CHILES. IX. Observational and Simulated H <scp>i</scp> Content and Star Formation of Blue Galaxies in Different Cosmic Web Environments
Abstract We examine the redshift evolution of the relationship between the neutral atomic hydrogen (H i ) content and star formation properties of blue galaxies, along with their location in the cosmic web. Using the COSMOS H i Large Extragalactic Survey (CHILES) and the IllustrisTNG (TNG100) cosmological simulation, and the DisPerSE algorithm, we identify the filamentary structure in both observations and simulations, measure the distance of galaxies to the nearest filament spine D fil , and calculate the mean H i gas fraction and the relative specific star formation rate (sSFR) of blue galaxies in three different cosmic web environments—0 < D fil /Mpc < 2 (filament cores), 2 < D fil /Mpc < 4 (filament outskirts), and 4 < D fil /Mpc < 20 (voids). We find that, although there are some similarities between CHILES and TNG, there exist significant discrepancies in the dependence of H i and star formation on the cosmic web and on redshift. TNG overpredicts the observed H i fraction and relative sSFR at z = 0–0.5, with the tension being strongest in the voids. CHILES observes a decline in the H i fraction from filament cores to voids, exactly the opposite of the trend predicted by TNG. CHILES observes an increase in H i fraction at z = 0.5 → 0 in the voids, while TNG predicts an increase in this time in all environments. Further dividing the sample into stellar mass bins, we find that the H i in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>*</mml:mo> </mml:mrow> </mml:msub> <mml:mo>/</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⊙</mml:mo> </mml:mrow> </mml:msub> <mml:mo stretchy="false">)</mml:mo> <mml:mo>></mml:mo> <mml:mn>10</mml:mn> </mml:math> galaxies is better reproduced by TNG than H i in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>*</mml:mo> </mml:mrow> </mml:msub> <mml:mo>/</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>⊙</mml:mo> </mml:mrow> </mml:msub> <mml:mo stretchy="false">)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>9</mml:mn> <mml:mo>−</mml:mo> <mml:mn>10</mml:mn> </mml:math> galaxies.
Authors
- Farhanul Hasan (ORCID: https://orcid.org/0000-0002-0072-0281)
- Nicholas Luber
- Sushma Kurapati (ORCID: https://orcid.org/0000-0001-6615-5492)
- Kelley M. Hess (ORCID: https://orcid.org/0000-0001-9662-9089)
- Daisuke Nagai (ORCID: https://orcid.org/0000-0002-6766-5942)
- Lucas Hunt (ORCID: https://orcid.org/0000-0001-8587-9285)
- Min S. Yun (ORCID: https://orcid.org/0000-0001-7095-7543)
- D. J. Pisano (ORCID: https://orcid.org/0000-0001-7996-7860)
- Joel R. Primack (ORCID: https://orcid.org/0000-0001-5091-5098)
- J. H. van Gorkom (ORCID: https://orcid.org/0000-0002-7679-9344)
- Joseph N. Burchett (ORCID: https://orcid.org/0000-0002-1979-2197)
- Hansung B. Gim (ORCID: https://orcid.org/0000-0003-1436-7658)
- D. M. Lucero (ORCID: https://orcid.org/0000-0002-8799-3054)
- Nir Mandelker (ORCID: https://orcid.org/0000-0001-8057-5880)
- David C. Koo (ORCID: https://orcid.org/0000-0003-3385-6799)
- M. Meyer (ORCID: https://orcid.org/0000-0002-2838-3010)
- Emmanuel Momjian (ORCID: https://orcid.org/0000-0003-3168-5922)
- Julia Blue Bird (ORCID: https://orcid.org/0000-0002-9627-7519)
Institutions
- New Mexico State University (US)
- Space Telescope Science Institute (US)
- University of Cape Town (ZA)
- The University of Western Australia (AU)
- University of California, Santa Cruz (US)
- Montana State University (US)
- University of Massachusetts Amherst (US)
- National Radio Astronomy Observatory (US)
- Yale University (US)
- Université Bourgogne Franche-Comté (FR)
- International Centre for Radio Astronomy Research (AU)
- Chalmers University of Technology (SE)
- Columbia University (US)
- Virginia Tech (US)
- Netherlands Institute for Radio Astronomy (NL)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2025-05-27
- DOI
- https://doi.org/10.3847/1538-4357/adc448
- Citations
- 4
- Primary Topic
- Galaxies: Formation, Evolution, Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 4.62
Funders
- United States - Israel Binational Science Foundation
- Israel Science Foundation