Pablo G. Pérez‐González
A5049563283- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
- Remote Sensing in Agriculture
- Superconducting and THz Device Technology
- Advanced Vision and Imaging
- Pulsars and Gravitational Waves Research
- Plant Water Relations and Carbon Dynamics
- Astro and Planetary Science
- Nuclear Physics and Applications
- History and Developments in Astronomy
Centro de Astrobiología
2018-2025
Dublin Institute For Advanced Studies
2024
Universidad Complutense de Madrid
2013-2023
Klinik und Poliklinik für Neurologie
2023
Universitätsklinikum Tübingen
2023
Munich Cluster for Systems Neurology
2023
Neurologisches Fachkrankenhaus für Bewegungsstörungen/Parkinson
2023
ARC Centre of Excellence for All-sky Astrophysics
2023
ASTRO-3D
2023
Space Telescope Science Institute
2023
The Multiband Imaging Photometer for Spitzer (MIPS) provides long-wavelength capability the mission in imaging bands at 24, 70, and 160 μm measurements of spectral energy distributions between 52 100 a resolution about 7%. By using true detector arrays each band, it both critical sampling point-spread function relatively large fields view, allowing substantial advances sensitivity, angular resolution, efficiency areal coverage compared with previous space far-infrared capabilities. 24 array...
We analyze a sample of ~2600 MIPS/Spitzer 24mic sources brighter than ~80muJy and located in the Chandra Deep Field South to characterize evolution comoving infrared (IR) energy density Universe up z~1. Using published ancillary optical data we first obtain nearly complete redshift determination for objects associated with R<24 counterparts at z<1. find that population 0.5 10^11 L_IR) are responsible 70+/-15% this Taking into account contribution UV luminosity evolving as (1+z)^~2.5,...
The extragalactic background light (EBL) is of fundamental importance both for understanding the entire process galaxy evolution and γ-ray astronomy, but overall spectrum EBL between 0.1 1000 μm has never been determined directly from spectral energy distribution (SED) observations over a wide redshift range. evolving, derived here utilizing novel method based on only. This achieved observed rest-frame K-band luminosity function up to 4, combined with determination galaxy-SED-type fractions....
We are performing a uniform and unbiased, ~7x7 degrees imaging survey of the Large Magellanic Cloud (LMC), using IRAC MIPS instruments on board Spitzer Space Telescope in order to agents galaxy's evolution (SAGE), interstellar medium (ISM) stars LMC. The detection diffuse ISM with column densities >1.2x10^21 H cm^-2 permits detailed studies dust processes ISM. SAGE's point source sensitivity enables complete census newly formed masses >3 solar that will determine current star formation rate...
We present a first analysis of deep 24 micron observations with the Spitzer Space Telescope sample nearly 1500 galaxies in thin redshift slice, 0.652x10^10 solar masses) are undergoing period intense star formation above their past-averaged SFR. In contrast, less than 1% equally-massive local universe have similarly activity. Morphologically-undisturbed dominate total infrared luminosity density and SFR density: at z~0.7, more half intensely star-forming spiral morphologies, whereas \~30%...
Aims.We quantify the contributions of 24 μm galaxies to Far-Infrared (FIR) Background at 70 and 160 μm. We provide new estimates Cosmic Infrared (CIB), compare it with Optical (COB).
We use a 24 μm-selected sample containing more than 8000 sources to study the evolution of star-forming galaxies in redshift range from z = 0 ~ 3. obtain photometric redshifts for most our survey using method based on empirically built templates spanning ultraviolet mid-infrared wavelengths. The accuracy these is better 10% 80% sample. derived distribution detected by peaks at around 0.6-1.0 (the location peak being affected cosmic variance) and decays monotonically 1 have fitted infrared...
Using a sample of ~28,000 sources selected at 3.6-4.5 μm with Spitzer observations the Hubble Deep Field North, Chandra South, and Lockman Hole (surveyed area ~664 arcmin2), we study evolution stellar mass content universe 0 < z 4. We calculate masses photometric redshifts, based on ~2000 templates built population dust emission models fitting ultraviolet to mid-infrared spectral energy distributions galaxies spectroscopic redshifts. estimate functions for different redshift intervals. find...
We combine high-resolution HST/WFC3 images with multi-wavelength photometry to track the evolution of structure and activity massive (log(M*) > 10) galaxies at redshifts z = 1.4 - 3 in two fields Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). detect compact, star-forming (cSFGs) whose number densities, masses, sizes, star formation rates qualify them as likely progenitors quiescent, (cQGs) 1.5 3. At 2 most cSFGs have specific star-formation (sSFR 10^-9 yr^-1) half...
Abstract We present an investigation into the first 500 Myr of galaxy evolution from Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one 13 JWST ERS programs, targets formation z ∼ 0.5 to >10 using several imaging and spectroscopic modes. make use epoch CEERS NIRCam imaging, spanning 35.5 arcmin 2 , search for candidate galaxies at > 9. Following a detailed data reduction process implementing custom steps produce high-quality reduced images, we perform multiband...
We present new measurements of the evolution X-ray luminosity functions (XLFs) unabsorbed and absorbed active galactic nuclei (AGNs) out to z ∼ 5. construct samples containing 2957 sources detected at hard (2–7 keV) energies 4351 soft (0.5–2 from a compilation Chandra surveys supplemented by wide-area ASCA ROSAT. consider separately find that XLF based on either (initially neglecting absorption effects) is best described flexible model parametrization where break luminosity, normalization,...
We report the discovery of a candidate galaxy with photo-z z~12 in first epoch JWST Cosmic Evolution Early Release Science (CEERS) Survey. Following conservative selection criteria we identify source robust z_phot = 11.8^+0.3_-0.2 (1-sigma uncertainty) m_F200W=27.3, and >7-sigma detections five filters. The is not detected at lambda < 1.4um deep imaging from both HST JWST, has faint ~3-sigma F150W F160W, which signal Ly-alpha break near red edge filters, implying z~12. This object (Maisie's...
We present a catalog of visual like H-band morphologies ∼ 50.000 galaxies (H f 160w < 24.5) in the 5 CANDELS fields (GOODS-N, GOODS-S, UDS, EGS and COSMOS).Morphologies are estimated with Convolutional Neural Networks (ConvNets).The median redshift sample is z >∼ 1.25.The algorithm trained on GOODS-S for which classifications publicly available then applied to other 4 fields.Following main morphology classification scheme, our model retrieves probabilities each galaxy having spheroid, disk,...
Abstract We report the discovery of an accreting supermassive black hole at z = 8.679. This galaxy, denoted here as CEERS_1019, was previously discovered a Ly α -break galaxy by Hubble with redshift from Keck. As part Cosmic Evolution Early Release Science (CEERS) survey, we have observed this source JWST/NIRSpec, MIRI, NIRCam, and NIRCam/WFSS uncovered plethora emission lines. The H β line is best fit narrow plus broad component, where latter measured 2.5 σ FWHM ∼1200 km s −1 . conclude...
Abstract We report on the discovery of two low-luminosity, broad-line active galactic nuclei (AGNs) at z > 5 identified using JWST NIRSpec spectroscopy from Cosmic Evolution Early Release Science (CEERS) survey. detect broad H α emission in spectra both sources, with FWHM 2060 ± 290 km s −1 and 1800 200 , resulting virial black hole (BH) masses that are 1–2 dex below those existing samples luminous quasars 5. The first source, CEERS 2782 = 5.242, is 2–3 fainter than known similar...
Abstract We present the data release and reduction process for Epoch 1 NIRCam observations Cosmic Evolution Early Release Science Survey (CEERS). These consist of imaging in six broadband filters (F115W, F150W, F200W, F277W, F356W F444W) one medium-band filter (F410M) over four pointings, obtained parallel with primary CEERS MIRI observations. reduced JWST Calibration Pipeline, custom modifications steps designed to address additional features challenges data. Here we provide a detailed...
We present rest-frame optical data of the compact z = 5.55 galaxy GS_3073 obtained using integral field spectroscopy mode Near-InfraRed Spectrograph on board James Webb Space Telescope. The galaxy’s prominent broad components in several hydrogen and helium lines (though absent forbidden lines) v detection a large equivalent width He II λ 4686, EW(He ) ∼20 Å, unambiguously identify it as an active galactic nucleus (AGN). measured gas phase metallicity Z / ⊙ ∼0.21 −0.04 +0.08 , which is lower...
We present JWST/NIRSpec prism spectroscopy of seven galaxies selected from the Cosmic Evolution Early Release Science Survey (CEERS) NIRCam imaging with photometric redshifts z_phot>8. measure emission line z=7.65 and 8.64 for two galaxies, z=9.77(+0.37,-0.29) 10.01(+0.14,-0.19) others via detection continuum breaks consistent Lyman-alpha opacity a mostly neutral intergalactic medium. The presence (absense) strong (strong lines) give high confidence that these are at z>9.6, but break-derived...
Lyman Break Galaxy (LBG) candidates at z>10 are rapidly being identified in JWST/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources expected drop out bluer filters while well detected redder filters. However, here we show that dust-enshrouded star-forming galaxies lower redshifts (z<7) may also mimic near-infrared (near-IR) colors LBGs, representing potential contaminants LBG candidate samples. First, analyze...
We present rest-frame optical emission-line flux ratio measurements for five $z>5$ galaxies observed by the JWST Near-Infared Spectrograph (NIRSpec) in SMACS 0723 Early Release Observations. add several quality-control and post-processing steps to NIRSpec pipeline reduction products order ensure reliable relative calibration of emission lines that are closely separated wavelength, despite uncertain \textit{absolute} spectrophotometry current version reductions. Compared $z\sim3$ literature,...
The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate unprecedented detail nature of optical/near-IR faint, mid-IR bright sources, HST-dark galaxies among them. We gather data from CEERS survey EGS, jointly with HST data, analyze spatially resolved optical-to-mid-IR spectral energy distributions (SEDs) estimate both photometric redshifts 2 dimensions stellar populations properties a pixel-by-pixel basis. select 138 F150W-F356W>1.5 mag, F356W<27.5...
Abstract We present a comprehensive analysis of the evolution morphological and structural properties large sample galaxies at z = 3–9 using early James Webb Space Telescope (JWST) CEERS NIRCam observations. Our consists 850 > 3 detected in both Hubble (HST)/WFC3 JWST/NIRCam images, enabling comparison HST JWST morphologies. conduct set visual classifications, with each galaxy classified three times. also measure quantitative morphologies across all filters. find that have wide diversity...
Abstract We present the ultraviolet luminosity function and an estimate of cosmic star formation rate density at 8 < z 13 derived from deep NIRCam observations taken in parallel with MIRI Deep Survey Hubble Ultra Field (HUDF), covering field 2. Our (40 hr) reach F277W magnitude 30.8 (5 σ ), more than 2 mag deeper JWST public data sets already analyzed to find high-redshift galaxies. select a sample 44 > galaxy candidates based on their dropout nature F115W and/or F150W filters, high...