A5101814355- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Forensic and Genetic Research
- Mediterranean and Iberian flora and fauna
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Plant Diversity and Evolution
- Plant and Fungal Species Descriptions
- Forensic Anthropology and Bioarchaeology Studies
- Plant tissue culture and regeneration
- Molecular Biology Techniques and Applications
- Plant Pathogens and Fungal Diseases
- Gamma-ray bursts and supernovae
- Plant Parasitism and Resistance
- Fish Ecology and Management Studies
- Genetic diversity and population structure
- Fish biology, ecology, and behavior
- Plant and animal studies
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Education Pedagogy and Practices
- Fish Biology and Ecology Studies
- Seed Germination and Physiology
- Astrophysics and Cosmic Phenomena
University of Lisbon
2019-2024
University of Coimbra
2023
Universidade dos Açores
2001-2023
Centro de Estudos em Geografia e Ordenamento do Territorio
2020
Lisbon School of Design
2019
University of Arizona
2010-2018
Centro Hospitalar de Lisboa Central
2013
Columbia University
2008-2010
National Legal Medicine Institute
2003-2008
University of Hawaii System
2005
We present a study of the spatial distribution and kinematics star-forming galaxies in 30 massive clusters at 0.15<z<0.30, combining wide-field Spitzer 24um GALEX NUV imaging with highly-complete spectroscopy cluster members. The fraction (f_SF) rises steadily cluster-centric radius, increasing fivefold by 2r200, but remains well below field values even 3r200. This suppression star formation large radii cannot be reproduced models which is quenched infalling only once they pass within r200...
The Herschel Lensing Survey (HLS) will conduct deep PACS and SPIRE imaging of ~40 massive clusters galaxies. strong gravitational lensing power these enable us to penetrate through the confusion noise, which sets ultimate limit on our ability probe Universe with Herschel. Here, we present an overview survey a summary major results from Science Demonstration Phase (SDP) observations Bullet Cluster (z=0.297). SDP data are rich, allowing study not only background high-redshift galaxies (e.g.,...
We present an analysis of the levels and evolution star formation activity in a representative sample 30 massive galaxy clusters at 0.15 < z 0.30 from Local Cluster Substructure Survey, combining wide-field Spitzer/MIPS 24 μm data with extensive spectroscopy cluster members. The specific SFRs () star-forming galaxies within r200 are found to be systematically ∼28% lower than their counterparts field fixed stellar mass redshift, difference significant 8.7σ level. This is unambiguous signature...
We present far-infrared (FIR) analysis of 68 brightest cluster galaxies (BCGs) at 0.08 < z 1.0. Deriving total infrared luminosities directly from Spitzer and Herschel photometry spanning the peak dust component (24–500 μm), we calculate obscured star formation rate (SFR). 22+6.2−5.3% BCGs are detected in far-infrared, with SFR = 1–150 M☉ yr−1. The luminosity is highly correlated X-ray gas cooling times for cool-core clusters (gas time <1 Gyr), strongly suggesting that these influenced by...
We present a study of the distribution X-ray active galactic nuclei (AGNs) in representative sample 26 massive clusters at 0.15 < z 0.30, combining Chandra observations sensitive to point sources luminosity LX ∼ 1042 erg s−1 cluster redshift with extensive and highly complete spectroscopy members down ∼M*K + 2. In total we identify 48 AGNs among members, luminosities 2 × 1041–1 1044 s−1. Based on these identifications, estimate that 0.73% ± 0.14% galaxies brighter than MK = −23.1 (M*K 1.5)...
By narrowband imaging in Hα and the adjacent red stellar continuum we have studied rate distribution of star formation 43 systems luminous ultraluminous IR galaxies currently undergoing interaction merging. These are amongst most at 60 μm range distance from ∼50 up to 100 Mpc. Here present red-continuum images, compare rates derived with those estimated luminosity. We find clear evidence for substantial extinction obscuration star-forming regions optical. Without correction reddening host...
Observational evidence for the radial alignment of satellites with their dark matter host has been accumulating steadily over past few years. The effect is seen a wide range scales, from massive clusters galaxies down to galaxy-sized systems, yet underlying physical mechanism still not established. To this end, we have carried out detailed analysis shapes and orientations substructures in high-resolution N-body cosmological simulations. We find strong tendency substructure its halo:...
We study the relation of active galactic nuclei (AGNs) to star formation in their host galaxies. Our sample includes 205 Type-1 and 85 Type-2 AGNs, 162 detected with Herschel, from fields surrounding 30 galaxy clusters Local Cluster Substructure Survey (LoCuSS). The is identified by optical line widths ratios after selection be brighter than 1 mJy at 24 microns. show that AGN [OIII]5007 fluxes high z can contaminated galaxies typical spectrograph entrance apertures (but our not compromised...
Galaxy clusters are expected to form hierarchically in a Λ cold dark matter (ΛCDM) universe, growing primarily through mergers with lower mass and the continual accretion of group-mass haloes. assemble late, doubling their masses since z ∼ 0.5, so outer regions should be replete accreting systems. We present an XMM–Newton survey search for X-ray groups infall 23 massive galaxy (〈M200〉 1015 M⊙) at 0.2, identifying 39 that have been spectroscopically confirmed lie cluster redshift. These...
We present an early broad-brush analysis of <i>Herschel<i/>/PACS observations star-forming galaxies in 8 galaxy clusters drawn from our survey 30 at <i>z<i/> 0.2. define a complete sample 192 spectroscopically confirmed cluster members down to <i>L<i/><sub>TIR<sub/> > 3 × 10<sup>10<sup/> and <i>L<i/><sub><i>K<i/><sub/> 0.25 . The average <i>K<i/>-band bolometric infrared luminosities these both fade by factor ~2 clustercentric radii <i>r<i/><sub>200<sub/> ~0.5 <i>r<i/><sub>200<sub/>,...
We present a sample of 290 24 μm-selected active galactic nuclei (AGNs) mostly at z ∼ 0.3–2.5, within 5.2 distributed as fields around each 30 galaxy clusters in the Local Cluster Substructure Survey. The is nearly complete to 1 mJy μm, and has rich multiwavelength set ancillary data; 162 are detected by Herschel. use spectral templates for AGNs, stellar populations, infrared (IR) emission star-forming galaxies decompose energy distributions (SEDs) these AGNs their host galaxies, estimate...
We report the discovery of a statistically significant radial alignment cluster galaxies in sample 85 X-ray-selected clusters observed Sloan Digital Sky Survey. The tendency for is robust feature our and does not vary significantly with individual or galaxy properties. use dynamical arguments to show that fraction should be undergoing parametric tidal resonance can cause their long axes orient themselves toward center potential, therefore tentatively ascribe this effect.
The Sunyaev-Zel'dovich (SZ) effect is a spectral distortion of the cosmic microwave background as observed through hot plasma in galaxy clusters. This decrement CMB intensity for <i>λ<i/> > 1.3 mm, an increment at shorter wavelengths, and small again by ~ 250 <i>μ<i/>m. As part <i>Herschel<i/> Lensing Survey (HLS) we have mapped 1E0657–56 (the Bullet cluster) with SPIRE bands centered 250, 350 500 <i>μ<i/>m detected SZ two longest wavelengths. measured central intensities are...
The <i>Herschel<i/> Lensing Survey (HLS) takes advantage of gravitational lensing by massive galaxy clusters to sample a population high-redshift galaxies which are too faint be detected above the confusion limit current far-infrared/submillimeter telescopes. Measurements from 100–500 <i>μ<i/>m bracket peaks far-infrared spectral energy distributions these galaxies, characterizing their infrared luminosities and star formation rates. We introduce initial results our science demonstration...
We present a catalog of 129 X-ray galaxy groups, covering redshift range 0.04<z<1.23, selected in the ~3 square degree part CFHTLS W1 field overlapping XMM observations performed under XMM-LSS project. carry out statistical study evolution to one magnitude gap between first and second brightest cluster galaxies well defined mass-selected group sample. find that slope relation fraction groups steepens with redshift, indicating larger fossil at lower redshifts. 22.2$\pm$6% our z$\leq$0.6 are...
We present preliminary results about the detection of high redshift (U)LIRGs in Bullet cluster field by PACS and SPIRE instruments within Herschel Lensing Survey (HLS) Program. describe detail a photometric procedure designed to recover robust fluxes deblend faint sources near confusion noise. The method is based on use positions Spitzer/MIPS 24 um as priors. Our catalogs are able reliably (5 sigma) galaxies with above 6 10 mJy 100 160 channels, respectively, 12 18 bands. also obtain...
We present <i>Herschel<i/>/PACS, MMT/Hectospec and XMM-Newton observations of Abell 1835, one the brightest X-ray clusters on sky, host a strong cool core. Even though 1835 has prototypically "relaxed" morphology no signs ongoing merger activity in strong- weak-lensing mass maps, it complex velocity distribution, suggesting that is still accreting significant amounts form smaller satellite systems. Indeed, we find dynamical segregation star-forming dusty galaxies from optically selected...
The Serra da Estrela Natural Park (NPSEs) in Portugal stands out as a well-preserved region abundant medicinal plants, particularly known for their pharmaceutical applications diabetes prevention and treatment. This comprehensive review explores these plants&#039; botanical diversity, traditional uses, pharmacological applications, chemical composition. NPSEs boast rich diversity with 138 plants across 55 families identified traditionally pharmacologically used against globally. Notably,...
We use deep, five band (100–500 <i>μ<i/>m) data from the <i>Herschel<i/> Lensing Survey (HLS) to fully constrain obscured star formation rate, <i>SFR<i/><sub>FIR<sub/>, of galaxies in Bullet cluster (<i>z<i/> = 0.296), and a smaller background system 0.35) same field. detects 23 members with total <i>SFR<i/><sub>FIR<sub/> 144<i>±<i/>14 yr<sup>-1<sup/>. On average, contains brighter far-infrared (FIR) galaxies, ~50% higher (21 galaxies; 207<i>±<i/> 9 yr<sup>-1<sup/>). SFRs extrapolated 24...
Using far-infrared imaging from the "Herschel Lensing Survey", we derive dust properties of spectroscopically-confirmed cluster member galaxies within two massive systems at z~0.3: merging Bullet Cluster and more relaxed MS2137.3-2353. Most star-forming sources (~90%) have characteristic temperatures similar to local field comparable infrared (IR) luminosity (T_dust ~ 30K). Several sub-LIRG (L_IR < 10^11 L_sun) members are much warmer > 37K) with spectral energy distribution (SED) shapes...
Observational studies of galaxy isophotal shapes have shown that orientations are anisotropic: a galaxy's long axis tends to be oriented toward the center its host. This radial alignment is seen across wide range scales, from galaxies in massive clusters small Milky Way type satellite systems. Recently, this effect has also been detected dark matter simulations cosmological structure, but degree substructures these significantly stronger than observations. In paper we attempt reconcile two...
We present the first scaling relation between weak-lensing galaxy cluster mass, MWL, and near-infrared luminosity, LK. Our results are based on 17 clusters observed with wide-field instruments Subaru, United Kingdom Infrared Telescope, Mayall MMT. concentrate projected 2D mass spectroscopically confirmed luminosity within 1 Mpc, modelled as |$M_{\rm WL} \propto L_{K}^b$|, obtaining a power-law slope of |$b=0.83^{+0.27}_{-0.24}$| an intrinsic scatter |$\sigma _{lnM_{\rm...
We present wide-field <i>Herschel<i/>/PACS observations of A 1689, a massive galaxy cluster at <i>z<i/> = 0.1832, from our open time key programme. detect 39 spectroscopically confirmed 100 <i>μ<i/>m-selected members down to 1.5×10<sup>10<sup/> . These galaxies are forming stars rates in the range 1–10 /yr, and appear comprise two distinct populations: two-thirds unremarkable blue, late-type spirals found throughout cluster; remainder dusty red sequence whose star formation is heavily...
The Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) presents a unique data set for weak-lensing studies, having high-quality imaging and deep multiband photometry. We have initiated an XMM-CFHTLS project to provide X-ray observations of the brightest X-ray-selected clusters within wide CFHTLS area. Performance these high quality allow us revisit identification sources, introducing automated reproducible algorithms, based on multicolor red sequence finder. also introduced new optical...