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26 April 2024 |
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A Budget and Accounting of Metals at z~0: Results from the COS-Halos Survey | | Molly S. Peeples
; Jessica K. Werk
; Jason Tumlinson
; Benjamin D. Oppenheimer
; J. Xavier Prochaska
; Neal Katz
; | | Date: |
8 Oct 2013 | | Abstract: | We present a budget and accounting of metals in and around star-forming
galaxies at z~0. We use empirically derived star formation histories and
updated supernova and AGB yields and rates to estimate the total mass of metals
produced by galaxies with present-day stellar mass of 10^9.3--10^11.6 Msun. On
the accounting side, we show that a surprisingly constant 20--25% mass fraction
of produced metals remain in galaxies’ stars, interstellar gas and interstellar
dust, with little dependence of this fraction on the galaxy stellar mass. Thus,
the bulk of metals are outside of galaxies, produced in the progenitors of
today’s L^* galaxies. The COS-Halos survey is uniquely able to measure the mass
of metals in the circumgalactic medium (out to impact parameters of < 150 kpc)
of low-redshift ~L* galaxies. Using these data, we map the distribution of CGM
metals as traced by both the highly ionized OVI ion and a suite of
low-ionization species; combined with constraints on circumgalactic dust and
hotter X-ray emitting gas out to similar impact parameters, we show that ~40%
of metals produced by Mstar~10^10.1 Msun galaxies can be easily accounted for
out to 150 kpc. With the current data, we cannot rule out a constant mass of
metals within this fixed physical radius. This census provides a crucial
boundary condition for the eventual fate of metals in galaxy evolution models. | | Source: | arXiv, 1310.2253 | | Services: | Forum | Review | PDF | Favorites | |
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