38 results on '"Waddington I"'
Search Results
2. Commentary
- Author
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Waddington, I
- Published
- 2002
3. The football club doctor system: Authors' reply
- Author
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Waddington, I and Roderick, M
- Published
- 2001
4. Methods of appointment and qualifications of club doctors and physiotherapists in English professional football: some problems and issues
- Author
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Waddington, I, Roderick, M, and Naik, R
- Published
- 2001
5. The discovery of a massive supercluster at z=0.9 in the UKIDSS DXS
- Author
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Swinbank, A. M., Edge, A., Smail, I., Stott, J., Bremer, M., Sato, Y., van Breukelen, C., Jarvis, M., Waddington, I., Clewley, L., Bergeron, J., Cotter, G., Dye, S., Geach, J., Gonzalez-Solares, E., Hirst, P., Ivison, R., Rawlings, S., Simpson, C., Smith, G. P., Verma, A., and Yamada, T.
- Subjects
Astrophysics (astro-ph) ,FOS: Physical sciences ,Astrophysics - Abstract
We analyse the first publicly released deep field of the UKIDSS Deep eXtragalactic Survey (DXS) to identify candidate galaxy over-densities at z~1 across ~1 sq. degree in the ELAIS-N1 field. Using I-K, J-K and K-3.6um colours we identify and spectroscopically follow-up five candidate structures with Gemini/GMOS and confirm they are all true over-densities with between five and nineteen members each. Surprisingly, all five structures lie in a narrow redshift range at z=0.89+/-0.01, although they are spread across 30Mpc on the sky. We also find a more distant over-density at z=1.09 in one of the spectroscopic survey regions. These five over-dense regions lying in a narrow redshift range indicate the presence of a supercluster in this field and by comparing with mock cluster catalogs from N-body simulations we discuss the likely properties of this structure. Overall, we show that the properties of this supercluster are similar to the well-studied Shapley and Hercules superclusters at lower redshift., Comment: In press at MNRAS, 11 pages, 5 figures
- Published
- 2016
6. Old elliptical galaxies at z similar to 1.5 and the Kormendy relation
- Author
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Waddington, I, Windhorst, RA, Cohen, SH, Dunlop, JS, Peacock, JA, Jimenez, R, McLure, RJ, Bunker, AJ, Spinrad, H, Dey, A, and Stern, D
- Subjects
Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
Deep spectroscopy of the two Leiden-Berkeley Deep Survey mJy radio galaxies LBDS 53W069 and 53W091 has previously shown them to have old (≳3 Gyr) stellar populations at z ≃ 1.5. Here we present the results of Hubble Space Telescope (HST) observations with the Wide Field and Planetary Camera 2 (WFPC2) in F814W and with the Near-Infrared Camera and Multi-Object Spectrograph (NICMOS) in F110W. We find that 53W069 has a de Vaucouleurs r1/4 profile in both the F814W and F110W data, with a mean effective radius of 0.30±0.06 arcsec (2.7±0.5 kpc). The rest-frame U - B colour gradient is consistent with that of present-day ellipticals, requiring a stellar population of supersolar (3 Z⊙) metallicity that formed on a very short time-scale at high redshift (z > 5). 53W091 has a regular r1/4 profile in F110W with an effective radius of 0.32 ± 0.08 arcsec (2.9 ± 0.7 kpc). The F814W profile is more extended and is consistent with the presence of a blue exponential disc that contributes 20 ± 10 per cent of the flux within re. We find a rest-frame U - B colour gradient that is significantly larger than that observed in field ellipticals at z ≤ 1, implying a stellar population of mixed metallicity (1-3 Z⊙) that formed in a high-redshift rapid burst. We have compared these two LBDS radio galaxies with the Kormendy relations often 3CR radio galaxies at z ≃ 0.8 and a sample of cluster ellipticals at z ∼ 0.4. The LBDS galaxies follow the Kormendy relation for the more radio-luminous 3CR galaxies, assuming passive evolution of their stellar populations, although they are smaller than the 3CR galaxies whose mean effective radius is 12 kpc. Their sizes and radio luminosities are consistent with scaling relations applied to the 3CR galaxies, in which both radio power and effective radius scale with galaxy mass. Compared with the sample of cluster ellipticals, 53W069 and 53W091 lie well within the scatter of the Kormendy relation. We conclude that the hosts of these millijansky radio sources at z ≃ 1.5 are passively evolving elliptical galaxies that will evolve into ordinary L* ellipticals by the present day.
- Published
- 2016
7. Ultraluminous Infrared Galaxies at 1.5<z<3 occupy dark matter haloes of mass ~6x10^13 solar masses
- Author
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Farrah, D., Lonsdale, C. J., Borys, C., Fang, F., Waddington, I., Oliver, S., Rowan-Robinson, M., Babbedge, T., Shupe, D., Polletta, M., Smith, H. E., and Surace, J.
- Subjects
Astrophysics - Abstract
We present measurements of the spatial clustering of ultraluminous infrared galaxies in two redshift intervals, 1.51. Adopting plausible models for the growth of DM haloes with redshift, then the haloes hosting the 2, Comment: ASP conference series. To appear in the conference proceedings for "At the edge of the Universe", Sintra, Portugal, October 2006. Six pages, one figure
- Published
- 2007
8. VVDS-SWIRE: Clustering evolution from a spectroscopic sample of galaxies with redshift 0.2<z<2.1 selected from Spitzer IRAC 3.6 micron and 4.5 micron photometry
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de la Torre, S., Fevre, O. Le, Arnouts, S., Guzzo, L., Farrah, D., Iovino, A., Lonsdale, C. J., Meneux, B., Oliver, S. J., Pollo, A., Waddington, I., Bottini, D., Fang, F., Garilli, B., Brun, V. Le, Maccagni, D., Picat, J. P., Scaramella, R., Scodeggio, M., Shupe, D., Surace, J., Tresse, L., Vettolani, G., Zanichelli, A., Adami, C., Bardelli, S., Bolzonella, M., Cappi, A., Charlot, S., Ciliegi, P., Contini, T., Foucaud, S., Franzetti, P., Gavignaud, I., Ilbert, O., Lamareille, F., McCracken, H. J., Marano, B., Marinoni, C., Mazure, A., Merighi, R., Paltani, S., Pello, R., Pozzetti, L., Radovich, M., Zamorani, G., Zucca, E., Bondi, M., Bongiorno, A., Brinchmann, J., Cucciati, O., Mellier, Y., Merluzzi, P., Temporin, S., Vergani, D., and Walcher, C. J.
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Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
By combining the VVDS with the SWIRE data, we have built the currently largest spectroscopic sample of galaxies selected in the rest-frame near-infrared. These allow us to investigate, for the first time using spectroscopic redshifts, the clustering evolution of galaxies selected from their rest-frame near-infrared luminosity in the redshift range 0.2, Comment: 11 pages, 8 figures. Accepted for publication in A&A
- Published
- 2007
9. XMM-LSS discovery of a z = 1.22 galaxy cluster
- Author
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Bremer, M. N., Valtchanov, I., Willis, J., Altieri, B., Andreon, S., Duc, P. A., Fang, F., Jean, C., Lonsdale, C., Pacaud, F., Pierre, M., Shupe, D. L., Surace, J. A., and Waddington, I.
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics::Galaxy Astrophysics ,Caltech Library Services - Abstract
We present details of the discovery of XLSS J022303.0−043622, a z= 1.2 cluster of galaxies. This cluster was identified from its X-ray properties and selected as a z > 1 candidate from its optical/near-infrared (IR) characteristics in the XMM Large-Scale Structure Survey (XMM-LSS). It is the most distant system discovered in the survey to date. We present ground-based optical and near-IR observations of the system carried out as part of the XMM-LSS survey. The cluster has a bolometric X-ray luminosity of 1.1 ± 0.7 × 10^44 erg s^−1 , fainter than most other known z > 1 X-ray selected clusters. In the optical it has a remarkably compact core, with at least a dozen galaxies inside a 125 kpc radius circle centred on the X-ray position. Most of the galaxies within the core, and those spectroscopically confirmed to be cluster members, have stellar masses similar to those of massive cluster galaxies at low redshift. They have colours comparable to those of galaxies in other z > 1 clusters, consistent with showing little sign of strong ongoing star formation. The bulk of the star formation within the galaxies appears to have ceased at least 1.5 Gyr before the observed epoch. Our results are consistent with massive cluster galaxies forming at z > 1 and passively evolving thereafter. We also show that the system is straightforwardly identified in Spitzer/IRAC 3.6- and 4.5-μm data obtained by the Spitzer Wide-area Infrared Extragalactic (SWIRE) survey emphasizing the power and utility of joint XMM and Spitzer searches for the most distant clusters.
- Published
- 2006
10. XMM-LSS discovery of a z=1.22 galaxy cluster
- Author
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Bremer, M. N., Valtchanov, I., Willis, J. P., Altieri, B., Andreon, S., Duc, P. A, Fang, F., Jean, C., Lonsdale, C., Pacaud, F., Pierre, M., Surace, J. A., Scupe, D. L., and Waddington, I.
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Astrophysics (astro-ph) ,FOS: Physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
We present details of the discovery of XLSSJ022303.0-043622, a z=1.2 cluster of galaxies. This cluster was identified from its X-ray properties and selected as a z>1 candidate from its optical/near-IR characteristics in the XMM Large-Scale Structure Survey (XMM-LSS). It is the most distant system discovered in the survey to date. We present ground-based optical and near IR observations of the system carried out as part of the XMM-LSS survey. The cluster has a bolometric X-ray luminosity of 1.1 +/- 0.7 x 10^44 erg/s, fainter than most other known z>1 X-ray selected clusters. In the optical it has a remarkably compact core, with at least a dozen galaxies inside a 125 kpc radius circle centred on the X-ray position. Most of the galaxies within the core, and those spectroscopically confirmed to be cluster members, have stellar masses similar to those of massive cluster galaxies at low redshift. They have colours comparable to those of galaxies in other z>1 clusters, consistent with showing little sign of strong ongoing star formation. The bulk of the star formation within the galaxies appears to have ceased at least 1.5 Gyr before the observed epoch. Our results are consistent with massive cluster galaxies forming at z>1 and passively evolving thereafter. We also show that the system is straightforwardly identified in Spitzer/IRAC 3.6 and 4.5 micron data obtained by the SWIRE survey emphasising the power and utility of joint XMM and Spitzer searches for the most distant clusters., 8 pages, 6 figures, MNRAS accepted
- Published
- 2006
11. Erratum:'The spatial clustering of ultraluminous infrared galaxies over 1.5 < z < 3' (ApJ 641, L17 [2006])
- Author
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Farrah, D, Lonsdale, C J, Borys, C, Waddington, I, Oliver, S, Rowan-Robinson, M, Babbedge, T, Shupe, D, Polletta, M, Smith, H E, and Surace, J
- Published
- 2006
12. The SCUBA Half-Degree Extragalactic Survey - I. Survey motivation, design and data processing
- Author
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Mortier, A. M. J., Serjeant, S., Dunlop, J. S., Scott, S. E., Ade, P., Alexander, D., Almaini, O., Aretxaga, I., Baugh, C., Benson, A. J., Best, P. N., Blain, A., Bock, J., Borys, C., Bressan, A., Carilli, C., Chapman, S., Clements, D. L., Coppin, K., Crawford, M., Devlin, M., Dicker, S., Dunne, L., Eales, S. A., Edge, A. C., Farrah, D., Fox, M., Frenk, C., Gaztanaga, E., Gear, W. K., Gonzales-Solares, E., Granato, G. L., Greve, T. R., Grimes, J. A., Gundersen, J., Halpern, M., Hargrave, P., Hughes, D. H., Ivison, R. J., Jarvis, M. J., Jenness, T., Jimenez, R., van, Kampen E., King, A., Lacey, C., Lawrence, A., Lepage, K., Mann, R. G., Marsden, G., Mauskopf, P., Netterfield, B., Oliver, S., Olmi, L., Page, M. J., Peacock, J. A., Pearson, C. P., Percival, W. J., Pope, A., Priddey, R. S., Rawlings, S., Roche, N., Rowan-Robinson, M., Scott, D., Seigar, M., Silva, L., Simpson, C., Smail, I., Stevens, J. A., Tucker, G., Vlahakis, C., Waddington, I., Wagg, J., Watson, M., Willott, C., Vaccari, M., Chapin, E. L., Sekiguchi, K., and Takagi, T.
- Subjects
Hubble Deep Field ,FOS: Physical sciences ,02 engineering and technology ,Astrophysics ,galaxies : interactions ,01 natural sciences ,Settore FIS/05 - Astronomia e Astrofisica ,0103 physical sciences ,Magellanic Clouds ,14. Life underwater ,Cluster analysis ,010303 astronomy & astrophysics ,QB ,Photometric redshift ,Physics ,methods : N-body simulations ,Data processing ,COSMIC cancer database ,Astrophysics (astro-ph) ,hydrodynamics ,Astronomy and Astrophysics ,021001 nanoscience & nanotechnology ,Galaxy ,Square degree ,Space and Planetary Science ,W. K. Gear ,0210 nano-technology ,Data reduction - Abstract
著者人数: 78名, Accepted: 2005-07-22, 資料番号: SA1003973000
- Published
- 2005
13. The Properties of Galaxies at z>5
- Author
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Bremer, M. N., Lehnert, M. D., Waddington, I., Hardcastle, M. J., Boyce, P. J., and Phillipps, S.
- Subjects
Astrophysics - Abstract
In a recent paper Lehnert & Bremer have photometrically selected a sample of galaxies at z>4.8 from a single VLT/FORS2 pointing and spectroscopically confirmed half of them to be at 4.828, i(AB)0) from the HST ACS images of the Chandra Deep Field South. This selection results in a sample of 44 sources from ~150 sq. arcmin. We find that such galaxies are often barely resolved in the ACS images, having half-light radii of 0.1-0.3 arcsec (0, which are generally galaxies of lower redshift. However, their distribution over the field is not uniform and their surface density varies considerably over areas comparable to a single 8m or HST pointing. The reliable determination of the surface and volume densities of such galaxies requires a sky area considerably larger than the current ACS imaging of this field. No individual z>5 candidate was detected to a 3-sigma limit of 6 x 10^-17 erg s^-1 cm^-2 at 0.5-5 keV by Chandra (a limiting luminosity of below 2 x 10^43 erg s^-1 at z~5.3). By summing over all positions, we find that the mean source must be undetected at a level at least a factor 4 times fainter than this. This rules out anything other than a weak AGN contribution to the emission from these objects and thus luminous AGN made little contribution to the final stages of re-ionization of the Universe.
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- 2003
14. Active Nuclei and Star-Forming Objects at z>2: Metallicities, Winds, and Formation Histories
- Author
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Keel, W. C., Wu, W., Waddington, I., Windhorst, R. A., and Pascarelle, S. M.
- Subjects
Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
We present near-IR observations of AGN and star-forming objects in the field of the radio galaxy 53W002 at z=2.39. The star-forming objects, of special interest as candidate protogalactic objects, are uniformly very blue in continuum slope, which fits with the strong Lyman alpha emission in indicating metallicity less than half solar. They fall in a range of luminosity and metallicity not populated by local objects. NICMOS spectroscopy detects [O III] emission for two objects and sets interesting limits for the rest. These data are satisfied by model stellar populations which have been forming stars for the last 2-5 million years. We see no evidence for older populations, either in broadband colors or as redder halos around the star-forming regions. These results suggest that the compact star-forming objects we see at z=2.0-2.5 are indeed early stages in the building of galaxies, rather than transient star-forming events in larger systems. They also also permit an alternative scheme, in which these low-mass systems are blowing winds rather than self-enriching, and should fade rapidly with cosmic epoch. For the three prominent AGN at z=2.39, emission-line ratios show metallicities just as high as in nearby systems. The "ionization cones" appear in [O III] and H lines, with continuum reflection in some cases as well. The contrast between the AGN and fainter star-forming objects can be broadly accomodated in a hierarchical formation picture, though there are still important unknowns as to the fate of the star-forming objects., Comment: 9 JPEG figures; accepted by the Astronomical Journal
- Published
- 2002
15. NICMOS Imaging of the Dusty Microjansky Radio Source VLA J123642+621331 at z = 4.424
- Author
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Waddington, I., Windhorst, R. A., Cohen, S. H., Partridge, R. B., Spinrad, H., and Stern, D.
- Subjects
Astrophysics (astro-ph) ,FOS: Physical sciences ,Astrophysics - Abstract
We present the discovery of a radio galaxy at a likely redshift of z = 4.424 in one of the flanking fields of the Hubble Deep Field. Radio observations with the VLA and MERLIN centered on the HDF yielded a complete sample of microjansky radio sources, of which about 20% have no optical counterpart to I < 25 mag. In this Letter, we address the possible nature of one of these sources, through deep HST NICMOS images in the F110W (J) and F160W (H) filters. VLA J123642+621331 has a single emission line at 6595-A, which we identify with Lyman-alpha at z = 4.424. We argue that this faint (H = 23.9 mag), compact (r = 0.2 arcsec), red (I - K = 2.0) object is most likely a dusty, star-forming galaxy with an embedded active nucleus., Accepted for publication in Astrophysical Journal Letters. 11 pages, 4 figures, uses aastex v5.0 and psfig
- Published
- 1999
16. A Complete Sample of Millijansky Radio Sources
- Author
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Waddington, I.
- Subjects
Astrophysics (astro-ph) ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Astrophysics ,Astrophysics::Galaxy Astrophysics - Abstract
The results of an optical and infrared investigation of a radio sample drawn from the 1.4 GHz Leiden-Berkeley Deep Survey are presented. This is believed to be the most comprehensive sample of radio sources at millijansky flux limits that is currently available. Optical counterparts have been identified for all but four sources in the two Hercules fields, and 80% of them are identified in the near-infrared. Redshifts have been obtained for 49 of the identified sources, and photometric redshifts were computed from the g,r,i,K data for the remaining 20. The general properties of the sample are summarized. The use of this sample in measuring the 1.4 GHz radio luminosity function is discussed. Finally, HST/NICMOS images of two old, red galaxies at z=1.5 are presented which show that both galaxies are dominated by an r^{1/4} profile with a scale-length of 5 kpc., To appear in "The Hy-Redshift Universe: Galaxy Formation and Evolution at High Redshift", UC Berkeley, June 1999, A. J. Bunker and W. J. M. van Breugel (eds), (ASP Conf. Series). LaTeX, 4 pages, 4 figures, uses paspconf.sty and epsf.sty
- Published
- 1999
17. Propagation of the Heaviest UH-Cosmic Ray Nuclei
- Author
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Waddington, I., Cummings, J. R., Garrard, T. L., Hink, P., Nilsen, B. S., and Potgieter, M. S.
- Subjects
Nuclear Theory ,Nuclear Experiment - Abstract
Our previous studies showed that the fragmentation cross sections of gold nuclei interacting in hydrogen have large variations between the values measured at 0.9 and 10.6 GeV/n, which has very significant implications on calculations of the propagation of the heaviest UH cosmic ray nuclei, such as Pb and Pt We have now completed a series of runs at the Brookhaven AGS using beams of gold nuclei of intermediate energy. The data from these runs will allow us to establish the excitation functions for these cross sections in a wide range of targets and hence model propagation more accurately than hitherto. In addition we will be able to study the energy dependence of nuclear charge pickup, electromagnetic dissociation and fission. Beams of gold nuclei with seven energies between 4.0 and 0.9 Ge V /n were studied interacting in targets ranging in mass from hydrogen to lead. We will present data on the cross sections derived from several of these beams and discuss some of the implications.
- Published
- 1997
18. The ADOX Experiment: mooring design and implementation. ADOX Technical Report 1991-1993
- Author
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Waddington, I.
- Published
- 1994
19. The SWINDEX Experiment: mooring design and implementation. SWINDEX Technical Report 1991-1993
- Author
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Waddington, I., Goy, K., Hartman, M., White, D., and Bonner, R.
- Published
- 1994
20. The SWALES Experiment: mooring design and implementation. Technical Report 1993
- Author
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Waddington, I. and Goy, K.
- Published
- 1994
21. Spectroscopic identifications of SWIRE sources in ELAIS-N1.
- Author
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Trichas, M., Rowan-Robinson, M., Georgakakis, A., Valtchanov, I., Nandra, K., Farrah, D., Morrison, G., Clements, D., and Waddington, I.
- Subjects
REDSHIFT ,GALAXIES ,QUASARS ,RADIO sources (Astronomy) ,ASTRONOMY - Abstract
We present the largest spectroscopic follow-up performed in SWIRE ELAIS-N1. We were able to determine redshifts for 289 extragalactic sources. The values of spectroscopic redshifts of the latter have been compared with the estimated values from our photometric redshift code with very good agreement between the two for both galaxies and quasars. Six of the quasars are hyperluminous infrared (IR) galaxies all of which are broad-line active galactic nuclei. We have performed emission-line diagnostics for 30 sources using the [O iii]/Hβ, [N ii]/Hα and [S ii]/Hα line ratios in order to classify these 30 sources into star forming, Seyferts, composite and LINER and compare the results to the predictions from our spectral energy distribution template fitting methods and mid-IR selection methods. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
22. The SCUBA Half-Degree Extragalactic Survey (SHADES) – VIII. The nature of faint submillimetre galaxies in SHADES, SWIRE and SXDF surveys.
- Author
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Clements, D. L., Vaccari, M., Babbedge, T., Oliver, S., Rowan-Robinson, M., Davoodi, P., Ivison, R., Farrah, D., Dunlop, J., Shupe, Dave, Waddington, I., Simpson, C., Furusawa, H., Serjeant, S., Afonso-Luis, A., Alexander, D. M., Aretxaga, I., Blain, A., Borys, C., and Chapman, S.
- Subjects
ASTRONOMY ,GALAXIES ,SCUBA apparatus ,SPECTRAL energy distribution ,SPECTRUM analysis ,ASTROPHYSICS ,PHYSICAL sciences - Abstract
We present the optical-to-submillimetre spectral energy distributions (SEDs) for 33 radio and mid-infrared (mid-IR) identified submillimetre galaxies discovered via the SHADES 850-μm SCUBA imaging in the Subaru- XMM Deep Field (SXDF). Optical data for the sources come from the SXDF and mid- and far-IR fluxes from SWIRE. We obtain photometric redshift estimates for our sources using optical and IRAC 3.6- and 4.5-μm fluxes. We then fit SED templates to the longer wavelength data to determine the nature of the far-IR emission that dominates the bolometric luminosity of these sources. The IR template fits are also used to resolve ambiguous identifications and cases of redshift aliasing. The redshift distribution obtained broadly matches previous results for submillimetre sources and on the SHADES SXDF field. Our template fitting finds that active galactic nuclei, while present in about 10 per cent of our sources, do not contribute significantly to their bolometric luminosity. Dust heating by starbursts, with either Arp220 or M82 type SEDs, appears to be responsible for the luminosity in most sources (23/33 are fitted by Arp220 templates, 2/33 by the warmer M82 templates). 8/33 sources, in contrast, are fitted by a cooler cirrus dust template, suggesting that cold dust has a role in some of these highly luminous objects. Three of our sources appear to have multiple identifications or components at the same redshift, but we find no statistical evidence that close associations are common among our SHADES sources. Examination of rest-frame K-band luminosity suggests that ‘downsizing’ is underway in the submillimetre galaxy population, with lower redshift systems lying in lower mass host galaxies. Of our 33 identifications six are found to be of lower reliability but their exclusion would not significantly alter our conclusions. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
23. Clustering of galaxies at 3.6 μm in the Spitzer Wide-area Infrared Extragalactic legacy survey.
- Author
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Waddington, I., Oliver, S. J., Babbedge, T. S. R., Fang, F., Farrah, D., Franceschini, A., Gonzalez-Solares, E. A., Lonsdale, C. J., Rodighiero, G., Rowan-Robinson, M., Shupe, D. L., Surace, J. A., Vaccari, M., and Xu, C. K.
- Subjects
- *
GALAXIES , *CLUSTER theory (Nuclear physics) , *EXTRAGALACTIC distances , *ASTRONOMICAL photometry , *METEOROLOGICAL optics , *REDSHIFT - Abstract
We investigate the clustering of galaxies selected in the 3.6 μm band of the Spitzer Wide-area Infrared Extragalactic (SWIRE) legacy survey. The angular two-point correlation function is calculated for 11 samples with flux limits of S3.6≥ 4–400 μJy, over an 8 deg2 field. The angular clustering strength is measured at >5σ significance at all flux limits, with amplitudes of A= (0.49–29) × 10−3 at 1°, for a power-law model, Aθ−0.8. We estimate the redshift distributions of the samples using phenomological models, simulations and photometric redshifts, and so derive the spatial correlation lengths. We compare our results with the Galaxies In Cosmological Simulations (GalICS) models of galaxy evolution and with parametrized models of clustering evolution. The GalICS simulations are consistent with our angular correlation functions, but fail to match the spatial clustering inferred from the phenomological models or the photometric redshifts. We find that the uncertainties in the redshift distributions of our samples dominate the statistical errors in our estimates of the spatial clustering. At low redshifts (median z≤ 0.5), the comoving correlation length is approximately constant, Mpc, and then decreases with increasing redshift to a value of 2.9 ± 0.3 h−1 Mpc for the faintest sample, for which the median redshift is z∼ 1. We suggest that this trend can be attributed to a decrease in the average galaxy and halo mass in the fainter flux-limited samples, corresponding to changes in the relative numbers of early- and late-type galaxies. However, we cannot rule out strong evolution of the correlation length over . [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
24. The discovery of a massive supercluster at.
- Author
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Swinbank, A. M., Edge, A. C., Smail, Ian, Stott, J. P., Bremer, M., Sato, Y., van Breukelen, C., Jarvis, M., Waddington, I., Clewley, L., Bergeron, J., Cotter, G., Dye, S., Geach, J. E., Gonzalez-Solares, E., Hirst, P., Ivison, R. J., Rawlings, S., Simpson, C., and Smith, G. P.
- Subjects
SUPERCLUSTERS ,STAR clusters ,REDSHIFT ,SPECTRUM analysis ,SPECTROGRAPHS ,SURVEYS - Abstract
We analyse the first publicly released deep field of the UK Infrared Deep Sky Survey (UKIDSS) Deep eXtragalactic Survey to identify candidate galaxy overdensities at across ∼1 deg
2 in the ELAIS-N1 field. Using and colours, we identify and spectroscopically follow up five candidate structures with Gemini/Gemini Multi-Object Spectrograph and confirm that they are all true overdensities with between five and 19 members each. Surprisingly, all five structures lie in a narrow redshift range at , although they are spread across 30 Mpc on the sky. We also find a more distant overdensity at in one of the spectroscopic survey regions. These five overdense regions lying in a narrow redshift range indicate the presence of a supercluster in this field and by comparing with mock cluster catalogues from N-body simulations we discuss the likely properties of this structure. Overall, we show that the properties of this supercluster are similar to the well-studied Shapley and Hercules superclusters at lower redshift. [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
25. XMM-LSS discovery of a.
- Author
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Bremer, M. N., Valtchanov, I., Willis, J., Altieri, B., Andreon, S., Duc, P. A., Fang, F., Jean, C., Lonsdale, C., Pacaud, F., Pierre, M., Shupe, D. L., Surace, J. A., and Waddington, I.
- Subjects
GALAXY clusters ,X-rays ,ASTRONOMICAL spectroscopy ,STAR formation ,REDSHIFT - Abstract
We present details of the discovery of XLSS J022303.0−043622, a cluster of galaxies. This cluster was identified from its X-ray properties and selected as a candidate from its optical/near-infrared (IR) characteristics in the XMM Large-Scale Structure Survey ( XMM-LSS). It is the most distant system discovered in the survey to date. We present ground-based optical and near-IR observations of the system carried out as part of the XMM-LSS survey. The cluster has a bolometric X-ray luminosity of , fainter than most other known X-ray selected clusters. In the optical it has a remarkably compact core, with at least a dozen galaxies inside a 125 kpc radius circle centred on the X-ray position. Most of the galaxies within the core, and those spectroscopically confirmed to be cluster members, have stellar masses similar to those of massive cluster galaxies at low redshift. They have colours comparable to those of galaxies in other clusters, consistent with showing little sign of strong ongoing star formation. The bulk of the star formation within the galaxies appears to have ceased at least 1.5 Gyr before the observed epoch. Our results are consistent with massive cluster galaxies forming at and passively evolving thereafter. We also show that the system is straightforwardly identified in Spitzer/IRAC 3.6- and 4.5-μm data obtained by the Spitzer Wide-area Infrared Extragalactic (SWIRE) survey emphasizing the power and utility of joint XMM and Spitzer searches for the most distant clusters. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
26. Optical and infrared diagnostics of SDSS galaxies in the SWIRE survey.
- Author
-
Davoodi, P., Pozzi, F., Oliver, S., Polletta, M., Afonso-Luis, A., Farrah, D., Hatziminaoglou, E., Rodighiero, G., Berta, S., Waddington, I., Lonsdale, C., Rowan-Robinson, M., Shupe, D. L., Evans, T., Fang, F., Smith, H. E., and Surace, J.
- Subjects
GALAXIES ,ACTIVE galactic nuclei ,OPACITY (Optics) ,INFRARED astronomy ,STARS - Abstract
We present the rest-frame optical and infrared colours of a complete sample of galaxies from the Spitzer Wide-Area Infrared Extragalactic (SWIRE) Legacy Survey and the Sloan Digital Sky Survey (SDSS). We discuss the optical and infrared colours of our sample and analyse in detail the contribution of dusty star-forming galaxies and active galactic nuclei (AGN) to optically selected red sequence galaxies. We propose that the optical colour and infrared colour of galaxies in our sample are determined primarily by a bulge-to-disc ratio. The colour is found to be sensitive to the bulge-to-disc ratio for disc-dominated galaxies, whereas the colour is more sensitive for bulge-dominated systems. We identify ∼18 per cent (195 sources) of our sample as having red optical colours and infrared excess. Typically, the infrared luminosities of these galaxies are found to be at the high end of star-forming galaxies with blue optical colours. Using emission-line diagnostic diagrams, 78 are found to have an AGN contribution and 117 are identified as star-forming systems. The red colour of the star-forming galaxies could be explained by extinction. However, their high optical luminosities cannot. We conclude that they have a significant bulge component. The number densities of optically red star-forming galaxies are found to correspond to ∼13 per cent of the total number density of our sample. In addition, these systems contribute ∼13 per cent of the total optical luminosity density, and 28 per cent of the total infrared luminosity density of our SWIRE/SDSS sample. These objects may reduce the need for ‘dry mergers’. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
27. Old elliptical galaxies at <MATH>z = 1.5</MATH> and the Kormendy relation.
- Author
-
Waddington, I., Windhorst, R. A., Cohen, S. H., Dunlop, J. S., Peacock, J. A., Jimenez, R., McLure, R. J., Bunker, A. J., Spinrad, H., Dey, A., and Stern, D.
- Subjects
- *
RADIO galaxies , *ELLIPTICAL galaxies , *ACTIVE galaxies - Abstract
Deep spectroscopy of the two Leiden-Berkeley Deep Survey mJy radio galaxies LBDS 53W069 and 53W091 has previously shown them to have old (≥3 Gyr) stellar populations at z ... 1.5. Here we present the results of Hubble Space Telescope (HST) observations with the Wide Field and Planetary Camera 2 (WFPC2) in F814W and with the Near-Infrared Camera and Multi-Object Spectrograph (NICMOS) in F110W. We find that 53W069 has a de Vaucouleurs r[sup 1/4] profile in both the F814W and F110W data, with a mean effective radius of 0.30 ± 0.06 arcsec (2.7 ± 0.5 kpc). The rest-frame U - B colour gradient is consistent with that of present-day ellipticals, requiring a stellar population of supersolar (3 Z...) metallicity that formed on a very short time-scale at high redshift (z > 5). 53W091 has a regular r[sup 1/4] profile in F110W with an effective radius of 0.32 ± 0.08 arcsec (2.9 ± 0.7 kpc). The F814W profile is more extended and is consistent with the presence of a blue exponential disc that contributes 20 ± 10 per cent of the flux within re. We find a rest-frame U - B colour gradient that is significantly larger than that observed in field ellipticals at z ≤ 1, implying a stellar population of mixed metallicity (1-3 Z...) that formed in a high-redshift rapid burst. We have compared these two LBDS radio galaxies with the Kormendy relations of ten 3CR radio galaxies at z ... 0.8 and a sample of cluster ellipticals at z ... 0.4. The LBDS galaxies follow the Kormendy relation for the more radio-luminous 3CR galaxies, assuming passive evolution of their stellar populations, although they are smaller than the 3CR galaxies whose mean effective radius is 12 kpc. Their sizes and radio luminosities are consistent with scaling relations applied to the 3CR galaxies, in which both radio power and effective radius scale with galaxy mass. Compared with the sample of cluster ellipticals, 53W069 and 53W091 lie well within the scatter of the Kormendy... [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
28. The LBDS Hercules sample of mJy radio sources at 1.4GHz--II. Redshift distribution, radio luminosity function, and the high-redshift cut-off.
- Author
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Waddington, I., Dunlop, J.S., Peacock, J.A., and Windhorst, R.A
- Subjects
- *
RADIO sources (Astronomy) , *REDSHIFT , *SPECTRUM analysis - Abstract
Focuses on the use of spectroscopy and broad-band photometric redshifts on the distribution of Hercules sample of millijansky radio sources. Evolution of luminosity functions; Measurement of the steep-spectrum quasars; Observation of the stellar structure.
- Published
- 2001
- Full Text
- View/download PDF
29. The LBDS Hercules sample of mJy radio sources at 1.4 GHz – I. Multicolour photometry.
- Author
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Waddington, I., Windhorst, R.A., Dunlop, J.S., Koo, D.C., and Peacock, J.A.
- Subjects
- *
INFRARED imaging , *RADIO sources (Astronomy) , *REDSHIFT - Abstract
The results are presented of an extensive programme of optical and infrared imaging of radio sources in a complete subsample of the Leiden–Berkeley Deep Survey. The LBDS Hercules sample consists of 72 sources observed at 1.4 GHz, with flux densities S[sub 1.4]⩾1.0 mJy, in a 1.2 deg[sup 2] region of Hercules. This sample is almost completely identified in the g, r, i and K bands, with some additional data available at J and H. The magnitude distributions peak at r≃22 mag, K≃16 mag and extend down to r≃26 mag, K≃21 mag. The K-band magnitude distributions for the radio galaxies and quasars are compared with those of other radio surveys. At S[sub 1.4 GHz]≲1 Jy, the K-band distribution does not change significantly with radio flux density. The sources span a broad range of colours, with several being extremely red (r-K≳6). Though small, this is the most optically complete sample of mJy radio sources available at 1.4 GHz, and is ideally suited for studying the evolution of the radio luminosity function out to high redshifts. [ABSTRACT FROM AUTHOR]
- Published
- 2000
- Full Text
- View/download PDF
30. NICMOS Imaging of the Dusty Microjansky Radio Source VLA J123642+621331 at z = 4.424Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555 and with the W. M. Keck Observatory, which is operated as a scientific partnership among the University of California, the California Institute of Technology, and NASA, made possible by the generous financial support of the W. M. Keck Foundation.
- Author
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Waddington, I., Windhorst, R. A., Cohen, S. H., Partridge, R. B., Spinrad, H., and Stern, D.
- Published
- 1999
- Full Text
- View/download PDF
31. Drifting spar buoy current and temperature measurements made during RRS Discovery Cruises 145 and 146
- Author
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Pollard, R.T., Waddington, I., Browne, K., and Sherrocks, K.
- Published
- 1987
32. Optical Morphologies of Millijansky Radio Galaxies Observed by the Hubble Space Telescope and in the Very Large Array FIRST Survey.
- Author
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Russell, J., Ryan, Jr., R. E., Cohen, S. H., Windhorst, R. A., and Waddington, I.
- Published
- 2008
- Full Text
- View/download PDF
33. The properties of Lyman break galaxies at.
- Author
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Bremer, M.N., Lehnert, M.D., Waddington, I., Hardcastle, M.J., Boyce, P.J., and Phillipps, S.
- Subjects
GALAXIES ,ASTRONOMICAL photometry ,HYDROGEN ,NEUTRAL beams ,REDSHIFT ,SPACE environment - Abstract
In a recent paper, Lehnert & Bremer have photometrically selected a sample of Lyman break galaxies at from a single VLT/FORS2 pointing and spectroscopically confirmed half of them to be at . To study the properties of such galaxies further, we have photometrically selected a similar sample from the Hubble Space Telescope Advanced Camera for Surveys ( HST ACS) images of the Chandra Deep Field-South. This selection results in a sample of 44 sources from . We find that such galaxies are often barely resolved in the ACS images, having half-light radii of 0.1–0.3 arcsec (<2 kpc). They show no difference in spatial clustering from sources selected by , which are generally galaxies of lower redshift. However, their distribution over the field is not uniform and their surface density varies considerably over areas comparable to a single 8-m or HST pointing. A reliable determination of the surface and volume densities of such galaxies requires a sky area considerably larger than the current ACS imaging of this field. No individual Lyman break candidate was detected to a 3σ limit of at 0.5–5 keV by Chandra (a limiting luminosity of below at ). By summing over all positions, we find that the mean source must be undetected at a level at least a factor of 4 times fainter than this. This rules out anything other than a weak active galactic nucleus (AGN) contribution to the emission from these objects; we conclude that luminous AGNs made little contribution to the final stages of re-ionization of the Universe. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
34. Author's reply.
- Author
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Waddington, I. and Roderick, M.
- Subjects
- *
LETTERS to the editor , *SPORTS physicians - Abstract
Presents a response by I. Waddington and M. Roderick to a letter to the editor about their article "Methods of Appointing and Qualifications of Club Doctors and Physiotherapists in English Professional Football: Some Problems and Issues," in vol. 35, 2001 issue.
- Published
- 2001
35. 'Strict Liability' and legal rights: Nutritional Supplements, 'Intent' and 'Risk' in the Parallel world of WADA
- Author
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McArdle, David, Moller, V, Waddington, I, and Hoberman, JM
- Abstract
First paragraph: Much of the discussion about the legal relationship between athletes and anti-doping regimes has focussed on the application of what is invariably, although somewhat loosely, referred to as the ‘strict liability principle’, and this paper is concerned with the application of this principle in the context of nutritional supplement use (for more general discussion of its application see Charlish, 2012; Anderson, 2013). The principle’s significance lie in the fact that domestic courts worldwide (for example those of England and Wales in Korda v ITF, The Times 4 February 1999), the Court of Justice of the European Union (Meca-Medina v Commission [2006] 5 CMLR 18) and the Court of Arbitration for Sport (USA Shooting and Quigley v Union Internationale de Tir CAS 94/129) have accepted that the relationship between an athlete and the governing body is contractual and that even if there is no written agreement between the parties, the existence of that contract can be discerned from the parties’ dealings with one another. As part of this contractual relationship, athletes are deemed to have accepted the provisions of the WADA Code, both in terms of the substantive provisions of what substances are banned and the sanctions that can be imposed for violation of the rules. The procedural provisions that deal with the conduct of anti-doping tribunals and the potential right of appeal to the CAS are also incorporated into this contract.
- Published
- 2015
36. The movement towards the professionalization of medicine.
- Author
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Waddington I
- Subjects
- Education, Medical history, Ethics, Medical history, Medicine in the Arts, Paintings history, United Kingdom, History, 19th Century, Physicians history
- Published
- 1990
- Full Text
- View/download PDF
37. The development of medical ethics -a sociological analysis.
- Author
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Waddington I
- Subjects
- Codes of Ethics, England, History, 18th Century, History, 19th Century, Societies, Medical history, Ethics, Medical history
- Published
- 1975
- Full Text
- View/download PDF
38. The struggle to reform the Royal College of Physicians, 1767-1771: a sociological analysis.
- Author
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Waddington I
- Subjects
- Accreditation, Family Practice history, London, Scotland, Sociology history, History, 18th Century, Societies, Medical history
- Published
- 1973
- Full Text
- View/download PDF
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