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Browsing by Author "Lacy, M."
Now showing items 1-13 of 13
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The contribution of high-redshift galaxies to cosmic reionization : new results from deep WFC3 imaging of the Hubble Ultra Deep Field
Bunker, A.; Wilkins, S.; Ellis, R.S.; Stark, D.; Lorenzoni, S.; Chiu, K.; Lacy, M.; Jarvis, M.J.; Hickey, S. (2010)We have searched for star-forming galaxies at z≈ 7–10 by applying the Lyman-break technique to newly released Y-, J- and H-band images (1.1, 1.25 and 1.6 μm) from Wide Field Camera 3 (WFC3) on the Hubble Space Telescope. ... -
Deep spitzer observations of infrared-faint radio sources : high-redshift radio-loud active galactic nuclei?
Norris, R.P.; Afonso, J.; Cava, A.; Farrah, D.; Huynh, M.T.; Ivison, R.J.; Jarvis, M.J.; Lacy, M.; Mao, M.; Maraston, C.; Mauduit, J.C.; Middelberg, E.; Oliver, S.; Seymour, N.; Surace, J. (2011)Infrared-faint radio sources (IFRSs) are a rare class of objects which are relatively bright at radio wavelengths but very faint at infrared and optical wavelengths. Here we present sensitive near-infrared observations of ... -
The environments of z ~ 1 active galactic nuclei at 3.6 μm
Falder, J.; Stevens, J. A.; Jarvis, M.J.; Hardcastle, M.J.; Lacy, M.; McLure, R.J.; Hatziminaoglou, E.; Page, M.J.; Richards, G.T. (2010)We present an analysis of a large sample of active galactic nuclei (AGN) environments at z∼ 1 using stacked Spitzer data at 3.6 μm. The sample contains type 1 and type 2 AGN in the form of quasars and radio galaxies, and ... -
Evidence for a maximum jet efficiency for the most powerful radio galaxies
Fernandes, C.A.C.; Jarvis, M.J.; Rawlings, S.; Martinez-Sansigre, A.; Hatziminaoglou, E.; Lacy, M.; Page, M.J.; Stevens, Jason; Vardoulaki, E. (2011-03)We use new mid-infrared (mid-IR) photometry from the Spitzer Space Telescope to study the relations between low-frequency radio luminosity density L-nu 151 (MHz), mid-IR (12 mu m rest frame) luminosity nu L-nu 12 (mu m) ... -
Evidence that FeLoBALs may signify the transition between an ultraluminous infrared galaxy and a quasar
Farrah, D.; Lacy, M.; Priddey, R.; Borys, C.; Afonso, J. (2007) -
The obscuration by dust of most of the growth of supermassive black holes
Martinez-Sansigre, A.; Rawlings, S.; Lacy, M.; Fadda, D.; Marleau, F.; Simpson, C.; Willott, C.J.; Jarvis, M.J. (2005) -
On the redshift cut-off for steep-spectrum radio sources
Jarvis, M.J.; Rawlings, S.; Willott, C.J.; Blundell, K.M.; Eales, S.; Lacy, M. (2001) -
A population of high-redshift type-2 quasars-I. Selection criteria and optical spectra
Martinez-Sansigre, A.; Rawlings, S.; Lacy, M.; Fadda, D.; Jarvis, M.J.; Marleau, F.; Simpson, C.; Willott, C.J. (2006) -
Revolutionizing Our Understanding of AGN Feedback and its Importance to Galaxy Evolution in the Era of the Next Generation Very Large Array
Nyland, K.; Harwood, J. J.; Mukherjee, D.; Jagannathan, P.; Rujopakarn, W.; Emonts, B.; Alatalo, K.; Bicknell, G. V.; Davis, T. A.; Greene, J. E.; Kimball, A.; Lacy, M.; Lonsdale, Carol; Lonsdale, Colin; Maksym, W. P.; Molnár, D. C.; Morabito, L.; Murphy, E. J.; Patil, P.; Prandoni, I.; Sargent, M.; Vlahakis, C. (2018-05-18)Energetic feedback by active galactic nuclei (AGNs) plays an important evolutionary role in the regulation of star formation on galactic scales. However, the effects of this feedback as a function of redshift and galaxy ... -
A sample of 6C radio sources designed to find objects at redshift z>4: II - spectrophotometry and emission line properties
Jarvis, M.J.; Rawlings, S.; Lacy, M.; Blundell, K.M.; Bunker, A.; Eales, S.; Saunders, R.; Spinrad, H.; Stern, D.; Willott, C.J. (2001) -
The Spitzer Extragalactic Representative Volume Survey (SERVS) : Survey Definition and Goals
Mauduit, J.C.; Lacy, M.; Farrah, D.; Surace, J. A.; Jarvis, M.J.; Oliver, S.; Maraston, C.; Vaccari, M.; Marchetti, L.; Zeimann, G.; Gonzáles-Solares, E. A.; Pforr, J.; Petric, A. O.; Henriques, B.; Thomas, P. A.; Afonso, J.; Rettura, A.; Wilson, G.; Falder, J. T.; Geach, James; Huynh, M.; Norris, R. P.; Seymour, N.; Richards, G.T.; Stanford, S. A.; Alexander, D.M.; Becker, R.H.; Best, P.N.; Bizzocchi, L.; Bonfield, D.; Castro, N.; Cava, A.; Chapman, S.; Christopher, N.; Clements, D. L.; Covone, G.; Dubois, N.; Dunlop, J. S.; Dyke, E.; Edge, A.; Ferguson, H. C.; Foucaud, S.; Franceschini, A.; Gal, R. R.; Grant, J. K.; Grossi, M.; Hatziminaoglou, E.; Hickey, S.; Hodge, J. A.; Huang, J. S.; Ivison, R. J.; Kim, M.; LeFevre, O.; Lehnert, M.; Lonsdale, C.J.; Lubin, L. M.; McLure, R. J.; Messias, H.; Martínez-Sansigre, A.; Mortier, A. M. J.; Nielsen, D. M.; Ouchi, M.; Parish, G.; Perez-Fournon, I.; Pierre, M.; Rawlings, S.; Readhead, A.; Ridgway, S. E.; Rigopoulou, D.; Romer, A. K.; Rosebloom, I. G.; Rottgering, H.J.A.; Rowan-Robinson, M.; Sajina, A.; Simpson, C.J.; Smail, I.; Squires, G.K.; Stevens, J. A.; Taylor, R.; Trichas, M.; Urrutia, T.; van Kampen, E.; Verma, A.; Xu, C. K. (2012-08)We present the Spitzer Extragalactic Representative Volume Survey (SERVS), an 18 deg2 medium-deep survey at 3.6 and 4.5 μm with the postcryogenic Spitzer Space Telescope to ≈2 μJy (AB = 23.1) depth of five highly observed ... -
The spitzer extragalactic representative volume survey (SERVS) : the environments of high-z SDSS quasi-stellar-objects
Falder, J.; Stevens, J. A.; Jarvis, M.J.; Bonfield, David; Lacy, M.; Farrah, D.; Oliver, S.; Surace, J.; Mauduit, J.C.; Vaccari, M.; Marchetti, L.; Gonzalez-Solares, E.; Afonso, J.; Cava, A.; Seymour, N. (2011)This paper presents a study of the environments of SDSS quasi-stellar objects (QSOs) in the Spitzer Extragalactic Representative Volume Survey (SERVS). We concentrate on the high-redshift QSOs as these have not been studied ... -
Ultra steep spectrum radio sources in the Lockman Hole : SERVS identifications and redshift distribution at the faintest radio fluxes
Afonso, J.; Bizzocchi, L.; Ibar, E.; Grossi, M.; Simpson, C.; Chapman, S.; Jarvis, M.J.; Rottgering, H.; Norris, R. P.; Dunlop, J.; Ivison, R. J.; Messias, H.; Pforr, J.; Vaccari, M.; Seymour, N.; Best, P.; Gonzalez-Solares, E.; Farrah, D.; Fernandes, C. A. C.; Huang, J. -S.; Lacy, M.; Maraston, C.; Marchetti, L.; Mauduit, J. -C.; Oliver, S.; Rigopoulou, D.; Stanford, S. A.; Surace, J.; Zeimann, G. (2011-12-20)Ultra steep spectrum (USS) radio sources have been successfully used to select powerful radio sources at high redshifts (z greater than or similar to 2). Typically restricted to large-sky surveys and relatively bright radio ...