Metallicity of the polar disk in NGC4650A: constraints for cold accretion scenario

Details Metallicity of the polar disk in NGC4650A: constraints for cold accretion scenario Metallicity of the polar disk in NGC4650A: constraints for cold accretion scenario

2009-12-10

arxiv.org/abs/0912.2042v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Proceeding of the conference "Hunting for the Dark: The Hidden Side of Galaxy Formation", Malta, 19-23 Oct. 2009

Scientific paper

We used high resolution spectra in the optical and near-infrared wavelength range to study the abundance ratios and metallicities of the HII regions associated with the polar disk in NGC4650A, in order to put constraints on the formation of the polar disk through cold gas accretion along a filament; this might be the most realistic way by which galaxies get their gas. We have compared the measured metallicities for the polar structure in NGC4650A with those of different morphological types and we have found that they are similar to those of late-type galaxies: such results is consistent with a polar disk formed by accretion from cosmic web filaments of external cold gas.

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