The Reionization of Galactic Satellite Populations

Ocvirk, Pierre; Gillet, Nicolas; Aubert, Dominique; Knebe, Alexander; Libeskind, Noam I.; Chardin, Jonathan; Gottlöber, Stefan; Yepes, Gustavo; Hoffman, Yehuda

doi:10.1088/0004-637x/794/1/20

Cited by 21 publications

(29 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the whole, more massive satellites reionize earlier. Similar to Ocvirk et al (2014), we also find that satellites that are closer to their host galaxy at z = 0 tend to reionize earlier. This trend is not directly due to proximity to the host halo during reionization, as the relation is weaker (if present at all) at that time.…”

Section: Discussionsupporting

confidence: 76%

Reionization of the Milky Way, M31, and their satellites – I. Reionization history and star formation

Dixon

Iliev

Gottlöber

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Observations of the Milky Way (MW), M31, and their vicinity, known as the Local Group (LG), can provide clues about the sources of reionization. We present a suite of radiative transfer simulations based on initial conditions provided by the Constrained Local UniversE Simulations (CLUES) project that are designed to recreate the Local Universe, including a realistic MW-M31 pair and a nearby Virgo. Our box size (91 Mpc) is large enough to incorporate the relevant sources of ionizing photons for the LG. We employ a range of source models, mimicking the potential effects of radiative feedback for dark matter haloes between ∼ 10 8 −10 9 M ⊙ . Although the LG mostly reionizes in an inside-out fashion, the final 40 per cent of its ionization shows some outside influence. For the LG satellites, we find no evidence that their redshift of reionization is related to the present-day mass of the satellite or the distance from the central galaxy. We find that less than 20 per cent of present-day satellites for MW and M31 have undergone any star formation prior to the end of global reionization. Approximately five per cent of these satellites could be classified as fossils, meaning the majority of star formation occurred at these early times. The more massive satellites have more cumulative star formation prior to the end of global reionization, but the scatter is significant, especially at the low-mass end. Present-day mass and distance from the central galaxy are poor predictors for the presence of ancient stellar populations in satellite galaxies.

show abstract

Section: Discussionsupporting

confidence: 76%

Reionization of the Milky Way, M31, and their satellites – I. Reionization history and star formation

Dixon

Iliev

Gottlöber

et al. 2018

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…As a result, large haloes typically undergo internal (inside-out) reionization, while low-mass haloes on average are reionized by distant sources (outside-in). This pattern is supported by simulations of the Local Group of galaxies, which find that low-mass satellites preferentially undergo external reionization due to the inside-out reionization imprinted by massive haloes (Weinmann et al 2007;Ocvirk et al 2014). While we do find that the SFR is increasingly suppressed towards lower halo masses, low-mass dwarfs are able to continue forming stars throughout the EoR, in contrast with recent works with lower numerical resolution (e.g.…”

Section: Suppression Mechanismsmentioning

confidence: 61%

Using artificial neural networks to constrain the halo baryon fraction during reionization

Sullivan

Iliev

Dixon³

2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Radiative feedback from stars and galaxies has been proposed as a potential solution to many of the tensions with simplistic galaxy formation models based on ΛCDM, such as the faint end of the UV luminosity function. The total energy budget of radiation could exceed that of galactic winds and supernovae combined, which has driven the development of sophisticated algorithms that evolve both the radiation field and the hydrodynamical response of gas simultaneously, in a cosmological context. We probe self-feedback on galactic scales using the adaptive mesh refinement, radiative transfer, hydrodynamics, and N-body code ramses-rt. Unlike previous studies which assume a homogeneous UV background, we self-consistently evolve both the radiation field and gas to constrain the halo baryon fraction during cosmic reionization. We demonstrate that the characteristic halo mass with mean baryon fraction half the cosmic mean, M c (z), shows very little variation as a function of mass-weighted ionization fraction. Furthermore, we find that the inclusion of metal cooling and the ability to resolve scales small enough for self-shielding to become efficient leads to a significant drop in M c when compared to recent studies. Finally, we develop an Artificial Neural Network that is capable of predicting the baryon fraction of haloes based on recent tidal interactions, gas temperature, and mass-weighted ionization fraction. Such a model can be applied to any reionization history, and trivially incorporated into semi-analytical models of galaxy formation.

show abstract

“…ATON is described in Aubert & Teyssier (2008) and has been mainly used to model hydrogen reionisation (Aubert & Teyssier 2010, Chardin et al 2012) and in particular the reionisation of our Local Goup of galaxies (Ocvirk et al 2013 andOcvirk et al 2014). ATON employs a moment-based description of the radiative transfer equation, based on the M1 approximation that provides a simple and local closure relation between radiative pressure and radiative energy density.…”

Section: Radiative Transfer In Post-processing With Atonmentioning

confidence: 99%

Calibrating cosmological radiative transfer simulations with Ly α forest data: evidence for large spatial UV background fluctuations atz∼ 5.6–5.8 due to rare bright sources

Chardin¹,

Haehnelt²,

Aubert

et al. 2015

Mon. Not. R. Astron. Soc.

136

View full text Add to dashboard Cite

We calibrate here cosmological radiative transfer simulations with ATON/RAMSES with a range of measurements of the Lyα opacity from QSO absorption spectra. We find the Lyα opacity to be very sensitive to the exact timing of hydrogen reionisation. Models reproducing the measured evolution of the mean photoionisation rate and average mean free path reach overlap at z ∼ 7 and predict an accelerated evolution of the Lyα opacity at z > 6 consistent with the rapidly evolving luminosity function of Lyα emitters in this redshift range. Similar to "optically thin" simulations our full radiative transfer simulations fail, however, to reproduce the high-opacity tail of the Lyα opacity PDF at z > 5. We argue that this is due to spatial UV fluctuations in the post-overlap phase of reionisation on substantially larger scales than predicted by our source model, where the ionising emissivity is dominated by large numbers of sub-L * galaxies. We further argue that this suggests a significant contribution to the ionising UV background by much rarer bright sources at high redshift.

show abstract

The Reionization of Galactic Satellite Populations

Cited by 21 publications

References 77 publications

Reionization of the Milky Way, M31, and their satellites – I. Reionization history and star formation

Reionization of the Milky Way, M31, and their satellites – I. Reionization history and star formation

Using artificial neural networks to constrain the halo baryon fraction during reionization

Calibrating cosmological radiative transfer simulations with Ly α forest data: evidence for large spatial UV background fluctuations atz∼ 5.6–5.8 due to rare bright sources

Contact Info

Product

Resources

About