The Astrophysical Journal (Jan 2024)
AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations
- Maryam Dehghanian,
- Nahum Arav,
- Gerard A. Kriss,
- Missagh Mehdipour,
- Doyee Byun,
- Gwen Walker,
- Mayank Sharma,
- Aaron J. Barth,
- Misty C. Bentz,
- Benjamin D. Boizelle,
- Michael S. Brotherton,
- Edward M. Cackett,
- Elena Dalla Bontà,
- Gisella De Rosa,
- Gary J. Ferland,
- Carina Fian,
- Alexei V. Filippenko,
- Jonathan Gelbord,
- Michael R. Goad,
- Keith Horne,
- Yasaman Homayouni,
- Dragana Ilić,
- Michael D. Joner,
- Erin A. Kara,
- Shai Kaspi,
- Christopher S. Kochanek,
- Kirk T. Korista,
- Peter Kosec,
- Andjelka B. Kovačević,
- Hermine Landt,
- Collin Lewin,
- Ethan R. Partington,
- Luka Č. Popović,
- Daniel Proga,
- Daniele Rogantini,
- Matthew R. Siebert,
- Thaisa Storchi-Bergmann,
- Marianne Vestergaard,
- Timothy. Waters,
- Jian-Min Wang,
- Fatima Zaidouni,
- Ying Zu
Affiliations
- Maryam Dehghanian
- ORCiD
- Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
- Nahum Arav
- ORCiD
- Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
- Gerard A. Kriss
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
- Missagh Mehdipour
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
- Doyee Byun
- ORCiD
- Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
- Gwen Walker
- ORCiD
- Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
- Mayank Sharma
- ORCiD
- Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
- Aaron J. Barth
- ORCiD
- Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California , Irvine, CA 92697-4575, USA
- Misty C. Bentz
- ORCiD
- Department of Physics and Astronomy, Georgia State University , 25 Park Place, Suite 605, Atlanta, GA 30303, USA
- Benjamin D. Boizelle
- ORCiD
- Department of Physics and Astronomy, N284 ESC, Brigham Young University , Provo, UT 84602, USA
- Michael S. Brotherton
- ORCiD
- Department of Physics and Astronomy, University of Wyoming , Laramie, WY 82071, USA
- Edward M. Cackett
- ORCiD
- Department of Physics and Astronomy, Wayne State University , 666 W. Hancock Street, Detroit, MI 48201, USA
- Elena Dalla Bontà
- ORCiD
- Dipartimento di Fisica e Astronomia “G. Galilei,” Universitá di Padova , Vicolo dell’Osservatorio 3, I-35122 Padova, Italy; INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5 I-35122, Padova, Italy; Jeremiah Horrocks Institute, University of Central Lancashire , Preston, PR1 2HE, UK
- Gisella De Rosa
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
- Gary J. Ferland
- ORCiD
- Department of Physics and Astronomy, The University of Kentucky , Lexington, KY 40506, USA
- Carina Fian
- ORCiD
- Departamento de Astronomía y Astrofísica, Universidad de Valencia , E-46100 Burjassot, Valencia, Spain
- Alexei V. Filippenko
- ORCiD
- Department of Astronomy, University of California , Berkeley, CA 94720-3411, USA
- Jonathan Gelbord
- ORCiD
- Spectral Sciences Inc. 30 Fourth Avenue, Suite 2 Burlington, MA 01803, USA
- Michael R. Goad
- ORCiD
- School of Physics and Astronomy, University of Leicester , University Road, Leicester, LE1 7RH, UK
- Keith Horne
- ORCiD
- SUPA School of Physics and Astronomy , North Haugh, St. Andrews, KY16 9SS, Scotland, UK
- Yasaman Homayouni
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA; Department of Astronomy and Astrophysics, The Pennsylvania State University , 525 Davey Laboratory, University Park, PA 16802, USA; Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802, USA
- Dragana Ilić
- ORCiD
- University of Belgrade —Faculty of Mathematics, Department of Astronomy, Studentski trg 16, 11000 Belgrade, Serbia; Hamburger Sternwarte, Universität Hamburg , Gojenbergsweg 112, 21029 Hamburg, Germany
- Michael D. Joner
- ORCiD
- Department of Physics and Astronomy, N283 ESC, Brigham Young University , Provo, UT 84602, USA
- Erin A. Kara
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Shai Kaspi
- ORCiD
- School of Physics and Astronomy and Wise Observatory, Tel Aviv University , Tel Aviv 69978, Israel
- Christopher S. Kochanek
- ORCiD
- Department of Astronomy, The Ohio State University , 140 W. 18th Avenue, Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA
- Kirk T. Korista
- ORCiD
- Department of Physics, Western Michigan University , 1120 Everett Tower, Kalamazoo, MI 49008-5252, USA
- Peter Kosec
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Center for Astrophysics—Harvard & Smithsonian, Cambridge, MA, USA
- Andjelka B. Kovačević
- ORCiD
- University of Belgrade —Faculty of Mathematics, Department of Astronomy, Studentski trg 16, 11000 Belgrade, Serbia
- Hermine Landt
- ORCiD
- Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham DH1 3LE, UK
- Collin Lewin
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Ethan R. Partington
- ORCiD
- Department of Physics and Astronomy, Wayne State University , 666W. Hancock Street, Detroit, MI 48201, USA
- Luka Č. Popović
- ORCiD
- University of Belgrade —Faculty of Mathematics, Department of Astronomy, Studentski trg 16, 11000 Belgrade, Serbia; Astronomical Observatory Belgrade , Volgina 7, 11000 Belgrade, Serbia
- Daniel Proga
- ORCiD
- Department of Physics & Astronomy, University of Nevada , Las Vegas 4505 S. Maryland Parkway, Las Vegas, NV 89154-4002, USA
- Daniele Rogantini
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Matthew R. Siebert
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218-2410, USA
- Thaisa Storchi-Bergmann
- ORCiD
- Departamento de Astronomia—IF, Universidade Federal do Rio Grande do Sul , CP 15051, 91501-970 Porto Alegre, RS, Brazil
- Marianne Vestergaard
- ORCiD
- Steward Observatory, University of Arizona , 933 North Cherry Avenue, Tucson, AZ 85721, USA; DARK, The Niels Bohr Institute, University of Copenhagen , Jagtvej 155, DK-2200 Copenhagen, Denmark
- Timothy. Waters
- ORCiD
- X-Computational Physics Division, Los Alamos National Laboratory , NM 87545, USA
- Jian-Min Wang
- ORCiD
- Key Laboratory for Particle Astrophysics, Institute of High Energy Physics , Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049, People's Republic of China; School of Astronomy and Space Sciences, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People's Republic of China; National Astronomical Observatories of China , 20A Datun Road, Beijing 100020, People's Republic of China
- Fatima Zaidouni
- ORCiD
- MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Ying Zu
- ORCiD
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China; Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai, 200240, People's Republic of China; Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University , Shanghai 200240, People's Republic of China
- DOI
- https://doi.org/10.3847/1538-4357/ad5ff4
- Journal volume & issue
-
Vol. 972,
no. 2
p. 141
Abstract
We observed the Seyfert 1 galaxy Mrk 817 during an intensive multiwavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lines seen in the Hubble Space Telescope/Cosmic Origins Spectrograph spectra, both during the campaign and in other epochs extending over 14 yr. We conclude that, while the narrow absorption outflow system (at −3750 km s ^−1 with FWHM = 177 km s ^−1 ) responds to the variations of the UV continuum as modified by the X-ray obscurer, its total column density (log N _H = 19.5 ${}_{-0.13}^{+0.61}$ cm ^−2 ) did not change across all epochs. The adjusted ionization parameter (scaled with respect to the variations in the hydrogen-ionizing continuum flux) is log U _H = −1.0 ${}_{-0.3}^{+0.1}$ . The outflow is located at a distance smaller than 38 pc from the central source, which implies a hydrogen density of n _H > 3000 cm ^−3 . The absorption outflow system only covers the continuum emission source and not the broad emission line region, which suggests that its transverse size is small (< 10 ^16 cm), with potential cloud geometries ranging from spherical to elongated along the line of sight.
Keywords
