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Testing the modern merger hypothesis via the assembly of massive blue elliptical galaxies in the local Universe

The modern merger hypothesis offers a method of forming a new elliptical galaxy through merging two equal-mass, gas-rich disc galaxies fuelling a nuclear starburst followed by efficient quenching and dynamical stabilization. A key prediction of this scenario is a central concentration of young stars...

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Published in:Monthly notices of the Royal Astronomical Society 2015-07, Vol.451 (1), p.433-454
Main Authors: Haines, Tim, McIntosh, D. H., Sánchez, S. F., Tremonti, C., Rudnick, G.
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creator Haines, Tim
McIntosh, D. H.
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description The modern merger hypothesis offers a method of forming a new elliptical galaxy through merging two equal-mass, gas-rich disc galaxies fuelling a nuclear starburst followed by efficient quenching and dynamical stabilization. A key prediction of this scenario is a central concentration of young stars during the brief phase of morphological transformation from highly disturbed remnant to new elliptical galaxy. To test this aspect of the merger hypothesis, we use integral field spectroscopy to track the stellar Balmer absorption and 4000-Å break strength indices as a function of galactic radius for 12 massive (M * ≥ 1010 M⊙), nearby (z ≤ 0.03), visually-selected plausible new ellipticals with blue-cloud optical colours and varying degrees of morphological peculiarities. We find that these index values and their radial dependence correlate with specific morphological features such that the most disturbed galaxies have the smallest 4000-Å break strengths and the largest Balmer absorption values. Overall, two-thirds of our sample are inconsistent with the predictions of the modern merger hypothesis. Of these eight, half exhibit signatures consistent with recent minor merger interactions. The other half have star formation histories similar to local, quiescent early-type galaxies. Of the remaining four galaxies, three have the strong morphological disturbances and star-forming optical colours consistent with being remnants of recent, gas-rich major mergers, but exhibit a weak, central burst consistent with forming ∼5 per cent of their stars. The final galaxy possesses spectroscopic signatures of a strong, centrally concentrated starburst and quiescent core optical colours indicative of recent quenching (i.e. a post-starburst signature) as prescribed by the modern merger hypothesis.
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ispartof Monthly notices of the Royal Astronomical Society, 2015-07, Vol.451 (1), p.433-454
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source OUP_牛津大学出版社OA刊
subjects Astronomy
Color
Colour
Elliptical galaxies
Galaxies
Integral field spectroscopy
Morphology
Quenching
Signatures
Star & galaxy formation
Star formation
Starbursts
Stars
title Testing the modern merger hypothesis via the assembly of massive blue elliptical galaxies in the local Universe
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