The formation of stellar nuclear discs in bar-induced gas inflows

Cole, David R.; Debattista, Victor P.; Erwin, Peter; Earp, Samuel W. F.; Roškar, Rok

doi:10.1093/mnras/stu1985

Cited by 78 publications

(133 citation statements)

References 96 publications

(119 reference statements)

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…For the RT calculation, we considered the model after 10 Gyr of evolution. At this epoch, Cole et al (2014) show that the model has a prominent nuclear disc while Ness et al (2014) show that the bulge has a range of stellar ages. The galaxy global parameters can be found in Table 1.…”

Section: The N-body+sph Galaxy Simulationmentioning

confidence: 98%

Predicting the stellar and non-equilibrium dust emission spectra of high-resolution simulated galaxies with dart-ray

Natale¹,

Popescu²,

Tuffs³

et al. 2015

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

We describe the calculation of the stochastically heated dust emission using the 3D ray-tracing dust radiative transfer code DART-Ray, which is designed to solve the dust radiative transfer problem for galaxies with arbitrary geometries. In order to reduce the time required to derive the non-equilibrium dust emission spectra from each volume element within a model, we implemented an adaptive SED library approach, which we tested for the case of axisymmetric galaxy geometries. To show the capabilities of the code, we applied DART-Ray to a highresolution N-body+SPH galaxy simulation to predict the appearance of the simulated galaxy at a set of wavelengths from the UV to the sub-mm. We analyse the results to determine the effect of dust on the observed radial and vertical profiles of the stellar emission as well as on the attenuation and scattering of light from the constituent stellar populations. We also quantify the proportion of dust re-radiated stellar light powered by young and old stellar populations, both bolometrically and as a function of infrared wavelength.

show abstract

Section: The N-body+sph Galaxy Simulationmentioning

confidence: 98%

Predicting the stellar and non-equilibrium dust emission spectra of high-resolution simulated galaxies with dart-ray

Natale¹,

Popescu²,

Tuffs³

et al. 2015

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…The relatively high gas inflow rate to the centre of the model, with the attendant angular momentum transport and high star formation rate, is probably the source of this slow growth. Cole et al (2014) showed that this gas inflow produces a nuclear disc, which Debattista et al (2015) proposed is the origin of the high-velocity peaks seen in the mid-plane line-of-sight velocity distributions at l 6 • − 8 • in the APOGEE data (Nidever et al 2012). (Alternatively Aumer & Schönrich 2015, proposed that these high-velocity peaks are produced by young stars trapped by the bar from the disc.…”

Section: Caveats About the Modelmentioning

confidence: 99%

“…We consider the evolution of the model presented by Cole et al (2014) and Ness et al (2014). Briefly, in this simulation, a disc galaxy forms entirely out of gas cooling from a spherical corona and settling into a disc, triggering continuous star formation.…”

Section: Simulation With Star Formationmentioning

confidence: 99%

“…The simulation tracks the dispersal of iron and oxygen, using the yields of Raiteri et al (1996, SN II), Thielemann et al (1986, SN Ia), and Weidemann (1987, stellar winds), allowing us to dissect the model not just by age, but also by metallicity, [Fe/H], and α-enhancement, [O/Fe]. Cole et al (2014) showed that the model forms between 2 and 4 Gyr, slowly growing longer after then (their figs 1 and 2). By 10 Gyr, a B/P-shaped bulge has formed as can be seen in fig.…”

Section: Simulation With Star Formationmentioning

confidence: 99%

See 1 more Smart Citation

Separation of stellar populations by an evolving bar: implications for the bulge of the Milky Way

Debattista

Ness

Gonzalez

et al. 2017

Monthly Notices of the Royal Astronomical Society

Self Cite

148

255

View full text Add to dashboard Cite

We present a novel interpretation of the previously puzzling different behaviours of stellar populations of the Milky Way's bulge. We first show, by means of pure N -body simulations, that initially co-spatial stellar populations with different in-plane random motions separate when a bar forms. The radially cooler populations form a strong bar, and are vertically thin and peanut-shaped, while the hotter populations form a weaker bar and become a vertically thicker box. We demonstrate that it is the radial, not the vertical, velocity dispersion that dominates this evolution. Assuming that early stellar discs heat rapidly as they form, then both the in-plane and vertical random motions correlate with stellar age and chemistry, leading to different density distributions for metal-rich and metal-poor stars. We then use a high-resolution simulation, in which all stars form out of gas, to demonstrate that this is what happens. When we apply these results to the Milky Way we show that a very broad range of observed trends for ages, densities, kinematics and chemistries, that have been presented as evidence for contradictory paths to the formation of the bulge, are in fact consistent with a bulge which formed from a continuum of disc stellar populations which were kinematically separated by the bar. For the first time we are able to account for the bulge's main trends via a model in which the bulge formed largely in situ. Since the model is generic, we also predict the general appearance of stellar population maps of external edge-on galaxies.

show abstract

“…Combes & Gerin 1985;Athanassoula 1992bAthanassoula , 2005Sellwood & Wilkinson 1993;Piner et al 1995;Sakamoto et al 1999;Rautiainen & Salo 2000;Regan & Teuben 2003Sheth et al 2005;Wozniak 2007;Knapen 2007;Gadotti 2009;Kim et al 2012;Cole et al 2014;Emsellem et al 2015;Sormani et al 2015, and references therein). The inflow of gas may trigger inner discs and/or nuclear rings comprised of recently formed stars, at or near the inner Lindblad resonance (ILR) associated with the bar or rather at the region dominated by the bar × 2 orbits.…”

Section: Introductionmentioning

confidence: 99%

MUSE tells the story of NGC 4371: The dawning of secular evolution

Gadotti¹,

Seidel²,

Sánchez‐Blázquez³

et al. 2015

A&A

134

View full text Add to dashboard Cite

We use data from the Multi-Unit Spectroscopic Explorer (MUSE), recently commissioned at the Very Large Telescope (VLT), to study the kinematics and stellar population content of NGC 4371, an early-type massive barred galaxy in the core of the Virgo cluster. We integrate this study with a detailed structural analysis using imaging data from the Hubble and Spitzer Space Telescopes, which allows us to perform a thorough investigation of the physical properties of the galaxy. We show that the rotationally supported inner components in NGC 4371, i.e. an inner disc and a nuclear ring -which, according to the predominant scenario, are built with stars formed from gas brought to the inner region by the bar -are vastly dominated by stars older than 10 Gyr. Our results thus indicate that the formation of the bar occurred at a redshift of about z = 1.8 +0.5 −0.4 (error bars are derived from 100 Monte Carlo realisations). NGC 4371 thus testifies to the robustness of bars. In addition, the mean stellar age of the portion of the major disc of the galaxy that is covered by our MUSE data is above 7 Gyr with a small contribution from younger stars. This suggests that the quenching of star formation in NGC 4371, which is very likely an environmental effect, was already occurring at a redshift of about z = 0.8 +0.2 −0.1 . Our results suggest that bar-driven secular evolution processes may have an extended impact on the evolution of galaxies, and thus on the properties of galaxies as observed today, and not necessarily be restricted to more recent cosmic epochs.

show abstract

The formation of stellar nuclear discs in bar-induced gas inflows

Cited by 78 publications

References 96 publications

Predicting the stellar and non-equilibrium dust emission spectra of high-resolution simulated galaxies with dart-ray

Predicting the stellar and non-equilibrium dust emission spectra of high-resolution simulated galaxies with dart-ray

Separation of stellar populations by an evolving bar: implications for the bulge of the Milky Way

MUSE tells the story of NGC 4371: The dawning of secular evolution

Contact Info

Product

Resources

About