A5053686857- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Advanced Vision and Imaging
- Remote Sensing in Agriculture
- Geological Formations and Processes Exploration
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Advanced Fluorescence Microscopy Techniques
- Geometry and complex manifolds
- Material Science and Thermodynamics
- Geophysics and Sensor Technology
- Advanced Numerical Analysis Techniques
- Atomic and Subatomic Physics Research
- Historical Astronomy and Related Studies
- Phase Equilibria and Thermodynamics
- Stochastic processes and statistical mechanics
University of La Serena
2014-2024
Museu de Astronomia e Ciências Afins
2007-2012
Laboratoire d’Astrophysique de Marseille
2009-2012
Centre National de la Recherche Scientifique
2009-2012
Universidade de São Paulo
2007-2009
The Southern Photometric Local Universe Survey (S-PLUS) is imaging ~9300 deg^2 of the celestial sphere in twelve optical bands using a dedicated 0.8 m robotic telescope, T80-South, at Cerro Tololo Inter-American Observatory, Chile. telescope equipped with 9.2k by e2v detector 10 um pixels, resulting field-of-view 2 plate scale 0.55"/pixel. survey consists four main subfields, which include two non-contiguous fields high Galactic latitudes (8000 |b| > 30 deg) and areas plane bulge (for an...
Abstract We present the results of prompt optical follow-up electromagnetic counterpart gravitational-wave event GW170817 by Transient Optical Robotic Observatory South Collaboration. detected highly significant dimming in light curves ( mag, mag) over course only 80 minutes observations obtained ∼35 hr after trigger with T80-South telescope. A second epoch observations, ∼59 EABA 1.5 m telescope, confirms fast fading nature transient. The observed colors suggest that this was a “blue...
We studied, for the first time, near-infrared, stellar and baryonic Tully–Fisher relations a sample of field galaxies taken from homogeneous Fabry–Perot [the Gassendi HAlpha survey SPirals (GHASP) survey]. The main advantage GHASP over other samples is that maximum rotational velocities were estimated 2D velocity fields, avoiding assumptions about inclination position angle galaxies. By combining these data with 2MASS photometry, optical colours, H i masses different mass-to-light ratio...
We use the EAGLE hydrodynamical simulation to trace quenching history of galaxies in its 10 most massive clusters. two criteria identify moments when suffer significant changes their star formation activity: {\it i)} instantaneous rate (SFR) strongest drop, $\Gamma_{\rm SFR}^{\rm SD}$, and ii)} a "quenching" criterion based on minimum threshold for specific SFR $\lesssim$ 10$^{-11}\rm yr^{-1}$. find that large fraction ($\gtrsim 60\%$) SD}$ outside cluster's R$_{200}$. This ``pre-processed"...
The metal content of a galaxy's interstellar medium reflects the interplay between different evolutionary processes such as feedback from massive stars and accretion gas intergalactic medium. Despite expected abundance low-luminosity galaxies, low-mass low-metallicity regime remains relatively understudied. Since properties their resemble those early identifying objects in Local Universe is crucial to understand stages galaxy evolution. We used DR3 catalog Southern Photometric Survey...
Compact groups (CGs) of galaxies are an extreme environment for the morphological transformations and cessation star formation in galaxies. However, despite initially being conceived as isolated systems, it is now widely recognised that many them not expected. Our objective to understand dynamics CGs, well how surrounding CGs impacts their physical properties. To achieve this, we selected a sample 316 Stripe 82 region, with total 1011 galaxies, 2281 field control sample. We find at least 41%...
In this paper we present a thorough discussion about the photometric redshift (photo-z) performance of Southern Photometric Local Universe Survey (S-PLUS). This survey combines 7 narrow + 5 broad passband filter system, with typical photometric-depth r$\sim$21 AB. For exercise, utilize Data Release 1 (DR1), corresponding to 336 deg$^{2}$ from Stripe-82 region. We rely on \texttt{BPZ2} code compute our estimates, using new library SED models, which includes additional templates for quiescent...
The nearby Hydra Cluster ($\sim$50 Mpc) is an ideal laboratory to understand, in detail, the influence of environment on morphology and quenching galaxies dense environments. We study cluster inner regions ($1R_{200}$) using data from Southern Photometric Local Universe Survey (S-PLUS), which uses 12 narrow broad band filters visible region spectrum. analyse structural (S\'ersic index, effective radius) physical (colours, stellar masses star formation rates) properties. Based this analysis,...
We study the evolution of satellite galaxies in clusters \textsc{c-eagle} simulations, a suite 30 high-resolution cosmological hydrodynamical zoom-in simulations based on \textsc{eagle} code. find that majority are quenched at $z=0$ ($\gtrsim$ 80$\%$) reached this state dense environment (log$_{10}$M$_{200}$[M$_{\odot}$]$\geq$13.5). At low redshift, regardless final cluster mass, appear to reach their quenching low-mass clusters. Moreover, inside they reside dominant population clusters,...
<i>Context. <i/>Compact groups of galaxies are entities that have high densities and serve as laboratories to study galaxy interactions, intergalactic star formation evolution.<i>Aims. <i/>The main goal this is search for young objects in the intragroup medium seven compact galaxies: HCG 2, 7, 22, 23, 92, 100 NGC 92 well evaluate stage interaction each group.<i>Methods. <i/>We used Fabry-Perot velocity fields rotation curves together with <i>GALEX<i/> NUV FUV images optical <i>R<i/>-band HI...
We present new Gemini/GMOS spectroscopic and archival imaging data of the interacting galaxy NGC 92, which is part a compact group displays an extended tidal tail. have studied physical properties 20 star-forming complexes in this system. found that regions located tail 92 ages younger than 8 Myr, suggests these objects were formed situ. The reveals slightly sub-solar metallicities, suggesting they from pre-enriched material. Using oxygen abundances derived for each system, we has flat...
We present new Gemini spectra of 14 objects found within the HI tails Hickson Compact Groups 92 and 100. Nine them are GALEX Far-UV (FUV) Near-UV (NUV) sources. The confirm that these members compact groups have metallicities close to solar, with an average value 12+log(O/H)~8.5. They FUV luminosities 7 x 10^40 erg/s, very young ages (< 100 Myr) two resemble tidal dwarf galaxies (TDGs) candidates. suggest they were created gas clouds ejected during galaxy-galaxy interactions into...
We present new Fabry-Perot observations for a sample of 42 galaxies located in twelve compact groups galaxies: HCG 1, 14, 25, 44, 53, 57, 61, 69, 93, VV 304, LGG 455 and Arp 314. From the observed galaxies, total 26 objects are spiral which range from Sa to Im morphological types. The remaining 16 E, S0 S0a galaxies. Using these observations, we have derived velocity maps, monochromatic dispersion maps 24 where 18 spiral, three S0a, two one is an galaxy. fields obtained, could derive...
Abstract We study the two-dimensional (2D) line-of-sight velocity ( V los ) field of low-inclination, late-type galaxy VV304a. The resulting 2D kinematic map reveals a global, coherent, and extended perturbation that is likely associated with recent interaction massive companion VV304b. use multiband imaging suite test-particle simulations to quantify plausible strength in-plane flows due nonaxisymmetric perturbations show observed are much too large be driven either by spiral structure or...
ABSTRACT Compact groups (CGs) of galaxies show members with morphological disturbances, mainly products galaxy–galaxy interactions, thus making them ideal systems to study galaxy evolution, in high-density environment. To understand how this environment affects the properties galaxies, we select a sample 340 CGs Stripe 82 region, for total 1083 and 2281 field as control sample. By performing multiwavelength fitting process using Southern Photometric Local Universe Survey data, divide our...
We use multiwavelength data (H i, FUV, NUV, R) to search for evidence of star formation in the intragroup medium Hickson Compact Group 100. find that young star-forming regions are located intergalactic H i clouds compact group which extend over 130 kpc away from main galaxies. A tidal dwarf galaxy (TDG) candidate is densest region tail, 61 brightest member and its age estimated be only 3.3 Myr. Fifteen other ii TDG candidates detected Galaxy Evolution Explorer (GALEX) FUV image within a...
We obtained new Fabry-Perot data cubes and derived velocity fields, monochromatic dispersion maps for 28 galaxies in the Hickson compact groups 37, 40, 47, 49, 54, 56, 68, 79 93. find that one third of non-barred group have position angle misalignments between stellar gaseous components. This asymmetric rotation curves are clear signatures kinematic perturbations, probably due to interactions among galaxies. A comparison B-band Tully-Fisher relation GHASP field-galaxy sample shows that,...
We have searched for young star-forming regions around the merger remnant NGC 2782. By using GALEX FUV and NUV imaging HI data we found seven UV sources, located at distances greater than 26 kpc from center of 2782, coinciding with its western tidal tail. These were resolved in several smaller systems when Gemini/GMOS r-band images used. compared observed colors to stellar population synthesis models that these objects ages ~1 11 Myr masses ranging 10^3.9 10^4.6 Msun. spectroscopic confirm...
We present high-quality VLT-FLAMES optical spectroscopy of the nebular gas in giant star-forming region 30 Doradus. In this paper, first a series, we introduce our observations and discuss main kinematic features Dor, as revealed by ionized region. The primary data set consists regular grid observations, which used to produce spectroscopic datacube centered on massive star cluster R136 covering field-of-view 10'x10'. emission lines are from Halpha [NII]6548,6584. emission-line profile varies...
We used K-band photometry, maximum rotational velocities derived from Fabry-Perot data and HI observed predicted masses to study, for the first time, K-band, stellar baryonic Tully-Fisher relations galaxies in Hickson compact groups. compared these with ones defined less dense environments GHASP survey a sample of gas-rich galaxies. find that most group lie on relation by field few low-mass outliers, namely HCG 49b 96c, which appear have had strong recent burst star formation. The presents...
The aim of this paper is to present the first data set obtained with SOAR Adaptive Module-Fabry–Parot (SAM-FP), a Fabry–Perot instrument mounted inside telescope Adaptive-Optics Module. This only existing imaging interferometer using laser-assisted ground-layer adaptive optics. SAM-FP was used observe ionized gas, traced by Hα, in centre 30 Doradus starburst (the Tarantula Nebula) Large Magellanic Cloud, high spatial (∼0.6 arcsec, or 0.15 pc) and spectral (R ≃ 11 200) resolution. Radial...
We have obtained Gemini/GMOS spectra of 28 regions located across the interacting group NGC 6845, spanning from inner four major galaxies (NGC 6845A, B, C, D) to tidal tails 6845A. All in are star-forming objects with ages younger than 10 Myr. derived gas-phase metallicity gradients 6845A and its two we find that these shallower those for isolated galaxies. has a oxygen central \mbox{12+log(O/H)$\sim$8.5} flat gradient ($\beta$=0.002$\pm$0.004 dex kpc$^{-1}$) out $\sim$4 $\times$ R$_{25}$...
Context . The Southern Photometric Local Universe Survey (S-PLUS) is a project to map ~9300 sq deg of the sky using twelve bands (seven narrow and five broadbands). Observations are performed with T80-South telescope, robotic telescope located at Cerro Tololo Observatory in Chile. survey footprint consists several large contiguous areas, including fields high low galactic latitudes, towards Magellanic Clouds. S-PLUS uses fixed exposure times reach point source depths about 21 mag 𝑔 ri ɀ 20 u...
Interacting galaxies provide us with an excellent laboratory for studying a number of physical phenomena associated these processes. In this paper, we present spectroscopic and kinematic analysis the interacting galaxy NGC 4656 its companion tidal dwarf (TDG) candidate, 4656UV. Using Fabry–Perot GMOS multislit data, investigated possible origin We found that 4656UV has low metallicity (12 + log(O/H)∼8.2) it follows mass–metallicity relation normal galaxies. For 4656, estimated flat oxygen...