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Black Hole

Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work.

Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES.

Joseph Silk

Emeritus Savilian Professor

Sub department

  • Astrophysics

Research groups

  • Beecroft Institute for Particle Astrophysics and Cosmology
joseph.silk@physics.ox.ac.uk
Telephone: 01865 (2)73300
Denys Wilkinson Building, room 532G
  • About
  • Publications

Composite star formation histories of early-type galaxies from minor mergers: prospects for WFC3

Monthly Notices of the Royal Astronomical Society 405:4 (2010) 2327-2338

Authors:

S Peirani, RM Crockett, S Geen, S Khochfar, S Kaviraj, J Silk

Abstract:

The star formation history of nearby early-type galaxies is investigated via numerical modelling. Idealized hydrodynamical N-body simulations with a star formation prescription are used to study the minor merger process (1/10 ≤ M1/M2 ≤ 1/4; M1 ≤ M2) between a giant galaxy (host) and a less massive spiral galaxy (satellite) with reasonable assumptions for the ages and metallicities of the merger progenitors. We find that the evolution of the star formation rate is extended over several dynamical times and shows peaks which correspond to pericentre passages of the satellite. The newly formed stars are mainly located in the central part of the satellite remnant while the older stars of the initial disc are deposited at larger radii in shell-like structures. After the final plunge of the satellite, star formation in the central part of the remnant can continue for several Gyr depending on the star formation efficiency. Although the mass fraction in new stars is small, we find that the half-mass radius differs from the half-light radius in the V and H bands. Moreover synthetic 2D images in J, H, NUV, Hβ and V bands, using the characteristic filters of the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope, reveal that residual star formation induced by gas-rich minor mergers can be clearly observed during and after the final plunge, especially in the near-ultraviolet band, for interacting systems at (z ≤ 0.023) over moderate numbers of orbits (approximately two orbits correspond to typical exposure times of ∼3600 s). This suggests that WFC3 has the potential to resolve these substructures, characterize plausible past merger episodes and give clues to the formation of early-type galaxies. © 2010 The Authors. Journal compilation © 2010 RAS.
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Planck pre-launch status: The Planck mission

ASTRONOMY & ASTROPHYSICS 520 (2010) ARTN A1

Authors:

JA Tauber, N Mandolesi, J-L Puget, T Banos, M Bersanelli, FR Bouchet, RC Butler, J Charra, G Crone, J Dodsworth, G Efstathiou, R Gispert, G Guyot, A Gregorio, JJ Juillet, J-M Lamarre, RJ Laureijs, CR Lawrence, HU Norgaard-Nielsen, T Passvogel, JM Reix, D Texier, L Vibert, A Zacchei, PAR Ade, N Aghanim, B Aja, E Alippi, L Aloy, P Armand, M Arnaud, A Arondel, A Arreola-Villanueva, E Artal, E Artina, A Arts, M Ashdown, J Aumont, M Azzaro, A Bacchetta, C Baccigalupi, M Baker, M Balasini, A Balbi, AJ Banday, G Barbier, RB Barreiro, M Bartelmann, P Battaglia, E Battaner, K Benabed, J-L Beney, R Beneyton, K Bennett, A Benoit, J-P Bernard, P Bhandari, R Bhatia, M Biggi, R Biggins, G Billig, Y Blanc, H Blavot, JJ Bock, A Bonaldi, R Bond, J Bonis, J Borders, J Borrill, L Boschini, F Boulanger, J Bouvier, M Bouzit, R Bowman, E Breelle, T Bradshaw, M Braghin, M Bremer, D Brienza, D Broszkiewicz, C Burigana, M Burkhalter, P Cabella, T Cafferty, M Cairola, S Caminade, P Camus, CM Cantalupo, B Cappellini, J-F Cardoso, R Carr, A Catalano, L Cayon, M Cesa, M Chaigneau, A Challinor, A Chamballu, JP Chambelland, M Charra, L-Y Chiang, G Chlewicki, PR Christensen, S Church, E Ciancietta, M Cibrario, R Cizeron, D Clements, B Collaudin, J-M Colley, S Colombi, A Colombo, F Colombo, O Corre, F Couchot, B Cougrand, A Coulais, P Couzin, B Crane, B Crill, M Crook, D Crumb, F Cuttaia, U Doerl, P da Silva, R Daddato, C Damasio, L Danese, G d'Aquino, O D'Arcangelo, K Dassas, RD Davies, W Davies, RJ Davis, P De Bernardis, D de Chambure, G de Gasperis, ML De la Fuente, P De Paco, A De Rosa, G De Troia, G De Zotti, M Dehamme, J Delabrouille, J-M Delouis, F-X Desert, G di Girolamo, C Dickinson, E Doelling, K Dolag, I Domken, M Douspis, D Doyle, S Du, D Dubruel, C Dufour, C Dumesnil, X Dupac, P Duret, C Eder, A Elfving, TA Ensslin, P Eng, K English, HK Eriksen, P Estaria, MC Falvella, F Ferrari, F Finelli, A Fishman, S Fogliani, S Foley, A Fonseca, G Forma, O Forni, P Fosalba, J-J Fourmond, M Frailis, C Franceschet, E Franceschi, S Francois, M Frerking, MF Gomez-Renasco, KM Gorski, TC Gaier, S Galeotta, K Ganga, J Garcia Lazaro, A Garnica, M Gaspard, E Gavila, M Giard, G Giardino, G Gienger, Y Giraud-Heraud, J-M Glorian, M Griffin, A Gruppuso, L Guglielmi, D Guichon, B Guillaume, P Guillouet, J Haissinski, FK Hansen, J Hardy, D Harrison, A Hazell, M Hechler, V Heckenauer, D Heinzer, R Hell, S Henrot-Versille, C Hernandez-Monteagudo, D Herranz, JM Herreros, V Hervier, A Heske, A Heurtel, SR Hildebrandt, R Hills, E Hivon, M Hobson, D Hollert, W Holmes, A Hornstrup, W Hovest, RJ Hoyland, G Huey, KM Huffenberger, N Hughes, U Israelsson, B Jackson, A Jaffe, TR Jaffe, T Jagemann, NC Jessen, J Jewell, W Jones, M Juvela, J Kaplan, P Karlman, F Keck, E Keihanen, M King, TS Kisner, P Kletzkine, R Kneissl, J Knoche, L Knox, T Koch, M Krassenburg, H Kurki-Suonio, A Lahteenmaki, G Lagache, E Lagorio, P Lami, J Lande, A Lange, F Langlet, R Lapini, M Lapolla, A Lasenby, M Le Jeune, JP Leahy, M Lefebvre, F Legrand, G Le Meur, R Leonardi, B Leriche, C Leroy, P Leutenegger, SM Levin, PB Lilje, C Lindensmith, M Linden-Vornle, A Loc, Y Longval, PM Lubin, T Luchik, I Luthold, JF Macias-Perez, T Maciaszek, C MacTavish, S Madden, B Maffei, C Magneville, D Maino, A Mambretti, B Mansoux, D Marchioro, M Maris, F Marliani, J-C Marrucho, J Marti-Canales, E Martinez-Gonzalez, A Martin-Polegre, P Martin, C Marty, W Marty, S Masi, M Massardi, S Matarrese, F Matthai, P Mazzotta, A McDonald, P McGrath, A Mediavilla, R Meinhold, J-B Melin, F Melot, L Mendes, A Mennella, C Mervier, L Meslier, M Miccolis, M-A Miville-Deschenes, A Moneti, D Montet, L Montier, J Mora, G Morgante, G Morigi, G Morinaud, N Morisset, D Mortlock, S Mottet, J Mulder, D Munshi, A Murphy, P Murphy, P Musi, J Narbonne, P Naselsky, A Nash, F Nati, P Natoli, B Netterfield, J Newell, M Nexon, C Nicolas, PH Nielsen, N Ninane, F Noviello, D Novikov, I Novikov, IJ O'Dwyer, P Oldeman, P Olivier, L Ouchet, CA Oxborrow, L Perez-Cuevas, L Pagan, C Paine, F Pajot, R Paladini, F Pancher, J Panh, G Parks, P Parnaudeau, B Partridge, B Parvin, JP Pascual, F Pasian, DP Pearson, T Pearson, M Pecora, O Perdereau, L Perotto, F Perrotta, F Piacentini, M Piat, E Pierpaoli, O Piersanti, E Plaige, S Plaszczynski, P Platania, E Pointecouteau, G Polenta, N Ponthieu, L Popa, G Poulleau, T Poutanen, G Prezeau, L Pradell, M Prina, S Prunet, JP Rachen, D Rambaud, F Rame, I Rasmussen, J Rautakoski, WT Reach, R Rebolo, M Reinecke, J Reiter, C Renault, S Ricciardi, P Rideau, T Riller, I Ristorcelli, JB Riti, G Rocha, Y Roche, R Pons, R Rohlfs, D Romero, S Roose, C Rosset, S Rouberol, M Rowan-Robinson, JA Rubino-Martin, P Rusconi, B Rusholme, M Salama, E Salerno, M Sandri, D Santos, JL Sanz, L Sauter, F Sauvage, G Savini, M Schmelzel, A Schnorhk, W Schwarz, D Scott, MD Seiffert, P Shellard, C Shih, M Sias, JI Silk, R Silvestri, R Sippel, GF Smoot, J-L Starck, P Stassi, J Sternberg, F Stivoli, V Stolyarov, R Stompor, L Stringhetti, D Strommen, T Stute, R Sudiwala, R Sugimura, R Sunyaev, J-F Sygnet, M Tuerler, E Taddei, J Tallon, C Tamiatto, M Taurigna, D Taylor, L Terenzi, S Thuerey, J Tillis, G Tofani, L Toffolatti, E Tommasi, M Tomasi, E Tonazzini, J-P Torre, S Tosti, F Touze, M Tristram, J Tuovinen, M Tuttlebee, G Umana, L Valenziano, D Vallee, M van der Vlis, F Van Leeuwen, J-C Vanel, B Van-Tent, J Varis, E Vassallo, C Vescovi, F Vezzu, D Vibert, P Vielva, J Vierra, F Villa, N Vittorio, C Vuerli, LA Wade, AR Walker, BD Wandelt, C Watson, D Werner, M White, SDM White, A Wilkinson, P Wilson, A Woodcraft, B Yoffo, M Yun, V Yurchenko, D Yvon, B Zhang, O Zimmermann, A Zonca, D Zorita
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A STUDY OF HIGH-ORDER NON-GAUSSIANITY WITH APPLICATIONS TO MASSIVE CLUSTERS AND LARGE VOIDS

ASTROPHYSICAL JOURNAL 724:1 (2010) 285-295

Authors:

Sirichai Chongchitnan, Joseph Silk
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A redshift survey towards the cosmic microwave background cold spot

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 404:1 (2010) L69-L73

Authors:

MN Bremer, J Silk, LJM Davies, MD Lehnert
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Active galactic nuclei activity: self-regulation from backflow

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 405:2 (2010) 1303-1314

Authors:

V Antonuccio-Delogu, Joseph Silk
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