Mark Dickinson
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View article: Testing Photometric Techniques for Measuring the Rest-frame UV Spectral Slope against JWST PRISM Spectroscopy
Testing Photometric Techniques for Measuring the Rest-frame UV Spectral Slope against JWST PRISM Spectroscopy Open
We present a sample of 53 galaxy spectra at z SPEC ∼ 5–12 from the JWST CEERS and RUBIES surveys, combining NIRSpec PRISM spectroscopy with NIRCam photometry. We aim to use these data to establish best practices for measuring the UV spectr…
View article: Optical Strong Line Ratios Cannot Distinguish between Stellar Populations and Accreting Black Holes at High Ionization Parameters and Low Metallicities
Optical Strong Line Ratios Cannot Distinguish between Stellar Populations and Accreting Black Holes at High Ionization Parameters and Low Metallicities Open
High-redshift observations from JWST indicate that optical strong line ratios do not carry the same constraining power as they do at low redshifts. Critically, this prevents a differentiation between stellar and black hole accretion-driven…
View article: <b>E</b> mission-line Diagnostics at <i>z</i> > 4: [O <scp>iii</scp> ] <i>λ</i> 4364/H <i>γ</i> versus [Ne <scp>iii</scp> ] <i>λ</i> 3870/[O <scp>ii</scp> ] <i>λ</i> 3730
<b>E</b> mission-line Diagnostics at <i>z</i> > 4: [O <span>iii</span> ] <i>λ</i> 4364/H <i>γ</i> versus [Ne <span>iii</span> ] <i>λ</i> 3870/[O <span>ii</span> ] <i>λ</i> 3730 Open
We use JWST Near-Infrared Spectrograph observations from the Cosmic Evolution Early Release survey, GLASS-JWST ERS (GLASS), and JWST Advanced Deep Extragalactic Survey to measure rest-frame optical emission-line ratios of 89 galaxies at z …
View article: Witnessing downsizing in the making: quiescent and breathing galaxies at the dawn of the Universe
Witnessing downsizing in the making: quiescent and breathing galaxies at the dawn of the Universe Open
We conduct a systematic search for quiescent galaxies at in six extragalactic deep fields observed with NIRCam, with the goal of extracting their physical and statistical features in a uniform and self-consistent manner…
View article: The Prevalence of Bursty Star Formation in Low-mass Galaxies at <i>z</i> = 1–7 from H <i>α</i> -to-UV Diagnostics
The Prevalence of Bursty Star Formation in Low-mass Galaxies at <i>z</i> = 1–7 from H <i>α</i> -to-UV Diagnostics Open
We present an analysis of the bursty star formation histories (SFHs) of 346 star-forming galaxies at 1 ≲ z < 7, selected from JWST/NIRSpec G395M and PRISM spectroscopy provided by the Cosmic Evolution Early Release Science (or CEERS) and R…
View article: A Metal-free Galaxy at <i>z</i> = 3.19? Evidence of Late Population III Star Formation at Cosmic Noon
A Metal-free Galaxy at <i>z</i> = 3.19? Evidence of Late Population III Star Formation at Cosmic Noon Open
Star formation from metal-free gas, the hallmark of the first generation of Population III (Pop III) stars, was long assumed to occur only in the very early Universe. We report the discovery of Metal-Pristine Galaxy COSMOS Redshift 3 (MPG-…
View article: Very Bright, Very Blue, and Very Red: JWST CAPERS Analysis of Highly Luminous Galaxies with Extreme Ultraviolet Slopes at <i>z</i> = 10
Very Bright, Very Blue, and Very Red: JWST CAPERS Analysis of Highly Luminous Galaxies with Extreme Ultraviolet Slopes at <i>z</i> = 10 Open
We present JWST/NIRSpec PRISM observations of three luminous ( M UV < −20) galaxies at z ∼ 10 observed with the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS) Cycle 3 program. These galaxies exhibit extreme UV slopes compared to …
View article: The $M_{\rm BH}-M_{*}$ Relationship at $3
The $M_{\rm BH}-M_{*}$ Relationship at $3 Open
JWST has identified a large population of faint, broad-line active galactic nuclei (AGN) in the early universe that are powered by black holes (BHs) that often appear overmassive relative to their host galaxies. In this study, we examine t…
View article: The Prevalence of Bursty Star Formation in Low-Mass Galaxies at z=1-7 from Hα-to-UV Diagnostics
The Prevalence of Bursty Star Formation in Low-Mass Galaxies at z=1-7 from Hα-to-UV Diagnostics Open
We present an analysis of bursty star-formation histories (SFHs) of 346 star-forming galaxies at $1\lesssim z<7$, selected from JWST/NIRSpec G395M and PRISM spectroscopy provided by the CEERS and RUBIES surveys. We analyze the correlation …
View article: The Rise of the Galactic Empire: Ultraviolet Luminosity Functions at <i>z</i> ∼ 17 and <i>z</i> ∼ 25 Estimated with the MIDIS+NGDEEP Ultra-deep JWST/NIRCam Data Set
The Rise of the Galactic Empire: Ultraviolet Luminosity Functions at <i>z</i> ∼ 17 and <i>z</i> ∼ 25 Estimated with the MIDIS+NGDEEP Ultra-deep JWST/NIRCam Data Set Open
We present a sample of six F200W and three F277W dropout sources identified as 16 < z < 25 galaxy candidates using the deepest JWST/NIRCam data to date (5 σ depths ∼31.5 mag at ≥2 μ m), provided by the MIRI Deep Imaging Survey and the Next…
View article: JWST+ALMA reveal the ISM kinematics and stellar structure of MAMBO-9, a merging pair of DSFGs in an overdense environment at $z=5.85$
JWST+ALMA reveal the ISM kinematics and stellar structure of MAMBO-9, a merging pair of DSFGs in an overdense environment at $z=5.85$ Open
We present high-resolution ALMA [CII] 158 micron observations and JWST/NIRCam+MIRI imaging of MAMBO-9, a pair of optically-dark, dusty star-forming galaxies at $z=5.85$. MAMBO-9 is among the most massive, gas-rich, and actively star-formin…
View article: CAPERS-LRD-z9: A Gas-enshrouded Little Red Dot Hosting a Broad-line Active Galactic Nucleus at <i>z</i> = 9.288
CAPERS-LRD-z9: A Gas-enshrouded Little Red Dot Hosting a Broad-line Active Galactic Nucleus at <i>z</i> = 9.288 Open
We present CAPERS-LRD-z9, a little red dot (LRD) that we confirm to be a z = 9.288 broad-line active galactic nucleus (BLAGN). First identified as a high-redshift LRD candidate from PRIMER NIRCam photometry, follow-up NIRSpec/PRISM spectro…
View article: The Dual Nature of GHZ9: Coexisting Active Galactic Nuclei and Star Formation Activity in a Remote X-Ray Source at <i>z</i> = 10.145
The Dual Nature of GHZ9: Coexisting Active Galactic Nuclei and Star Formation Activity in a Remote X-Ray Source at <i>z</i> = 10.145 Open
We present James Webb Space Telescope (JWST)/NIRSpec PRISM spectroscopic characterization of GHZ9 at z = 10.145 ± 0.010, currently the most distant source detected by the Chandra X-ray Observatory. The spectrum reveals several UV high-ioni…
View article: CAPERS Observations of Two UV-bright Galaxies at <i>z</i> > 10. More Evidence for Bursting Star Formation in the Early Universe
CAPERS Observations of Two UV-bright Galaxies at <i>z</i> > 10. More Evidence for Bursting Star Formation in the Early Universe Open
We present the first results from the CANDELS-Area Prism Epoch of Reionization Survey (CAPERS), utilizing PRISM observations with the JWST/NIRSpec microshutter assembly in the PRIMER-UDS field. With just 14% of the total planned data volum…
View article: Very bright, very blue, and very red: JWST CAPERS analysis of highly luminous galaxies with extreme UV slopes at $\mathbf{z = 10}$
Very bright, very blue, and very red: JWST CAPERS analysis of highly luminous galaxies with extreme UV slopes at $\mathbf{z = 10}$ Open
We present JWST/NIRSpec PRISM observations of three luminous ($M_{\rm UV}<-20$) galaxies at $z\sim10$ observed with the CAPERS Cycle 3 program. These galaxies exhibit extreme UV slopes compared to typical galaxies at $z=10$. Of the three s…
View article: Investigating the Growth of Little Red Dot Descendants at z<4 with the JWST
Investigating the Growth of Little Red Dot Descendants at z<4 with the JWST Open
One of JWST's most remarkable discoveries is a population of compact red galaxies known as Little Red Dots (LRDs). Their existence raises many questions about their nature, origin, and evolution. These galaxies show a steep decline in numb…
View article: Testing Photometric Techniques for Measuring the Rest-Frame UV Spectral Slope Against JWST PRISM Spectroscopy
Testing Photometric Techniques for Measuring the Rest-Frame UV Spectral Slope Against JWST PRISM Spectroscopy Open
We present a sample of 53 galaxy spectra at z_spec ~ 5-12 from the JWST CEERS and RUBIES surveys, combining NIRSpec PRISM spectroscopy with NIRCam photometry. We aim to use these data to establish best practices for measuring the UV spectr…
View article: Clinical Insights into Idiopathic Stroke in Young Adults: A Multi-Case Review
Clinical Insights into Idiopathic Stroke in Young Adults: A Multi-Case Review Open
Incidence of stroke has risen in young adults under 45 years of age globally. In this case series, we present three cases of stroke in young adults without pre-existing medical conditions. Our first case is a 43-year-old female cruise line…
View article: Broad-line AGNs at 3.5 < <i>z</i> < 6: The Black Hole Mass Function and a Connection with Little Red Dots
Broad-line AGNs at 3.5 < <i>z</i> < 6: The Black Hole Mass Function and a Connection with Little Red Dots Open
We present a sample of 62 H α detected broad-line active galactic nuclei (BLAGNs) at redshifts 3.5 < z < 6.8 using data from the CEERS and RUBIES surveys. We select these sources directly from JWST/NIRSpec G395M/F290LP spectra. We use a mu…
View article: CEERS: Possibly forging the first dust grains in the universe
CEERS: Possibly forging the first dust grains in the universe Open
Aims. This work aims to investigate the coevolution of metals and dust for 173 galaxies at 4.0 < z ≤ 11.4 spectroscopically observed by the NIRSpec instrument onboard the James Webb Space Telescope (JWST) in the Cosmic Evolution Early Rele…
View article: The Rise of Faint, Red Active Galactic Nuclei at <i>z</i> > 4: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields
The Rise of Faint, Red Active Galactic Nuclei at <i>z</i> > 4: A Sample of Little Red Dots in the JWST Extragalactic Legacy Fields Open
We present a sample of 341 “little red dots” (LRDs) spanning the redshift range z ∼ 2–11 using data from the CEERS, PRIMER, JADES, UNCOVER, and NGDEEP surveys. Unlike past use of color indices to identify LRDs, we employ continuum slope fi…
View article: AGNBoost: A Machine Learning Approach to AGN Identification with JWST/NIRCam+MIRI Colors and Photometry
AGNBoost: A Machine Learning Approach to AGN Identification with JWST/NIRCam+MIRI Colors and Photometry Open
We present AGNBoost, a machine learning framework utilizing XGBoostLSS to identify AGN and estimate redshifts from JWST NIRCam and MIRI photometry. AGNBoost constructs 121 input features from 7 NIRCam and 4 MIRI bands-including magnitudes,…
View article: The Abundance and Properties of Barred Galaxies out to <i>z</i> ∼ 4 Using JWST CEERS Data
The Abundance and Properties of Barred Galaxies out to <i>z</i> ∼ 4 Using JWST CEERS Data Open
We present the first estimate of the observed fraction and properties of bars out to z ∼ 4 using JWST CEERS NIRCam images. We analyze 1770 galaxies with M ⋆ > 10 10 M ⊙ at 0.5 ≤ z ≤ 4 and identify barred galaxies from 839 moderately inclin…
View article: Galaxies in the Epoch of Reionization Are All Bark and No Bite -- Plenty of Ionizing Photons, Low Escape Fractions
Galaxies in the Epoch of Reionization Are All Bark and No Bite -- Plenty of Ionizing Photons, Low Escape Fractions Open
Early results from JWST suggest that epoch-of-reionization (EoR) galaxies produce copious ionizing photons, which, if they escape efficiently, could cause reionization to occur too early. We study this problem using JWST imaging and prism …
View article: Compact dust-obscured star formation and the origin of the galaxy bimodality
Compact dust-obscured star formation and the origin of the galaxy bimodality Open
Context. The combined capabilities of the James Webb Space Telescope/Near Infrared Camera (NIRCam) and the Hubble Space Telescope/Advanced Camera for Surveys (ACS) instruments provide high-angular-resolution imaging from the ultraviolet to…
View article: Pushing JWST to the extremes: search and scrutiny of bright galaxy candidates at z$\simeq$15-30
Pushing JWST to the extremes: search and scrutiny of bright galaxy candidates at z$\simeq$15-30 Open
We designed customized Lyman-break color selection techniques to identify galaxy candidates in the redshift ranges $15 \leq z \leq 20$ and $20 \leq z \leq 28$. The selection was performed on the ASTRODEEP-JWST multi-band catalogs of the CE…
View article: The Cosmic Evolution Early Release Science Survey (CEERS)
The Cosmic Evolution Early Release Science Survey (CEERS) Open
We present the Cosmic Evolution Early Release Science (CEERS) Survey, a 77.2 hr Director’s Discretionary Early Release Science Program. CEERS demonstrates, tests, and validates efficient extragalactic surveys using coordinated, overlapping…
View article: NGDEEP: The Star Formation and Ionization Properties of Galaxies at 1.7 < z < 3.4
NGDEEP: The Star Formation and Ionization Properties of Galaxies at 1.7 < z < 3.4 Open
We use JWST/NIRISS slitless spectroscopy from the Next Generation Deep Extragalactic Exploratory Public (NGDEEP) Survey to investigate the physical condition of 178 star-forming galaxies at 1.7 < z < 3.4. At these redshifts, the deep NGDEE…
View article: The Lyman Continuum Escape Fraction of Star-forming Galaxies at 2.4 ≲ <i>z</i> ≲ 3.0 from UVCANDELS
The Lyman Continuum Escape Fraction of Star-forming Galaxies at 2.4 ≲ <i>z</i> ≲ 3.0 from UVCANDELS Open
The UltraViolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey Fields (UVCANDELS) survey is a Hubble Space Telescope (HST) Cycle-26 Treasury Program, allocated in total 164 orbits of primary Wide-Field Camera…
View article: Emission-Line Diagnostics at z>4: [OIII]λ4363/Hγ
Emission-Line Diagnostics at z>4: [OIII]λ4363/Hγ Open
We use JWST Near-Infrared Spectrograph (NIRSpec) observations from the the Cosmic Evolution Early Release survey (CEERS), GLASS-JWST ERS (GLASS), and JWST Advanced Deep Extragalactic Survey (JADES) to measure rest-frame optical emission-li…