The Connection Between Quasars and Starbursts

• Antragsteller: Professor Dr. Frank Bertoldi; Dr. Fabian Walter
• Fachliche Zuordnung: Astrophysik und Astronomie
• Förderung: Förderung von 2005 bis 2012
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5449740

• Erstellungsjahr: 2012

Zusammenfassung der Projektergebnisse

We were able to achieve the goals that we originally set. This included the detailed studies of the interstellar medium in high-redshift quasars by using state-of-the art observations obtained at various radio/millimeter facilities, including the GBT, Effelsberg, (E)VLA and the IRAM Plateau de Bure interferometer. Key results are the first detection of high-density tracer molecules, the first spatially resolved imaging of the molecular ISM of high-redshift quasar hosts, the first studies of the J=1 CO transition (the best tracer for the total molecular gas mass) in a sample of high-redshift quasars, and constraining high–z QSO SEDs. Lately, we have extended this study to ionized carbon, which we have proven to be a powerful tracer of the star-forming interstellar medium. We made strong use of the upgraded IRAM PdBI interferometer and we used the newly available broad band-width receivers at the PdBI and the EVLA to search for molecular gas emission in objects that have so far have escaped the detection of gas. The studies funded through our SPP grant have provided crucial insights on the relation between the central AGN/QSO activity and star formation in the host galaxies.

Projektbezogene Publikationen (Auswahl)

• 2009, A&A, 496, 45: New CO detections of lensed submillimetre galaxies in A2218: probing molecular gas in the LIRG regime at high redshift
  Knudsen, K. K., et al.
  
• 2009, ApJ, 703, 1338: Imaging Atomic and Highly Excited Molecular Gas in a z = 6.42 Quasar Host Galaxy ...
  Riechers, D. A., et al.
  
• 2010, A&A, 518, L34: Herschel-PACS FIR photometry of two z ≥ 4 quasars
  Leipski, C., et al.
  
• 2010, ApJ, 709, 210: Physical Properties and Morphology of a Newly Identified Compact z = 4.04 Lensed Submillimeter Galaxy in Abell 2218
  Knudsen, K. K., et al.
  
• 2010, ApJ, 711, 757: CO J = 6-5 in Arp 220: Strong Effects of Dust on High-J CO Lines
  Papadopoulos, P., et al.
  
• 2010, ApJ, 714, 699: Molecular Gas in z ∼ 6 Quasar Host Galaxies
  Wang, R., et al.
  
• 2010, ApJ, 714, 834: Ionization Near Zones Associated with Quasars at z ∼ 6
  Carilli, C. L., et al.
  
• 2010, ApJ, 715, 775: CO Spectral Line Energy Distributions of Infrared- Luminous Galaxies and Active Galactic Nuclei
  Papadopoulos, P., et al.
  
• 2010, ApJ, 717, 1037: Deviations from the Schmidt-Kennicutt Relations During Early Galaxy Evolution
  Papadopoulos, P., et al.
  
• 2010, ApJ, 719, 483: A LABOCA Survey of the Extended Chandra Deep Field South – Submillimeter Properties of Near-infrared Selected Galaxies
  Greve, T. R., et al.
  
• 2010, ApJ, 720, 226: A Cosmic-ray-dominated Interstellar Medium in Ultra Luminous Infrared Galaxies: New Initial Conditions for Star Formation
  Papadopoulos, P.
  
• 2011, AJ, 142, 101: Far-infrared and Molecular CO Emission from the Host Galaxies of Faint Quasars at z ∼ 6
  Wang, Ran, et al.
  
• 2011, ApJ, 726, 50: Dense Molecular Gas Excitation at High Redshift: Detection of HCO+(J = 4-3) Emission in the Cloverleaf Quasar
  Riechers, D. A., et al.
  
• 2011, ApJ, 739, 56: Evidence for Non-evolving Fe II/Mg II Ratios in Rapidly Accreting z ∼ 6 QSOs
  De Rosa, G., et al.
  
• 2011, ApJ, 739, L30: A Molecular Einstein Ring Toward the z = 3.93 Submillimeter Galaxy MM18423+5938
  Lestrade, Jean-Francois, et al.
  
• 2011, ApJ, 739, L31: Extended Cold Molecular Gas Reservoirs in z ≃ 3.4 Submillimeter Galaxies
  Riechers, D. A., et al.
  
• 2011, ApJ, 739, L34: CO (2-1) Line Emission in z = 6 Quasar Host Galaxies
  Wang, Ran, et al.
  
• 2011, ApJ, 741, L38: Water Vapor Emission Reveals a Highly Obscured, Star-forming Nuclear Region in the QSO Host Galaxy APM 08279+5255 at z = 3.9
  van der Werf, Paul P., et al.