A5018432266- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Optical Systems and Laser Technology
- Advanced Semiconductor Detectors and Materials
- Health Systems, Economic Evaluations, Quality of Life
- Contact Dermatitis and Allergies
- Primary Care and Health Outcomes
- Superconducting and THz Device Technology
- Planetary Science and Exploration
- Science Education and Pedagogy
- Solar and Space Plasma Dynamics
- Space Exploration and Technology
- Acute Myocardial Infarction Research
- Optical Polarization and Ellipsometry
- Radio Astronomy Observations and Technology
The University of Texas at San Antonio
2015-2024
National Astronomical Observatory of Japan
2016-2024
National Institutes of Natural Sciences
2018-2024
W.M. Keck Observatory
2022
Marshall Space Flight Center
2021
University of Lincoln
2021
Nottinghamshire Healthcare NHS Foundation Trust
2020
University of Florida
2006-2018
University of Exeter
2018
University of Victoria
2018
We used the CLUMPY torus models and a Bayesian approach to fit infrared spectral energy distributions ground-based high angular resolution mid-infrared spectroscopy of 13 nearby Seyfert galaxies. This allowed us put tight constraints on model parameters such as viewing angle i, radial thickness Y, size cloud distribution σtorus, average number clouds along equatorial rays N0. found that i is not only parameter controlling classification galaxy into type 1 or 2. In principle, 2s could be...
We present new mid-infrared imaging data for three Type-1 Seyfert galaxies obtained with T-ReCS on the Gemini-South Telescope at subarcsecond resolution. Our aim is to enlarge sample studied in a previous work compare properties of and Type-2 tori using clumpy torus models Bayesian approach fit infrared (IR) nuclear spectral energy distributions. Thus, considered here comprises 7 Type-1, 11 Type-2, 3 intermediate-type Seyferts. The unresolved IR emission 1 can be reproduced by combination...
We present subarcsecond resolution mid-infrared (mid-IR) photometry in the wavelength range from 8 to 20 micron of eighteen Seyfert galaxies, reporting high spatial nuclear fluxes for entire sample. construct spectral energy distributions (SEDs) that AGN dominates adding near-IR measurements literature at similar angular resolution. The IR SEDs intermediate-type Seyferts are flatter and higher 10 18 ratios than those 2. fit individual with clumpy torus models using in-house-developed...
Recent theoretical and observational works indicate the presence of a correlation between star formation rate (SFR) active galactic nuclei (AGN) luminosity (and, therefore, black hole accretion rate) Seyfert galaxies. This suggests physical connection gas forming stars on kpc scales sub-pc that is feeding hole. We compiled largest sample galaxies to date with high angular resolution (0.4-0.8 arcsec) mid-infrared (8-13 micron) spectroscopy. The includes 29 drawn from AGN Revised Shapley-Ames...
We present the first results of Galaxy Activity, Torus and Outflow Survey (GATOS), a project aimed at understanding properties dusty molecular tori their connection to host galaxy in nearby Seyfert galaxies. Our expands range AGN luminosities Eddington ratios covered by previous surveys Seyferts conducted ALMA allows us study gas feeding feedback cycle combined sample 19 Seyferts. used obtain new images emission dust using CO(3-2) HCO+(4-3) lines as well underlying continuum 870 microns with...
Abstract We quantify the luminosity contribution of active galactic nuclei (AGNs) to 12 μ m, mid-infrared (MIR; 5–38 m), and total IR (5–1000 m) emission in local AGNs detected all-sky 70 month Swift /Burst Alert Telescope (BAT) ultrahard X-ray survey. decompose spectral energy distributions (SEDs) 587 objects into AGN starburst components using templates for an torus a star-forming galaxy. This enables us recover from including low-luminosity end, down <?CDATA...
Polycyclic Aromatic Hydrocarbons (PAHs) are carbon-based molecules that ubiquitous in a variety of astrophysical objects and environments. In this work, we use JWST/MIRI MRS spectroscopy three Seyferts to compare their nuclear PAH emission with star-forming regions. This study represents the first its kind using sub-arcsecond angular resolution data local luminous (Lbol>10^44.46 erg/s) on wide wavelength coverage (4.9-28.1 micron). We present an analysis properties by comparing observed...
The ionisation cones of NGC 5728 have a deficit molecular gas based on millimetre observations CO (2-1) emission. Although photoionisation from the active nucleus may lead to suppression this transition, warm can still be present. We report detection eight mid-infrared rotational H 2 lines throughout central kiloparsec, including cones, using integral field spectroscopic with JWST/MIRI MRS. line ratios, characteristic power-law temperature distribution, indicate that is warmest where it...
We present spatially-resolved, near-diffraction-limited 10 micron spectra of the nucleus Seyfert 2 galaxy NGC 1068, obtained with Michelle, mid-IR imager and spectrometer on 8.1 m Gemini North telescope. The cover central 6.0" x 0.4" ionization cones at a spatial resolution approximately (approx. 30 parsecs). extracted in steps along slit reveal striking variations continuum slope, silicate feature profile depth, fine structure line fluxes subarcsecond scales, illustrating unprecedented...
We present Gran Telescopio CANARIAS CanariCam 8.7 μm imaging and 7.5–13 spectroscopy of six local systems known to host an active galactic nucleus (AGN) have nuclear star formation. Our main goal is investigate whether the molecules responsible for 11.3 polycyclic aromatic hydrocarbon (PAH) feature are destroyed in close vicinity AGN. detect PAH emission regions galaxies as well extended over a few hundred parsecs. The equivalent width (EW) shows minimum at but increases with increasing...
We present results from the fitting of infrared (IR) spectral energy distributions 21 active galactic nuclei (AGNs) with clumpy torus models. compiled high spatial resolution (∼0.3–0.7 arcsec) mid-IR (MIR) N-band spectroscopy, Q-band imaging, and nuclear near- MIR photometry literature. Combining these observations, far-IR photometry, models enables us to put constraints on properties geometry. divide sample into three types according broad line region (BLR) properties: type-1s, type-2s...
We present ALMA Band 6 $^{12}$CO(2--1) line and rest-frame 232GHz continuum observations of the nearby Compton-thick Seyfert galaxy NGC5643 with angular resolutions 0.11-0.26arcsec (9-21pc). The CO(2--1) integrated map reveals emission from nuclear circumnuclear region a two-arm spiral extending 10arcsec on each side. kinematics can be fitted rotating disk, although there are regions large residual velocities and/or velocity dispersions. profiles these show two different components. One is...
Context. The unified model of active galactic nuclei (AGN) claims that the properties AGN depend on viewing angle observer with respect to a toroidal distribution dust surrounding nucleus. Both mid-infrared (MIR) attenuation and continuum luminosity are expected be related associated torus. Therefore, isolating nuclear component is essential for studying MIR emission AGN.
ALMA observations have revealed nuclear dusty molecular disks or tori with characteristic sizes 15−40 pc in the few Seyferts and low -luminosity AGN that been studied so far. These structures are generally decoupled both morphologically kinematically from host galaxy disk. We present of CO(2–1) CO(3–2) gas transitions associated (sub-) millimeter continua nearby Seyfert 1.5 NGC 3227 angular resolutions 0.085 − 0.21″ (7–15 pc). On large scales, cold shows circular motions as well streaming on...
We compare mid-IR and ALMA far-IR images of 12 nearby Seyferts selected from GATOS. The unresolved emission contributes more than 60% the nuclear in most galaxies. By contrast, 870micron continuum is mostly resolved typically along torus equatorial direction (Paper I, Garcia-Burillo et al. 2021). Eddington ratios hydrogen column densities NH half sample are favorable to launching polar and/or dusty winds, according simulations. Six show extended as traced by NLR perpendicular emission. In a...
We use JWST/MIRI MRS spectroscopy of a sample six local obscured type 1.9/2 active galactic nuclei (AGN) to compare their nuclear mid-IR absorption bands with the level obscuration traced by X-rays. This study is first sub-arcsecond angular resolution data AGN investigate wide wavelength coverage (4.9-28.1 $μ$m). All show 9.7 $μ$m silicate band in absorption. strength and 18 features torus model predictions. The observed are generally well explained clumpy smooth models. report detection 6...
Abstract The superb image quality, stability, and sensitivity of JWST permit deconvolution techniques to be pursued with a fidelity unavailable ground-based observations. We present an assessment several approaches improve quality mitigate the effects complex point-spread function (PSF). optimal method is determined by using WebbPSF simulate JWST’s PSF MIRISim multiband JWST/Mid-Infrared Imager Module (MIRIM) observations toy model active galactic nucleus (AGN). Five different algorithms are...
We present contemporary optical and infrared spectroscopic observations of the type IIn SN 1998S covering period between 3 127 days after discovery. During first week spectra are characterized by prominent broad H, He C iii/N iii emission lines with narrow peaks, superimposed on a very blue continuum (T∼24 000 K). In following two weeks vanished, together components H lines. Broad, blueshifted absorption appeared in spectra. The temperature also dropped to ∼14 K. By end month spectrum...
Defining needs is difficult due to the inherent complexity of concept 'need', so it not surprising that numerous definitions have been proposed. 'Health' consists a wide range characteristics 'health needs' ought include personal and social care, health accommodation, finance, education, employment leisure, transport access. Target-driven standards in areas care with high political profile appear be replacing universal provision clinical need; this major change warrants re-evaluation...
We present high-resolution mid-infrared (MIR) imaging, nuclear spectral energy distributions (SEDs), and archival Spitzer spectra for 22 low-luminosity active galactic nuclei (LLAGNs; Lbol ≲ 1042 erg s−1). Infrared (IR) observations may advance our understanding of the accretion flows in LLAGNs, fate obscuring torus at low rates, and, perhaps, star formation histories these objects. However, while comprehensively studied higher-luminosity Seyferts quasars, IR properties LLAGNs have not yet...
We have obtained subarcsecond mid-IR images of a sample debris disks within 100 pc. For our 19 A-type disk candidates chosen for their IR excess, we resolved, the first time, five sources plus previously resolved around HD 141569. Two other in been ruled out as since time selection. Three six inferred radii 1–4 AU (HD 38678, 71155, and 181869), one source has an radius ∼10–30 141569). Among with detections excess emission, 71155 appears to be comparable size (r ∼ 2 AU) solar system's...
We report on the discovery of a significant excess candidate H$\alpha $ emitters (HAEs) in field radio galaxy 4C 23.56 at z$=$ 2.483. Using MOIRCS near-infrared imager Subaru Telescope we found 11 emission-line galaxies to flux limit $\sim$7.5 $\times$ 10$^{-17}\ $erg s$^{-1}\ $cm$^{-2}$, which is about 5-times from expected counts with an $\sim$ 3-$\sigma$ significance. Three these have been spectroscopically confirmed as redshifted 2.49. The distribution sky tightly confined 1.2-Mpc-radius...