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• W2033717966 abstract "We report on interferometric imaging of the CO J = 1–0 and J = 3–2 line emission from the controversial QSO/galaxy pair HE 0450–2958. The detected CO J = 1–0 line emission is found associated with the disturbed companion galaxy, not the luminous QSO, and implies Mgal(H2) ∼ (1–2) × 1010 M☉, which is ≳30% of the dynamical mass in its CO-luminous region. Fueled by this large gas reservoir, this galaxy is the site of an intense starburst with SFR ∼ 370 M☉ yr −1, placing it firmly on the upper gas-rich/star-forming end of ultra luminous infrared galaxies (ULIRGs, LIR > 1012 L☉). This makes HE 0450–2958 the first case of extreme starburst and powerful QSO activity, intimately linked (triggered by a strong interaction) but not coincident. The lack of CO emission toward the QSO itself renews the controversy regarding its host galaxy by making a gas-rich spiral (the typical host of narrow-line Seyfert 1 AGNs) less likely. Finally, given that HE 0450–2958 and similar IR-warm QSOs are considered typical ULIRG → optically bright QSO transition candidates, our results raise the possibility that some may simply be gas-rich/gas-poor (e.g., spiral/elliptical) galaxy interactions which activate an optically bright unobscured QSO in the gas-poor galaxy, and a starburst in the gas-rich one. We argue that such interactions may have gone largely unnoticed even in the local universe because the combination of tools necessary to disentangle the progenitors (high-resolution and S/N optical and CO imaging) became available only recently." @default.
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• W2033717966 date "2008-09-10" @default.
• W2033717966 modified "2023-10-06" @default.
• W2033717966 title "A New Twist to an Old Story: HE 0450−2958 and the ULIRG → Optically Bright QSO Transition Hypothesis" @default.
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• W2033717966 doi "https://doi.org/10.1086/590233" @default.
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