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- W2082230709 abstract "We present high-energy (3–30 keV) NuSTAR observations of the nearest quasar, the ultraluminous infrared galaxy (ULIRG) Markarian 231 (Mrk 231), supplemented with new and simultaneous low-energy (0.5–8 keV) data from Chandra. The source was detected, though at much fainter levels than previously reported, likely due to contamination in the large apertures of previous non-focusing hard X-ray telescopes. The full band (0.5–30 keV) X-ray spectrum suggests the active galactic nucleus (AGN) in Mrk 231 is absorbed by a patchy and Compton-thin ( cm−2) column. The intrinsic X-ray luminosity (L0.5 − 30 keV ∼ 1.0 × 1043 erg s−1) is extremely weak relative to the bolometric luminosity where the 2–10 keV to bolometric luminosity ratio is ∼0.03% compared to the typical values of 2%–15%. Additionally, Mrk 231 has a low X-ray-to-optical power law slope (αOX ∼ −1.7). It is a local example of a low-ionization broad absorption line quasar that is intrinsically X-ray weak. The weak ionizing continuum may explain the lack of mid-infrared [O iv], [Ne v], and [Ne vi] fine-structure emission lines which are present in sources with otherwise similar AGN properties. We argue that the intrinsic X-ray weakness may be a result of the super-Eddington accretion occurring in the nucleus of this ULIRG, and may also be naturally related to the powerful wind event seen in Mrk 231, a merger remnant escaping from its dusty cocoon." @default.
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- W2082230709 date "2014-03-21" @default.
- W2082230709 modified "2023-09-29" @default.
- W2082230709 title "<i>NuSTAR</i>REVEALS AN INTRINSICALLY X-RAY WEAK BROAD ABSORPTION LINE QUASAR IN THE ULTRALUMINOUS INFRARED GALAXY MARKARIAN 231" @default.
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