Search Publications
The far-ultraviolet continuum slope as a Lyman Continuum escape estimator at high redshift
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +25 more
Most of the hydrogen in the intergalactic medium (IGM) was rapidly ionized at high redshifts. While observations have established that reionization occurred, observational constraints on the high-redshift ionizing emissivity remain elusive. Here, we present a new analysis of the Low-redshift Lyman Continuum Survey (LzLCS) and literature observatio…
The synchrony of production and escape: half the bright Lyα emitters at z ≈ 2 have Lyman continuum escape fractions ≈50 per cent
Hayes, Matthew; Conroy, Charlie; Schaerer, Daniel +14 more
The ionizing photon escape fraction [Lyman continuum (LyC) fesc] of star-forming galaxies is the single greatest unknown in the reionization budget. Stochastic sightline effects prohibit the direct separation of LyC leakers from non-leakers at significant redshifts. Here we circumvent this uncertainty by inferring fesc using …
The ALMA REBELS Survey: dust continuum detections at z > 6.5
Inami, Hanae; Nanayakkara, Themiya; Ferrara, Andrea +25 more
We report 18 dust continuum detections (≥3.3σ) at ~88 and 158 $\mu{\rm m}$ out of 49 ultraviolet (UV)-bright galaxies (MUV < -21.3 mag) at $z$ > 6.5, observed by the Cycle-7 Atacama Large Millimeter/submillimeter Array (ALMA) Large Program, Reionization-Era Bright Emission Line Survey (REBELS) and its pilot programs. This has more…
A stringent upper limit on dark matter self-interaction cross-section from cluster strong lensing
Andrade, Kevin E.; Fuson, Jackson; Gad-Nasr, Sophia +4 more
We analyse strongly lensed images in eight galaxy clusters to measure their dark matter density profiles in the radial region between 10 kpc and 150 kpc, and use this to constrain the self-interaction cross-section of dark matter (DM) particles. We infer the mass profiles of the central DM haloes, bright central galaxies, key member galaxies, and …
Constraining the evolution of cataclysmic variables via the masses and accretion rates of their underlying white dwarfs
Reichart, D. E.; Knigge, C.; Gänsicke, B. T. +28 more
We report on the masses (MWD), effective temperatures ($\rm{T_\mathrm{eff}}$), and secular mean accretion rates ($\langle \dot{M} \rangle$) of 43 cataclysmic variable (CV) white dwarfs, 42 of which were obtained from the combined analysis of their Hubble Space Telescope ultraviolet data with the parallaxes provided by the Early Third Da…
Dual constraints with ALMA: new [O III] 88-µm and dust-continuum observations reveal the ISM conditions of luminous LBGs at z 7
Carniani, Stefano; Maiolino, Roberto; Jones, Gareth C. +10 more
We present new [${\rm O\, {\small III}}$] 88-$\mu \mathrm{{m}}$ observations of five bright z ~ 7 Lyman-break galaxies spectroscopically confirmed by ALMA through [${\rm C\, {\small II}}$] 158 $\mu \mathrm{{m}}$, unlike recent [${\rm O\, {\small III}}$] detections where Lyman α was used. This nearly doubles the sample of Epoch of Reionization gala…
The star formation burstiness and ionizing efficiency of low-mass galaxies
Contini, Thierry; van Dokkum, Pieter; Reddy, Naveen +5 more
We investigate the burstiness of star formation and the ionizing efficiency of a large sample of galaxies at 0.7 < z < 1.5 using HST grism spectroscopy and deep ultraviolet (UV) imaging in the GOODS-N and GOODS-S fields. The star formation history (SFH) in these strong emission-line low-mass galaxies indicates an elevated star formation rate…
Continuum reverberation mapping and a new lag-luminosity relationship for AGN
Netzer, Hagai
High cadence, high quality observations of active galactic nuclei (AGN) clearly show continuum variations with lags, relative to the shortest observed variable UV continuum that increase with wavelength ('lag spectra'). These have been attributed to the irradiation and heating of the central accretion disc by the central X-ray emitting corona. An …
Inferring the intergalactic medium neutral fraction at z 6-8 with low-luminosity Lyman break galaxies
Pentericci, Laura; Treu, Tommaso; Bradač, Maruša +6 more
We present a Bayesian inference on the neutral hydrogen fraction of the intergalactic medium (IGM), $\overline{x}_{\small HI}$, at z ~ 6-8 using the properties of Lyman break galaxies (LBGs) during the epoch of reionization. We use large samples of LBG candidates at 5.5 ≤ z ≤ 8.2 with spectroscopy from Keck/DEIMOS and Keck/MOSFIRE. For each galaxy…
A black hole detected in the young massive LMC cluster NGC 1850
Dreizler, S.; Da Costa, G. S.; Cabrera-Ziri, I. +8 more
We report on the detection of a black hole (NGC 1850 BH1) in the ~100-Myr-old massive cluster NGC 1850 in the Large Magellanic Cloud. It is in a binary system with a main-sequence turn-off star (4.9 ± 0.4 M⊙), which is starting to fill its Roche lobe and is becoming distorted. Using 17 epochs of Very Large Telescope/Multi-Unit Spectrosc…