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Delving into the depths of NGC 3783 with XRISM

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];  [10];  [15];  [16];  [11];  [17];  [18] more »;  [17] « less
  1. SRON Space Research Organisation Netherlands, Leiden (Netherlands); Leiden Univ. (Netherlands); RIKEN High Energy Astrophysics Laboratory, Wako (Japan)
  2. James Madison Univ., Harrisonburg, VA (United States)
  3. SRON Space Research Organisation Netherlands, Leiden (Netherlands); Leiden Univ. (Netherlands)
  4. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  5. Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Center for Research and Exploration in Space Science and Technology (CRESST II), Greenbelt, MD (United States)
  6. Technion-Israel Institute of Technology, Haifa (Israel); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  7. ESA European Space Astronomy Centre (ESAC), Madrid (Spain)
  8. ESA European Space Research and Technology Centre (ESTEC), Noordwijk (Netherlands)
  9. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  10. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  11. Leiden Univ. (Netherlands); SRON Space Research Organisation Netherlands, Leiden (Netherlands)
  12. Univ. of Michigan, Ann Arbor, MI (United States); Space Telescope Science Institute, Baltimore, MD (United States)
  13. Univ. of Teacher Education Fukuoka (UTEF) (Japan)
  14. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science
  15. ESA European Space Research and Technology Centre (ESTEC), Noordwijk (Netherlands); Istituto Nazionale di Astrofisica (INAF), Firenze (Italy)
  16. Kagoshima Univ. (Japan)
  17. Tohoku Univ., Sendai (Japan)
  18. Univ. of Michigan, Ann Arbor, MI (United States)
+ Show Author Affiliations
The 2024 X-ray/UV observation campaign of NGC 3783, led by XRISM, revealed the launch of an ultrafast outflow (UFO) with a radial velocity of 0.19c (57 000 km s−1). This event is synchronized with the sharp decay, within less than half a day, of a prominent soft X-ray/UV flare. Accounting for the look-elsewhere effect, the XRISM Resolve data alone indicate a low probability of 2 × 10−5 that this UFO detection is due to random chance. The UFO features narrow H-like and He-like Fe lines with a velocity dispersion of ∼1000 km s−1, suggesting that it originates from a dense clump. Beyond this primary detection, there are hints of weaker outflow signatures throughout the rise and fall phases of the soft flare. Their velocities increase from 0.05c to 0.3c over approximately three days, and they may be associated with a larger stream in which the clump is embedded. The radiation pressure is insufficient to drive the acceleration of this rapidly evolving outflow. The observed evolution of the outflow kinematics instead closely resembles that of solar coronal mass ejections, implying magnetic driving and, conceivably, reconnection near the accretion disk as the likely mechanisms behind both the UFO launch and the associated soft flare.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
3014611
Report Number(s):
LLNL--JRNL-2011234
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 704; ISSN 1432-0746; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

Astronomy and AstroPhysics
X-rays: galaxies
X-rays: individuals: NGC 3783
galaxies: Seyfert
galaxies: active
techniques: spectroscopic