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Intensity mapping experiments are beginning to measure the spatial distribution of neutral atomic hydrogen (HI) to constrain cosmological parameters and the large-scale distribution of matter. However, models of the behaviour of HI as a…

Astrophysics of Galaxies · Physics 2024-04-30 Calvin Osinga , Benedikt Diemer , Francisco Villaescusa-Navarro , Elena D'Onghia , Peter Timbie

The scatter in global atomic hydrogen (HI) scaling relations is partly attributed to differences in how HI and stellar properties are measured, with HI reservoirs typically extending beyond the inner regions of galaxies where star formation…

The empirical studies of cold gas content serve as an essential aspect in comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various…

The assembly and build-up of neutral atomic hydrogen (HI) in galaxies is one of the most fundamental processes in galaxy formation and evolution. Studying this process directly in the early universe is hindered by the weakness of the…

We combine the latest observationally motivated constraints on stellar properties in dark matter haloes, along with data-driven predictions for the atomic (HI) and molecular (H$_2$) gas evolution in galaxies, to derive empirical…

Astrophysics of Galaxies · Physics 2020-06-10 Hamsa Padmanabhan , Abraham Loeb

We study the evolution of the cold gas content of galaxies by splitting the interstellar medium into its atomic and molecular hydrogen components, using the galaxy formation model GALFORM in the LCDM framework. We calculate the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 Claudia del P. Lagos , Carlton M. Baugh , Cedric G. Lacey , Andrew J. Benson , Han-Seek Kim , Chris Power

The neutral atomic gas content of individual galaxies at large cosmological distances has until recently been difficult to measure due to the weakness of the hyperfine HI 21-cm transition. Here we estimate the HI gas mass of a sample of…

We apply novel survival analysis techniques to investigate the relationship between a number of the properties of galaxies and their atomic ($M_\mathrm{HI}$) and molecular ($M_{\mathrm{H_2}}$) gas mass, with the aim of devising efficient,…

Astrophysics of Galaxies · Physics 2019-11-06 Hassen M. Yesuf , Luis C. Ho

Scaling relations of metallicity (O/H), star formation rate (SFR), and stellar mass give important insight on galaxy evolution. They are obeyed by most galaxies in the Local Universe and also at high redshift. In a companion paper, we…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 Laura Magrini , Leslie Hunt , Daniele Galli , Raffaella Schneider , Simone Bianchi , Roberto Maiolino , Donatella Romano , Monica Tosi , Rosa Valiante

The stellar and neutral hydrogen (HI) mass functions at z~0 are fundamental benchmarks for current models of galaxy evolution. A natural extension of these benchmarks is the two-dimensional distribution of galaxies in the plane spanned by…

Astrophysics of Galaxies · Physics 2015-06-23 Natasha Maddox , Kelley M. Hess , Danail Obreschkow , M. J. Jarvis , S. -L. Blyth

Atomic hydrogen (HI) plays a fundamental role in fueling star formation in galaxies. However, the behavior of HI gas in interacting systems, particularly galaxy pairs, remains elusive. In this work, we investigate the HI content of major…

Astrophysics of Galaxies · Physics 2026-05-07 Shulan Yan , Qingzheng Yu , Taotao Fang , Chuan He , Andrew Ma , Junfeng Wang , C. Kevin Xu , Ming Zhu , Weishan Zhu

We study the connection of star formation to atomic (HI) and molecular hydrogen (H$_2$) in isolated, low metallicity dwarf galaxies with high-resolution ($m_{\rm gas}$ = 4 M$_\odot$, $N_{\rm ngb}$ = 100) SPH simulations. The model includes…

Astrophysics of Galaxies · Physics 2016-03-23 Chia-Yu Hu , Thorsten Naab , Stefanie Walch , Simon C. O. Glover , Paul C. Clark

We present the first estimate, based on direct HI 21 cm observations, of the HI mass function (HIMF) of star-forming galaxies at $z\approx1$, obtained by combining our measurement of the scaling relation between HI mass ($M_{HI}$) and…

Astrophysics of Galaxies · Physics 2024-05-07 Aditya Chowdhury , Nissim Kanekar , Jayaram N. Chengalur

(Abridged) Accurately predicting how the cosmic abundance of neutral hydrogen evolves with redshift is a challenging problem facing modellers of galaxy formation. We investigate the predictions of four currently favoured semi-analytical…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 C. Power , C. M. Baugh , C. G. Lacey

We present the global scaling relations between the neutral atomic hydrogen gas, the stellar disk and the star forming disk in a sample of 228 nearby galaxies that are both spatially and spectrally resolved in HI line emission. We have used…

Astrophysics of Galaxies · Physics 2021-01-14 Elizabeth Naluminsa , Edward C. Elson , Thomas H. Jarrett

Environments play an important role in galaxy formation and evolution, particularly in regulating the content of neutral gas. However, current HI surveys have limitations in their depth, which prevents them from adequately studying low HI…

Astrophysics of Galaxies · Physics 2023-09-13 Hui-Jie Hu , Qi Guo , Pablo Renard , Hang Yang , Zheng Zheng , Yingjie Jing , Hao Chen , Hui Li

We apply a spectral stacking technique to Westerbork Synthesis Radio Telescope observations to measure the neutral atomic hydrogen content (HI) of nearby galaxies in and around galaxy groups at $z < 0.11$. Our sample includes 577…

We combine molecular gas masses inferred from CO emission in 500 star forming galaxies (SFGs) between z=0 and 3, from the IRAM-COLDGASS, PHIBSS1/2 and other surveys, with gas masses derived from Herschel far-IR dust measurements in 512…

Assessments of the cold-gas reservoir in galaxies are a cornerstone for understanding star-formation processes and the role of feedback and baryonic cycling in galaxy evolution. Here we exploit a sample of 392 galaxies (dubbed MAGMA,…

Astrophysics of Galaxies · Physics 2020-11-25 L. K. Hunt , C. Tortora , M. Ginolfi , R. Schneider

Using a spectral stacking technique, we measure the neutral hydrogen (HI) properties of a sample of galaxies at $z < 0.11$ across 35 pointings of the Westerbork Synthesis Radio Telescope (WSRT). The radio data contains 1,895 galaxies with…