A5079133544- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Advanced Vision and Imaging
- Remote Sensing in Agriculture
- Cosmology and Gravitation Theories
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Plant Water Relations and Carbon Dynamics
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Satellite Image Processing and Photogrammetry
- Space Exploration and Technology
- Material Science and Thermodynamics
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
Universidad Andrés Bello
2024-2025
University of Concepción
2014-2023
Federico Santa María Technical University
2018
Trinity House
2014
Johns Hopkins University
2004-2010
University of California, Riverside
2008-2010
European Southern Observatory
2003-2009
Envia Systems (United States)
2009
Trieste Astronomical Observatory
2009
European Southern Observatory
2009
We measure the morphology--density relation (MDR) and morphology-radius (MRR) for galaxies in seven z ~ 1 clusters that have been observed with Advanced Camera Surveys on board Hubble Space Telescope. Simulations independent comparisons of ourvisually derived morphologies indicate ACS allows one to distinguish between E, S0, spiral down zmag = 24, corresponding L/L* 0.21 0.30 at 0.83 1.24, respectively. adopt density radius estimation methods match those used lower redshift order study...
We evaluate the effects of environment and stellar mass on galaxy properties at 0.85 < z 1.20 using a 3.6um-selected spectroscopic sample 797 cluster field galaxies drawn from GCLASS survey. confirm that for with LogM* > 9.3 well-known correlations between such as star-forming fraction (f_SF), SFR, SSFR, D(4000), color are already in place ~ 1. separate by comparing quiescent fixed environment, mass. The SSFR is correlated mass; however, it independent environment. same trend exists D(4000)...
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 investigate the color-magnitude (CM) relation of galaxies in distant X-ray-selected cluster RDCS 1252.9-2927 at z = 1.24 using images obtained with Advanced Camera for Surveys on Hubble Space Telescope F775W and F850LP bandpasses. select based morphological classifications extending about 3.5 mag down galaxy luminosity function, augmented by spectroscopic membership information. At core is an extensive early-type population surrounding a central pair that show signs dynamical interaction....
We present F435W (B), F606W (broad V), and F814W I) coronagraphic images of the debris disk around β Pictoris obtained with Hubble Space Telescope's Advanced Camera for Surveys. These provide most photometrically accurate morphologically detailed views between 30 300 AU from star ever recorded in scattered light. confirm that previously reported warp inner is a distinct secondary inclined by ∼5° main disk. The projected spine coincides isophotal inflections, or "butterfly asymmetry," seen at...
Using new and published data, we construct a sample of 160 brightest cluster galaxies (BCGs) spanning the redshift interval 0.03 < z 1.63. We use this sample, which covers 70% history universe, to measure growth in stellar mass BCGs after correcting for correlation between BCG it lives. find that increase by factor 1.8 z=0.9 z=0.2. Compared earlier works, our result is closer predictions semi-analytic models. However, at z=0.9, relative z=0.2, are still 1.5 more massive than these Star...
The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a deep z'-band imaging survey covering SWIRE Legacy fields designed to create first large homogeneously-selected sample massive clusters at z > 1 using an infrared adaptation cluster red-sequence method. We present overview northern component which has been observed with CFHT/MegaCam and covers 28.3 deg^2. southern was CTIO/MOSAICII, 13.6 deg^2, summarized in companion paper by Wilson et al. (2008). also spectroscopic...
The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a z'-passband imaging survey, consisting deep (z' ~ 24 AB) observations made from both hemispheres using CFHT 3.6m and CTIO 4m telescopes. survey was designed with primary aim detecting galaxy clusters at z >~ 1. In tandem pre-existing 3.6um Space Telescope SWIRE Legacy Survey, SpARCS detects an infrared adaptation two-filter red-sequence cluster technique. total effective area 41.9 deg^2. this paper, we provide overview...
We use an unprecedented data-set of about 600 redshifts for cluster members, obtained as part a VLT/VIMOS large programme, to constrain the mass profile z=0.44 MACS J1206.2-0847 over radial range 0-5 Mpc (0-2.5 virial radii) using MAMPOSSt and Caustic methods. then add external constraints from our previous gravitational lensing analysis. invert Jeans equation obtain velocity-anisotropy profiles members. With mass-density we first determination pseudo-phase-space density profile. The...
We present the stellar mass functions (SMFs) of star-forming and quiescent galaxies from observations 10 rich clusters in Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS) redshift range 0.86<z<1.34. compare our results with field measurements at similar redshifts using data a Ks-band selected catalogue COSMOS/UltraVISTA field. construct multi-colour for 11 photometric bands covering u-8um, estimate masses SED fitting techniques. To correct interlopers cluster sample, we use deep...
We present a new two-color algorithm, the "Stellar Bump Sequence" (SBS), that is optimized for robustly identifying candidate high-redshift galaxy clusters in combined wide-field optical and mid-infrared (MIR) data. The SBS algorithm fusion of well-tested cluster red-sequence method Gladders & Yee (2000) with MIR 3.6um - 4.5um detection developed by Papovich (2008). As method, identifies overdensities within color slices, which are equivalent rest-frame 1.6um stellar bump "red-sequence"....
We carry out a detailed strong lensing analysis of sub-sample eight galaxy clusters the CLASH survey, in redshift range $ z_{\rm cluster} = [0.23-0.59]$, using extensive spectroscopic information, primarily MUSE archival data complemented with CLASH-VLT measurements. Different models are tested each cluster depending on complexity its mass distribution and number detected multiple images. Four show more than five spectroscopically confirmed image families. In this sample, we do not make use...
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....
Tidal features in the outskirts of galaxies yield unique information about their past interactions and are a key prediction hierarchical structure formation paradigm. The Vera C. Rubin Observatory is poised to deliver deep observations for potentially millions objects with visible tidal features, but inference galaxy interaction histories from such not straightforward. Utilising automated techniques human visual classification conjunction realistic mock images produced using NEWHORIZON...
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...
We present a comprehensive mass reconstruction of the rich galaxy cluster Cl 0024+17 at z~0.4 from ACS data, unifying both strong- and weak-lensing constraints. The signal dense distribution background galaxies (~120 per square arcmin) across enables derivation high-resolution parameter-free map. strongly-lensed objects tightly constrain structure inner region on an absolute scale, breaking mass-sheet degeneracy. obtained in such way is remarkable. It reveals ringlike dark matter...
We present Hubble Space Telescope Advanced Camera for Surveys multicolor coronagraphic images of the recently discovered edge-on debris disk around nearby ($10 pc) M dwarf AU Microscopii.The is seen between r ¼ 0B75 and 15 00 (7.5-150 ) from star.It has a thin midplane with projected FWHM thickness 2.5-3.5 within < 50 star that increases to 6.5-9 at $ 75 AU.The disk's radial brightness profile generally flat AU, then decreases gradually (I / À1:8 out % 43 beyond which it falls rapidly À4:7...
We study the photometric and structural properties of spectroscopically confirmed members in two massive X-ray-selected z ≈ 0.83 galaxy clusters MS 1054-03 RX J0152.7-1357 using three-band mosaic imaging with Hubble Space Telescope Advanced Camera for Surveys. The samples include 105 140 1054-03, respectively, to i775 < 24.0. A quantitative classification scheme Sérsic indices "bumpiness" (the ratio rms residuals model mean) was found correlate well visual morphological type. color-magnitude...
[Abridged] XMMU J2235.3-2557 is one of the most distant X-ray selected clusters, spectroscopically confirmed at z=1.39. We characterize galaxy populations passive members, thermodynamical properties hot gas, its metal abundance and total mass system using imaging data with HST/ACS (i775 z850 bands) VLT/ISAAC (J K_s bands), extensive spectroscopic obtained VLT/FORS2, deep Chandra observations. Out a sample 34 cluster we 16 galaxies within central 2' (or 1 Mpc) ACS coverage, inferred star...
We present a weak-lensing analysis of the z=1.4 galaxy cluster XMMU J2235.3-2557, based on deep Advanced Camera for Surveys images. Despite observational challenge set by high redshift lens, we detect substantial lensing signal at >~ 8 sigma level. This clear detection is enabled in part mass cluster, which verified our both parametric and non-parametric estimation mass. Assuming that follows Navarro-Frenk-White profile, estimate projected within r=1 Mpc (8.5+-1.7) x 10^14 solar mass, where...
We present deep HSTACS observations in g 475 r 625 i 775 z 850 toward the ¼ 4:1 radio galaxy TN J1338À1942 and its overdensity of >30 spectroscopically confirmed Ly emitters (LAEs).We select 66 band dropouts to 850;5 27, 6 which are also LAEs.Although our color-color selection results a relatively broad redshift range centered on 4:1, field is richer than average at >5 significance, based comparison with GOODS.The angular distribution filamentary about half objects clustered near galaxy,...
We derive stellar masses, ages and star formation histories of massive early-type galaxies in the z=1.237 RDCS1252.9-2927 cluster compare them with those measured a similarly mass-selected sample field contemporaries drawn from GOODS South Field. Robust estimates these parameters are obtained by comparing large grid composite population models 8-9 band photometry rest-frame NUV, optical IR, thus sampling entire relevant domain emission different populations. Additionally, we present new,...
Recent independent results from numerical simulations and observations have shown that brightest cluster galaxies (BCGs) increased their stellar mass by a factor of almost two between z~0.9 z~0.2. The further suggest more than half this is accreted through major mergers. Using sample 18 distant galaxy clusters with over 600 spectroscopically confirmed members them, we search for observational evidence mergers do play significant role. We find merger rate 0.38 +/- 0.14 per Gyr at z~1. While...
We present a multi-wavelength study of galaxy populations in the core massive, X-ray luminous cluster XMMU J2235 at z = 1.39, based on high quality VLT and HST photometry optical near-infrared wavelengths.