Role of galactic gaseous halos in recycling enriched winds from bulges to disks: A new bulge-disk chemical connection

Abstract

We demonstrate for the first time that gaseous halos of disk galaxies can play a vital role in recycling metal-rich gas ejected from the bulges and thus in promoting chemical evolution of disks. Our numerical simulations show that metal-rich stellar winds from bulges in disk galaxies can be accreted onto the thin disks owing to hydrodynamical interaction between the gaseous ejecta and the gaseous halos, if the mean densities of the halos (rho_ hg) are as high as 10^{-5} cm^{-3}. The total amount of gas that is ejected from a bulge through a stellar wind and then accreted onto the disk depends mainly on rho_ hg and the initial velocity of the stellar wind. About ~ 1% of gaseous ejecta from bulges in disk galaxies of scale length a_d can be accreted onto disks around R ~ 2.5 a_ d for a reasonable set of model parameters. We discuss these results in the context of the origin of the surprisingly high metallicities of the solar neighborhood disk stars in the Galaxy. We also discuss some implications of the present results in terms of chemical evolution of disk galaxies with possibly different rho_ hg in different galaxy environments.

arXiv comment13 pages, 4 figures (1 color), accepted by ApJL

References in corpus (15)

• The Structure of Cold Dark Matter Halos
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• Galactic Winds
• The Chemical Evolution of the Galaxy: the two-infall model
• alpha-, r-, and s-process element trends in the Galactic thin and thick disks
• Highly-Ionized High-Velocity Gas in the Vicinity of the Galaxy
• The Large-scale Bipolar Wind in the Galactic Center
• On the Galactic Disk Metallicity Distribution from Open Clusters I. New Catalogues and Abundance Gradient
• Abundances in metal-rich stars - Detailed abundance analysis of 47 G and K dwarf stars with [Me/H] $>$ 0.10 dex
• New results on the time variation of the radial abundance gradients from planetary nebulae
• An estimate of the time variation of the abundance gradient from planetary nebulae III. O, S, Ar, and Ne: A comparison of PN samples
• Impact of dark matter subhalos on extended HI disks of galaxies: Possible formation of HI fine structures and stars
• Optical Imaging and Spectroscopy of the Edge-On Sbc Galaxy UGC10043: Evidence for a Galactic Wind and a Peculiar Triaxial Bulge
• Time variation of radial gradients in the galactic disk: electron temperatures and abundances
• Fossil Imprints of Outflow from the Galactic Bulge in Elemental Abundances of Metal-Rich Disk Stars

Cited by in corpus (9)

• Ram pressure stripping of halo gas in disk galaxies: Implications on galactic star formation in different environments
• Fourier Photometric Analysis of Isolated Galaxies in the Context of the AMIGA Project
• Environmental Effects on the Metal Enrichment of Low Mass Galaxies in Nearby Clusters
• Evidence of Early Enrichment of the Galactic Disk by Large-Scale Winds
• Resequencing the Hubble sequence and the quadratic (black hole mass)-(spheroid stellar mass) relation for elliptical galaxies
• Metallicity Distribution of Disk Stars and the Formation History of the Milky Way
• Turn-off of Deuterium Astration in the Recent Star Formation of the Galaxy Disk
• Gas Inflow and Outflow Histories in Disk Galaxies as Revealed from Observations of Distant Star-Forming Galaxies
• Galaxies and Cluster of Galaxies as Peak Patches of the Density Field