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Title: THE SURPRISING ABSENCE OF ABSORPTION IN THE FAR-ULTRAVIOLET SPECTRUM OF Mrk 231

Abstract

Mrk 231, the nearest (z = 0.0422) quasar, hosts both a galactic-scale wind and a nuclear-scale iron low-ionization broad absorption line (FeLoBAL) outflow. We recently obtained a far-ultraviolet (FUV) spectrum of this object covering {approx}1150-1470 A with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. This spectrum is highly peculiar, highlighted by the presence of faint ({approx}<2% of predictions based on H{alpha}), broad ({approx}>10,000 km s{sup -1} at the base), and highly blueshifted (centroid at {approx} -3500 km s{sup -1}) Ly{alpha} emission. The FUV continuum emission is slightly declining at shorter wavelengths (consistent with F {sub {lambda}}{proportional_to}{lambda}{sup 1.7}) and does not show the presence of any obvious photospheric or wind stellar features. Surprisingly, the FUV spectrum also does not show any unambiguous broad absorption features. It thus appears to be dominated by the AGN, rather than hot stars, and virtually unfiltered by the dusty FeLoBAL screen. The observed Ly{alpha} emission is best explained if it is produced in the outflowing BAL cloud system, while the Balmer lines arise primarily from the standard broad emission line region seen through the dusty (A{sub V} {approx} 7 mag) broad absorption line region. Two possible geometric models are discussed in the contextmore » of these new results.« less

Authors:
; ;  [1];  [2];  [3];  [4];  [5]; ; ; ;  [6];  [7];  [8];  [9]
  1. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
  2. Department of Astronomy, University of Florida, Gainesville, FL 32611 (United States)
  3. Department of Physics, Rhodes College, Memphis, TN 38112 (United States)
  4. Department of Astronomy, University of Massachussetts, Amherst, MA 01003 (United States)
  5. School of Physics and Astronomy and the Wise Observatory, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978 (Israel)
  6. Max-Planck-Institut fuer extraterrestrische Physik, Postfach 1312, D-85741 Garching (Germany)
  7. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  8. Observational Cosmology Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
  9. Cavendish Laboratory, University of Cambridge, 19 J. J. Thomson Avenue, Cambridge CB3 0HE (United Kingdom)
Publication Date:
OSTI Identifier:
22167067
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 764; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; BALMER LINES; CLOUDS; EMISSION; FAR ULTRAVIOLET RADIATION; FORECASTING; GALAXIES; GEOMETRY; IRON; QUASARS; SPECTRA; STARS; STELLAR WINDS; TELESCOPES

Citation Formats

Veilleux, S., Trippe, M., Krug, H., Hamann, F., Rupke, D. S. N., Tripp, T. M., Netzer, H., Lutz, D., Genzel, R., Sturm, E., Tacconi, L., Sembach, K. R., Teng, S. H., and Maiolino, R., E-mail: hkrug@astro.umd.edu, E-mail: veilleux@astro.umd.edu, E-mail: trippe@astro.umd.edu. THE SURPRISING ABSENCE OF ABSORPTION IN THE FAR-ULTRAVIOLET SPECTRUM OF Mrk 231. United States: N. p., 2013. Web. doi:10.1088/0004-637X/764/1/15.
Veilleux, S., Trippe, M., Krug, H., Hamann, F., Rupke, D. S. N., Tripp, T. M., Netzer, H., Lutz, D., Genzel, R., Sturm, E., Tacconi, L., Sembach, K. R., Teng, S. H., & Maiolino, R., E-mail: hkrug@astro.umd.edu, E-mail: veilleux@astro.umd.edu, E-mail: trippe@astro.umd.edu. THE SURPRISING ABSENCE OF ABSORPTION IN THE FAR-ULTRAVIOLET SPECTRUM OF Mrk 231. United States. doi:10.1088/0004-637X/764/1/15.
Veilleux, S., Trippe, M., Krug, H., Hamann, F., Rupke, D. S. N., Tripp, T. M., Netzer, H., Lutz, D., Genzel, R., Sturm, E., Tacconi, L., Sembach, K. R., Teng, S. H., and Maiolino, R., E-mail: hkrug@astro.umd.edu, E-mail: veilleux@astro.umd.edu, E-mail: trippe@astro.umd.edu. Sun . "THE SURPRISING ABSENCE OF ABSORPTION IN THE FAR-ULTRAVIOLET SPECTRUM OF Mrk 231". United States. doi:10.1088/0004-637X/764/1/15.
@article{osti_22167067,
title = {THE SURPRISING ABSENCE OF ABSORPTION IN THE FAR-ULTRAVIOLET SPECTRUM OF Mrk 231},
author = {Veilleux, S. and Trippe, M. and Krug, H. and Hamann, F. and Rupke, D. S. N. and Tripp, T. M. and Netzer, H. and Lutz, D. and Genzel, R. and Sturm, E. and Tacconi, L. and Sembach, K. R. and Teng, S. H. and Maiolino, R., E-mail: hkrug@astro.umd.edu, E-mail: veilleux@astro.umd.edu, E-mail: trippe@astro.umd.edu},
abstractNote = {Mrk 231, the nearest (z = 0.0422) quasar, hosts both a galactic-scale wind and a nuclear-scale iron low-ionization broad absorption line (FeLoBAL) outflow. We recently obtained a far-ultraviolet (FUV) spectrum of this object covering {approx}1150-1470 A with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. This spectrum is highly peculiar, highlighted by the presence of faint ({approx}<2% of predictions based on H{alpha}), broad ({approx}>10,000 km s{sup -1} at the base), and highly blueshifted (centroid at {approx} -3500 km s{sup -1}) Ly{alpha} emission. The FUV continuum emission is slightly declining at shorter wavelengths (consistent with F {sub {lambda}}{proportional_to}{lambda}{sup 1.7}) and does not show the presence of any obvious photospheric or wind stellar features. Surprisingly, the FUV spectrum also does not show any unambiguous broad absorption features. It thus appears to be dominated by the AGN, rather than hot stars, and virtually unfiltered by the dusty FeLoBAL screen. The observed Ly{alpha} emission is best explained if it is produced in the outflowing BAL cloud system, while the Balmer lines arise primarily from the standard broad emission line region seen through the dusty (A{sub V} {approx} 7 mag) broad absorption line region. Two possible geometric models are discussed in the context of these new results.},
doi = {10.1088/0004-637X/764/1/15},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 764,
place = {United States},
year = {2013},
month = {2}
}