A5024399429- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Advanced Vision and Imaging
- Gaussian Processes and Bayesian Inference
- Impact of Light on Environment and Health
- Photocathodes and Microchannel Plates
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Image Processing Techniques and Applications
- Optical Coatings and Gratings
- Digital Storytelling and Education
- Remote Sensing in Agriculture
- Elevator Systems and Control
- Nuclear and radioactivity studies
- Atomic and Molecular Physics
- Pulsars and Gravitational Waves Research
- Dark Matter and Cosmic Phenomena
Yale University
2017-2024
Northwestern University
2023-2024
Advanced Neural Dynamics (United States)
2023
Dalhousie University
2015-2020
National Oceanic and Atmospheric Administration
2020
Abstract The James Webb Space Telescope is now detecting early black holes (BHs) as they transition from “seeds” to supermassive BHs. Recently, Bogdan et al. reported the detection of an X-ray luminous BH, UHZ-1, with a photometric redshift at z > 10. Such extreme source this very high provides new insights on seeding and growth models for BHs given short time available formation growth. Harnessing exquisite sensitivity JWST/NIRSpec, here we report spectroscopic confirmation UHZ-1 =...
Abstract The James Webb Space Telescope is revealing a new population of dust-reddened broad-line active galactic nuclei (AGN) at redshifts z ≳ 5. Here we present deep NIRSpec/Prism spectroscopy from the Cycle 1 Treasury program Ultradeep NIRSpec and NIRCam ObserVations before Epoch Reionization (UNCOVER) 15 AGN candidates selected to be compact, with red continua in rest-frame optical but blue slopes UV. From photometry alone, they could have been dominated by dusty star formation or an...
Abstract Deep observations with the James Webb Space Telescope (JWST) have revealed an emerging population of red pointlike sources that could provide a link between postulated supermassive black hole seeds and observed quasars. In this work, we present JWST/NIRSpec spectrum from JWST Cycle 1 UNCOVER Treasury survey massive accreting at z = 8.50 displaying clear broad-line component as inferred H β line FWHM 3439 ± 413 km s −1 , typical region active galactic nucleus (AGN). The AGN nature...
With just a month of data, JWST is already transforming our view the Universe, revealing and resolving starlight in unprecedented populations galaxies. Although ``HST-dark" galaxies have previously been detected at long wavelengths, these observations generally suffer from lack spatial resolution which limits ability to characterize their sizes morphologies. Here we report on first subset HST-dark population that are bright with JWST/NIRCam (4.4$\mu$m<24.5mag) very faint or even invisible...
Abstract Observations with the James Webb Space Telescope (JWST) have uncovered numerous faint active galactic nuclei (AGN) at z ∼ 5 and beyond. These objects are key to our understanding of formation supermassive black holes (SMBHs), their coevolution host galaxies, as well role AGN in cosmic reionization. Using photometric colors size measurements, we perform a search for compact red an array blank deep JWST/NIRCam fields totaling ∼640 arcmin 2 . Our careful selection yields 260 reddened...
We report the discovery and constrain physical conditions of interstellar medium highest-redshift millimeter-selected dusty star-forming galaxy (DSFG) to date, SPT-S J031132-5823.4 (hereafter SPT0311-58), at $z=6.900 +/- 0.002$. SPT0311-58 was discovered via its 1.4mm thermal dust continuum emission in South Pole Telescope (SPT)-SZ survey. The spectroscopic redshift determined through an ALMA 3mm frequency scan that detected CO(6-5), CO(7-6) [CI](2-1), subsequently confirmed by detections...
Abstract Galaxy sizes and their evolution over cosmic time have been studied for decades serve as key tests of galaxy formation models. However, at z ≳ 1 these studies limited by a lack deep, high-resolution rest-frame infrared imaging that accurately traces stellar mass distributions. Here, we leverage the new capabilities James Webb Space Telescope (JWST) to measure 4.4 μ m ∼1000 galaxies with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi>...
Abstract Observations of high-redshift galaxies provide a critical direct test to the theories early galaxy formation, yet date, only three have been spectroscopically confirmed at z > 12. Due strong gravitational lensing over wide area, cluster field A2744 is ideal for searching earliest galaxies. Here we present JWST/NIRSpec observations two galaxies: robust detection <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>z</mml:mi>...
Abstract The first JWST data revealed an unexpected population of red galaxies that appear to have redshifts z ∼ 7–9 and high masses M * ≳ 10 ☉ . Here we fit Sérsic profiles the F200W NIRCam images 13 massive galaxy candidates Labbé et al., determine their structural parameters. Satisfactory fits were obtained for nine galaxies. We find effective radii are extremely small, ranging from r e 80 pc 300 pc, with a mean 〈 〉 ≈ 150 pc. For apparent stellar masses, smaller than any other has been...
Abstract Recent studies have indicated that the ratio between half-mass and half-light radii, r mass / light , varies significantly as a function of stellar redshift, complicating interpretation ubiquitous − M * relation. To investigate, in this study we construct color profiles ∼3000 galaxies at 1 < z 2 with <?CDATA $\mathrm{log}{M}_{* }/{M}_{\odot }\gt 10.25$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:msub> <mml:mrow>...
Abstract We report the spectroscopic confirmation of a massive ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mo>⋆</mml:mo> </mml:msub> stretchy="true">/</mml:mo> <mml:mo>⊙</mml:mo> stretchy="false">)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>10.34</mml:mn> <mml:msubsup> <mml:mo>±</mml:mo> <mml:mn>0.07</mml:mn> <mml:mn>0.06</mml:mn> </mml:msubsup>...
Abstract With the wavelength coverage, sensitivity, and high spatial resolution of JWST, it is now possible to peer through dust attenuation probe rest-frame near-infrared (NIR) stellar structures extremely dusty galaxies at cosmic noon ( z ∼ 1−3). In this paper we leverage combined Atacama Large Millimeter/submillimeter Array (ALMA) JWST/Hubble Space Telescope coverage in A2744 study multiwavelength (0.5−4.4 μ m) 11 submillimeter detected 0.9−3.5 that are fainter than bright “classical”...
Galaxies grow inefficiently, with only a few percent of the available gas converted into stars each free-fall time. Feedback processes, such as outflowing winds driven by radiation pressure, supernovae or supermassive black hole accretion, can act to halt star formation if they heat expel supply. We report molecular outflow launched from dust-rich star-forming galaxy at redshift 5.3, one billion years after Big Bang. The reaches velocities up 800 km/s relative galaxy, is resolved multiple...
Abstract We use CEERS JWST/NIRCam imaging to measure rest-frame near-IR light profiles of 435 M ⋆ > 10 ⊙ galaxies in the redshift range 0.5 < z 2.3. compare resulting 1.5–2 μ m half-light radii ( R NIR ) with stellar half-mass <?CDATA ${R}_{{{M}}_{\star }}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>R</mml:mi> </mml:mrow> <mml:mi mathvariant="italic">M</mml:mi> <mml:mo>⋆</mml:mo> </mml:msub> </mml:math> derived multicolor...
JWST is revealing a new population of dust-reddened broad-line active galactic nuclei (AGN) at redshifts $z\gtrsim5$. Here we present deep NIRSpec/Prism spectroscopy from the Cycle 1 Treasury program UNCOVER 15 AGN candidates selected to be compact, with red continua in rest-frame optical but blue slopes UV. From NIRCam photometry alone, they could have been dominated by dusty star formation or AGN. show that majority compact sources are AGN: $60\%$ definitive evidence for H$\alpha$ FWHM$\,...
Abstract In this Letter, we measure the rest-frame optical and near-infrared sizes of 10 quiescent candidates at 3 < z 5, first reported by Carnall et al. We use James Webb Space Telescope Near-Infrared Camera F277W F444W imaging obtained through public CEERS Early Release Science program imcascade , an astronomical fitting code that utilizes multi-Gaussian expansion, to carry out our size measurements. When compared extrapolation rest-optical size–mass relations for galaxies lower...
Abstract We present a measurement of the low-mass quiescent size–mass relation at cosmic noon (1 < z 3) from JWST PRIMER and UNCOVER treasury surveys, which highlights two distinct classes galaxies. While massive population is well studied these redshifts, end has been previously underexplored due to lack observing facilities with sufficient sensitivity spatial resolution. select conservative sample galaxy candidates using rest-frame UVJ colors specific star formation rate criteria...
Abstract We present JWST NIRSpec prism spectroscopy of lensed galaxies at z ≳ 9 found behind the massive galaxy cluster Abell 2744 in UNCOVER Cycle 1 Treasury Program. confirm redshift via emission lines and/or Ly α break for 10 = 8.50–13.08 down to M V −17.3. achieve a 100% confirmation rate > candidates reported H. Atek et al. Using six sources with multiple line detections, we find that offsets estimates between and alone can be ±0.2, raising caution designing future follow-up...
It is often claimed that overdensities of (or even individual bright) submillimetre-selected galaxies (SMGs) trace the assembly most-massive dark matter structures in Universe. We test this claim by performing a counts-in-cells analysis mock SMG catalogues derived from Bolshoi cosmological simulation to investigate how well associations underlying structure. find SMGs exhibit relatively complex bias: some regions high overdensity are underdense terms mass, and contain no SMGs. Because their...
The abundance and demographics of dark matter substructure are important for many areas in astrophysics cosmological N-body simulations have been the primary tool used to investigate them. However, it has recently become clear that subject numerical artefacts, which hampers a proper treatment tidal evolution subhaloes. Unfortunately, no analytical models accurately describe subhalo exist either. We therefore present library idealized, high-resolution individual subhaloes can be calibrate...
We present a description of the Dragonfly Wide Field Survey (DWFS), deep photometric survey wide area sky. The DWFS covers 330 $\mathrm{deg}^2$ in equatorial GAMA fields and Stripe 82 SDSS $g$ $r$ bands. It is carried out with 48-lens Telephoto Array, telescope that optimized for detection low surface brightness emission. main goal to study dwarf galaxy population beyond Local Group. In this paper, we describe design show early results. reach $1\sigma$ depths $\mu_g\approx 31$ mag...