THE REST-FRAME ULTRAVIOLET SPECTRA OF UV-SELECTED ACTIVE GALACTIC NUCLEI AT z {approx} 2-3

Hainline, Kevin N; Shapley, Alice E; Greene, Jenny E; Steidel, Charles C

doi:10.1088/0004-637X/733/1/31

Title: THE REST-FRAME ULTRAVIOLET SPECTRA OF UV-SELECTED ACTIVE GALACTIC NUCLEI AT z {approx} 2-3

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Abstract

We present new results for a sample of 33 narrow-lined UV-selected active galactic nuclei (AGNs), identified in the course of a spectroscopic survey for star-forming galaxies at z {approx} 2-3. The rest-frame UV composite spectrum for our AGN sample shows several emission lines characteristic of AGNs, as well as interstellar absorption features detected in star-forming Lyman break galaxies (LBGs). We report a detection of N IV] {lambda}1486, which has been observed in high-redshift radio galaxies, as well as in rare optically selected quasars. The UV continuum slope of the composite spectrum is significantly redder than that of a sample of non-AGN UV-selected star-forming galaxies. Blueshifted Si IV absorption provides evidence for outflowing highly ionized gas in these objects at speeds of {approx}10{sup 3} km s{sup -1}, quantitatively different from what is seen in the outflows of non-AGN LBGs. Grouping the individual AGNs by parameters such as the Ly{alpha} equivalent width, redshift, and UV continuum magnitude allows for an analysis of the major spectroscopic trends within the sample. Stronger Ly{alpha} emission is coupled with weaker low-ionization absorption, which is similar to what is seen in the non-AGN LBGs, and highlights the role that cool interstellar gas plays in the escape ofmore »« less

Authors:

Hainline, Kevin N; Shapley, Alice E ^[1]; Greene, Jenny E ^[2]; Steidel, Charles C ^[3]

Department of Astronomy, University of California, Los Angeles, 430 Portola Plaza, Los Angeles, CA 90024 (United States)
Department of Astronomy, University of Texas, Austin, TX 78712 (United States)
California Institute of Technology, MS 105-24, Pasadena, CA 91125 (United States)

Publication Date:: Fri May 20 00:00:00 EDT 2011

OSTI Identifier:: 21576812

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 733; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/733/1/31; Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; GALACTIC EVOLUTION; GALAXY NUCLEI; LYMAN LINES; RADIO GALAXIES; RED SHIFT; ULTRAVIOLET SPECTRA; COSMIC RADIO SOURCES; EVOLUTION; GALAXIES; SORPTION; SPECTRA

Citation Formats


                    Hainline, Kevin N, Shapley, Alice E, Greene, Jenny E, and Steidel, Charles C. THE REST-FRAME ULTRAVIOLET SPECTRA OF UV-SELECTED ACTIVE GALACTIC NUCLEI AT z {approx} 2-3.  United States: N. p., 2011. 
        Web.  doi:10.1088/0004-637X/733/1/31.

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                    Hainline, Kevin N, Shapley, Alice E, Greene, Jenny E, & Steidel, Charles C. THE REST-FRAME ULTRAVIOLET SPECTRA OF UV-SELECTED ACTIVE GALACTIC NUCLEI AT z {approx} 2-3.  United States.  https://doi.org/10.1088/0004-637X/733/1/31

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                    Hainline, Kevin N, Shapley, Alice E, Greene, Jenny E, and Steidel, Charles C. 2011.  
        "THE REST-FRAME ULTRAVIOLET SPECTRA OF UV-SELECTED ACTIVE GALACTIC NUCLEI AT z {approx} 2-3".  United States.  https://doi.org/10.1088/0004-637X/733/1/31.

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@article{osti_21576812,

  title        = {THE REST-FRAME ULTRAVIOLET SPECTRA OF UV-SELECTED ACTIVE GALACTIC NUCLEI AT z {approx} 2-3},

  author       = {Hainline, Kevin N and Shapley, Alice E and Greene, Jenny E and Steidel, Charles C},

  abstractNote = {We present new results for a sample of 33 narrow-lined UV-selected active galactic nuclei (AGNs), identified in the course of a spectroscopic survey for star-forming galaxies at z {approx} 2-3. The rest-frame UV composite spectrum for our AGN sample shows several emission lines characteristic of AGNs, as well as interstellar absorption features detected in star-forming Lyman break galaxies (LBGs). We report a detection of N IV] {lambda}1486, which has been observed in high-redshift radio galaxies, as well as in rare optically selected quasars. The UV continuum slope of the composite spectrum is significantly redder than that of a sample of non-AGN UV-selected star-forming galaxies. Blueshifted Si IV absorption provides evidence for outflowing highly ionized gas in these objects at speeds of {approx}10{sup 3} km s{sup -1}, quantitatively different from what is seen in the outflows of non-AGN LBGs. Grouping the individual AGNs by parameters such as the Ly{alpha} equivalent width, redshift, and UV continuum magnitude allows for an analysis of the major spectroscopic trends within the sample. Stronger Ly{alpha} emission is coupled with weaker low-ionization absorption, which is similar to what is seen in the non-AGN LBGs, and highlights the role that cool interstellar gas plays in the escape of Ly{alpha} photons. However, the AGN composite does not show the same trends between Ly{alpha} strength and extinction seen in the non-AGN LBGs. These results represent the first such comparison at high redshift between star-forming galaxies and similar galaxies that host AGN activity.},

  doi          = {10.1088/0004-637X/733/1/31},

  url          = {https://www.osti.gov/biblio/21576812},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 733,

  place        = {United States},

  year         = {Fri May 20 00:00:00 EDT 2011},

  month        = {Fri May 20 00:00:00 EDT 2011}

}

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https://doi.org/10.1088/0004-637X/733/1/31

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