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K. Decker

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Articles by K. Decker

Astrophysics > Astrophysics of Galaxies

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By K. Decker
| arXiv
Active galactic nuclei (AGN) vary on broad timescales, but are primarily thought to "flicker" on and off during episodes of high and low accretion. Supermassive black holes (SMBHs) which are actively accreting material often show optical spectra dominated by AGN emission in their nuclei and beyond. In this work we develop an empirical model to quantify the fractional AGN contribution to optical spectra using the Baldwin-Phillips-Terlevich (BPT) emission line diagnostic diagram.
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Astrophysics > Instrumentation and Methods for Astrophysics

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By Belén Miranda Alcalde, de Graaff, K. Decker
| arXiv
The discovery of massive quiescent galaxies at high redshift by JWST has revealed that star formation can cease rapidly in the early Universe, yet the physical mechanisms responsible for quenching remain unknown. A key missing element is the systematic measurement in statistically representative quiescent samples of the cold gas and dust content, which are crucial for distinguishing quenching mechanisms and evolutionary pathways.
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Astrophysics > Astrophysics of Galaxies

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By K. Decker
| arXiv
Post-starburst galaxies are galaxies which have recently and rapidly shut off star formation. AGN activity is often invoked to explain this rapid quenching, but most post-starburst selection methods select against optical AGN, motivating searches for "post-starburst quasars." We present DESI observations of ten post-starburst quasars with significant MgII emission ($L_{\text{MgII}} \geq 3 \times 10^{41}$ erg/s).
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Astrophysics > Instrumentation and Methods for Astrophysics

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By K. Decker
| arXiv
[Submitted on 21 Jul 2026 ( v1 ), last revised 19 Oct 2026 (this version, v3)] Title:NAPTIME: A Neural-Process Framework for Rubin Alert Classification View a PDF of the paper titled NAPTIME: A Neural-Process Framework for Rubin Alert Classification, by Nicholas Earl and 5 other authors View PDF HTML (experimental) Abstract:The Vera C.
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Astrophysics > High Energy Astrophysical Phenomena

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By K. Decker
| arXiv
[Submitted on 11 Dec 2025 ( v1 ), last revised 27 Oct 2026 (this version, v3)] Title:FEADME: Fast Elliptical Accretion Disk Modeling Engine View a PDF of the paper titled FEADME: Fast Elliptical Accretion Disk Modeling Engine, by Nicholas Earl and 7 other authors View PDF HTML (experimental) Abstract:We present FEADME (Fast Elliptical Accretion Disk Modeling Engine), a GPU-accelerated Python framework for modeling broad Balmer-line emission with a relativistic elliptical accretion-disk...
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[2512.09889] Clumpy, dense gas in the outflow of NGC 1266

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By K. Decker, Justin Atsushi
| arXiv
[Submitted on 10 Dec 2025 (v1), last revised 11 Dec 2025 (this version, v2)] View PDF HTML (experimental) Comments: Subjects: Astrophysics of Galaxies (astro-ph.GA) Cite as: arXiv:2512.09889 [astro-ph.GA] (or arXiv:2512.09889v2 [astro-ph.GA] for this version) https://doi.org/10.48550/arXiv.2512.09889
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[2012.10195] Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg

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By K. Decker
| arXiv
Please join the Simons Foundation and our generous member organizations in supporting arXiv during our giving campaign September 23-27. 100% of your contribution will fund improvements and new initiatives to benefit arXiv's global scientific community.
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[1904.09293] Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS

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By K. Decker, Jack M. M
| arXiv
Authors:Thomas W.-S. Holoien, Patrick J. Vallely, Katie Auchettl, K. Z. Stanek, Christopher S. Kochanek, K. Decker French, Jose L. Prieto, Benjamin J. Shappee, Jonathan S. Brown, Michael M. Fausnaugh, Subo Dong, Todd A. Thompson, Jack M. M. Neustadt, P. Cacella, J. Brimacombe, Rachael L. Beaton, Konstantina Boutsia, Laura Chomiuk, Thomas Connor, Nidia Morrell, Andrew B. Newman, Gwen C.
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