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Nustar reveals an intrinsically x-ray weak broad absorption line quasar in the ultraluminous infrared galaxy markarian 231
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Comastri, A. Farrah, D. Risaliti, G. Teng, Stacy H. Fabian, A. C. Madsen, K. K. Gandhi, P. Boggs, S. E. Craig, W. W. Wik, D. R. Hailey, C. J. Stern, D. Harrison, F. A. Fiore, F. Veilleux, S. Alexander, D. M. Christensen, F. E. Bauer, F. E. Hickox, R. C. Walton, D. J. Grefenstette, B. W. Luo, B. Ptak, A. F. Rigby, Jane Rebecca Saz, C. Zhang, W. W. |
| Copyright Year | 2014 |
| Description | 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 N(sub H) approx. 1.2(sup +0.3) sub-0.3) x 10(exp 23) / sq cm) column. The intrinsic X-ray luminosity L(sub 0.5-30 Kev) approx. 1.0 x 10(exp 43) erg /s) is extremely weak relative to the bolometric luminosity where the 2-10 keV to bolometric luminosity ratio is approx. 0.03% compared to the typical values of 2-15%. Additionally, Mrk 231 has a low X-ray-to-optical power law slope alpha(sub 0X) approx. -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. |
| File Size | 421373 |
| Page Count | 15 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140005420 |
| Archival Resource Key | ark:/13960/t29937d14 |
| Language | English |
| Publisher Date | 2014-01-01 |
| Access Restriction | Open |
| Subject Keyword | Reveals Nustar Intrinsically Quasars Spectral Energy Distribution Luminosity Bolometers Markarian Galaxies X Ray Optics Fine Structure Active Galactic Nuclei Brandt. W. N. Spectroscopic Telescopes Infrared Radiation X Ray Spectra X Ray Astrophysics Facility Black Holes Astronomy X Ray Absorption Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
