Search Publications
NuSTAR catches the unveiling nucleus of NGC 1068
Harrison, F. A.; Stern, D.; Alexander, D. M. +15 more
We present a NuSTAR and XMM-Newton monitoring campaign in 2014/2015 of the Compton-thick Seyfert 2 galaxy, NGC 1068. During the 2014 August observation, we detect with NuSTAR a flux excess above 20 keV (32 ± 6 per cent) with respect to the 2012 December observation and to a later observation performed in 2015 February. We do not detect any spectra…
Interstellar extinction curve variations towards the inner Milky Way: a challenge to observational cosmology
Valenti, Elena; Wolf, Christian; Udalski, Andrzej +18 more
We investigate interstellar extinction curve variations towards ∼4 deg2 of the inner Milky Way in VIJKs photometry from the OGLE-III (third phase of the Optical Gravitational Lensing Experiment) and VVV (VISTA Variables in the Via Lactea) surveys, with supporting evidence from diffuse interstellar bands and F435W, F625W photo…
The GHOSTS survey - II. The diversity of halo colour and metallicity profiles of massive disc galaxies
Bell, Eric F.; Monachesi, Antonela; Radburn-Smith, David J. +5 more
We study the stellar halo colour properties of six nearby massive highly inclined disc galaxies using Hubble space telescope Advanced Camera for Surveys and Wide Field Camera 3 observations in both F606W and F814W filters from the GHOSTS (Galaxy Halos, Outer disks, Substructure, Thick disks, and Star clusters) survey. The observed fields probe the…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular Gas Reservoirs in High-redshift Galaxies
Carilli, Chris; Bell, Eric F.; Bacon, Roland +29 more
We study the molecular gas properties of high-z galaxies observed in the ALMA Spectroscopic Survey (ASPECS) that targets an ∼1 arcmin2 region in the Hubble Ultra Deep Field (UDF), a blind survey of CO emission (tracing molecular gas) in the 3 and 1 mm bands. Of a total of 1302 galaxies in the field, 56 have spectroscopic redshifts and c…
Constraints on deviations from ΛCDM within Horndeski gravity
Verde, Licia; Jimenez, Raul; Cuesta, Antonio J. +1 more
Recent anomalies found in cosmological datasets such as the low multipoles of the Cosmic Microwave Background or the low redshift amplitude and growth of clustering measured by e.g., abundance of galaxy clusters and redshift space distortions in galaxy surveys, have motivated explorations of models beyond standard ΛCDM. Of particular interest are …
VLT FORS2 Comparative Transmission Spectroscopy: Detection of Na in the Atmosphere of WASP-39b from the Ground
Nikolov, Nikolay; Fortney, Jonathan J.; Gibson, Neale P. +5 more
We present transmission spectroscopy of the warm Saturn-mass exoplanet WASP-39b made with the Very Large Telescope FOcal Reducer and Spectrograph (FORS2) across the wavelength range 411-810 nm. The transit depth is measured with a typical precision of 240 parts per million (ppm) in wavelength bins of 10 nm on a V = 12.1 mag star. We detect the sod…
Inferred H⍺ Flux as a Star Formation Rate Indicator at z ~ 4-5: Implications for Dust Properties, Burstiness, and the z = 4-8 Star Formation Rate Functions
Wilkins, Stephen M.; Franx, Marijn; Labbé, Ivo +3 more
We derive Hα fluxes for a large spectroscopic and photometric-redshift-selected sample of sources over GOODS-North and South in the redshift range z = 3.8-5.0 with deep Hubble Space Telescope (HST), Spitzer/IRAC, and ground-based observations. The Hα flux is inferred based on the offset between the IRAC 3.6 µm flux and that predicted from th…
The galaxy UV luminosity function at z ≃ 2-4; new results on faint-end slope and the evolution of luminosity density
Mortlock, Alice; Dunlop, James S.; McLure, Ross J. +1 more
We present a new, robust measurement of the evolving rest-frame ultraviolet (UV) galaxy luminosity function (LF) over the key redshift range from z ≃ 2 to z ≃ 4. Our results are based on the high dynamic range provided by combining the Hubble Ultra Deep Field (HUDF), CANDELS/GOODS-South, and UltraVISTA/COSMOS surveys. We utilize the unparalleled m…
Planck 2015 results. XVIII. Background geometry and topology of the Universe
Miville-Deschênes, M. -A.; Bernard, J. -P.; Planck Collaboration +223 more
Maps of cosmic microwave background (CMB) temperature and polarization from the 2015 release of Planck data provide the highestquality full-sky view of the surface of last scattering available to date. This enables us to detect possible departures from a globally isotropic cosmology. We present the first searches using CMB polarization for correla…
Green Pea Galaxies Reveal Secrets of Lyα Escape
Jaskot, Anne; Malhotra, Sangeeta; Gronke, Max +5 more
We analyze archival Lyα spectra of 12 “Green Pea” galaxies observed with the Hubble Space Telescope, model their Lyα profiles with radiative transfer models, and explore the dependence of the Lyα escape fraction on various properties. Green Pea galaxies are nearby compact starburst galaxies with [O III] λ5007 equivalent widths (EWs) of hundreds of…