Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-15
Astrophys.J.646:L33-L36,2006
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ Letters, 5 pages, 3 figures
Scientific paper
10.1086/506909
HST ACS images reveal blue cores in four E+A, or post-starburst, galaxies. Follow-up spectroscopy shows that these cores have LINER spectra. The existence of LINERs, consistent with those in many elliptical galaxies, is yet one more piece of evidence that these post-merger, post-starburst, bulge-dominated galaxies will evolve into normal ellipticals. More interestingly, if LINERs are powered by low-luminosity AGN, their presence in these E+As suggests that any rapid growth phase of the central black hole ended in rough concert with the cessation of star formation. This result emphasizes the importance of E+As for exploring how the evolution of black holes and AGN may be tied to that of galactic bulges.
Tremonti Christy
Yang Yujin
Zabludoff Ann
Zaritsky Dennis
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