A5006269247- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Relativity and Gravitational Theory
- Medical Imaging Techniques and Applications
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
- Scientific Research and Discoveries
- Advanced X-ray and CT Imaging
- Particle physics theoretical and experimental studies
- Optical Systems and Laser Technology
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
Pontificia Universidad Católica de Chile
2016-2024
University of Concepción
2011-2017
Max Planck Institute for Radio Astronomy
2016
Max Planck Society
2016
University of Hawaii System
2009-2012
Yale University
2002-2010
Rütgers (Germany)
2010
Rutgers, The State University of New Jersey
2010
Rutgers Sexual and Reproductive Health and Rights
2010
European Southern Observatory
2006-2009
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
We use SDSS+\textit{GALEX}+Galaxy Zoo data to study the quenching of star formation in low-redshift galaxies. show that green valley between blue cloud star-forming galaxies and red sequence quiescent colour-mass diagram is not a single transitional state through which most evolve into Rather, an analysis takes morphology account makes clear only small population early-type move rapidly across after morphologies are transformed from disk spheroid quenched rapidly. In contrast, majority have...
The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg$^2$ of the COSMOS field with an effective exposure $\simeq$160 ks over central 1.5 and $\simeq$80 in remaining area. combination 56 new observations, obtained as X-ray Visionary Project, previous C-COSMOS survey. We describe reduction analysis observations properties 2273 point sources detected above spurious probability 2$\times 10^{-5}$. also present updated data. whole includes 4016 (3814, 2920 2440 full, soft...
We describe the results of an extremely deep, 0.28 deg2 survey for z = 3.1 Lyα emission-line galaxies in Extended Chandra Deep Field-South. By using a narrowband 5000 Å filter and complementary broadband photometry from MUSYC survey, we identify statistically complete sample 162 with monochromatic fluxes brighter than 1.5 × 10-17 ergs cm-2 s-1 observer's frame equivalent widths greater 80 Å. show that width distribution these objects follows exponential rest-frame scale length w0 76 In...
Using multiwavelength surveys of active galactic nuclei across a wide range bolometric luminosities (10^{43}
We constrain the number density and evolution of Compton-thick Active Galactic Nuclei (AGN). In local Universe we use wide area surveys from Swift INTEGRAL satellites, while for high redshifts explore candidate selections based on a combination X-ray mid-IR parameters. find significantly lower space AGN in than expected published population synthesis models to explain background. This can be explained by numerous degeneracies parameters those models; high-energy described here remove...
We report the final optical identifications of medium-depth (∼60 ks), contiguous (2 deg2) XMM-Newton survey COSMOS field. has detected ∼1800 X-ray sources down to limiting fluxes ∼5 × 10−16, ∼3 10−15, and ∼7 10−15 erg cm−2 s−1 in 0.5–2 keV, 2–10 5–10 keV bands, respectively (∼1 ∼6 ∼1 10−14 s−1, three respectively, over 50% area). The work is complemented by an extensive collection multiwavelength data from 24 μm UV, available survey, for each sources, including spectroscopic redshifts ≳50%...
We study the incidence of nuclear obscuration on a complete sample 1310 active galactic nuclei (AGN) selected basis their rest-frame 2–10 keV X-ray flux from XMM-COSMOS survey, in redshift range 0.3 < z 3.5. classify AGN as obscured or unobscured either optical spectral properties and overall SED shape spectrum. The two classifications agree about 70 per cent objects, remaining 30 can be further subdivided into distinct classes: at low luminosities do not always show signs broad lines...
We study the fraction of dual AGN in a sample 167 nearby (z<0.05), moderate luminosity, ultra hard X-ray selected from all-sky Swift BAT survey. Combining new Chandra and Gemini observations together with optical observations, we find that frequency at scales <100 kpc is 10% (16/167). Of 16 AGN, 3 (19%) were detected using spectroscopy not emission line diagnostics. Close (<30 kpc) tend to be more common among most luminous systems. In luminosity both increases strongly decreasing...
Mergers of galaxies are thought to cause significant gas inflows the inner parsecs, which can activate rapid accretion on supermassive black holes (SMBHs), giving rise active galactic nuclei (AGN). During a fraction this process, SMBHs predicted be enshrouded by and dust. Studying 52 in infrared-selected local luminous ultraluminous infrared different merger stages hard X-ray band, where radiation is less affected absorption, we find that amount material around increases during last phases...
ABSTRACT We present the catalog of optical and infrared counterparts Chandra COSMOS-Legacy Survey, a 4.6 Ms program on 2.2 deg 2 COSMOS field, combination 56 new overlapping observations obtained in Cycle 14 with previous C-COSMOS survey. In this Paper we report i , K 3.6 μ m identifications 2273 X-ray point sources detected observations. use likelihood ratio technique to derive association optical/infrared (IR) for 97% sources. also update information 1743 C-COSMOS, using not available when...
Abstract We present the first results from Mapping Obscuration to Reionization with ALMA (MORA) survey, largest Atacama Large Millimeter/submillimeter Array (ALMA) blank-field contiguous survey date (184 arcmin 2 ) and only at mm search for dusty star-forming galaxies (DSFGs). use 13 sources detected above 5 σ estimate galaxy number counts this wavelength. These are then combined state-of-the-art 1.2 3 a backward evolution model place constraints on of IR luminosity function dust-obscured...
We studied the clustering properties and multiwavelength spectral energy distributions of a complete sample 162 Ly Alpha-Emitting (LAE) galaxies at z=3.1 discovered in deep narrow-band MUSYC imaging Extended Chandra Deep Field South. LAEs were selected to have observed frame equivalent widths >80A emission line fluxes >1.5E-17 erg/cm^2/s. Only 1% our LAE appears host AGN. The exhibit moderate spatial correlation length r_0=3.6+0.8-1.0 Mpc, corresponding bias factor b=1.7+0.3-0.4, which...
We investigate the X-ray number counts in 1–2 Ms Chandra Deep Fields (CDFs) to determine contributions of faint source populations extragalactic background (XRB). sources were separated into active galactic nuclei (AGNs), star-forming galaxies, and Galactic stars primarily on basis their X-ray–to–optical flux ratios, optical spectral classifications, spectra, intrinsic luminosities. Number count slopes normalizations below 2 × 10-15 ergs cm-2 s-1 calculated each band for all types assuming a...
We present UBVRIz' optical images taken with MOSAIC on the CTIO 4 m telescope of 0.32 deg2 Extended Hubble Deep Field-South. This is one four fields comprising MUSYC survey, which optimized for study galaxies at z = 3, active galactic nucleus (AGN) demographics, and Galactic structure. Our methods used astrometric calibration, weighted image combination, photometric calibration in AB magnitudes are described. calculate corrected aperture photometry its uncertainties find through tests that...
We present deep optical 18-medium-band photometry from the Subaru telescope over ~30' x 30' Extended Chandra Deep Field-South (ECDF-S), as part of Multiwavelength Survey by Yale-Chile (MUSYC). This field has a wealth ground- and space-based ancillary data, contains GOODS-South Hubble Ultra Field. combine imaging with existing UBVRIzJHK Spitzer IRAC images to create uniform catalog. Detecting sources in MUSYC BVR image we find ~40,000 galaxies R_AB<25.3, median 5 sigma limit 18 medium bands....
We selected 40 candidate Lyman Alpha Emitting galaxies (LAEs) at z ~=3.1 with observed frame equivalent widths >150A and inferred emission line fluxes >2.5x10^-17 ergs/cm^2/s from deep narrow-band broad-band MUSYC images of the Extended Chandra Deep Field South. Covering 992 sq. arcmin, this is largest ``blank field'' surveyed for LAEs ~3, allowing an improved estimate space density population 3+-1x10^-4 h_70^3/Mpc^3. Spectroscopic follow-up 23 candidates yielded 18 redshifts, all ~=3.1....
We use data from the Sloan Digital Sky Survey and visual classifications of morphology Galaxy Zoo project to study black hole growth in nearby Universe (z < 0.05) break down AGN host galaxy population by color, stellar mass morphology.We find that at luminosities L[O iii] > 10 40 ergs -1 early-and late-type galaxies is fundamentally different.AGN as a have broad range masses (10 -10 11 M ⊙ ), reside green valley color-mass diagram their central holes median around 6.5 .However, comparing...
We present an investigation into how well the properties of accretion flow on to a supermassive black hole may be coupled those overlying hot corona. To do so, we specifically measure characteristic spectral index, Γ, power-law energy distribution, over range 2–10 keV, for X-ray selected, broad-lined radio-quiet active galactic nuclei (AGN) up z ∼ 2 in Cosmic Evolution Survey (COSMOS) and Extended Chandra Deep Field South (E-CDF-S). test previously reported dependence between Γ mass, full...
Hard X-ray ($\geq 10$ keV) observations of Active Galactic Nuclei (AGN) can shed light on some the most obscured episodes accretion onto supermassive black holes. The 70-month Swift/BAT all-sky survey, which probes 14-195 keV energy range, has currently detected 838 AGN. We report here broad-band (0.3-150 characteristics these AGN, obtained by combining XMM-Newton, Swift/XRT, ASCA, Chandra, and Suzaku in soft band ($\leq with averaged data. non-blazar AGN our sample are almost equally...
We present the rest-frame optical morphologies of active galactic nucleus (AGN) host galaxies at 1.5<z<3, using near-infrared imaging from Hubble Space Telescope Wide Field Camera 3, first such study AGN these redshifts. The are X-ray selected Chandra Deep South and have typical luminosities 1E42 < L_X 1E44 erg/s. Accreting black holes in this luminosity redshift range account for a substantial fraction total space density hole mass growth over cosmic time; they thus represent an important...
We report on observations of NGC1068 with NuSTAR, which provide the best constraints to date its $>10$~keV spectral shape. find no strong variability over past two decades, consistent Compton-thick AGN classification. The combined Chandra, XMM-Newton, and Swift-BAT dataset offers new insights into complex reflected emission. critical combination high signal-to-noise NuSTAR data a spatial decomposition Chandra allow us break several model degeneracies greatly aid physical interpretation. When...
We present the results of a program to acquire high-quality optical spectra X-ray sources detected in E-CDF-S and its central area. New spectroscopic redshifts are measured for 283 counterparts Chandra with deep exposures (t~2-9 hr per pointing) using multi-slit facilities on both VLT Keck thus bringing total number spectroscopically-identified over 500 this survey field. provide comprehensive catalog including near-infrared counterparts, (both photometric) that incorporate published...
We present a new, K-selected, optical-to-near infrared photometric catalog of the Extended Chandra Deep Field South (ECDFS), making it publicly available to astronomical community.22 The data set is founded on imaging, supplemented by original z'JK imaging collected as part MUltiwavelength Survey Yale–Chile (MUSYC). final consists photometry derived from UU38BVRIz'JK covering full ECDFS, plus H-band for approximately 80% field. 5σ flux limit point sources . This also nominal completeness and...