A5080597901- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Statistical and numerical algorithms
- Reservoir Engineering and Simulation Methods
- Spectroscopy and Laser Applications
- Gaussian Processes and Bayesian Inference
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
- Relativity and Gravitational Theory
- Astro and Planetary Science
- Heat Transfer Mechanisms
- Atomic and Molecular Physics
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
University of Oxford
2022-2025
University of St Andrews
2021-2023
Leiden University
2020
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...
We analyze JWST NIRSpec+MIRI/MRS observations of the infrared (IR) gas-phase molecular bands most enshrouded source (D1) within interacting system and luminous IR galaxy II Zw 096. report detection rovibrational lines H 2 O ν = 1 − 0 (∼5.3–7.2 μm) 12 CO (∼4.45–4.95 in D1. The band shows R- P-branches emission spectrum P-branch R-branch absorption. absorption unveils an IR-bright embedded compact D1 broad component features a highly turbulent environment. From both bands, we also identified...
ABSTRACT We present an analysis of the combined NIRSpec and MIRI spectra dusty galaxies between 1.5 28 $\mu$m rest-frame by implementing a differential extinction model, where strength varies across spectrum as different layers obscuring dust are probed. Our model is able to recover 2D distribution temperature extinction, which allows inference physical nature in these environments. show that necessary reproduce four highly obscured Luminous Infrared Galaxies observed with IFU MRS, simple...
Abstract The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from inner accretion disk broad emission line region and dusty torus. As part this campaign, Swift performed daily monitoring for approximately 15 months, obtaining observations in X-rays six UV/optical filters. X-ray shows that was significantly fainter state than previous observations, with only brief flare where it reached prior flux levels. spectrum...
We analyze JWST NIRSpec+MIRI/MRS observations of the infrared (IR) polycyclic aromatic hydrocarbon (PAH) features in central regions (∼0.26 at 6,μm; ∼50-440,pc depending on source) local luminous IR galaxies. In this work, we examine effect nuclear obscuration PAH deeply obscured nuclei, predominantly found galaxies, and compare these nuclei with ``normal'' star-forming regions. extend previous work to include shorter wavelength ratios now available spectral range. introduce a new diagnostic...
Mid-infrared (mid-IR) gas-phase molecular bands are powerful diagnostics of the warm interstellar medium. We report James Webb Space Telescope detection CO v = 1 − 0 (4.4 5.0 μm) and H 2 O ν (5.0 7.8 ro-vibrational bands, both in absorption, toward “s2” core southwest nucleus merging galaxy VV 114 E. All lines up to J low 33 ( E ≈ 3000 K) detected, as well a forest 13 0, 2600 K). The highest-excitation blueshifted by ∼180 km s −1 relative extended cloud, which is traced rotational 3 2) 346...
We measure the black hole mass and investigate accretion flow around local ($z=0.0502$) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H$\beta$ lags linewidths from which we estimate a of $\log \left(M_{\bullet}/\mathrm{M}_{\odot} \right) = 7.0$, uncertain by $\sim0.4$ dex. High cadence photometric over two years Las Cumbres Observatory lightcurves in 7 optical bands suitable for intensive continuum reverberation mapping. identify variability on timescales. Slower...
ABSTRACT We present a systematic study of mid-infrared spectra galaxies including star-forming and active galactic nuclei observed with JWST MIRI-MRS NIRSpec-IFU. focus on the relative variations 3.3, 6.2, 7.7, 11.3, 12.7, 17 $\mu$m polycyclic aromatic hydrocarbon (PAH) features within spatially resolved regions NGC 3256, 7469, VV 114, II Zw96, 5728. Using theoretical PAH models extending our earlier work, we introduce new diagnostic involving feature. To determine drivers band in galaxies,...
Compact Obscured Nuclei (CONs) potentially hide extreme supermassive black hole (SMBH) growth behind large column densities of gas/dust. We present a spectroscopic analysis the heavily obscured nucleus and surrounding environment eastern region nearby ($z = 0.02007$) interacting galaxy VV 114 with JWST Mid-InfraRed Instrument (MIRI). model spectrum from 4.9 - 28 $\mu$m to extract Polycyclic Aromatic Hydrocarbon (PAH) emission underlying continuum. find that NE (A) is highly where low PAH...
ABSTRACT Polar dust has been discovered in a number of local active galactic nuclei (AGN), with radiation-driven torus models predicting wind to be its main driver. However, little is known about characteristics, spatial extent, or connection the larger scale outflows. We present first JWST/MIRI study aimed at imaging polar by zooming on centre ESO 428-G14, part Galaxy Activity, Torus, and Outflow Survey (GATOS) survey AGN. detect extended mid-infrared (MIR) emission within 200 pc from...
We present a new method of modelling time-series data based on the running optimal average (ROA). By identifying effective number parameters for ROA model, in terms shape and width its window function times accuracies data, we enable Bayesian analysis, optimising width, along with other model parameters, by minimising Information Criterion (BIC) sampling joint posterior parameter distributions using MCMC methods. For analysis quasar lightcurves, our implementation can measure time delays...
ABSTRACT Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditional methods, especially before advent JWST. In this work, we employ Principal Component Analysis (PCA) tomography analyse JWST/NIRSpec IFU data three nearby luminous infrared galaxies (LIRGs), namely, NGC 3256 N, S, and 7469. We detect signature rotation...
We study the 3.4 − 4.4 μm fundamental rovibrational band of H 3 + , a key tracer ionization molecular interstellar medium (ISM), in sample 12 local ( d < 400 Mpc) (ultra)luminous infrared galaxies ((U)LIRGs) observed with JWST/NIRSpec. The P Q and R branches are detected 13 out 20 analyzed regions within these (U)LIRGs, which increases number extragalactic detections by factor 6. For first time ISM, is emission; we detect this emission three regions. In remaining ten regions, seen...
We analyze JWST MIRI/MRS IFU observations of three Seyferts and showcase the intriguing polycyclic aromatic hydrocarbon (PAH) emission characteristics in regions $\sim 500\,\rm pc$ scales over or around their active galactic nuclei (AGN). Combining model predictions measurements PAH features other infrared lines, we find that central containing a high fraction neutral PAHs with small sizes, e.g., those ESO137-G034, are highly heated environments, due to collisional shock heating, hard...
Context. Compact Obscured Nuclei (CONs) are an extreme phase of galaxy evolution where rapid supermassive black hole growth and$/$or compact star-forming activity is completely obscured by gas and dust. Aims. We investigate the properties CONs in mid-infrared explore techniques aimed at identifying these objects such as through equivalent width (EW) ratios their Polycyclic Aromatic Hydrocarbon (PAH) features. Methods. model Spitzer spectra decomposing continua into nuclear components from...
Context. The inner few au region of planet-forming disks is a complex environment. High angular resolution observations have key role in understanding the disk structure and dynamical processes at work. Aims. In this study we aim to characterize mid-infrared brightness distribution young intermediate-mass star HD 163296, from VLTI/MATISSE observations. Methods. We use geometric models fit data. Our include smoothed ring, flat with cavity, 2D Gaussian. can account for inclination azimuthal...
Polar dust has been discovered in a number of local Active Galactic Nuclei (AGN), with radiation-driven torus models predicting wind to be its main driver. However, little is known about characteristics, spatial extent, or connection the larger scale outflows. We present first JWST/MIRI study aimed at imaging polar by zooming onto heart ESO 428-G14, part GATOS survey AGN. clearly detect extended mid-infrared (MIR) emission within 200 pc from nucleus. This structure co-linear radio jet and...
Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditional methods, especially before advent JWST. In this work we employ Principal Component Analysis (PCA) tomography analyse JWST/NIRSpec IFU data 3 nearby luminous infrared galaxies (LIRGs), namely, NGC 3256 N, S and 7469. We detect signature rotation second...
We present a systematic study of mid-infrared spectra galaxies including star-forming and Active Galactic Nuclei observed with JWST MIRI-MRS NIRSpec-IFU. focus on the relative variations 3.3, 6.2, 7.7, 11.3, 12.7 17 micron Polycyclic Aromatic Hydrocarbon (PAH) features within spatially resolved regions NGC 3256, 7469, VV 114, II Zw96 5728. Using theoretical PAH models extending our earlier work, we introduce new diagnostic involving feature. To determine drivers band in galaxies, compare...
We study the 3.4-4.4$\mu$m fundamental rovibrational band of H3+, a key tracer ionization molecular interstellar medium (ISM), in sample 12 local (d< 400 Mpc) ultra/luminous infrared galaxies (U/LIRGs) observed with JWST/NIRSpec. The P, Q, and R branches are detected 13 out 20 analyzed regions within these U/LIRGs, which increases number extragalactic H3+ detections by factor 6. For first time ISM, is emission 3 regions. In remaining 10 regions, seen absorption. absorptions produced toward...
We analyze JWST NIRSpec$+$MIRI/MRS observations of the infrared (IR) gas-phase molecular bands most enshrouded source (D1) within interacting system and luminous IR galaxy II Zw 096. report detection rovibrational lines H$_2$O $\nu_2$=1-0 ($\sim$5.3-7.2 $\mu$m) $^{12}$CO $\nu$=1-0 ($\sim$4.45-4.95 in D1. The CO band shows R- P-branches emission spectrum P-branch R-branch absorption. absorption unveils an IR-bright embedded compact D1 broad component features a highly turbulent environment....
We present an analysis of the combined NIRSpec and MIRI spectra dusty galaxies between 1.5 - 28 $\mu$m restframe by implementing a differential extinction model, where strength varies across spectrum as different layers obscuring dust are probed. Our model is able to recover 2D distribution temperature which allows inference physical nature in these environments. show that necessary reproduce 4 highly obscured Luminous Infrared Galaxies observed with IFU MRS, simple screen or uniformly mixed...
As part of the guaranteed time observations program Mid-Infrared Characterization Of Nearby Iconic galaxy Centers (MICONIC), we used medium-resolution spectrometer (MRS) Instrument (MIRI) on board JWST to study nearby merger NGC6240. We aim characterise dual active galactic nuclei (AGN), ionised gas outflows and main properties interstellar medium over a mapped area 6.6"x7.7". obtained integral field spectroscopic mid-infrared data NGC6240, resolving both for first in full 5-28{\mu}m...
We measure the black hole mass and investigate accretion flow around local ($z=0.0502$) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H$β$ lags linewidths from which we estimate a of $\log \left(M_{\bullet}/\mathrm{M}_{\odot} \right) = 7.0$, uncertain by $\sim0.4$ dex. High cadence photometric over two years Las Cumbres Observatory lightcurves in 7 optical bands suitable for intensive continuum reverberation mapping. identify variability on timescales. Slower...