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Title: CO-Dark Star Formation and Black Hole Activity in 3C 368 at z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses

Abstract

We present the detection of four far-infrared fine-structure oxygen lines, as well as strong upper limits for the CO(2–1) and [N ii] 205 μ m lines, in 3C 368, a well-studied radio-loud galaxy at z = 1.131. These new oxygen lines, taken in conjunction with previously observed neon and carbon fine-structure lines, suggest a powerful active galactic nucleus (AGN), accompanied by vigorous and extended star formation. A starburst dominated by O8 stars, with an age of ∼6.5 Myr, provides a good fit to the fine-structure line data. This estimated age of the starburst makes it nearly concurrent with the latest episode of AGN activity, suggesting a link between the growth of the supermassive black hole and stellar population in this source. We do not detect the CO(2–1) line, down to a level twelve times lower than the expected value for star-forming galaxies. This lack of CO line emission is consistent with recent star formation activity if the star-forming molecular gas has low metallicity, is highly fractionated (such that CO is photodissociated throughout much of the clouds), or is chemically very young (such that CO has not yet had time to form). It is also possible, although we argue it ismore » unlikely, that the ensemble of fine-structure lines is emitted from the region heated by the AGN.« less

Authors:
; ; ;  [1];  [2];  [3];  [4]; ;  [5];  [6]
  1. Department of Astronomy, Cornell University, Ithaca, NY 14853 (United States)
  2. Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Avenida Ejército 441, 8370191 Santiago (Chile)
  3. Department of Physics, Winona State University, Winona, MN, 55987 (United States)
  4. California Institute of Technology, Mail Code 301-17, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  5. Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY 14853 (United States)
  6. Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, ON L85-4M1 (Canada)
Publication Date:
OSTI Identifier:
22663804
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 836; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACK HOLES; CARBON; CARBON MONOXIDE; DETECTION; EMISSION; EVOLUTION; FAR INFRARED RADIATION; FINE STRUCTURE; GALAXIES; GALAXY NUCLEI; H2 REGIONS; MASS; METALLICITY; OXYGEN; PHOTONS; RED SHIFT; SPECTRA; STARS

Citation Formats

Lamarche, C., Stacey, G., Riechers, D., Vishwas, A., Brisbin, D., Ferkinhoff, C., Hailey-Dunsheath, S., Nikola, T., Spoon, H., and Sharon, C. E., E-mail: cjl272@cornell.edu. CO-Dark Star Formation and Black Hole Activity in 3C 368 at z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses. United States: N. p., 2017. Web. doi:10.3847/1538-4357/836/1/123.
Lamarche, C., Stacey, G., Riechers, D., Vishwas, A., Brisbin, D., Ferkinhoff, C., Hailey-Dunsheath, S., Nikola, T., Spoon, H., & Sharon, C. E., E-mail: cjl272@cornell.edu. CO-Dark Star Formation and Black Hole Activity in 3C 368 at z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses. United States. doi:10.3847/1538-4357/836/1/123.
Lamarche, C., Stacey, G., Riechers, D., Vishwas, A., Brisbin, D., Ferkinhoff, C., Hailey-Dunsheath, S., Nikola, T., Spoon, H., and Sharon, C. E., E-mail: cjl272@cornell.edu. Fri . "CO-Dark Star Formation and Black Hole Activity in 3C 368 at z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses". United States. doi:10.3847/1538-4357/836/1/123.
@article{osti_22663804,
title = {CO-Dark Star Formation and Black Hole Activity in 3C 368 at z = 1.131: Coeval Growth of Stellar and Supermassive Black Hole Masses},
author = {Lamarche, C. and Stacey, G. and Riechers, D. and Vishwas, A. and Brisbin, D. and Ferkinhoff, C. and Hailey-Dunsheath, S. and Nikola, T. and Spoon, H. and Sharon, C. E., E-mail: cjl272@cornell.edu},
abstractNote = {We present the detection of four far-infrared fine-structure oxygen lines, as well as strong upper limits for the CO(2–1) and [N ii] 205 μ m lines, in 3C 368, a well-studied radio-loud galaxy at z = 1.131. These new oxygen lines, taken in conjunction with previously observed neon and carbon fine-structure lines, suggest a powerful active galactic nucleus (AGN), accompanied by vigorous and extended star formation. A starburst dominated by O8 stars, with an age of ∼6.5 Myr, provides a good fit to the fine-structure line data. This estimated age of the starburst makes it nearly concurrent with the latest episode of AGN activity, suggesting a link between the growth of the supermassive black hole and stellar population in this source. We do not detect the CO(2–1) line, down to a level twelve times lower than the expected value for star-forming galaxies. This lack of CO line emission is consistent with recent star formation activity if the star-forming molecular gas has low metallicity, is highly fractionated (such that CO is photodissociated throughout much of the clouds), or is chemically very young (such that CO has not yet had time to form). It is also possible, although we argue it is unlikely, that the ensemble of fine-structure lines is emitted from the region heated by the AGN.},
doi = {10.3847/1538-4357/836/1/123},
journal = {Astrophysical Journal},
number = 1,
volume = 836,
place = {United States},
year = {Fri Feb 10 00:00:00 EST 2017},
month = {Fri Feb 10 00:00:00 EST 2017}
}
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