🔭 Category

astro-ph.GA

1942 papers

JWST reveals the diversity of nuclear obscuring dust in nearby AGN: nuclear isolation of MIRI/MRS datacubes and continuum spectral fitting

Using JWST/MIRI observations of 21 nearby AGN, this study demonstrates that while a hybrid clumpy-smooth dust model successfully fits many targets, current theoretical models fail to reproduce 40% of the observed spectra due to unmodeled extreme silicate features and signatures of water-ice and hydrocarbon absorption, highlighting the need for new dust chemistry models.

Omaira González-Martín, Daniel J. Díaz-González, Mariela Martínez-Paredes, Almudena Alonso-Herrero, Enrique López-Rodríguez, Begoña García-Lorenzo, Cristina Ramos Almeida, Ismael García-Bernete, Donaji Esparza-Arredondo, Sebastian F. Hoenig, Santiago García-Burillo, Chris Packham, Nancy A. Levenson, Alvaro Labiano, Miguel Pereira-Santaella, Francoise Combes, Anelise Audibert, Erin K. S. Hicks, Lulu Zhang, Enrica Bellocchi, Richard I. Davies, Laura Hermosa Muñoz, Masatoshi Imanishi, Claudio Ricci, Marko Stalevski2026-04-14🔭 astro-ph

Population III star formation near high-redshift active galactic nuclei

Using cosmological radiation-hydrodynamical simulations, this study demonstrates that accreting supermassive black holes in the early universe can delay gas collapse in nearby halos to enable the formation of massive Population III star clusters or direct-collapse black holes, with predicted HeII 1640 luminosities consistent with recent James Webb Space Telescope observations.

Ethan M. Fisk, Madeline A. Marshall, Phoebe R. Upton Sanderbeck, Jarrett L. Johnson2026-04-14🔭 astro-ph

JWST Spectroscopic Insights Into the Diversity of Galaxies in the First 500 Myr: Short-Lived Snapshots Along a Common Evolutionary Pathway

Using JWST/NIRSpec observations of 41 galaxies at z>10, this study reveals that the spectral diversity of early galaxies is primarily driven by short-lived, bursty star formation cycles, where strong CIV emitters represent brief, intense starburst phases that temporarily outshine their hosts, rather than being caused by active galactic nuclei.

Guido Roberts-Borsani, Pascal Oesch, Richard Ellis, Andrea Weibel, Emma Giovinazzo, Rychard Bouwens, Pratika Dayal, Adriano Fontana, Kasper Heintz, Jorryt Matthee, Romain Meyer, Laura Pentericci, Alice Shapley, Sandro Tacchella, Tommaso Treu, Fabian Walter, Hakim Atek, Sownak Bose, Marco Castellano, Yoshinobu Fudamoto, Takahiro Morishita, Rohan Naidu, Ryan Sanders, Arjen van der Wel2026-04-14🔭 astro-ph

A fast machine learning tool to predict the composition of astronomical ices from infrared absorption spectra

The paper introduces AICE, a fast and accurate artificial neural network tool that predicts the fractional composition of interstellar ices (including H₂O, CO, CO₂, CH₃OH, NH₃, and CH₄) from infrared absorption spectra in under one second, enabling the systematic analysis of hundreds of JWST observations with typical errors of approximately 3%.

Andrés Megías, Izaskun Jiménez-Serra, François Dulieu, Julie Vitorino, Belén Maté, David Ciudad, Will R. M. Rocha, Marcos Martínez Jiménez, Jacobo Aguirre2026-04-14🔭 astro-ph

The Colors of Ices: Measuring ice column density through photometry

This paper demonstrates that JWST photometry, combined with the new open-source tool *icemodels*, can effectively quantify interstellar ice column densities and abundances in the Galactic Center, revealing significant CO ice freeze-out and suggesting a metallicity at least 2.5 times that of the Sun.

Adam Ginsburg, Savannah R. Gramze, Matthew L. N. Ashby, Brandt A. L. Gaches, Nazar Budaiev, Miriam G. Santa-Maria, Alyssa Bulatek, A. T. Barnes, Desmond Jeff, Neal J. Evans II, Cara D. Battersby2026-04-14🔭 astro-ph

Low-noise Fourier Transform Spectroscopy Enabled by Superconducting On-Chip Filterbank Spectrometers

This paper proposes a hybrid spectroscopic architecture that couples a medium-resolution Fourier transform spectrometer with a low-resolution on-chip filterbank spectrometer to significantly reduce photon noise and enable high-sensitivity, large-field line intensity mapping at resolutions of R~1000 for ground-based and balloon-borne astronomy.

Chris S. Benson, Peter S. Barry, Patrick Ashworth, Harry Gordon-Moys, Kirit S. Karkare, Izaak Morris, Gethin Robson2026-04-14🔭 astro-ph

False Alarm Rates in Detecting Gravitational Wave Lensing from Astrophysical Coincidences: Insights with Model-Independent Technique GLANCE

This study employs the model-independent GLANCE pipeline to quantify the false alarm rates of incorrectly identifying unlensed binary black hole mergers as lensed events, revealing that such misclassifications occur in approximately 0.01% of pairs with time delays exceeding 1000 days under current LIGO sensitivities.

Aniruddha Chakraborty, Suvodip Mukherjee2026-04-14⚛️ gr-qc

Effects of Varied Cosmic Ray Feedback from AGN on Massive Galaxy Properties

This study demonstrates that while varied cosmic ray feedback mechanisms from active galactic nuclei successfully quench star formation in massive galaxies to match observed scaling relations, they produce significantly different circumgalactic medium properties, suggesting that multi-wavelength observations of halo gas could constrain the specific physical nature of AGN feedback.

Charvi Goyal, Sam B. Ponnada, Philip F. Hopkins, Sarah Wellons, Jose A. Benavides, Kung-Yi Su2026-04-14🔭 astro-ph

Early thin-disc assembly revealed by JWST edge-on galaxies

By applying a new 3D forward-modelling methodology to JWST imaging of edge-on galaxies at 1<z<31<z<3, this study reveals that thin stellar discs with scale heights consistent with the local Milky Way were already in place by z∼3z\sim3, suggesting that thick discs likely formed later through progressive dynamical heating rather than an early turbulent phase.

Marloes van Asselt, Francesca Rizzo, Luca Di Mascolo2026-04-14🔭 astro-ph

SN 2017ati: A luminous type IIb explosion from a massive progenitor

This paper presents observations of the luminous Type IIb supernova SN 2017ati, revealing that its exceptional brightness and late-time evolution are best explained by a massive progenitor (≥17 M⊙\geq17\,M_{\odot}) whose explosion was powered by a combination of radioactive nickel decay and energy injection from a central magnetar.

Z. -H. Peng, S. Benetti, Y. -Z. Cai, A. Pastorello, J. -W. Zhao, A. Reguitti, Z. -Y. Wang, E. Cappellaro, N. Elias-Rosa, Q. -L. Fang, M. Fraser, T. Kangas, E. Kankare, Z. Kostrzewa-Rutkowska, P. Lundqvist, S. Mattila, T. M. Reynolds, M. D. Stritzinger, A. Somero, L. Tomasella, S. -P. Pei, Y. -J. Yang, J. -J. Zhang, Y. Pan2026-04-14🔭 astro-ph

A first empirical derivation of the average dust attenuation law at 2<z<7

Using JWST spectroscopy and photometry of 120 star-forming galaxies at redshifts 2 < z < 7, this study presents the first empirical derivation of the average dust attenuation law, revealing a smooth, UV-flatter curve consistent with the local starburst relation but lacking a significant 2175Å bump.

Giulia Rodighiero, Gaia Edes Esposito, Daniela Calzetti, Pietro Benotto, Michele Catone, Paolo Cassata, Giovanni Gandolfi, Laura Bisigello, Stefano Carniani, Alvio Renzini, Irene Shivaei, Benedetta Vulcani, Annagrazia Puglisi2026-04-14🔭 astro-ph

Magnetic field alignment with dense cores in the transition between cloud and core scales

Using high-resolution BISTRO survey data, this study finds that magnetic field orientations become increasingly disordered from cloud to core scales, supporting the conclusion that magnetic fields likely do not play a dominant role in the evolution of dense cores.

Sean Yin, Ayush Pandhi, Rachel Friesen, Simon Coudé, Laura Fissel, Sarah Sadavoy, James Di Francesco, Doug Johnstone, Frédérick Poidevin, Mehrnoosh Tahani2026-04-14🔭 astro-ph

Repopulating the pair-instability mass gap without sustained growth to massive IMBHs: the case of 47\,Tuc

By modeling 47 Tuc with both standard stellar-mass black holes and primordial seeds, this study demonstrates that while hierarchical mergers alone cannot produce intermediate-mass black holes due to recoil kicks, the retention of rare massive primordial seeds offers a viable pathway to populate the pair-instability mass gap without forming a single dominant intermediate-mass black hole, a scenario consistent with current dynamical limits and testable via future gravitational-wave observations.

Debatri Chattopadhyay, Daniel Marín Pina, Mark Gieles, Fabio Antonini, Fotios Fronimos Pouliasis2026-04-14🔭 astro-ph

Learning What's Real: Disentangling Signal and Measurement Artifacts in Multi-Sensor Data, with Applications to Astrophysics

This paper proposes a deep learning framework that disentangles intrinsic physical signals from sensor-specific artifacts in multi-instrument data by leveraging overlapping observations and counterfactual generation, thereby enabling unconfounded parameter inference and instrument-independent analysis, as demonstrated on astrophysical galaxy images.

Pablo Mercader-Perez, Carolina Cuesta-Lazaro, Daniel Muthukrishna, Jeroen Audenaert, V. Ashley Villar, David W. Hogg, Marc Huertas-Company, William T. Freeman2026-04-14🔭 astro-ph

Kozai-driven mass loss of the circumbinary disk in D9 in orbit around the supermassive black hole Sgr A*

This study demonstrates that the circumbinary disk around the S-star binary D9 near Sgr A* undergoes periodic mass loss driven by von Zeipel-Lidov-Kozai oscillations, a mechanism that likely explains the absence of similar disks around other S-cluster members by depleting the disk within the cluster's typical lifetime.

Yannick Badoux, Lucas Pouw, Tim van der Vuurst, Simon Portegies Zwart2026-04-14🔭 astro-ph

Galactic Archaeology with the Subaru `\=Onohi`ula Prime Focus Spectrograph Strategic Program

The Subaru Strategic Program for the Prime Focus Spectrograph (PFS) will conduct a comprehensive Galactic Archaeology survey over 130 nights to investigate dark matter density profiles in dwarf galaxies, compare the assembly histories of the Milky Way and M31, and trace the Milky Way's accretion history by obtaining spectra for approximately 68,000 stars across the Local Group.

Masashi Chiba, Rosemary F. G. Wyse, Evan N. Kirby, Judith G. Cohen, László Dobos, Roman Gerasimov, Miho N. Ishigaki, Kohei Hayashi, Carrie Filion, Magda Arnaboldi, Souradeep Bhattacharya, Yutaka Hirai, Chiaki Kobayashi, Yutaka Komiyama, Pete B. Kuzma, Itsuki Ogami, Ana L. Chies-Santos, Nicole L. Klock-Miranda, Federico Sestito, Tamás Budavári, Andrew P. Cooper, Keyi Ding, Ivanna Escala, Elisa G. M. Ferreira, Ortwin Gerhard, Lauren Henderson, Jihye Hong, Shunichi Horigome, Ryota Ikeda, Ryo Ishikawa, Takanobu Kirihara, Zhuohan Li, Nicolas Martin, Rin Miyazaki Sakurako Okamoto, Rohan Pattnaik, Kyosuke Sato, Yoshihisa Suzuki, Alexander S. Szalay, Dafa Wardana, Viska Wei, Wenbo Wu, Zhenyu Wu, Xinfeng Xu, Xianhao Ye, Yohei Miki, Xiangwei Zhang, Gang Zhao, Jingkun Zhao, Xiaosheng Zhao2026-04-14🔭 astro-ph

Spectroscopic Survey of Faint Planetary-Nebula Nuclei. VIII. The Dwarf Barium Central Star of Kohoutek 1-9

This paper reports the discovery that the central star of planetary nebula Kohoutek 1-9 is a rare dwarf barium star, providing evidence for a wide binary progenitor system where mass transfer enriched the companion with s-process elements and shaped the nebula into a thin ring.

Howard E. Bond (Penn State, STScI), Peter Goodhew (Deep Space Imaging Network), Daniel Stern (MEA Observatory), Jonathan Talbot (Stark Bayou Observatory), Gregory R. Zeimann (Hobby-Eberly Telescope)2026-04-14🔭 astro-ph