N. Reddy

The AURORA Survey: Determining the Production Mechanism for OI $λ 8449$ Emission in Star-forming Galaxies at Cosmic Noon

Leonardo Clarke, Alice E. Shapley, Zhiwei Shao +11

We analyze deep JWST/NIRSpec observations of 58 star-forming galaxies at $1.3 < z < 4.8$ in the AURORA survey to investigate the origin of the permitted OI $λ 8449$ emission feature.…

ALMA Chemical Evolution (ACE) survey: the dust content of subsolar metallicity galaxies at cosmic noon

M. Solimano, I. Shivaei, G. Popping +11

Dust plays a key role in galaxy evolution by influencing star formation and shaping the observed spectrum of galaxies. However, at z~2 (cosmic noon) our knowledge of the dust mass…

ALMA Chemical Evolution (ACE) survey: The gas fundamental metallicity relation at cosmic noon

I. Langan, I. Shivaei, G. Popping +11

Chemical enrichment shapes how galaxies form and evolve. The gas-phase metallicity is directly linked to the stellar mass, star formation rate, and cold gas of the interstellar med…

MSA-3D: A Diversity of Dust Attenuation Profiles Across the Epoch of Thin Disk Emergence

Ivana Barišić, Tucker Jones, Naveen Reddy +13

We present spatially resolved measurements of dust attenuation and star formation in 18 main-sequence star-forming galaxies at z $\sim$ 1 from the MSA-3D survey, obtained by mapping…

Emission-line Diagnostics at $z ≳ 2$ : A Probe of the Ionizing Spectrum and $α$ Enhancement Beyond Cosmic Noon

Leonardo Clarke, Natalie Lam, Alice E. Shapley +5

We analyze several key rest-optical emission-line ratios in a sample of 828 galaxies as well as composite spectra from JADES DR3 in the range $1.4 < z < 7$ . These emission-line rat…

The AURORA Survey: The Mass -- Metallicity and Fundamental Metallicity Relations at $z \sim 2.3$ Based Purely on Direct $T_{e}$ Metallicities

Ali Ahmad Khostovan, Ryan L. Sanders, Alice E. Shapley +14

We present new constraints on the Mass -- Metallicity (MZR) and Fundamental Metallicity Relations (FMR) using a sample of 34 galaxies at $1.38 \leq z \leq 3.5$ (median $z = 2.28$ ). The…

The AURORA Survey: Constraining Chemical Enrichment Pathways at Cosmic Noon with Argon Abundances

Jack Foley, Alice Shapley, Ryan Sanders +11

We present argon abundances from a sample of 46 star-forming galaxies at $z = 2 - 3.5$ from the Assembly of Ultradeep Rest-Optical Observations Revealing Astrophysics (AURORA) program.…

The ALPINE-CRISTAL-JWST Survey: Stellar and nebular dust attenuation of main-sequence galaxies at z~4-6

Akiyoshi Tsujita, Seiji Fujimoto, Andreas Faisst +39

Characterizing dust attenuation is crucial for revealing the intrinsic physical properties of galaxies. We present an analysis of dust attenuation in 18 spectroscopically confirmed…

The AURORA Survey: Ionizing Photon Production Efficiency with Minimal Nebular Dust Attenuation Systematics

Anthony J. Pahl, Alice Shapley, Naveen A. Reddy +11

We present ionizing photon production efficiencies ( $ξ_{ion}$ ) for 63 z=1.5-6.9 star-forming galaxies using precise nebular dust attenuation corrections from the JWST/AURORA su…

The Star-forming Main Sequence and Bursty Star-formation Histories at $z > 1.4$ in JADES and AURORA

Leonardo Clarke, Alice E. Shapley, Natalie Lam +5

We analyze JWST spectroscopic and HST+JWST photometric observations of 659 star-forming galaxies at $1.4 < z < 9$ from DR3 of the JADES survey and the AURORA Cycle 1 program. We measur…

astro-ph.GA2025★ 2 cited

A Uniform Analysis of Gas-phase Metallicity Evolution with 1-3 Gyr Time Sampling over the Past 12 Billion Years

Shweta Jain, Ryan L. Sanders, Ali Ahmad Khostovan +6

We present a systematic investigation of the evolution of the mass-metallicity relation (MZR) and fundamental metallicity relation (FMR) using uniform metallicity diagnostics acros…

astro-ph.GA2025★ 4 cited

The AURORA Survey: High-Redshift Empirical Metallicity Calibrations from Electron Temperature Measurements at z=2-10

Ryan L. Sanders, Alice E. Shapley, Michael W. Topping +29

We present detections of auroral emission lines of [OIII], [OII], [SIII], and [SII] in deep JWST/NIRSpec spectroscopy for 41 star-forming galaxies at $z = 1.4 - 7.2$ from the AURORA su…

The AURORA Survey: Robust Helium Abundances at High Redshift Reveal A Subpopulation of Helium-Enhanced Galaxies in the Early Universe

Danielle A. Berg, Ryan L. Sanders, Alice E. Shapley +16

We present the first robust helium (He) abundance measurements in star-forming galaxies at redshifts $1.6 ≲ z ≲ 3.3$ using deep, moderate-resolution JWST/NIRSpec spectr…

MOSDEF-3D: Keck/OSIRIS Maps of the Ionized ISM in $z \sim 2$ Galaxies

Natalie Lam, Alice E. Shapley, Ryan L. Sanders +8

We present spatially-resolved rest-frame optical emission line maps of four galaxies at $z \sim 2$ observed with Keck/OSIRIS to study the physical conditions of the ISM at Cosmic N…

astro-ph.GA2025★ 5 cited

The JWST/AURORA Survey: Multiple Balmer and Paschen Emission Lines for Individual Star-forming Galaxies at z=1.5-4.4. I. A Diversity of Nebular Attenuation Curves and Evidence for Non-Unity Dust Covering Fractions

Naveen A. Reddy, Alice E. Shapley, Ryan L. Sanders +14

We present the nebular attenuation curves and dust covering fractions for 24 redshift z=1.5-4.4 star-forming galaxies using multiple Balmer and Paschen lines from the JWST/AURORA s…

The AURORA Survey: Tracing Galactic Outflows at $z ≳ 2.5$ with JWST/NIRSpec NUV Absorption Lines

Emily Kehoe, Alice E. Shapley, Ryan L. Sanders +13

We probe galactic-scale outflows in star-forming galaxies at $z ≳ 2.5$ drawn from the \textit{JWST}/NIRSpec AURORA program. For the first time, we directly compare outflow prop…

astro-ph.GA2025★ 32 cited

Stacking PANCAKEZ: sPectroscopic Analysis with NirspeC stAcKs in the Epoch of reioniZation. Weak ISM Absorption and Implications for Ionizing Photon Escape at $z \sim 7$

Kelsey S. Glazer, Tucker Jones, Yuguang Chen +7

We present a spectral stacking analysis of galaxies at $z \geq 6$ observed with the James Webb Space Telescope (JWST). We curate a sample of $64$ galaxies spanning redshifts $z_{\rm…

No [CII] or dust detection in two Little Red Dots at z $_{spec}$ > 7

Mengyuan Xiao, Pascal A. Oesch, Longji Bing +30

Little Red Dots (LRDs) are compact, point-like sources characterized by their red color and broad Balmer lines, which have been debated to be either dominated by active galactic nu…