A stratified ultrafast outflow in 1H0707-495?
Abstract
Ultrafast outflows (UFOs) have recently been found in the spectra of a number of active galactic nuclei (AGN) and are strong candidates for driving AGN feedback. 1H0707-495 is a highly accreting narrow line Seyfert 1 and the second most X-ray variable bright AGN. Previous studies found evidence of blueshifted absorption at 0.1-0.2c in its spectrum. We perform a flux-resolved analysis of the full XMM-Newton data set on this AGN using both CCD and grating data, focusing on the low flux spectrum. We find strong evidence for a UFO in absorption at ∼0.13c, with an ionization parameter log (ξ/erg cm s-1) = 4.3. Surprisingly, we also detect blueshifted photoionized emission, with the velocity increasing at higher ionization states, consistent with a trend that has been observed in the UV spectrum of this object. The bulk of the X-ray emitting material is moving at a velocity of 8000 km s-1, with ionization parameter log (ξ/erg cm s-1) = 2.4. The wind kinetic power inferred from the UFO absorption is comparable to that of the UV and X-ray emission features despite their different velocities and ionization states, suggesting that we are viewing an energy-conserving wind slowing down and cooling at larger distances from the AGN.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 2018
- DOI:
- 10.1093/mnras/sty2342
- arXiv:
- arXiv:1808.08204
- Bibcode:
- 2018MNRAS.481..947K
- Keywords:
-
- accretion;
- accretion discs;
- black hole physics;
- galaxies: individual: 1H0707-495;
- galaxies: Seyfert;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication in MNRAS. 8 pages, 3 figures, 2 tables