Ryder, Stuart D. (2017-01-01)
      Nuclear starbursts and active galactic nucleus (AGN) activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In this paper, we ...
    • Unveiling the AGN in IC 883: Discovery of a parsec-scale radio jet 

      Romero-Cañizales, Cristina; Alberdi, A.; Ricci, Claudio; Arévalo, Patricia; Pérez-Torres, M. A.; Conway, John E.; Beswick, Robert J.; Bondi, Marco; Muxlow, Thomas W.B.; Argo, Megan K.; Bauer, Franz E.; Efstathiou, Andreas; Herrero-Illana, Rubén; Mattila, Seppo S.; Ryder, Stuart D. (2017-01-01)
      IC 883 is a luminous infrared galaxy (LIRG) classified as a starburst-active galactic nucleus (AGN) composite. In a previous study, we detected a low-luminosity AGN (LLAGN) radio candidate. Here, we report on our radio ...