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Title: IONIZED NITROGEN AT HIGH REDSHIFT

Abstract

We present secure [N II]{sub 205{mu}m} detections in two millimeter-bright, strongly lensed objects at high redshift, APM 08279+5255 (z = 3.911) and MM 18423+5938 (z = 3.930), using the IRAM Plateau de Bure Interferometer. Due to its ionization energy [N II]{sub 205{mu}m} is a good tracer of the ionized gas phase in the interstellar medium. The measured fluxes are S([N II]{sub 205{mu}m}) = (4.8 {+-} 0.8) Jy km s{sup -1} and (7.4 {+-} 0.5) Jy km s{sup -1}, respectively, yielding line luminosities of L([N II]{sub 205{mu}m}) = (1.8 {+-} 0.3) Multiplication-Sign 10{sup 9} {mu}{sup -1} L{sub Sun} for APM 08279+5255 and L([N II]{sub 205{mu}m}) = (2.8 {+-} 0.2) Multiplication-Sign 10{sup 9} {mu}{sup -1} L{sub Sun} for MM 18423+5938. Our high-resolution map of the [N II]{sub 205{mu}m} and 1 mm continuum emission in MM 18423+5938 clearly resolves an Einstein ring in this source and reveals a velocity gradient in the dynamics of the ionized gas. A comparison of these maps with high-resolution EVLA CO observations enables us to perform the first spatially resolved study of the dust continuum-to-molecular gas surface brightness ({Sigma}{sub FIR}{proportional_to}{Sigma}{sup N}{sub CO}, which can be interpreted as the star formation law) in a high-redshift object. We find amore » steep relation (N = 1.4 {+-} 0.2), consistent with a starbursting environment. We measure a [N II]{sub 205{mu}m}/FIR luminosity ratio in APM 08279+5255 and MM 18423+5938 of 9.0 Multiplication-Sign 10{sup -6} and 5.8 Multiplication-Sign 10{sup -6}, respectively. This is in agreement with the decrease of the [N II]{sub 205{mu}m}/FIR ratio at high FIR luminosities observed in local galaxies.« less

Authors:
;  [1]; ;  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12]
  1. Max-Planck Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany)
  2. IRAM, 300 rue de la piscine, F-38406 Saint-Martin d'Heres (France)
  3. Argelander Institute for Astronomy, University of Bonn, Auf dem Huegel 71, D-53121 Bonn (Germany)
  4. NRAO, Pete V. Domenici Array Science Center, P.O. Box O, Socorro, NM 87801 (United States)
  5. Laboratoire d'Astrophysique de Marseille, Observatoire d'Astronomie Marseille-Provence, BP 8, F-13376 Marseille (France)
  6. Observatoire de Paris, CNRS, 61 Av. de l'Observatoire, F-75014 Paris (France)
  7. INAF-Osservatorio Astronomico di Roma, via di Frascati 33, I-00040 Monte Porzio Catone (Italy)
  8. Institut d'Astrophysique de Paris, UPMC and CNRS, 98bis Bld. Arago, F-75014 Paris (France)
  9. CRAL, Observatoire de Lyon, Universite Lyon 1, 9 Avenue Ch. Andre, F-69561 Saint Genis Laval Cedex (France)
  10. Astronomy Department, Caltech, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
  11. Canada-France-Hawaii Telescope Corporation, HI 96743 (United States)
  12. Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, D-53121 Bonn (Germany)
Publication Date:
OSTI Identifier:
22037125
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 752; 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; ASTRONOMY; ASTROPHYSICS; BRIGHTNESS; CARBON MONOXIDE; COMPARATIVE EVALUATIONS; COSMIC DUST; DETECTION; FAR INFRARED RADIATION; INTERFEROMETERS; IONIZATION; LUMINOSITY; MILKY WAY; NITROGEN IONS; PHOTON EMISSION; QUASARS; RED SHIFT; RESOLUTION; STARS

Citation Formats

Decarli, R., Walter, F., Neri, R., Cox, P., Bertoldi, F., Carilli, C., Kneib, J. P., Lestrade, J. F., Maiolino, R., Omont, A., Richard, J., Riechers, D., Thanjavur, K., and Weiss, A., E-mail: decarli@mpia.de. IONIZED NITROGEN AT HIGH REDSHIFT. United States: N. p., 2012. Web. doi:10.1088/0004-637X/752/1/2.
Decarli, R., Walter, F., Neri, R., Cox, P., Bertoldi, F., Carilli, C., Kneib, J. P., Lestrade, J. F., Maiolino, R., Omont, A., Richard, J., Riechers, D., Thanjavur, K., & Weiss, A., E-mail: decarli@mpia.de. IONIZED NITROGEN AT HIGH REDSHIFT. United States. doi:10.1088/0004-637X/752/1/2.
Decarli, R., Walter, F., Neri, R., Cox, P., Bertoldi, F., Carilli, C., Kneib, J. P., Lestrade, J. F., Maiolino, R., Omont, A., Richard, J., Riechers, D., Thanjavur, K., and Weiss, A., E-mail: decarli@mpia.de. Sun . "IONIZED NITROGEN AT HIGH REDSHIFT". United States. doi:10.1088/0004-637X/752/1/2.
@article{osti_22037125,
title = {IONIZED NITROGEN AT HIGH REDSHIFT},
author = {Decarli, R. and Walter, F. and Neri, R. and Cox, P. and Bertoldi, F. and Carilli, C. and Kneib, J. P. and Lestrade, J. F. and Maiolino, R. and Omont, A. and Richard, J. and Riechers, D. and Thanjavur, K. and Weiss, A., E-mail: decarli@mpia.de},
abstractNote = {We present secure [N II]{sub 205{mu}m} detections in two millimeter-bright, strongly lensed objects at high redshift, APM 08279+5255 (z = 3.911) and MM 18423+5938 (z = 3.930), using the IRAM Plateau de Bure Interferometer. Due to its ionization energy [N II]{sub 205{mu}m} is a good tracer of the ionized gas phase in the interstellar medium. The measured fluxes are S([N II]{sub 205{mu}m}) = (4.8 {+-} 0.8) Jy km s{sup -1} and (7.4 {+-} 0.5) Jy km s{sup -1}, respectively, yielding line luminosities of L([N II]{sub 205{mu}m}) = (1.8 {+-} 0.3) Multiplication-Sign 10{sup 9} {mu}{sup -1} L{sub Sun} for APM 08279+5255 and L([N II]{sub 205{mu}m}) = (2.8 {+-} 0.2) Multiplication-Sign 10{sup 9} {mu}{sup -1} L{sub Sun} for MM 18423+5938. Our high-resolution map of the [N II]{sub 205{mu}m} and 1 mm continuum emission in MM 18423+5938 clearly resolves an Einstein ring in this source and reveals a velocity gradient in the dynamics of the ionized gas. A comparison of these maps with high-resolution EVLA CO observations enables us to perform the first spatially resolved study of the dust continuum-to-molecular gas surface brightness ({Sigma}{sub FIR}{proportional_to}{Sigma}{sup N}{sub CO}, which can be interpreted as the star formation law) in a high-redshift object. We find a steep relation (N = 1.4 {+-} 0.2), consistent with a starbursting environment. We measure a [N II]{sub 205{mu}m}/FIR luminosity ratio in APM 08279+5255 and MM 18423+5938 of 9.0 Multiplication-Sign 10{sup -6} and 5.8 Multiplication-Sign 10{sup -6}, respectively. This is in agreement with the decrease of the [N II]{sub 205{mu}m}/FIR ratio at high FIR luminosities observed in local galaxies.},
doi = {10.1088/0004-637X/752/1/2},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}