A5037058109- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Space Exploration and Technology
- Geological and Tectonic Studies in Latin America
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Spectroscopy and Chemometric Analyses
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Particle accelerators and beam dynamics
- Spectroscopy and Laser Applications
- Geophysics and Sensor Technology
- Historical and Architectural Studies
- Advanced Image Processing Techniques
University of Concepción
2014-2023
Las Campanas Observatory
2023
Centre National de la Recherche Scientifique
2011-2018
Astrophysique, Instrumentation et Modélisation
2011-2018
Université Paris Cité
2011-2018
CEA Paris-Saclay
2011-2018
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2011-2018
University of Valparaíso
2016-2018
Délégation Paris 7
2011-2018
Université Paris-Saclay
2018
We present the deepest 100 to 500 μm far-infrared observations obtained with Herschel Space Observatory as part of GOODS-Herschel key program, and examine infrared (IR) 3–500 spectral energy distributions (SEDs) galaxies at 0 < z 2.5, supplemented by a local reference sample from IRAS, ISO, Spitzer, AKARI data. determine projected star formation densities their radio mid-IR continuum sizes.
We use deep panchromatic datasets in the GOODS-N field, from GALEX to deepest Herschel far-infrared and VLA radio continuum imaging, explore, using mass-complete samples, evolution of star formation activity dust attenuation star-forming galaxies z~4. Our main results can be summarized as follows: i) slope SFR-M correlation is consistent with being constant, equal ~0.8 at least up z~1.5, while its normalization keeps increasing redshift; ii) for first time here we are able explore FIR-radio...
We present a 69 arcmin$^2$ ALMA survey at 1.1mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of GOODS-South field. taper 0"24 original image with homogeneous and circular synthesized beam 0"60 to reduce number independent beams - thus reducing purely statistical spurious detections optimize sensitivity point sources. extract catalogue galaxies selected by identify sources without HST counterparts down 5$\sigma$ limiting depth H=28.2 AB (HST/WFC3 F160W). detects 20 brighter than 0.7...
We take advantage of the sensitivity and resolution Herschel Space Observatory at 100 160 μm to directly image thermal dust emission investigate infrared luminosities (LIR) obscuration typical star-forming (L*) galaxies high redshift. Our sample consists 146 UV-selected with spectroscopic redshifts 1.5 ⩽ zspec < 2.6 in GOODS-North field. Supplemented deep Very Large Array Spitzer imaging, we construct median stacks positions these 24, 100, μm, 1.4 GHz. The comparison between stacked fluxes a...
We present a study of the infrared properties X-ray selected, moderate-luminosity (i.e. LX= 1042–1044 erg s−1) active galactic nuclei (AGNs) up to z ≈ 3, in order explore links between star formation galaxies and accretion on their central black holes. use 100 160 μ m fluxes from GOODS-Herschel – deepest survey yet undertaken by Herschel telescope show that vast majority cases >94 per cent) these are dominated emission host galaxy. As such, far-infrared bands provide an uncontaminated view...
Many theoretical models require powerful active galactic nuclei (AGNs) to suppress star formation in distant galaxies and reproduce the observed properties of today's massive galaxies. A recent study based on Herschel-SPIRE submillimeter observations claimed provide direct support for this picture, reporting a significant decrease mean rates (SFRs) most luminous AGNs (LX >1044 erg s−1) at z ≈ 1–3 Chandra Deep Field-North (CDF-N). In Letter, we extend these results using 250 μm data COSMOS...
We use high-resolution continuum images obtained at 870microns with the Atacama Large Millimeter Array (ALMA) to probe surface density of star-formation in z~2 galaxies and study different physical properties between within above main sequence galaxies. This sample eight star-forming selected among most massive Herschel GOODS-South field is supplemented eleven from public data 1.3 mm survey Hubble Ultra-Deep Field. ALMA reveals systematically dense concentrations dusty close center stellar...
We explore the effects of active galactic nuclei (AGNs) and star formation activity on infrared (0.3–1000 μm) spectral energy distributions (SEDs) luminous galaxies from z = 0.5 to 4.0. have compiled a large sample 151 selected at 24 μm (S24 ≳ 100 μJy) in GOODS-N ECDFS fields for which we deep Spitzer IRS spectroscopy, allowing us decompose mid-IR spectrum into contributions AGN activity. A significant portion (∼25%) our is dominated by an (>50% luminosity) mid-IR. Based classification,...
We explore the gas-to-dust mass ratio (G/D) and CO luminosity-to-Mgas conversion factor (a_co) of two well studied galaxies in GOODS-N field, that are expected to have different star forming modes, starburst GN20 at z=4.05 normal star-forming galaxy BzK-21000 z=1.52. Detailed sampling is available for their Rayleigh-Jeans emission via ground based mm interferometry (1.1-6.6mm) along with Herschel, PACS SPIRE data probe peak infrared emission. Using physically motivated Draine & Li (2007)...
Using deep 100-160 micron observations in GOODS-S from the GOODS-H survey, combined with HST/WFC3 NIR imaging CANDELS, we present first morphological analysis of a complete, FIR selected sample 52 ULIRGs at z~2. We also make use comparison galaxies without Herschel detections but same z and magnitude distribution. Our visual classifications these two samples indicate that fraction objects disk spheroid morphologies is roughly there are significantly more mergers, interactions, irregular...
Submillimeter/millimeter observations of dusty star-forming galaxies with the Atacama Large Millimeter/submillimeter Array (ALMA) have shown that dust continuum emission generally occurs in compact regions smaller than stellar distribution. However, it remains to be understood how systematic these findings are. Studies often lack homogeneity sample selection, target discontinuous areas inhomogeneous sensitivities, and suffer from modest u v coverage coming single array configurations....
Our current understanding of the cosmic star formation history at z>3 is primarily based on UV-selected galaxies (i.e., LBGs). Recent studies H-dropouts have revealed that we may be missing a large proportion taking place in massive z>3. In this work, extend H-dropout criterion to lower masses select optically dark/faint (OFGs), order complete census between LBGs and H-dropouts. (H> 26.5 mag & [4.5] < 25 mag) combined with de-blending technique designed not only extremely dust-obscured but...
Models of galaxy evolution assume some connection between the AGN and star formation activity in galaxies. We use multi-wavelength information CDFS to assess this issue. select AGNs from 3Ms XMM-Newton survey measure star-formation rates their hosts using data that probe rest-frame wavelengths longward 20 um. Star-formation are obtained spectral energy distribution fits, identifying subtracting an component. divide by stellar masses derive specific (sSFR) find evidence for a positive...
Dust attenuation curves in external galaxies are useful to study their dust properties as well interpret intrinsic spectral energy distributions. In particular the presence or absence of a UV bump at 2175 A remains an open issue which has consequences on interpretation broad band colours distant galaxies. We curve range z >1. we search for bump. use deep photometric data CDFS obtained with intermediate and filters by MUSYC project sample rest-frame 1<z <2. Herschel/PACS Spitzer/MIPS used...
We introduce the ALMA Redshift 4 Survey (AR4S), a systematic survey of all known galaxies with stellar mass (M*) larger than 5e10 Msun at 3.5<z<5 in GOODS--south, UDS and COSMOS CANDELS fields. The sample we have analyzed this paper is composed 96 observed 890um (180um rest-frame) an on-source integration time 1.3 min per galaxy. detected 32% more 3 sigma significance. Using stacked Herschel photometry, derived average dust temperature 40+/-2 K for whole sample, extrapolate Lir SFR our based...
Compact star formation appears to be generally common in dusty star-forming galaxies (SFGs). However, its role the framework set by scaling relations galaxy evolution remains understood. In this work we follow up on sample from GOODS-ALMA 2.0 survey, an ALMA blind survey at 1.1 mm covering a continuous area of 72.42 arcmin 2 using two array configurations. We derived physical properties, such as rates, gas fractions, depletion timescales, and dust temperatures for built survey. There exists...
Star formation in massive galaxies is quenched at some point during hierarchical mass assembly. To understand where and when the quenching processes takes place, we study evolution of total star rate per unit halo (\Sigma(SFR/M)) three different scales: low halos (field galaxies), groups, clusters, up to a redshift ~1.6. We use deep far-infrared PACS data 100 160 um accurately estimate Luminous Infrared Galaxy population 9 clusters with ~10^{15} M_{\odot}, groups/poor ~ 5 x 10^{13}...
We present optical and infrared photometry of the unusual Type Ia supernova 2000cx. With data Li et al. Jha, this constitutes largest set ever assembled for a SN, more than 600 points in UBVRIJHK. confirm finding regarding unusually blue B−V colors as SN 2000cx entered nebular phase. Its I‐band secondary hump was extremely weak given its B‐band decline rate. The V minus near‐infrared likewise do not match loci based on other slowly declining SNe, although V−K is least "abnormal." In several...
Using extremely deep PACS 100- and 160um Herschel data from the GOODS-Herschel program, we identify 21 infrared bright galaxies previously missed in deepest 24um surveys performed by MIPS. These MIPS dropouts are predominantly found two redshift bins, centred at z ~0.4 ~1.3. Their S_100/S_24 flux density ratios similar to those of local LIRGs ULIRGs, whose silicate absorption features 18um (at ~ 0.4) 9.7um 1.3) shifted into band these redshifts. The high-z sub-sample consists 11 luminous...
We present CMDs in the V and I bands for fifteen star clusters Small Magellanic Cloud (SMC) based on data taken with Very Large Telescope (VLT, Chile). selected these from our previous work, wherein we derived cluster radial velocities metallicities Calcium II infrared triplet (CaT) spectra also VLT. discovered that ages of six have been appreciably underestimated by studies, which used comparatively small telescopes, graphically illustrating need large apertures to obtain reliable old...
We have compiled a large sample of 151 high-redshift (z = 0.5–4) galaxies selected at 24 μm (S24 > 100 μJy) in the GOODS-N and ECDFS fields for which we deep Spitzer IRS spectroscopy, allowing us to decompose mid-infrared spectrum into contributions from star formation activity galactic nuclei. In addition, wealth photometric data IRAC/MIPS Herschel PACS/SPIRE. explore how effective different infrared color combinations are separating our mid-IR spectroscopically determined active nuclei...
We aim to characterize the relationship between dust properties. also provide equations estimate accurate properties from limited observational datasets. assemble a sample of 1,630 nearby (z<0.1) galaxies-over large range Mstar, SFR - with multi-wavelength observations available wise, iras, planck and/or SCUBA. The characterization emission comes SED fitting using Draine & Li models, which we parametrize two components (warm and cold ). subsample these galaxies global measurements CO HI are...