Dr Daniel Farrow's Outputs (19)

One-class support vector machines for detecting population drift in deployed machine learning medical diagnostics (2025)
Journal Article
Jones, W. S., & Farrow, D. J. (2025). One-class support vector machines for detecting population drift in deployed machine learning medical diagnostics. Scientific reports, 15(1), Article 12157. https://doi.org/10.1038/s41598-025-94427-x

Machine learning (ML) models are increasingly being applied to diagnose and predict disease, but face technical challenges such as population drift, where the training and real-world deployed data distributions differ. This phenomenon can degrade mod... Read More about One-class support vector machines for detecting population drift in deployed machine learning medical diagnostics.

Using Lyα Absorption to Measure the Intensity and Variability of z ∼ 2.4 Ultraviolet Background Light (2025)
Journal Article
Weiss, L. H., Gebhardt, K., Davis, D., Mentuch Cooper, E., Lujan Niemeyer, M., Qezlou, M., Mirza Khanlari, M., Ciardullo, R., Farrow, D., Gawiser, E., Gazagnes, S., Gronwall, C., Hill, G. J., & Schneider, D. P. (2025). Using Lyα Absorption to Measure the Intensity and Variability of z ∼ 2.4 Ultraviolet Background Light. The Astrophysical journal, 983(1), Article 72. https://doi.org/10.3847/1538-4357/adc0f9

We present measurements of z ∼ 2.4 ultraviolet (UV) background light using Lyα absorption from galaxies at z ∼ 2–3 in the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) database. Thanks to the wide area of this survey, we also measure the var... Read More about Using Lyα Absorption to Measure the Intensity and Variability of z ∼ 2.4 Ultraviolet Background Light.

The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release (2025)
Journal Article
Liu, C., Gebhardt, K., Mentuch Cooper, E., Davis, D., Schneider, D. P., Jarvis, M. J., Farrow, D. J., Finkelstein, S. L., Chávez Ortiz, Ó. A., & The HETDEX Collaboration. (2025). The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release. Astrophysical Journal Supplement, 276(2), Article 72. https://doi.org/10.3847/1538-4365/ada4a5

We present the active galactic nuclei (AGN) catalog from the fourth data release (HDR4) of the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey. HDR4 contains 345,874 Integral Field Unit obse... Read More about The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release.

The Lyα Dependence on Nebular Properties from the HETDEX and MOSDEF Surveys (2024)
Journal Article
Chávez Ortiz, Ó. A., Leung, G. C. K., Finkelstein, S. L., Davis, D., Sutherland, R. S., Nicholls, D. C., Stephenson, M., Mentuch Cooper, E., Bagley, M., Gebhardt, K., House, L. R., Liu, C., Ciardullo, R., Gronwall, C., Hill, G. J., Farrow, D., & Schneider, D. P. (2024). The Lyα Dependence on Nebular Properties from the HETDEX and MOSDEF Surveys. The Astrophysical journal, 977(1), Article 107. https://doi.org/10.3847/1538-4357/ad7a00

Investigating the impact of galaxy properties on emergent Lyα emission is crucial for reionization studies, given the sensitivity of Lyα to neutral hydrogen. This study presents an analysis of the physical characteristics of 155 star-forming galaxies... Read More about The Lyα Dependence on Nebular Properties from the HETDEX and MOSDEF Surveys.

Participatory Science and Machine Learning Applied to Millions of Sources in the Hobby-Eberly Telescope Dark Energy Experiment (2024)
Journal Article
House, L. R., Gebhardt, K., Finkelstein, K., Mentuch Cooper, E., Davis, D., Farrow, D., & Schneider, D. P. (2024). Participatory Science and Machine Learning Applied to Millions of Sources in the Hobby-Eberly Telescope Dark Energy Experiment. The Astrophysical journal, 975(2), Article 172. https://doi.org/10.3847/1538-4357/ad782c

We are merging a large participatory science effort with machine learning to enhance the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). Our overall goal is to remove false positives, allowing us to use lower signal-to-noise data and sources... Read More about Participatory Science and Machine Learning Applied to Millions of Sources in the Hobby-Eberly Telescope Dark Energy Experiment.

Do galaxy mergers prefer under-dense environments? (2024)
Journal Article
Sureshkumar, U., Durkalec, A., Pollo, A., Pearson, W., Farrow, D., Narayanan, A., Loveday, J., Taylor, E., & Suelves, L. (2024). Do galaxy mergers prefer under-dense environments?. Astronomy and Astrophysics, 686, Article A40. https://doi.org/10.1051/0004-6361/202347705

Context. Galaxy mergers play a crucial role in galaxy evolution. However, the correlation between mergers and the local environment of galaxies is not fully understood.
Aims. We aim to address the question of whether galaxy mergers prefer denser or... Read More about Do galaxy mergers prefer under-dense environments?.

Absorption Troughs of Lyα Emitters in HETDEX (2024)
Journal Article
Weiss, L. H., Davis, D., Gebhardt, K., Gazagnes, S., Mirza Khanlari, M., Mentuch Cooper, E., Chisholm, J., Berg, D., Bowman, W. P., Byrohl, C., Ciardullo, R., Fabricius, M., Farrow, D., Gronwall, C., Hill, G. J., House, L. R., Jeong, D., Khoraminezhad, H., Kollatschny, W., Komatsu, E., …Zeimann, G. R. (2024). Absorption Troughs of Lyα Emitters in HETDEX. The Astrophysical journal, 962(2), Article 102. https://doi.org/10.3847/1538-4357/ad1b51

The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is designed to detect and measure the redshifts of more than 1 million Lyα emitting galaxies (LAEs) 1.88 < z < 3.52. In addition to its cosmological measurements, these data enable studies of... Read More about Absorption Troughs of Lyα Emitters in HETDEX.

The Preexplosion Environments and the Progenitor of SN 2023ixf from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) (2023)
Journal Article
Liu, C., Chen, X., Er, X., Zeimann, G. R., Vinkó, J., Wheeler, J. C., Cooper, E. M., Davis, D., Farrow, D. J., Gebhardt, K., Guo, H., Hill, G. J., House, L., Kollatschny, W., Kong, F., Kumar, B., Liu, X., Tuttle, S., Endl, M., Duke, P., …Liu, X. (2023). The Preexplosion Environments and the Progenitor of SN 2023ixf from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). Astrophysical journal. Letters, 958(2), Article L37. https://doi.org/10.3847/2041-8213/ad0da8

Supernova (SN) 2023ixf was discovered on 2023 May 19. The host galaxy, M101, was observed by the Hobby-Eberly Telescope Dark Energy Experiment collaboration over the period 2020 April 30-2020 July 10, using the Visible Integral-field Replicable Unit... Read More about The Preexplosion Environments and the Progenitor of SN 2023ixf from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX).

HETDEX Public Source Catalog 1—Stacking 50,000 Lyman Alpha Emitters ∗ (2023)
Journal Article
Davis, D., Gebhardt, K., Cooper, E. M., Bowman, W. P., Garcia Castanheira, B., Chisholm, J., Ciardullo, R., Fabricius, M., Farrow, D. J., Finkelstein, S. L., Gronwall, C., Gawiser, E., Hill, G. J., Hopp, U., House, L. R., Jeong, D., Kollatschny, W., Komatsu, E., Liu, C., Niemeyer, M. L., …Zeimann, G. (2023). HETDEX Public Source Catalog 1—Stacking 50,000 Lyman Alpha Emitters ∗. The Astrophysical journal, 954(2), Article 209. https://doi.org/10.3847/1538-4357/ace4c2

We describe the ensemble properties of the 1.9 < z < 3.5 Lyman alpha emitters (LAEs) found in the HETDEX survey's first public data release, HETDEX Public Source Catalog 1. Stacking the low-resolution (R ∼ 800) spectra greatly increases the signal-to... Read More about HETDEX Public Source Catalog 1—Stacking 50,000 Lyman Alpha Emitters ∗.

Cosmological-scale Lyα Forest Absorption around Galaxies and AGNs Probed with the HETDEX and SDSS Spectroscopic Data (2023)
Journal Article
Sun, D., Mawatari, K., Ouchi, M., Ono, Y., Yajima, H., Zhang, Y., Abe, M., Bowman, W. P., Cooper, E. M., Davis, D., Farrow, D. J., Gebhardt, K., Hill, G. J., Liu, C., & Schneider, D. P. (2023). Cosmological-scale Lyα Forest Absorption around Galaxies and AGNs Probed with the HETDEX and SDSS Spectroscopic Data. The Astrophysical journal, 951(1), Article 25. https://doi.org/10.3847/1538-4357/accf88

We present cosmological-scale three-dimensional neutral hydrogen (H i) tomographic maps at z = 2-3 over a total of 837 deg2 in two blank fields that are developed with Lyα forest absorptions of 14,736 background Sloan Digital Sky Survey (SDSS) quasar... Read More about Cosmological-scale Lyα Forest Absorption around Galaxies and AGNs Probed with the HETDEX and SDSS Spectroscopic Data.

Using Dark Energy Explorers and Machine Learning to Enhance the Hobby-Eberly Telescope Dark Energy Experiment (2023)
Journal Article
House, L. R., Gebhardt, K., Finkelstein, K., Cooper, E. M., Davis, D., Ciardullo, R., Farrow, D. J., Finkelstein, S. L., Gronwall, C., Jeong, D., Johnson, L. C., Liu, C., Thomas, B. P., & Zeimann, G. (2023). Using Dark Energy Explorers and Machine Learning to Enhance the Hobby-Eberly Telescope Dark Energy Experiment. The Astrophysical journal, 950(2), Article 82. https://doi.org/10.3847/1538-4357/accdd0

We present analysis using a citizen science campaign to improve the cosmological measures from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is to measure the Hubble expansion rate, H(z), and angular diameter distance... Read More about Using Dark Energy Explorers and Machine Learning to Enhance the Hobby-Eberly Telescope Dark Energy Experiment.

The Stellar Mass-Black Hole Mass Relation at z ∼ 2 down to MBH ∼ 10⁷ M⊙ Determined by HETDEX (2023)
Journal Article
Zhang, Y., Ouchi, M., Gebhardt, K., Liu, C., Harikane, Y., Cooper, E. M., Davis, D., Farrow, D. J., Gawiser, E., Hill, G. J., Kollatschny, W., Ono, Y., Schneider, D. P., Finkelstein, S. L., Gronwall, C., Jogee, S., & Krumpe, M. (2023). The Stellar Mass-Black Hole Mass Relation at z ∼ 2 down to MBH ∼ 10⁷ M⊙ Determined by HETDEX. The Astrophysical journal, 948(2), Article 103. https://doi.org/10.3847/1538-4357/acc2c2

We investigate the stellar mass-black hole mass ( M * - M BH ) relation with type 1 active galactic nuclei (AGNs) down to M BH = 10 7 M ⊙ , corresponding to a ≃ −21 absolute magnitude in rest-frame ultraviolet, at z = 2-2.5. Exploiting the deep and l... Read More about The Stellar Mass-Black Hole Mass Relation at z ∼ 2 down to MBH ∼ 10⁷ M⊙ Determined by HETDEX.

The HETDEX Survey Emission-line Exploration and Source Classification* (2023)
Journal Article
Davis, D., Gebhardt, K., Cooper, E. M., Ciardullo, R., Fabricius, M., Farrow, D. J., Feldmeier, J. J., Finkelstein, S. L., Gawiser, E., Gronwall, C., Hill, G. J., Hopp, U., House, L. R., Jeong, D., Kollatschny, W., Komatsu, E., Landriau, M., Liu, C., Saito, S., Tuttle, S., …Zhang, Y. (2023). The HETDEX Survey Emission-line Exploration and Source Classification*. The Astrophysical journal, 946(2), Article 86. https://doi.org/10.3847/1538-4357/acb0ca

The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the universe at z ∼ 2.4 to 1% precision for both H(z) and DA(z). HETDEX is in the process of mapping in excess... Read More about The HETDEX Survey Emission-line Exploration and Source Classification*.

Searching for Supernovae in HETDEX Data Release 3 (2023)
Journal Article
Vinkó, J., Thomas, B. P., Wheeler, J. C., Ho, A. Y., Cooper, E. M., Gebhardt, K., Ciardullo, R., Farrow, D. J., Hill, G. J., Jäger, Z., Kollatschny, W., Liu, C., Regős, E., & Sárneczky, K. (2023). Searching for Supernovae in HETDEX Data Release 3. The Astrophysical journal, 946(1), Article 31. https://doi.org/10.3847/1538-4357/acbfa8

We have extracted 636 spectra taken at the positions of 583 transient sources from the third data release of the Hobby-Eberly Telescope Dark Energy eXperiment (HETDEX). The transients were discovered by the Zwicky Transient Facility (ZTF) during 2018... Read More about Searching for Supernovae in HETDEX Data Release 3.

Identifying Active Galactic Nuclei at z ∼ 3 from the HETDEX Survey Using Machine Learning (2023)
Journal Article
Tardugno Poleo, V., Finkelstein, S. L., Leung, G., Mentuch Cooper, E., Gebhardt, K., Farrow, D. J., Gawiser, E., Zeimann, G., Schneider, D. P., Morabito, L., Mock, D., & Liu, C. (2023). Identifying Active Galactic Nuclei at z ∼ 3 from the HETDEX Survey Using Machine Learning. Astronomical Journal, 165(4), Article 153. https://doi.org/10.3847/1538-3881/acba92

We used data from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) to study the incidence of AGN in continuum-selected galaxies at z ∼ 3. From optical and infrared imaging in the 24 deg2 Spitzer HETDEX Exploratory Large Area survey, we cons... Read More about Identifying Active Galactic Nuclei at z ∼ 3 from the HETDEX Survey Using Machine Learning.

HETDEX Public Source Catalog 1: 220 K Sources Including Over 50 K Lyα Emitters from an Untargeted Wide-area Spectroscopic Survey (2023)
Journal Article
Mentuch Cooper, E., Gebhardt, K., Davis, D., Farrow, D. J., Liu, C., Zeimann, G., Ciardullo, R., Feldmeier, J. J., Drory, N., Jeong, D., Benda, B., Bowman, W. P., Boylan-Kolchin, M., Chávez Ortiz, Ó. A., Debski, M. H., Dentler, M., Fabricius, M., Farooq, R., Finkelstein, S. L., Gawiser, E., …Zhang, Y. (2023). HETDEX Public Source Catalog 1: 220 K Sources Including Over 50 K Lyα Emitters from an Untargeted Wide-area Spectroscopic Survey. The Astrophysical journal, 943(2), Article 177. https://doi.org/10.3847/1538-4357/aca962

We present the first publicly released catalog of sources obtained from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral field spectroscopic survey designed to measure the Hubble expansion parameter and angular diamet... Read More about HETDEX Public Source Catalog 1: 220 K Sources Including Over 50 K Lyα Emitters from an Untargeted Wide-area Spectroscopic Survey.

Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions (2022)
Journal Article
Driver, S. P., Bellstedt, S., Robotham, A. S. G., Baldry, I. K., Davies, L. J., Liske, J., Obreschkow, D., Taylor, E. N., Wright, A. H., Alpaslan, M., Bamford, S. P., Bauer, A. E., Bland-Hawthorn, J., Bilicki, M., Bravo, M., Brough, S., Casura, S., Cluver, M. E., Colless, M., Conselice, C. J., …Wilkins, S. M. (2022). Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions. Monthly notices of the Royal Astronomical Society, 513(1), 439-467. https://doi.org/10.1093/mnras/stac472

In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248 682 galaxy spectra, and, in combination with earlier surveys, results in 330 542 redshifts across five sky regions cove... Read More about Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions.

The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections (2021)
Journal Article
Gebhardt, K., Mentuch Cooper, E., Ciardullo, R., Acquaviva, V., Bender, R., Bowman, W. P., Castanheira, B. G., Dalton, G., Davis, D., de Jong, R. S., DePoy, D. L., Devarakonda, Y., Dongsheng, S., Drory, N., Fabricius, M., Farrow, D. J., Feldmeier, J., Finkelstein, S. L., Froning, C. S., Gawiser, E., …Zhang, Y. (2021). The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections. The Astrophysical journal, 923(2), Article 217. https://doi.org/10.3847/1538-4357/ac2e03

We describe the survey design, calibration, commissioning, and emission-line detection algorithms for the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is to measure the redshifts of over a million Lyα emitting galaxies b... Read More about The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections.

Correcting correlation functions for redshift-dependent interloper contamination (2021)
Journal Article
Farrow, D. J., Sánchez, A. G., Ciardullo, R., Cooper, E. M., Davis, D., Fabricius, M., Gawiser, E., Grasshorn Gebhardt, H. S., Gebhardt, K., Hill, G. J., Jeong, D., Komatsu, E., Landriau, M., Liu, C., Saito, S., Snigula, J., & Wold, I. G. (2021). Correcting correlation functions for redshift-dependent interloper contamination. Monthly notices of the Royal Astronomical Society, 507(3), 3187-3206. https://doi.org/10.1093/mnras/stab1986

The construction of catalogues of a particular type of galaxy can be complicated by interlopers contaminating the sample. In spectroscopic galaxy surveys this can be due to the misclassification of an emission line; for example in the Hobby-Eberly Te... Read More about Correcting correlation functions for redshift-dependent interloper contamination.