G. Calistro Rivera
A5022591278- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Phase Equilibria and Thermodynamics
- Superconducting and THz Device Technology
- Pharmacological Effects and Assays
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Impact of Light on Environment and Health
- Space Science and Extraterrestrial Life
- Nuclear Physics and Applications
- Advanced Combustion Engine Technologies
- Gas Dynamics and Kinetic Theory
- History and Developments in Astronomy
- Combustion and flame dynamics
European Southern Observatory
2020-2025
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2024-2025
Leiden University
2016-2020
Leiden Observatory
2016-2019
Max Planck Institute for Astronomy
2013-2016
The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120-168 MHz imaging survey that will eventually cover the entire Northern sky. Each of 3170 pointings be observed for 8 hrs, which, at most declinations, sufficient to produce ~5arcsec resolution images with sensitivity ~0.1mJy/beam and accomplish main scientific aims which are explore formation evolution massive black holes, galaxies, clusters galaxies large-scale structure. Due compact core long baselines LOFAR, provide excellent both highly...
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120-168MHz survey of the entire northern sky for which observations are now 20% complete. We present our first full-quality public data release. For this release 424 square degrees, or 2% eventual coverage, in region HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45$^\circ$00$'$00$''$ 57$^\circ$00$'$00$''$) were mapped using a fully automated direction-dependent calibration imaging...
In this data release from the LOFAR Two-metre Sky Survey (LoTSS) we present 120-168MHz images covering 27% of northern sky. Our coverage is split into two regions centred at approximately 12h45m +44$^\circ$30' and 1h00m +28$^\circ$00' spanning 4178 1457 square degrees respectively. The were derived 3,451hrs (7.6PB) High Band Antenna which corrected for direction-independent instrumental properties as well direction-dependent ionospheric distortions during extensive, but fully automated,...
The Low Frequency Array (LOFAR) is an ideal instrument to conduct deep extragalactic surveys. It has a large field of view and sensitive large-scale compact emission. is, however, very challenging synthesize thermal noise limited maps at full resolution, mainly because the complexity low-frequency sky direction dependent effects (phased array beams ionosphere). In this first paper series, we present new calibration imaging pipeline that aims producing high fidelity, dynamic range images with...
Abstract The study of galaxy evolution hinges on our ability to interpret multiwavelength observations in terms their physical properties. To do this, we rely spectral energy distribution (SED) models, which allow us infer parameters from spectrophotometric data. In recent years, thanks wide and deep multiwave band surveys, the volume high-quality data have significantly increased. Alongside increased data, algorithms performing SED fitting improved, including better modeling prescriptions,...
ABSTRACT Source classifications, stellar masses, and star-formation rates are presented for ≈80 000 radio sources from the first data release of Low Frequency Array Two-metre Sky Survey (LoTSS) Deep Fields, which represents widest deep survey ever undertaken. Using multi-wavelength spanning ultraviolet to far-infrared, spectral energy distribution (SED) fitting is carried out all LoTSS host galaxies using four different SED codes, two include modelling contributions an active galactic...
Abstract We present JWST NIRCam imaging targeting 13 z ~ 3 infrared-luminous ( L IR ∼ 5 × 10 12 ⊙ ) galaxies from the ALESS survey with uniquely deep, high-resolution (0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover> <mml:mrow> <mml:mo>.</mml:mo> </mml:mrow> <mml:mtext>″</mml:mtext> </mml:mover> </mml:math> 08–0 <mml:mo accent="false">″</mml:mo> 16) Atacama Large Millimeter/submillimeter Array 870 μ m imaging. The 2.0–4.4 (observed frame) reveals...
Radio emission is a key indicator of star formation activity in galaxies, but the radio luminosity–star relation has to date been studied almost exclusively at frequencies 1.4 GHz or above. At lower frequencies, effects thermal are greatly reduced, and so we would expect observed be completely dominated by synchrotron radiation from supernova-generated cosmic rays. As part LOFAR Surveys Key Science project, Herschel-ATLAS NGP field surveyed with an effective frequency 150 MHz. We select...
We present sub-kpc-scale mapping of the 870 $\mu$m ALMA continuum emission in six luminous ($L_{\rm IR}~\sim~5~\times10^{12}$ L$_{\odot}$) submillimeter galaxies (SMGs) from ALESS survey Extended Chandra Deep Field South. Our high-fidelity 0.07$''$-resolution imaging ($\sim$500 pc) reveals robust evidence for structures with deconvolved sizes $\lesssim$0.5-1 kpc embedded within (dominant) exponential dust disks. The large-scale morphologies some show clear curvature and/or clump-like...
We present a study of the low-frequency radio properties star forming (SF) galaxies and active galactic nuclei (AGN) up to redshift $z=2.5$. The new spectral window probed by Low Frequency Array (LOFAR) allows us reconstruct continuum emission from 150 MHz 1.4 GHz an unprecedented depth for radio-selected sample $1542$ in $\sim 7~ \rm{deg}^2$ LOFAR Bo\"otes field. Using extensive multi-wavelength dataset available detailed modelling FIR UV energy distribution (SED), we are able separate...
We use ALMA observations of four sub-millimetre galaxies (SMGs) at $z\sim2-3$ to investigate the spatially resolved properties inter-stellar medium (ISM) scales 1--5 kpc (0.1--0.6$''$). The velocity fields our sources, traced by $^{12}$CO($J$=3-2) emission, are consistent with disk rotation first order, implying average dynamical masses $\sim$3$\times10^{11}$M$_{\odot}$ within two half-light radii. Through a Bayesian approach we uncertainties inherent dynamically constraining total gas...
We present AGNfitter, a publicly available open-source algorithm implementing fully Bayesian Markov Chain Monte Carlo method to fit the spectral energy distributions (SEDs) of active galactic nuclei (AGN) from sub-mm UV, allowing one robustly disentangle physical processes responsible for their emission. AGNfitter makes use large library theoretical, empirical, and semi-empirical models characterize both nuclear host galaxy emission simultaneously. The model consists four components: an...
ABSTRACT We present predictions for the extent of dust-continuum emission main-sequence galaxies drawn from TNG50 simulation in range z = 1–5. couple radiative transfer code SKIRT to output and measure half-light radius modelled galaxies, assuming a Milky Way dust type metallicity-dependent dust-to-metal ratio. The at observed-frame 850 $\mu$m is up ∼75 per cent larger than stellar half-mass radius, but significantly more compact 1.6 (roughly corresponding H band) particularly towards high...
We present a study of luminous, z=0.15, type-2 quasar (log [L([OIII])/(erg/s)]=42.8) from the Quasar Feedback Survey. It is classified as 'radio-quiet' [L(1.4 GHz)/(W/Hz)]=23.8); however, radio imaging reveals ~1 kpc low-power jets [Pjet/(erg/s)]=44) inclined into plane galaxy disk. combine MUSE and ALMA observations to map stellar kinematics ionised molecular gas properties. The are seen drive galaxy-wide bi-conical turbulent outflows, reaching W80 = 1000-1300 km/s, in phase (traced via...
Abstract We present detailed studies of a z = 2.12 submillimeter galaxy, ALESS67.1, using sub-arcsecond resolution ALMA, adaptive optics-aided VLT/SINFONI, and Hubble Space Telescope ( HST )/CANDELS data to investigate the kinematics spatial distributions dust emission (870 μ m continuum), 12 CO( J 3–2), strong optical lines, visible stars. Dynamical modeling lines suggests that ALESS67.1 is not pure rotating disk but merger, consistent with apparent tidal features revealed in imaging. Our...
The Lockman Hole is a well-studied extragalactic field with extensive multi-band ancillary data covering wide range in frequency, essential for characterising the physical and evolutionary properties of various source populations detected deep radio fields (mainly star-forming galaxies AGNs). In this paper we present new 150-MHz observations carried out LOw Frequency ARray (LOFAR), allowing us to explore spectral window faint population. This image covers an area 34.7 square degrees...
We present 0.15-arcsec (1 kpc) resolution ALMA observations of the [CII] 157.74 um line and rest-frame 160-um continuum emission in two z~3 dusty, star-forming galaxies - ALESS 49.1 57.1, combined with resolved CO(3-2) observations. In both sources, surface brightness distribution is dominated by a compact core $\leq$1 kpc radius, factor 2-3 smaller than extent emission. 49.1, we find an additional extended (8-kpc radius), low surface-brightness component. Based on analysis mock...
ABSTRACT We use a sample of powerful $z\, \approx \, 0.1$ type 2 quasars (‘obscured’; log [LAGN/erg s$^{-1}]\, \gtrsim 45$), which host kpc-scale ionized outflows and jets, to identify possible signatures AGN feedback on the total molecular gas reservoirs their galaxies. Specifically, we present Atacama Pathfinder EXperiment (APEX) observations CO(2–1) transition for nine sources CO(6–5) subset three. find that majority our reside in starburst galaxies (average specific star formation rates...
Fundamental differences in the radio properties of red quasars (QSOs), as compared to blue QSOs, have been recently discovered, positioning them a potential key population evolution galaxies and black holes across cosmic time. To elucidate their nature, we exploited rich compilation photometry spectroscopic data model spectral energy distributions (SEDs) from UV FIR characterise emission-line properties. Following systematic comparison approach, infer AGN accretion, obscuration, host galaxy...
ABSTRACT We present the first results from Quasar Feedback Survey, a sample of 42 z &lt; 0.2, [O iii] luminous AGNs ( L[O III] &gt; 1042.1 ergs s−1) with moderate radio luminosities (i.e. L1.4GHz 1023.4 W Hz−1; median = 5.9 × 1023 Hz−1). Using high spatial resolution (∼0.3–1 arcsec), 1.5–6 GHz images Very Large Array, we find that 67 per cent have spatially extended features on ∼1–60 kpc scales. The sizes and morphologies suggest these may be lower luminosity versions compact,...
We examine the distribution of radio emission from ~42,000 quasars Sloan Digital Sky Survey, as measured in LOFAR Two-Metre Survey (LoTSS). present a model luminosity that assumes every quasar displays superposition two sources emission: active galactic nuclei (jets) and star-formation. Our two-component provides an excellent match to observed flux density distributions across wide range redshifts optical luminosities; this suggests jet-launching mechanism operates all but with different...