The spatial distribution of neutral hydrogen as traced by low H i mass galaxies

Kim, Han-Seek; Wyithe, J. Stuart B.; Baugh, C. M.; Lagos, Claudia del P.; Power, Chris; Park, Jaehong

doi:10.1093/mnras/stw2779

Cited by 30 publications

(32 citation statements)

References 73 publications

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“…This behavior (i.e central galaxies being more important at medium at high masses and satellites at small masses) is quite general and found also in other models (e.g. GALFORM, Kim et al 2017). Figure 2 shows the contribution to the HI mass function of galaxies hosted by haloes of different mass at z = 0.…”

Section: The Hi Mass Functionsupporting

confidence: 81%

The atomic hydrogen content of the post-reionization Universe

Spinelli

Zoldan

Lucia

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present a comprehensive analysis of atomic hydrogen (HI) properties using a semianalytical model of galaxy formation and N-body simulations covering a large cosmological volume at high resolution. We examine the HI mass function and the HI density, characterizing both their redshift evolution and their dependence on hosting halo mass. We analyze the HI content of dark matter haloes in the local Universe and up to redshift z = 5, discussing the contribution of different galaxy properties. We find that different assembly history plays a crucial role in the scatter of this relation. We propose new fitting functions useful for constructing mock HI maps with HOD techniques. We investigate the HI clustering properties relevant for future 21 cm Intensity Mapping (IM) experiments, including the HI bias and the shot noise level. The HI bias increases with redshift and it is roughly flat on the largest scales probed. The scale dependency is found at progressively larger scales with increasing redshift, apart from a dip feature at z = 0. The shot-noise values are consistent with the ones inferred by independent studies, confirming that shot-noise will not be a limiting factor for IM experiments. We detail the contribution from various galaxy properties on the HI power spectrum and their relation to the halo bias. We find that HI poor satellite galaxies play an important role at the scales of the 1-halo term. Finally, we present the 21 cm signal in redshift space, a fundamental prediction to be tested against data from future radio telescopes such as SKA.

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Section: The Hi Mass Functionsupporting

confidence: 81%

The atomic hydrogen content of the post-reionization Universe

Spinelli

Zoldan

Lucia

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…It is then very likely that the MHI − Mstar relation will not asymptote to a constant as indicated in Catinella, et al (2013) but rather decrease with increasing stellar mass. This is suggested in the results of Kim, et al (2017).…”

Section: Discussionmentioning

confidence: 61%

“…It would be interesting to see if simulations (Davé, et al 2017), SAMs (Kim, et al 2017) and HOD models are able to reproduce our results which provide additional constraints on the population of HI selected galaxies. In section 4 we argued that the effect of dust and inclination are responsible for the bright red population dominating the total HIMF at large masses.…”

Section: Discussionmentioning

confidence: 80%

“…In practice, these relations are used as parameters in theoretical models of galaxy formation when studied in cosmological volumes, since the physics on small, subparsec scales is never resolved (Springel & Hernquist 2003;Di Matteo, Springel & Hernquist 2005). A multipronged approach is used to study the distribution of HI in the post reionization Universe; these include cosmological hydrodynamical simulations of galaxy formation (Davé, et al 2017), semi-analytical models (SAM) of galaxy formation (Kim, et al 2017) and halo-occupation distribution (HOD) (Paul, Choudhury & Paranjape 2018). All of these approaches invoke in some form or other some of the observed scaling relations and model predictions are tested against observations which were not used as their input.…”

Section: Introductionmentioning

confidence: 99%

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The population of galaxies that contribute to the H i mass function

Dutta

Khandai

Dey

2020

Monthly Notices of the Royal Astronomical Society

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We look at the contribution of different galaxy populations to the atomic hydrogen (HI) mass function (HIMF) and the HI density parameter, Ω HI , in the local Universe. Our analysis is based on a sample of 7857 HI-selected galaxies selected from a volume common to the SDSS and ALFALFA surveys (40% catalogα.40). We define different populations of galaxies in the color(u-r )-magnitude(M r ) plane and compute the HIMF for each of them. Additionally we compute the HIMF for dark galaxies; these are undetected in SDSS and represent ∼ 2% of the total sample. We find that the bright red population dominates the total HIMF for log 10 (M HI h 2 70 /M ) ≥ 10.4. The full red population -bright and faint -represents about ∼ 17% of the Ω HI budget, while that of the dark population is ∼ 3%. The HIMF about the knee, log 10 (M HI h 2 70 /M ) ∈ [8, 10.4], is dominated by the faint and bright blue populations, the latter dominating at larger masses in this interval. Their total contribution to Ω HI is ∼ 55 − 70%, the variation depending on the definition of population. The dominant populations at the low mass end, log 10 (M HI h 2 70 /M ) ≤ 8.0 are the faint blue and faint bluer populations, the latter's dominance being sensitive to its definition. The full blue (blue-bluer bright and faint) population represents ∼ 80% of Ω HI . A bimodal HIMF suggested by our results is however not seen since the amplitude of the HIMF of the bright red population is small compared to that of the bright blue population.

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“…In Refs. [25,26,27], the authors have investigated that BD theory explains the late time accelerated expansion of the universe and also conciliates the observation data. It is also to be noticed that BD theory of gravitation reduces to GR if scalar field is constant and ω → ∞ [28,29].…”

Section: Introductionmentioning

confidence: 64%

Constraining Bianchi type V universe with recent H(z) and BAO observations in Brans–Dicke theory of gravitation

Prasad

Yadav²,

Yadav³

2020

Eur. Phys. J. Plus

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In this paper, we investigate a transitioning model of Bianchi type V universe in Brans-Dicke theory of gravitation. The derived model not only validates Mach's principle but also describes the present acceleration of the universe. In this paper, our aim is to constrain an exact Bianchi type V universe in Brans -Dicke gravity. For this sake, firstly we obtain an exact solution of field equations in modified gravity and secondly constrain the model parameters by bounding the model with recent H(z) and Baryon acoustic oscillations (BAO) observational data. The current phase of accelerated expansion of the universe is also described by the contribution coming from cosmological constant screened scalar field with deceleration parameter showing a transition redshift of about z t = 0.79. Some physical properties of the universe are also discussed.

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The spatial distribution of neutral hydrogen as traced by low H i mass galaxies

Cited by 30 publications

References 73 publications

The atomic hydrogen content of the post-reionization Universe

The atomic hydrogen content of the post-reionization Universe

The population of galaxies that contribute to the H i mass function

Constraining Bianchi type V universe with recent H(z) and BAO observations in Brans–Dicke theory of gravitation

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