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标题：Chandra imaging of the ~kpc extended outflow in 1H 0419-577
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作者：L. Di Gesu ; E. Costantini ; E. Piconcelli 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2017
卷号：608
页码：1-10
DOI：10.1051/0004-6361/201731853
语种：English
出版社：EDP Sciences
摘要：The Seyfert 1 galaxy 1H 0419-577 hosts a~kpc extended outflow that is evident in the [O iii] image and that is also detected as a warm absorber in the UV/X-ray spectrum. Here, we analyze a~30 ksChandra-ACIS X-ray image, with the aim of resolving the diffuse extranuclear X-ray emission and of investigating its relationship with the galactic outflow. Thanks to its sub-arcsecond spatial resolution,Chandraresolves the circumnuclear X-ray emission, which extends up to a projected distance of at least~16 kpc from the center. The morphology of the diffuse X-ray emission is spherically symmetrical. We could not recover a morphological resemblance between the soft X-ray emission and the ionization bicone that is traced by the [O iii] outflow. Our spectral analysis indicates that one of the possible explanations for the extended emission is thermal emission from a low-density (nH~ 10-3cm-3) hot plasma (Te~ 0.22keV). If this is the case, we may be witnessing the cooling of a shock-heated wind bubble. In this scenario, the [O iii] emission line and the X-ray/UV absorption lines may trace cooler clumps that are entrained in the hot outflow. Alternatively, the extended emission could be to due to a blend of emission lines from a photoionized gas component having a hydrogen column density ofNH~ 2.1 × 1022cm-2and an ionization parameter oflog ξ~ 1.3. Because the source is viewed almost edge-on we argue that the photoionized gas nebula must be distributed mostly along the polar directions, outside our line of sight. In this geometry, the X-ray/UV warm absorber must trace a different gas component, physically disconnected from the emitting gas, and located closer to the equatorial plane.
关键词：enquasars: generalquasars: emission linesquasars: absorption linesgalaxies: individual: 1H 0419-577X-rays: galaxies