A5022527645- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Mathematics and Applications
- Geological Formations and Processes Exploration
- History and Theory of Mathematics
- Astronomical Observations and Instrumentation
- Geochemistry and Elemental Analysis
- Geological and Geochemical Analysis
- Calibration and Measurement Techniques
- Advanced Mathematical Theories and Applications
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Geochemistry and Geologic Mapping
- Geophysics and Sensor Technology
- Heavy metals in environment
- Atomic and Molecular Physics
Sunset Laboratory (United States)
2025
Korea Astronomy and Space Science Institute
2019-2023
Universidad Nacional Autónoma de México
2018
National Institute of Astrophysics, Optics and Electronics
2014-2017
Instituto Venezolano de Investigaciones Científicas
2006-2009
Abstract This is the second in a series of papers devoted to exploring set six dusty models active galactic nuclei (AGN) with available spectral energy distributions. These are smooth torus by Fritz et al., clumpy Nenkova Hönig & Kishimoto, two-phase Siebenmorgen Stalevski and wind model Kishimoto. The first paper explores discrimination among parameter restriction using synthetic spectra. Here we perform fitting sample 110 AGN drawn from Swift /BAT survey Spitzer /IRS spectroscopic...
Abstract We investigate the capabilities of mid-infrared instrument (MIRI) James Webb Space Telescope (JWST) to advance our knowledge AGN dust using spectral fitting technique on an collection 21 nearby (z < 0.05) (7 type-1 and 14 type-2) observations obtained with medium resolution spectroscopy (MRS) mode. This includes publicly available data from collaboration Galactic Activity, Torus, Outflow Survey (GATOS). developed a tool named MRSPSFisol that decomposes MRS cubes into...
We present nuclear spectral energy distributions (SEDs) from 1 to 18 μm of a small sample nearby, nearly face-on and undisturbed Seyfert galaxies without prominent dust lanes. These SEDs probe the central ∼35 pc galaxies, on average, include photometric spectroscopic infrared (IR) data. use these SEDs, clumpy torus models Nenkova et al. Bayesian approach study sensitivity different IR wavelengths parameters. find that high angular resolution 8–13 spectroscopy alone reliably constrains number...
We present mid-infrared (MIR; 7.5–13.5 μm) imaging and spectroscopy observations obtained with the CanariCam (CC) instrument on 10.4-m Gran Telescopio CANARIAS for a sample of 20 nearby, MIR bright X-ray luminous quasi-stellar objects (QSOs). find that majority QSOs emission is unresolved at angular scales ∼0.3 arcsec, corresponding to physical ≲600 pc. higher-spatial resolution CC spectra have similar shapes those Spitzer/IRS, hence we can assume are not heavily contaminated by extended in...
We present 31.5 micron imaging photometry of 11 nearby Seyfert galaxies observed from the Stratospheric Observatory For Infrared Astronomy (SOFIA) using Faint Object infraRed CAmera for SOFIA Telescope (FORCAST). tentatively detect extended 31 emission first time in our sample. In combination with this new data set, subarcsecond resolution 1-18 and 7.5-13 spectroscopic observations were used to compute nuclear spectral energy distribution (SED) each galaxy. found that turnover torus does not...
Abstract Several authors have claimed that less luminous active galactic nuclei (AGNs) are not capable of sustaining a dusty torus structure. Thus, gradual resizing the is expected when AGN luminosity decreases. Our aim to examine mid-infrared observations local AGNs different luminosities for and disappearance torus. We applied decomposition method described by Hernán-Caballero et al. sample ∼100 Spitzer /IRS spectra low-luminosity powerful Seyferts in order decontaminate component from...
We have carried out extensive and detailed photoionization modelling to successfully constrain the locations of different emission-line galaxies in optical mid-infrared diagnostic diagrams. Our model grids cover a wide range parameter space for active galaxy continuum starburst with stellar population laws metallicities. compare predicted AGN star formation line ratios [Ne iii]15.56 μm/[Ne ii]12.81 μm [O iv]25.89 observed values, find that best fit galactic nucleus (AGN) is via two-zone...
Abstract At distances from the active galaxy nucleus where ambient temperature falls below ∼1500–1800 K, dust is able to survive. It thus possible have a large dusty structure present that surrounds nucleus. This first of two papers aiming at comparing six torus models with available spectral energy distributions, namely, Fritz et al., Nenkova Hönig & Kishimoto, Siebenmorgen Stalevski and Kishimoto. In this paper we use synthetic spectra explore discrimination between these under which...
We studied the circumnuclear MIR emission in a sample of 19 local active galactic nuclei (AGN) with high spatial resolution spectra using T-ReCS (Gemini) and CanariCam (GTC), together IRS/Spitzer observations. measured flux equivalent width for 11.3 micron PAH feature [SIV] line as function galactocentric distance. This allowed to study star formation (SF) at sub-kpc scales from nucleus large nearby AGN. The could be tracing AGN radiation field within few thousand times sublimation radius...
Abstract Dust close (∼few pc) to the accretion disk in active galactic nuclei (AGNs) is key understanding many of their observational signatures, and it tracing how AGN fed or even evolves along its duty cycle. With estimated sizes less than 10 pc, as constrained by mid-IR (MIR) high angular resolution data, only superb spatial achieved ALMA able actually image this dusty structure. However, question regarding dust at submillimeter wavelengths (sub-mm, typical band) behaves contest, arises....
We measure the 10 and $18\mu$m silicate features in a sample of 67 local ($z<0.1$) type 1 active galactic nuclei (AGN) with available {\it Spitzer} spectra dominated by non-stellar processes. find that $10\mu$m feature peaks at $10.3^{+0.7}_{-0.9}\mu$m strength (Si$_{p}$ = ln f$_{p}$(spectrum)/f$_{p}$(continuum)) $0.11^{+0.15}_{-0.36}$, while one $17.3^{+0.4}_{-0.7}\mu$m $0.14^{+0.06}_{-0.06}$. select from this sources strongest 10$\mu$m ($\sigma_{Si_{10\mu m}}>0.28$, objects). carry out...
We present an analysis of the nuclear infrared (IR, 1.6 to 18 $\mu$m) emission ultraluminous IR galaxy UGC 5101 derive properties its active galactic nucleus (AGN) and obscuring material. use new mid-IR high angular resolution ($0.3-0.5$ arcsec) imaging using Si-2 filter ($\lambda_{C}=8.7\, \mu$m) $7.5-13$ $\mu$m spectroscopy taken with CanariCam (CC) on 10.4m Gran Telescopio CANARIAS. also archival HST/NICMOS Subaru/COMICS Spitzer/IRS spectroscopy. estimate near- unresolved by modelling...
We investigate the evolutionary connection between local IR-bright galaxies ($\log L_{\rm IR}\ge 11.4\,L_\odot$) and quasars. use high angular resolution ($\sim$ 0.3-0.4 arcsec $\sim$ few hundred parsecs) $8-13\,\mu$m ground-based spectroscopy to disentangle AGN mid-IR properties from those of star formation. The comparison nuclear $11.3\,\mu$m PAH feature emission that measured with Spitzer/IRS indicates formation is extended over a kpc in galaxies. contribution total IR luminosity lower...
We continue a systematic study of chemical abundances the strontium filament found in ejecta η Carinae. To this end we interpret emission spectrum Sc ii and Cr using multilevel non-local thermodynamic equilibrium models. Since atomic data for these ions were previously unavailable, carry out ab initio calculations radiative transition rates electron impact excitation rate coefficients. The observed is consistent with an density order 107 cm−3 temperature between 6000 7000 K, conditions...
Surficial sediments from 56 stations on the Orinoco Delta offshore zone were analyzed by x-ray fluorescence spectrometry for aluminum (Al), barium (Ba), calcium (Ca), chromium (Cr), copper (Cu), iron (Fe), hafnium (Hf), magnesium (Mg), manganese (Mn), sodium (Na), nickel (Ni), rubidium (Rb), silicon (Si), strontium (Sr), vanadium (V), zinc (Zn), and zirconium (Zr). The resulting compositional data set was subjected to factorial cluster analysis. results demonstrated that two different...
We combine new (NGC 1275, NGC 4151, and 5506) previously published (Cygnus A, Mrk 231, 1068) sub-arcsecond resolution mid-infrared (MIR; 8-13 $μ$m) imaging- spectro-polarimetric observations of six Seyfert galaxies using CanariCam on the 10.4-m Gran Telescopio CANARIAS. These reveal a diverse set physical processes responsible for nuclear polarization, permit characterization origin MIR polarimetric signature active galactic nuclei (AGN). For all radio quiet objects, we found that...
In order to understand the diversity of classes observed in active galactic nuclei (AGN), a geometrically and optically thick torus gas dust is required obscure central engine depending on line sight observer. We perform simultaneous fitting X-ray mid-infrared (mid-IR) spectra investigate if same structure could produce both emissions and, this case, obtain better constraints for physical parameters torus. we take advantage fact that show important signatures obscuration. used nearby type-2...
Abstract Thanks to ground-based infrared and submillimeter observations the study of dusty torus nearby active galactic nuclei has greatly advanced in last years. With aim further investigating nuclear mid-infrared emission archetypal Seyfert 2 galaxy NGC 1068, here we present a fitting N - Q -band Michelle/Gemini spectra. We initially test several available spectral energy distribution (SED) libraries, including smooth, clumpy two-phase models, disk+wind model. find that spectra 1068 cannot...
Abstract We examine star formation activity in a distant ( z < 0.1) and flux-limited sample of quasars (QSOs). Midinfrared (MIR) spectral diagnostics at high spatial resolution (∼0.4 arcsec) yield rates (SFRs) the inner regions (∼300 pc–1 kpc) for 13 20 members. group these objects according to size probed by angular spectroscopy, with characteristic scales <0.7 ∼0.7–1 kpc. Using polycyclic aromatic hydrocarbon (PAH) feature 11.3 μ m, we measure SFRs around 0.2 1.6 M ⊙ yr −1 . also...
To study the nuclear ($\lesssim1\,$kpc) dust of nearby ($z<0.1$) type 1 Quasi Stellar Objects (QSOs) we obtained new near-infrared (NIR) high angular resolution ($\sim0.3$ arcsec) photometry in H and Ks bands, for 13 QSOs with available mid-infrared (MIR) spectroscopy ($\sim7.5-13.5\,\mu$m). We find that most NIR emission is unresolved. subtract contribution from accretion disk, which decreases ($\sim35\%$) to MIR ($\sim2.4\%$). also estimate these percentages assuming a bluer disk...
ABSTRACT As part of the Early Science Large Millimeter Telescope projects, we report detection nine double-peaked molecular lines, produced by a rotating torus, in ultraluminous infrared galaxies (ULIRG) – Compton-thick active galactic nuclei (AGN) galaxy UGC 5101. The lines correspond to transitions HCN, HCO+, HNC, N2H+, CS, C18O, 13CO, and two CN lines; plus C2H that is blend six lines. redshift search receiver spectra covers 73–113 GHz frequency window. Low- high-density gas tracers torus...
ABSTRACT Combining the cloudy photoionization code with updated stellar population synthesis results, we simultaneously model MIR $\rm{[Ne {}{\small III}]}/\rm{[Ne II}]}$ versus $\rm{[O IV}]}/\rm{[Ne III}]}$, MIR-FIR IV}]}/\rm{[O III}]}$ and classical BPT diagnostic diagrams. We focus on properties of optically classified H ii galaxies that lie in normal star forming zone diagram. find a small fraction our models this zone, but most them correspond to lowest explored metallicity, Z* =...
We present MIR sub-arcsec observations of Mrk 1383, a nearby QSO, part sample QSOs currently being observed with the 10.4 m Gran Telescopio de Canarias (GTC). The radial profile QSO is analyzed and we find that most emission unresolved (\theta ~ 0.4", 600 pc) consistent previous measurements from Spitzer 4"). derive spectral energy distribution (SED) nuclear emission, relatively uncontaminated by starlight, combining literature as first step towards characterizing torus parameters in this QSO.
Combining the {\sc Cloudy} photoionization code with updated stellar population synthesis results, we simultaneously model MIR $\neiii/\neii$ vs. $\oiv/\neiii$, MIR-FIR $\oiv/\oiii$ and classical BPT diagnostic diagrams. We focus on properties of optically classified \hii\,galaxies that lie in normal star forming zone diagram. find a small fraction our models this zone, but most them correspond to lowest explored metallicity, \zstar\,=\,0.0002, at age $\sim1$ Gyr. This value \zstar\,is, by...