Publications


The halo mass function in the cosmic web

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2017) ARTN 012

F von Braun-Bates, HA Winther, D Alonso, J Devriendt


Lensing is low: cosmology, galaxy formation or new physics?

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467 (2017) 3024-3047

A Leauthaud, S Saito, S Hilbert, A Barreira, S More, M White, S Alam, P Behroozi, K Bundy, J Coupon, T Erben, C Heymans, H Hildebrandt, R Mandelbaum, L Miller, B Moraes, MES Pereira, SA Rodriguez-Torres, F Schmidt, H-Y Shan, M Viel, F Villaescusa-Navarro


Implications of strong intergalactic magnetic fields for ultrahigh-energy cosmic-ray astronomy

PHYSICAL REVIEW D 96 (2017) ARTN 023010

RA Batista, M-S Shin, J Devriendt, D Semikoz, G Sigl


KiDS-450: Testing extensions to the standard cosmological model

Monthly Notices of the Royal Astronomical Society 471 (2017) 1259-1279

S Joudaki, A Mead, C Blake, A Choi, J de Jong, T Erben, IF Conti, R Herbonnet, C Heymans, H Hildebrandt, H Hoekstra, B Joachimi, D Klaes, F Köhlinger, K Kuijken, J McFarland, L Miller, P Schneider, M Viola

© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. We test extensions to the standard cosmological model with weak gravitational lensing tomography using 450 deg 2 of imaging data from the Kilo Degree Survey (KiDS). In these extended cosmologies, which include massive neutrinos, non-zero curvature, evolving dark energy, modified gravity and running of the scalar spectral index, we also examine the discordance between KiDS and cosmic microwave background (CMB) measurements from Planck. The discordance between the two data sets is largely unaffected by a more conservative treatment of the lensing systematics and the removal of angular scales most sensitive to non-linear physics. The only extended cosmology that simultaneously alleviates the discordance with Planck and is at least moderately favoured by the data includes evolving dark energy with a time-dependent equation of state (in the form of the w 0 - w a parametrization). In this model, the respective constraints agree at the 1σ level, and there is 'substantial concordance' between the KiDS and Planck data sets when accounting for the full parameter space. Moreover, the Planck constraint on the Hubble constant is wider than in Λ cold dark matter (ΛCDM) and in agreement with the Riess et al. (2016) direct measurement of H 0 . The dark energy model is moderately favoured as compared to ΛCDM when combining the KiDS and Planck measurements, and marginalized constraints in the w 0 -w a plane are discrepant with a cosmological constant at the 3σ level. KiDS further constrains the sum of neutrino masses to 4.0 eV (95% CL), finds no preference for time or scale-dependent modifications to the metric potentials, and is consistent with flatness and no running of the spectral index.


Calibration of weak-lensing shear in the Kilo-Degree Survey

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467 (2017) 1627-1651

IF Conti, R Herbonnet, H Hoekstra, J Merten, L Miller, M Viola


CODEX weak lensing: Concentration of galaxy clusters at Z ~ 0.5

Monthly Notices of the Royal Astronomical Society 468 (2017) 1092-1116

N Cibirka, ES Cypriano, F Brimioulle, D Gruen, T Erben, L van Waerbeke, L Miller, A Finoguenov, C Kirkpatrick, J Patrick Henry, E Rykoff, E Rozo, R Dupke, JP Kneib, H Shan, P Spinelli

© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. We present a stacked weak-lensing analysis of 27 richness selected galaxy clusters at 0.40 ≤ z ≤ 0.62 in the COnstrain Dark Energy with X-ray galaxy clusters (CODEX) survey. The fields were observed in five bands with the Canada-France-Hawaii Telescope (CFHT). We measure the stacked surface mass density profile with a 14σ significance in the radial range 0.1 < R Mpc h -1 < 2.5. The profile is well described by the halo model, with the main halo term following a Navarro-Frenk-White profile (NFW) profile and including the off-centring effect. We select the background sample using a conservative colour-magnitude method to reduce the potential systematic errors and contamination by cluster member galaxies. We perform a Bayesian analysis for the stacked profile and constrain the best-fitting NFW parameters M 200c = 6.6 +1.0 -0.8 × 10 14 h -1 M⊙ and c 200c = 3.7 +0.7 -0.6 . The off-centring effect was modelled based on previous observational results found for redMaPPer Sloan Digital Sky Survey clusters. Our constraints on M 200c and c 200c allow us to investigate the consistency with numerical predictions and select a concentration-mass relation to describe the high richness CODEX sample. Comparing our best-fitting values forM 200c and C 200c with other observational surveys at different redshifts, we find no evidence for evolution in the concentration-mass relation, though it could be mitigated by particular selection functions. Similar to previous studies investigating the X-ray luminosity-mass relation, our data suggest a lower evolution than expected from self-similarity.


The XXL survey: First results and future

ASTRONOMISCHE NACHRICHTEN 338 (2017) 334-341

M Pierre, C Adami, M Birkinshaw, L Chiappetti, S Ettori, A Evrard, L Faccioli, F Gastaldello, P Giles, C Horellou, A Iovino, E Koulouridis, C Lidman, A Le Brun, B Maughan, S Maurogordato, I McCarthy, S Miyazaki, F Pacaud, S Paltani, M Plionis, T Reiprich, T Sadibekova, V Smolcic, S Snowden, J Surdej, M Tsirou, C Vignali, J Willis, S Alis, B Altieri, N Baran, C Benoist, A Bongiorno, M Bremer, A Butler, A Cappi, C Caretta, P Ciliegi, N Clerc, PS Corasaniti, J Coupon, J Delhaize, I Delvecchio, J Democles, S Desai, J Devriendt, Y Dubois, D Eckert, A Elyiv, A Farahi, C Ferraril, S Fotopoulou, W Forman, I Georgantopoulos, V Guglielmo, M Huynh, N Jerlin, C Jones, S Lavoie, J-P Le Fevre, M Lieu, M Kilbinger, F MaruIli, A Mantz, S McGee, J-B Melin, O Melnyk, L Moscardini, M Novak, E Piconcelli, B Poggianti, D Pomarede, E Pompei, T Ponman, MER Ceja, P Rana, D Rapetti, S Raychaudhury, M Ricci, H Rottgering, M Sahlen, J-L Sauvageot, C Schimd, M Sereno, GP Smith, K Umetsu, P Valageas, A Valotti, I Valtchanov, A Veropalumbo, B Ascaso, D Barnes, M De Petris, F Durret, M Donahue, M Ithana, M Jarvis, M Johnston-Hollitt, E Kalfountzou, S Kay, F La Franca, N Okabe, A Muzzin, A Rettura, F Ricci, J Ridl, G Risaliti, M Takizawa, P Thomas, N Truong


The Horizon-AGN simulation: evolution of galaxy properties over cosmic time

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467 (2017) 4739-4752

S Kaviraj, C Laigle, T Kimm, JEG Devriendt, Y Dubois, C Pichon, A Slyz, E Chisari, S Peirani


nIFTy cosmology: the clustering consistency of galaxy formation models

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 469 (2017) 749-762

A Pujol, RA Skibba, E Gaztanaga, A Benson, J Blaizot, R Bower, J Carretero, FJ Castander, A Cattaneo, SA Cora, DJ Croton, W Cui, D Cunnama, G De Lucia, JE Devriendt, PJ Elahi, A Font, F Fontanot, J Garcia-Bellido, ID Gargiulo, V Gonzalez-Perez, J Helly, BMB Henriques, M Hirschmann, A Knebe, J Lee, GA Mamon, P Monaco, J Onions, ND Padilla, FR Pearce, C Power, RS Somerville, C Srisawat, PA Thomas, E Tollet, CA Vega-Martinez, SK Yi


High Angular Momentum Halo Gas: A Feedback and Code-independent Prediction of LCDM

ASTROPHYSICAL JOURNAL 843 (2017) ARTN 47

KR Stewart, AH Maller, J Onorbe, JS Bullock, MR Joung, J Devriendt, D Ceverino, D Keres, PF Hopkins, C-A Faucher-Giguere


KiDS-450: The tomographic weak lensing power spectrum and constraints on cosmological parameters

Monthly Notices of the Royal Astronomical Society 471 (2017) 4412-4435

F Köhlinger, M Viola, B Joachimi, H Hoekstra, E van Uitert, H Hildebrandt, A Choi, T Erben, C Heymans, S Joudaki, D Klaes, K Kuijken, J Merten, L Miller, P Schneider, EA Valentijn

© 2017 The Authors. We present measurements of the weak gravitational lensing shear power spectrum based on 450 deg 2 of imaging data from the Kilo Degree Survey. We employ a quadratic estimator in two and three redshift bins and extract band powers of redshift autocorrelation and crosscorrelation spectra in the multipole range 76 ≤ ℓ ≤ 1310. The cosmological interpretation of the measured shear power spectra is performed in a Bayesian framework assuming a ΛCDM model with spatially flat geometry, while accounting for small residual uncertainties in the shear calibration and redshift distributions as well as marginalizing over intrinsic alignments, baryon feedback and an excess-noise power model. Moreover, massive neutrinos are included in the modelling. The cosmological main result is expressed in terms of the parameter combination yielding S 8 =0.651±0.058 (three z-bins), confirming the recently reported tension in this parameter with constraints from Planck at 3.2σ (three z-bins). We cross-check the results of the three z-bin analysis with the weaker constraints from the two z-bin analysis and find them to be consistent.


Feedback-regulated star formation and escape of LyC photons from mini-haloes during reionization

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 466 (2017) 4826-4846

T Kimm, H Katz, M Haehnelt, J Rosdahl, J Devriendt, A Slyz


The rise and fall of stellar across the peak of cosmic star formation history: effects of mergers versus diffuse stellar mass acquisition

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 465 (2017) 1241-1258

C Welker, Y Dubois, J Devriendt, C Pichon, S Kaviraj, S Peirani


KiDS-450: tomographic cross-correlation of galaxy shear with Planck lensing

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471 (2017) 1619-1633

J Harnois-Deraps, T Troster, NE Chisari, C Heymans, L van Waerbeke, M Asgari, M Bilicki, A Choi, T Erben, H Hildebrandt, H Hoekstra, S Joudaki, K Kuijken, J Merten, L Miller, N Robertson, P Schneider, M Viola


The third data release of the Kilo-Degree Survey and associated data products

Astronomy and Astrophysics 604 (2017)

JTA De Jong, GA Verdoes Kleijn, T Erben, H Hildebrandt, K Kuijken, G Sikkema, M Brescia, M Bilicki, NR Napolitano, V Amaro, KG Begeman, DR Boxhoorn, H Buddelmeijer, S Cavuoti, F Getman, A Grado, E Helmich, Z Huang, N Irisarri, F La Barbera, G Longo, JP McFarland, R Nakajima, M Paolillo, E Puddu, M Radovich, A Rifatto, C Tortora, EA Valentijn, C Vellucci, WJ Vriend, A Amon, C Blake, A Choi, IF Conti, SDJ Gwyn, R Herbonnet, C Heymans, H Hoekstra, D Klaes, J Merten, L Miller, P Schneider, M Viola

© ESO 2017. Context. The Kilo-Degree Survey (KiDS) is an ongoing optical wide-field imaging survey with the OmegaCAM camera at the VLT Survey Telescope. It aims to image 1500 square degrees in four filters (ugri). The core science driver is mapping the large-scale matter distribution in the Universe, using weak lensing shear and photometric redshift measurements. Further science cases include galaxy evolution, Milky Way structure, detection of high-redshift clusters, and finding rare sources such as strong lenses and quasars. Aims. Here we present the third public data release and several associated data products, adding further area, homogenized photometric calibration, photometric redshifts and weak lensing shear measurements to the first two releases. Methods. A dedicated pipeline embedded in the Astro-WISE information system is used for the production of the main release. Modifications with respect to earlier releases are described in detail. Photometric redshifts have been derived using both Bayesian template fitting, and machine-learning techniques. For the weak lensing measurements, optimized procedures based on the THELI data reduction and lensfit shear measurement packages are used. Results. In this third data release an additional 292 new survey tiles (≈300 deg 2 ) stacked ugri images are made available, accompanied by weight maps, masks, and source lists. The multi-band catalogue, including homogenized photometry and photometric redshifts, covers the combined DR1, DR2 and DR3 footprint of 440 survey tiles (44 deg 2 ). Limiting magnitudes are typically 24.3, 25.1, 24.9, 23.8 (5σ in a 20″ aperture) in ugri, respectively, and the typical r-band PSF size is less than 0.70″. The photometric homogenization scheme ensures accurate colours and an absolute calibration stable to ≈2% for gri and ≈3% in u. Separately released for the combined area of all KiDS releases to date are a weak lensing shear catalogue and photometric redshifts based on two different machine-learning techniques.


Developments in fibre-positioning technology for the WEAVE instrument at the William Herschel Telescope

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI 9908 (2016) ARTN 99087U

E Schallig, IJ Lewis, J Gilbert, G Dalton, M Brock, DC Abrams, K Middleton, JAL Aguerri, P Bonifacio, E Carrasco, SC Trager, A Vallenari


The WEAVE Focus Translation System: from Design to Construction

ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION II 9912 (2016) UNSP 99126D

M Canchado, A Romero, O Maroto, A Tomas, C Martin-Nuno, J Manel Casalta, J Prida, JAL Aguerri, J Miguel Herreros, J Miguel Delgado, J Alonso Burgal, D Carlos Abrams, K Dee, G Dalton, P Bonifacio, SC Trager, A Vallenari


First results of tests on the WEAVE Fibres

ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION II 9912 (2016) UNSP 991220

F Sayede, Y Younes, G Fasola, S Dorent, DC Abrams, JAL Aguerri, P Bonifacio, E Carrasco, G Dalton, K Dee, P Laporte, I Lewis, E Lhome, K Middleton, JH Pragt, J Rey, R Stuik, SC Trager, A Valenari


THE GLOBAL IMPLICATIONS OF THE HARD EXCESS. II. ANALYSIS OF THE LOCAL POPULATION OF RADIO-QUIET AGNs

ASTROPHYSICAL JOURNAL 818 (2016) ARTN 12

MM Tatum, TJ Turner, L Miller, JN Reeves, J DiLiello, J Gofford, A Patrick, M Clayton


Bursty star formation feedback and cooling outflows

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 462 (2016) 994-1001

T Suarez, A Pontzen, HV Peiris, A Slyz, J Devriendt

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