A5049344844- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Optical Polarization and Ellipsometry
- Atomic and Subatomic Physics Research
- Advanced Fiber Laser Technologies
- Radio Astronomy Observations and Technology
- Medical Imaging Techniques and Applications
- Particle physics theoretical and experimental studies
- Advanced Statistical Methods and Models
- Plant Water Relations and Carbon Dynamics
- Computer Graphics and Visualization Techniques
- Photonic Crystal and Fiber Optics
University of Illinois Urbana-Champaign
2023-2024
University of Iowa
2018-2023
Abstract We present a comparative study of active galactic nuclei (AGN) between galaxy pairs and isolated galaxies with the final data release MaNGA integral field spectroscopic survey. build sample 391 kinematic within footprint survey select AGN using survey's spectra. use comoving volume densities samples to quantify effects that tidal interactions have on triggering nuclear accretion. Our hypothesis is pair contains are triggered by not only stochastic accretion but also tidally induced...
In galaxy mergers, dual quasars - two actively accreting supermassive black holes (SMBHs) provide a unique opportunity to study the interplay between dynamics and quasar activity. However, very little is known about their molecular gas, which fuels star formation this study, we map kinematics of cold gas in J0749+2255, 3.8 kpc separation at z=2.17 using Atacama Large Millimeter Array (ALMA) Band 4. We detect CO(4-3)650um, shows remarkably complex morphological kinematic structures. While...
Abstract The search for dual supermassive black holes (SMBHs) is of immense interest in modern astrophysics. Galaxy mergers may fuel and produce SMBH pairs. Actively accreting pairs are observed as quasars, which vital probes growth. Dual quasars at cosmic noon not well characterized. Gaia observations have enabled a novel technique to identify kiloparsec scales based on the small jitters light centroid two vary stochastically. We present first detailed study z = 2.17, 0 <mml:math...
Abstract We compare the radial profiles of specific star formation rate (sSFR) in a sample 169 star-forming galaxies close pairs with those mass-matched control SDSS-IV MaNGA survey. find that sSFR is centrally enhanced (within one effective radius) interacting by ∼0.3 dex and there weak suppression outskirts ∼0.1 dex. stack difference for five stellar-mass bins range log( M / ⊙ ) = 9.0–11.5 enhancement has no dependence on stellar mass. The same result obtained when comparison are matched...
Abstract Dual quasars—two active supermassive black holes at galactic scales—represent crucial objects for studying the impact of galaxy mergers and quasar activity on star formation rate (SFR) within their host galaxies, particularly cosmic noon when SFR peaks. We present JWST/MIRI mid-infrared integral field spectroscopy J074922.96+225511.7, a dual with projected separation 3.8 kpc redshift z = 2.17. detect spatially extended [Fe ii ] 5.34 μ m polycyclic aromatic hydrocarbon (PAH) 3.3...
Merger simulations predict that tidally induced gas inflows can trigger kpc-scale dual active galactic nuclei (dAGN) in heavily obscured environments. Previously with the Very Large Array, we have confirmed four dAGN redshifts between $0.04 < z 0.22$ and projected separations 4.3 9.2 kpc SDSS Stripe 82 field. Here, present $Chandra$ X-ray observations spatially resolve these compare their multi-wavelength properties to those of single AGN from literature. We detect emission six individual...
Abstract We have identified 105 galaxy pairs at z ∼ 0.04 with the MaNGA integral-field spectroscopic data. The projected separations between 1 and 30 kpc, are selected to radial velocity offsets less than 600 km s −1 stellar mass ratio 0.1 1. pair fraction increases both physical size of unit mass, consistent theoretical expectations. provide best-fit analytical function find that ∼3% M * galaxies in close pairs. For isolated paired galaxies, active galactic nuclei (AGNs) using emission-line...
We test the merger-induced dual active galactic nuclei (dAGN) paradigm using a sample of 35 radio galaxy pairs from SDSS Stripe 82 field. Using Keck optical spectroscopy, we confirm 21 have consistent redshifts, constituting kinematic pairs; remaining 14 are line-of-sight projections. classify spectral signatures via emission line ratios, equivalent widths, and excess power above star-formation predicted outputs. find 6 galaxies classified as LINERs 7 AGN/starburst composites. Most retired...
Abstract Dual quasars at small physical separations are an important precursor phase of galaxy mergers, ultimately leading to the coalescence two supermassive black holes. Starting from a sample dual and/or lensed quasar candidates discovered using astrometric jitter in Gaia data, we present pilot case study one most promising yet puzzling candidate cosmic noon ( z ∼ 1.8). Using multiwavelength imaging and spectroscopy X-ray radio, test whether SDSS J0823+2418 system is individual bound pair...
The search for dual supermassive black holes (SMBHs) is of immense interest in modern astrophysics. Galaxy mergers may be an important route to fuel and produce SMBH pairs. Actively accreting pairs can observed as a quasar, which are vital probes growth. Gaia observations have enabled novel technique systematically such quasars at previously unreachable sub-kpc scales, based on the small jitters light centroid two vary stochastically. Here we present first detailed study 0.46'', 3.8 kpc...
Lyman continuum and line emission are thought to be important agents in the reionization of early universe. Haro 11 is a rare example local galaxy which Ly$\alpha$ have escaped without being absorbed or scattered by ambient gas dust, potentially as consequence feedback from its X-ray sources. We build on our previous Chandra analysis analyzing three new observations. Our subpixel spatial reveals that two previously known sources each better modelled ensembles at least 2 unresolved point The...
Abstract We report Hubble Space Telescope (HST) Wide Field Camera 3 deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift z = 2.575, was recently reported as triple-quasar candidate with subarcsecond separations (∼0.″25) based on selection from Gaia astrometry and follow-up Keck adaptive optics–assisted integral field unit spectroscopy. Our new HST reveals the presence fourth point-like component ∼0.″9 away triple system. Additionally, we detect an edge-on disk...
Dual quasars, two active supermassive black holes at galactic scales, represent crucial objects for studying the impact of galaxy mergers and quasar activity on star formation rate (SFR) within their host galaxies, particularly cosmic noon when SFR peaks. We present JWST/MIRI mid-infrared integral field spectroscopy J074922.96+225511.7, a dual with projected separation 3.8 kilo-parsec redshift $z$ 2.17. detect spatially extended [Fe II] 5.34$\rm \mu$m polycyclic aromatic hydrocarbon (PAH)...
We present Gemini/GMOS and HST/STIS optical spectra for 27 dual quasar candidates selected based on their variability-induced astrometric noise or double detections in Gaia (the VODKA project). From this follow-up, we spectroscopically identify 10 star superpositions 8 dual/lensed quasars. Among the remaining targets, 2 are likely quasars additional radio imaging, while rest with unknown companions. Notably, WISE J1649+0812 is a newly confirmed projected separation of 5 kpc at $z=1.39$...
Dual Active Galactic Nuclei (dual AGNs), a phase in some galaxy mergers during which both central supermassive black holes (SMBHs) are active, expected to be key observable stage leading up SMBH mergers. Constraining the population of dual AGNs nearby and high-z universe has proven elusive until very recently. We present multi-wavelength follow-up campaign confirm nature sample 20 candidate at cosmic noon (z~2) from VODKA sample. Through combination Hubble Space Telescope (HST) Very Large...
Dual quasars at small physical separations are an important precursor phase of galaxy mergers, ultimately leading to the coalescence two supermassive black holes. Starting from a sample dual/lensed quasar candidates discovered using astrometric jitter in Gaia data, we present pilot case study one most promising yet puzzling candidate dual cosmic noon (z$\sim$1.8). Using multi-wavelength imaging and spectroscopy X-ray radio, test whether J0823+2418 system is individual bound pair...
We report Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) deep IR (F160W) imaging of SDSS J1608+2716. This system, located at a redshift z=2.575, was recently reported as triple quasar candidate with subarcsecond separations ($\sim0.25''$) based on selection from Gaia astrometry and follow-up Keck adaptive optics-assisted integral field unit spectroscopy. Our new HST reveals the presence fourth point-like component $\sim0.9''$ away system. Additionally, we detect an edge-on disk...
The hierarchical structure formation paradigm predicts the of pairs supermassive black holes in merging galaxies. When both (or one) members SMBH pair are unobscured AGNs, system can be identified as a dual offset) AGN. Quantifying abundance these AGN functions separation, redshift and host properties is crucial to understanding fueling broad context galaxy formation. High Latitude Wide Area Survey with Roman, its unprecedented combination sensitivity, spatial resolution, area NIR wavelength...
We present a comparative study of active galactic nuclei (AGN) between galaxy pairs and isolated galaxies with the final data release MaNGA integral field spectroscopic survey. build sample 391 kinematic within footprint survey select AGN using survey's spectra. use comoving volume densities samples to quantify effects that tidal interactions have on triggering nuclear accretion. Our hypothesis is pair contains are triggered by not only stochastic accretion but also tidally induced...
We test the merger-induced dual active galactic nuclei (dAGN) paradigm using a sample of 35 radio galaxy pairs from SDSS Stripe 82 field. Using Keck optical spectroscopy, we confirm 21 have consistent redshifts, constituting kinematic pairs; remaining 14 are line-of-sight projections. classify spectral signatures via emission line ratios, equivalent widths, and excess power above star-formation predicted outputs. find 6 galaxies classified as LINERs 7 AGN/starburst composites. Most retired...