Discovery of an Ultraviolet Counterpart to an Ultra-Fast X-ray Outflow in the Quasar PG1211+143
We observed the quasar PG 1211+143 using the Cosmic Origins Spectrograph on the Hubble Space Telescope in 2015 April as part of a joint campaign with the Chandra X-ray Observatory and the Jansky Very Large Array. Our ultraviolet spectra cover the wavelength range 912-2100 Å. We find a broad absorption feature () at an observed wavelength of 1240 Å. Interpreting this as H i Lyα, in the rest frame of PG 1211+143 (z = 0.0809), this corresponds to an outflow velocity of -16,980 (outflow redshift ), matching the moderate ionization X-ray absorption system detected in our Chandra observation and reported previously by Pounds et al. With a minimum H i column density of , and no absorption in other UV resonance lines, this Lyα absorber is consistent with arising in the same ultrafast outflow as the X-ray absorbing gas. The Lyα feature is weak or absent in archival ultraviolet spectra of PG 1211+143, strongly suggesting that this absorption is transient, and intrinsic to PG 1211+143. Such a simultaneous detection in two independent wavebands for the first time gives strong confirmation of the reality of an ultrafast outflow in an active galactic nucleus.
Item Type | Article |
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Uncontrolled Keywords | galaxies: active; galaxies: individual (PG 1211+143); galaxies: nuclei; galaxies: Seyfert |
Subjects |
Physics and Astronomy(all) > Astronomy and Astrophysics Earth and Planetary Sciences(all) > Space and Planetary Science |
Date Deposited | 26 Jul 2024 18:33 |
Last Modified | 26 Jul 2024 18:33 |
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Read more research from the creator(s):
- Kriss, Gerard A.
- Lee, Julia C.
- Danehkar, Ashkbiz
- Nowak, Michael A.
- Fang, Taotao
- Hardcastle, Martin J.
- Neilsen, Joseph
- Young, Andrew
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