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NuSTARREVEALS AN INTRINSICALLY X-RAY WEAK BROAD ABSORPTION LINE QUASAR IN THE ULTRALUMINOUS INFRARED GALAXY MARKARIAN 231

Stacy H. Teng, W. N. Brandt, F. A. Harrison, B. Luo, D. M. Alexander, F. E. Bauer, S. E. Boggs, F. E. Christensen, A. Comastri, W. W. Craig, A. C. Fabian, D. Farrah (+15 others)
2014 Astrophysical Journal  

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2014 pre-print
arXiv:1402.4811v1 fatcat:ws7pjkd2vndkbbuzfosvq76ufy
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
more » ... 231 is absorbed by a patchy and Compton-thin (N_ H∼1.2^+0.3_-0.3×10^23 cm^-2) column. The intrinsic X-ray luminosity (L_ 0.5-30 keV∼1.0×10^43 erg s^1) is extremely weak relative to the bolometric luminosity where the 2--10 keV to bolometric luminosity ratio is ∼0.03 a low X-ray-to-optical power law slope (α_ OX∼-1.7). It is a local example of a low-ionization broad absorption line (LoBAL) 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.
doi:10.1088/0004-637x/785/1/19 fatcat:rwzud4qm2vcljk6jnjyep2adn4
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Stacy H. Teng, W. N. Brandt, F. A. Harrison, B. Luo, D. M. Alexander, F. E. Bauer, S. E. Boggs, F. E. Christensen, A. Comastri, W. W. Craig, A. C. Fabian, D. Farrah, F. Fiore, P. Gandhi, B. W. Grefenstette, C. J. Hailey, R. C. Hickox, K. K. Madsen, A. F. Ptak, J. R. Rigby, G. Risaliti, C. Saez, D. Stern, S. Veilleux, D. J. Walton, D. R. Wik, W. W. Zhang. "NuSTARREVEALS AN INTRINSICALLY X-RAY WEAK BROAD ABSORPTION LINE QUASAR IN THE ULTRALUMINOUS INFRARED GALAXY MARKARIAN 231." Astrophysical Journal 785.1 (2014) 19