A5070565982- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Circadian rhythm and melatonin
- Cosmology and Gravitation Theories
- Ion-surface interactions and analysis
- Remote Sensing in Agriculture
- Advanced Fluorescence Microscopy Techniques
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
Instituto de Astrofísica de Canarias
2021-2023
Universidad de La Laguna
2021-2023
Lancaster University
2016-2021
Institute of Astrophysics and Space Sciences
2015-2016
University of Lisbon
2015-2016
We present and explore deep narrow- medium-band data obtained with the Subaru Isaac Newton Telescopes in ∼2 deg2 COSMOS field. use these as an extremely wide, low-resolution (R ∼ 20–80) Integral Field Unit survey to slice through field obtain a large sample of ∼4000 Ly α emitters (LAEs) from z 2 6 16 redshift slices (SC4K). new luminosity functions (LFs) covering comoving volume ∼108 Mpc3. SC4K extensively complements ultradeep surveys, jointly over 4 dex revealing global (2.5 < 6) synergy...
The ionizing photon escape fraction (LyC $f_{\rm{esc}}$) of star-forming galaxies is the single greatest unknown in reionization budget. Stochastic sightline effects prohibit direct separation LyC leakers from non-leakers at significant redshift. Here we circumvent this uncertainty by inferring $f_{\rm{esc}}$ with resolved (R>4000) LyA profiles X-SHOOTER survey z=2 (XLS-z2). We select ($f_{\rm{esc}}>20$%) and ($f_{\rm{esc}}<5$%) a representative sample $>0.2 L^{*}$ emitters (LAEs). With...
We present the third and final data release of Large Early Galaxy Astrophysics Census (LEGA-C), an ESO/VLT public spectroscopic survey targeting $0.6 < z 1.0$, Ks-selected galaxies. The contains 3528 spectra with measured stellar velocity dispersions population properties, a 25-fold increase in sample size compared to previous work. This $K_s$-selected probes galaxy down $\sim0.3 L^*$, for all colors morphological types. Along we publish value-added catalog ionized gas dispersions,...
ABSTRACT The cosmic ionizing emissivity from star-forming galaxies has long been anchored to UV luminosity functions. Here, we introduce an framework based on Lyα emitters (LAEs), which naturally hones in the subset of responsible for background due intimate connection between production and escape LyC photons. Using constraints fractions bright LAEs (LLyα &gt; 0.2L*) at z ≈ 2 obtained resolved profiles, arguing their redshift-invariance, show that: (i) quasars together reproduce...
We present results from the largest contiguous narrow-band survey in near-infrared. have used wide-field infrared camera/Canada–France–Hawaii Telescope and lowOH2 filter (1.187 ± 0.005 μm) to ≈10 deg2 of extragalactic sky SA22 field. A total ∼6000 candidate emission-line galaxies are found. use deep ugrizJK data obtain robust photometric redshifts. combine our with High-redshift(Z) Emission Line Survey (HiZELS), explore spectroscopic surveys (VVDS, VIPERS) own follow-up KMOS, FMOS MOSFIRE...
We present the first results from X-SHOOTER Lyman-$\alpha$ survey at $z=2$ (XLS-$z2$). XLS-$z2$ is a deep spectroscopic of 35 emitters (LAEs) utilising $\approx90$ hours exposure time with VLT/X-SHOOTER and covers rest-frame Ly$\alpha$ to H$\alpha$ emission R$\approx4000$. sample selection, observations data reduction. Systemic redshifts are measured optical lines for 33/35 sources. In stacked spectrum, our LAEs characterised by an interstellar medium little dust, low metallicity high...
We investigate the rest-frame UV morphologies of a large sample Lyman-a emitters (LAEs) from z~2 to z~6, selected in uniform way with 16 different narrow- and medium-bands over full COSMOS field. use 3045 LAEs HST coverage stacking analysis find that they have M_UV~-20, below M*_UV at these redshifts. also focus our on subsample 780 individual galaxies i_AB<25 for which GALFIT converges 429 them. The median size (re~1 kpc), ellipticities (slightly elongated (b/a)~0.45), S\'ersic index...
Abstract Drawing from the LEGA-C data set, we present spectroscopic view of stellar population across a large volume- and mass-selected sample galaxies at look-back time. We measure 4000 Å break (D n 4000) Balmer absorption line strengths (probed by H δ ) 1019 high-quality spectra z = 0.6–1.0 with M * 2 × 10 ⊙ to 3 11 . Our analysis serves as first illustration power high-resolution, high signal-to-noise ratio continuum spectroscopy intermediate redshifts qualitatively new tool constrain...
ABSTRACT We explore deep rest-frame UV to FIR data in the COSMOS field measure individual spectral energy distributions (SED) of ∼4000 SC4K (Sobral et al.) Lyman α (Ly α) emitters (LAEs) at z ∼ 2–6. find typical stellar masses 109.3 ± 0.6 M⊙ and star formation rates (SFR) SFR$_{\rm SED}=4.4^{+10.5}_{-2.4}$ yr−1 Ly\,\alpha }=5.9^{+6.3}_{-2.6}$ yr−1, combined with very blue slopes $\beta =-2.1^{+0.5}_{-0.4}$, but significant variations within population. MUV β are correlated a similar way...
Abstract Using high-resolution spectra from the VLT Large Early Galaxy Astrophysics Census (LEGA-C) program, we reconstruct star formation histories (SFHs) of 607 galaxies at redshifts z = 0.6–1.0 and stellar masses ≳10 10 M ⊙ using a custom full spectrum fitting algorithm that incorporates emcee FSPS packages. We show mass-weighted age galaxy correlates strongly with velocity dispersion ( σ * ) ongoing (SF) activity, content in higher- having formed earlier faster. The SFHs quiescent are...
Cluster star-forming galaxies are found to have an excess of Far-Infrared emission relative H-alpha (Ha), when compared those in the field, which could be caused by intense AGN activity, dust and/or declining star formation histories. Here we present spectroscopic observations Ha emitters Cl 0939+4713 (Abell 851) super-cluster at z=0.41, using AF2+WYFFOS on WHT. We measure [OII], Hbeta (Hb), [OIII], and [NII] for a sample 119 around cluster. find that 17+-5% AGN, irrespective environment....
We investigate the clustering and halo properties of $\sim 5000$ Ly$\alpha$-selected emission line galaxies (LAEs) from Slicing COSMOS 4K (SC4K) archival NB497 imaging SA22 split in 15 discrete redshift slices between $z \sim 2.5 - 6$. measure lengths $r_0 3 6\ h^{-1}$ Mpc typical masses 10^{11}$ M$_\odot$ for our narrowband-selected LAEs with $L_{\rm{Ly}\alpha} 10^{42 43}$ erg s$^{-1}$. The intermediate band-selected are observed to have 3.5 15\ 10^{11 12}$ 10^{43 43.6}$ find a strong,...
We use new near-infrared spectroscopic observations to investigate the nature and evolution of most luminous H\alpha (Ha) emitters at z~0.8-2.23, which evolve strongly in number density over this period, compare them more typical Ha emitters. study 59 with $L_{H\alpha}>L_{H\alpha}^*$, roughly equally split per redshift slice z~0.8, 1.47 2.23 from HiZELS CF-HiZELS surveys. find that, overall, 30$\pm$8% are AGN (80$\pm$30% these broad-line AGN, BL-AGN), we little no fraction redshift, within...
We present the first results from largest H$\alpha$ survey of star formation and AGN activity in galaxy clusters. Using 9 different narrow band filters, we select $>3000$ emitters within $19$ clusters their larger scale environment over a total volume $1.3\times10^5$ Mpc$^3$. The sample includes both relaxed merging clusters, covering $0.15-0.31$ redshift range spanning $5\times10^{14}$ $M_{\odot}$ to $30\times10^{14}$ $M_{\odot}$. find that luminosity function (LF) for has higher...
We investigate the stellar kinematics and populations of 58 radio-loud galaxies intermediate luminosities (L$_{3 GHz}$ $>$ 10$^{23}$ W Hz$^{-1}$ ) at 0.6 < z 1. This sample is constructed by cross-matching from deep VLT/VIMOS LEGA-C spectroscopic survey with VLA 3 GHz dataset. The continuum spectra reveal for first time velocity dispersions age indicators $\sim$ 1 radio galaxies. find that $z\sim 1$ AGN occur exclusively in predominantly old high dispersions: $\sigma_*>$ 175 km s$^{-1}$,...
We present stellar rotation curves and velocity dispersion profiles for 104 quiescent galaxies at $z=0.6-1$ from the Large Early Galaxy Astrophysics Census (LEGA-C) spectroscopic survey. Rotation is typically probed across 10-20kpc, or to an average of 2.7${\rm R_e}$. Combined with central dispersions ($σ_0$) this provides first determination dynamical state a sample selected by lack star formation activity large lookback time. The most massive ($M_{\star}>2\times10^{11}\,M_{\odot}$)...
We present the second data release of Large Early Galaxy Astrophysics Census (LEGA-C), an ESO 130-night public spectroscopic survey conducted with VIMOS on Very Telescope. 1988 spectra typical continuum S / N ~= 20 /Angstrom galaxies at 0.6 ~< z 1.0, each observed for ~20 hours and fully reduced a custom-built pipeline. also catalog redshifts, emission line fluxes, Lick/IDS indices, stellar gas velocity dispersions that are spatially integrated quantities including both rotational motions...
Despite recent progress in understanding Lyman-alpha (Lya) emitters (LAEs), relatively little is known regarding their typical black hole activity across cosmic time. Here, we study the X-ray and radio properties of ~4000 LAEs at 2.2<z<6 from SC4K survey COSMOS field. We detect 254 (6.8+-0.4%) individually X-rays (S/N>3) find an average luminosity 10^{44.31+-0.01} erg/s accretion rate (BHAR) 0.72+-0.01 Msun/yr, consistent with moderate to high accreting AGN. 120 sources deep data (radio AGN...
While traditionally associated with active galactic nuclei (AGN), the properties of C ii] (λ = 2326 Å), iii] (λ, λ 1907, 1909 Å) and iv 1549, 1551 emission lines are still uncertain as large, unbiased samples sources scarce. We present first blind, statistical study ii], emitters at z ∼ 0.68, 1.05, 1.53, respectively, uniformly selected down to a flux limit ∼4 × 10−17 erg s−1 cm−1 through narrow-band survey covering an area ∼1.4 deg2 over COSMOS UDS. detect 16 35 17 emitters, whose nature we...
ABSTRACT We measure the evolution of rest-frame UV luminosity function (LF) and stellar mass (SMF) Lyman-α (Ly α) emitters (LAEs) from z ∼ 2 to 6 by exploring ∼4000 LAEs SC4K sample. find a correlation between Ly α (LLy (MUV), with best fit M$_{\rm UV}=-1.6_{-0.3}^{+0.2}\log _{10} (\rm L_{Ly\,\alpha }/erg\, s^{-1})+47_{-11}^{+12}$ shallower relation LLy (M⋆), $\log M_\star /{\rm M}_\odot)=0.9_{-0.1}^{+0.1}\log s^{-1})-28_{-3.8}^{+4.0}$. An increasing cut predominantly lowers number density...
Understanding galaxy formation and evolution requires studying the interplay between growth of galaxies their black holes across cosmic time. Here, we explore a sample Hα-selected star-forming from High Redshift Emission Line Survey use wealth multiwavelength data in Cosmic Evolution field (X-rays, far-infrared radio) to study relative rates typical central supermassive holes, z = 2.23 0. Typical at ∼ 1–2 have hole accretion (| $\dot{M}_{\rm BH}$ |) 0.001–0.01 M⊙ yr−1 star (SFRs) ∼10–40...
Recently, the CIII] and CIV emission lines have been observed in galaxies early Universe ($z>5$), providing new ways to measure their redshift study stellar populations AGN. We explore first blind CII], survey ($z\sim0.68, 1.05, 1.53$, respectively) presented Stroe et al. (2017). derive luminosity functions (LF) properties of line emitters through comparisons LFs H$\alpha$ Ly$\alpha$ emitters, UV selected star forming (SF) quasars at similar redshifts. The CII] LF $z\sim0.68$ is equally well...
We present results from the largest contiguous narrow-band survey in near-infrared. have used WIRCam/CFHT and lowOH2 filter (1.187$\pm$0.005 $μ$m) to ~10 deg$^2$ of extragalactic sky SA22 field. A total ~6000 candidate emission-line galaxies are found. use deep ugrizJK data obtain robust photometric redshifts. combine our with High-redshift Emission Line Survey (HiZELS), explore spectroscopic surveys (VVDS, VIPERS) own follow-up KMOS, FMOS MOSFIRE derive large samples high-redshift selected...
Abstract Aimed at the detection of cosmological gas being accreted onto galaxies in local universe, we examined H α emission halo 164 field view Multi-Unit Spectroscopic Explorer Wide survey (MUSE-Wide) with observable (redshift <0.42). An exhaustive screening corresponding images led us to select 118 reliable emitting clouds. The signals are faint, a surface brightness <?CDATA ${10}^{-17.3\pm 0.3}\,\mathrm{erg}\,{{\rm{s}}}^{-1}\,{\mathrm{cm}}^{-2}\,{\mathrm{arcsec}}^{-2}$?> <mml:math...