Hugo Messias
A5052083645- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Superconducting and THz Device Technology
- Particle Accelerators and Free-Electron Lasers
- Mechanics and Biomechanics Studies
- Particle accelerators and beam dynamics
- Vascular Tumors and Angiosarcomas
- Spectroscopy Techniques in Biomedical and Chemical Research
- University-Industry-Government Innovation Models
- Educational Tools and Methods
- Ionosphere and magnetosphere dynamics
Atacama Large Millimeter Submillimeter Array
2017-2024
European Southern Observatory
2017-2024
Institute of Astrophysics and Space Sciences
2011-2022
University of Concepción
2012-2020
University of Lisbon
2010-2019
Spanish National Observatory
2018
Centro Hospitalar de Lisboa Ocidental
2016
RTX (United States)
1975
EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The primary goal of to make deep (rms ~ 10 microJy/beam) entire Southern Sky at 1.3 GHz, extending as far North +30 degrees declination, with resolution arcsec. expected detect and catalogue about 70 million galaxies, including typical star-forming galaxies up z~1, powerful starbursts even greater redshifts, AGNs edge visible Universe. It will undoubtedly discover...
In this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of Cosmic Evolution Survey (COSMOS) field. The availability a large training set spectroscopic that extends faint magnitudes enabled comparable highest quality results presently available normal galaxies. We demonstrate morphologically extended, X-ray without optical variability are more accurately described by library galaxies (corrected emission lines) than active...
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...
The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. Event Horizon Telescope observations of in 2017, at wavelength 1.3 mm, revealed ring-like structure, which was interpreted as gravitationally lensed emission around central hole3. Here we report images obtained 2018, 3.5 showing that the compact core spatially resolved. High-resolution imaging shows structure [Formula: see text] Schwarzschild radii diameter, approximately 50% larger than...
We present the Spitzer Extragalactic Representative Volume Survey (SERVS), an 18 deg2 medium-deep survey at 3.6 and 4.5 μm with postcryogenic Space Telescope to ≈2 μJy (AB = 23.1) depth of five highly observed astronomical fields (ELAIS-N1, ELAIS-S1, Lockman Hole, Chandra Deep Field South, XMM-LSS). SERVS is designed enable study galaxy evolution as a function environment from z ∼ 5 day first extragalactic that both large enough deep put rare objects such luminous quasars clusters ≳ 1 into...
We investigate how star-forming galaxies typically assemble their masses at high redshift. Using the deep multi-wavelength coverage of GOODS dataset, we measure stellar mass a large sample z~4 and 5, make robust determination function (SMF). report broad correlation between UV luminosity, such that more UV-luminous are, on average, massive. However, has substantial intrinsic scatter evidenced by non-negligible number UV-faint but massive galaxies. Furthermore, low-mass end SMF does not rise...
Exploiting the sensitivity and spatial resolution of Atacama Large Millimeter/submillimeter Array (ALMA), we have studied morphology physical scale interstellar medium - both gas dust in SGP38326, an unlensed pair interacting starbursts at $z= 4.425$. SGP38326 is most luminous star bursting system known $z > 4$ with IR-derived ${\rm SFR \sim 4300 \,} M_\odot \, {\rm yr}^{-1}$. also contains a molecular reservoir among massive ever found early Universe, it likely progenitor massive,...
Abstract Dusty star-forming galaxies at high redshift (1 < z 3) represent the most intense regions in universe. Key aspects to these processes are gas heating and cooling mechanisms, although it is well known that gas-rich, little about excitation conditions. Only a few detailed radiative transfer studies have been carried out owing lack of multiple line detections per galaxy. Here we examine sample 24 strongly lensed identified by Planck satellite (LPs) ∼ 1.1–3.5. We analyze 162 CO...
We report on the polarized light curves of Galactic Center supermassive black hole Sagittarius A * , obtained at millimeter wavelength with Atacama Large Millimeter/submillimeter Array (ALMA). The observations took place as a part Event Horizon Telescope campaign. compare taken during low variability source state 2017 Apr. 6 and 7 those immediately after X-ray flare 11. For latter case, we observe rotation electric vector position angle timescale ∼70 min. interpret this signature equatorial...
Dusty star-forming galaxies are among the most prodigious systems at high redshift (z>1), characterized by star formation rates and huge dust reservoirs. The bright end of this population has been well in recent years, but considerable uncertainties remain for fainter dusty galaxies, which responsible bulk thus play a key role galaxy growth evolution. In first paper our series, we describe methods finding faint using millimeter observations with ALMA. We obtained ALMA 1.1 mm mosaic images...
The Atacama Millimeter/submillimeter Array (ALMA) Phasing Project (APP) has developed and deployed the hardware software necessary to coherently sum signals of individual ALMA antennas record aggregate in Very Long Baseline Interferometry (VLBI) Data Exchange Format. These beamforming capabilities allow array collectively function as equivalent a single large aperture participate global VLBI arrays. inclusion phased current networks operating at (sub)millimeter wavelengths provides an order...
We analyse the molecular and atomic emission lines of 71 bright Herschel-selected galaxies between redshifts 1.4 to 4.6 detected by Atacama Large Millimetre/submillimetre Array. These include a total 156 CO, [C I], H2O lines. For 46 galaxies, we detect two transitions CO lines, for these find gas properties similar those other dusty star-forming galaxy (DSFG) samples. A comparison photo-dissociation models suggests that most have interstellar medium conditions as local infrared-luminous...
We present a detailed description of the special procedures for calibration and quality assurance Atacama Large Millimeter/submillimeter Array (ALMA) observations in Very Long Baseline Interferometry (VLBI) mode. These are required to turn phased ALMA array into fully calibrated VLBI station. As an illustration these methodologies, we full-polarization carried out with as at 3mm (Band 3) 1.3mm 6) part Cycle-4. first science conducted were obtained during 2017 campaign concert other...
Abstract Blazars are a class of jet-dominated active galactic nuclei with typical double-humped spectral energy distribution. It is common consensus that the synchrotron emission responsible for low frequency peak, while origin high hump still debated. The analysis X-rays and their polarization can provide valuable tool to understand physical mechanisms high-energy blazars. We report first observations BL Lacertae (BL Lac) performed Imaging X-ray Polarimetry Explorer, from which an upper...
Using the IRAM NOrthern Extended Millimetre Array (NOEMA), we conducted a Large Programme ( z -GAL) to measure redshifts for 126 bright galaxies detected in Herschel Astrophysical Area Survey (H-ATLAS), HerMES Mode (HeLMS), and Stripe 82 (HerS) Survey. We report reliable spectroscopic total of 124 -selected galaxies. The are estimated from scans 3 2-mm bands (and, one source, 1-mm band), covering up 31 GHz each band, based on detection at least two emission lines. Together with Pilot...
Using a sample of BzK-selected galaxies at z~2 identified from the CFHT/WIRCAM near-infrared survey GOODS-North, we discuss relation between star formation rate (SFR), specific (SSFR), and stellar mass (M_{*}), clustering as function these parameters. For star-forming (sBzKs), UV-based SFR, corrected for extinction, scales with SFR ~ M_{*}^{alpha} alpha = 0.74+/-0.20 down to M_{*} 10^{9} M_{solar}, indicating weak dependence on SSFR. We also measure angular correlation hence infer length...
[Abridged] It is widely accepted that observations at mid-infrared (mid-IR) wavelengths enable the selection of galaxies with nuclear activity, which may not be revealed even in deepest X-ray surveys. In this work new near- and mid-IR color diagnostics are explored, aiming for improved efficiency - better completeness less contamination selecting AGN out to very high redshifts. We restrict our study James Webb Space Telescope wavelength range (0.6-27um). The criteria created based on...
Using the IRAM NOrthern Extended Millimeter Array (NOEMA), we conducted a program to measure redshifts for 13 bright galaxies detected in Herschel Astrophysical Large Area Survey (H-ATLAS) with $S_{500{\mu}\rm m}\ge$80 mJy. We report reliable spectroscopic 12 individual sources, which are derived from scans of 3 and 2 mm bands, covering up 31 GHz each band, based on detection at least two emission lines. The range $2.08<z<4.05$ median value $z=2.9\pm$0.6. sources unresolved or barely...
We present an exploration of the expected detection earliest Active Galactic Nuclei (AGN) in Universe from state-of-art galaxy formation and evolution semi-analytic models hydro-dynamical simulations. estimate number radiative characteristics Super Massive Black Holes (SMBHs) at $z\geq 6$, a redshift range that will be intensively explored by next generation telescopes, particular radio through Square Kilometre Array (SKA) high energies with ESA's Athena X-ray Observatory. find able to...
In this paper we study the properties of six optically dark galaxies detected in 69 arcmin^2 GOODS-ALMA 1.1mm continuum survey. While none them are listed deepest H-band based CANDELS catalog GOODS-South field down to H=28.16AB, were able de-blend two from their bright neighbor and measure an $H$-band flux for them. We note that AGS4 AGS15 have H=25.23, 27.11AB respectively. Their extreme proximity (0.50", 0.27") a optical source faintness prevented being included catalog. present...
We present spectroscopic measurements for 71 galaxies associated with 62 of the brightest high-redshift submillimeter sources from Southern fields Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS), while targeting 85 which resolved into 142. have obtained robust redshift all using 12-m Array and an efficient tuning ALMA to optimise its use as a hunter, 73 per cent having identification. Nine these identifications also rely on observations Atacama Compact Array. The redshifts span...
We present 101 and 151 GHz ALMA continuum images for 85 fields selected from Herschel observations that have 500 micron flux densities >80 mJy 250-500 colours consistent with z > 2, most of which are expected to be gravitationally lensed or hyperluminous infrared galaxies. Approximately half the sources were resolved into multiple sources, but 11 15 brightest correspond individual sources. For 37 containing either a single source spectroscopic redshift two same redshift, we examined colour...