Conditions for Star Formation in Nearby AGN and QSO Hosts

  • Our Team

  • Prof. Andreas Eckart
    (PI, PH1)
  • PD Dr. Silke Britzen (PI, MPIfR)
  • Prof. Anton Zensus (MPIfR)
  • Gerold Busch (PH1)
  • Nastaran Fazeli (PH1)
  • S. Elaheh Hosseini (PH1/MPIfR)
  • Marzieh Parsa (PH1/MPIfR)
  • Dr. Nadeen Sabha (PH1)
  • Dr. Banafsheh Shahzamanian (PH1)
  • Dr. Christian Straubmeier (PH1)
  • Dr. Monica Valencia-Schneider (PH1)
  • Dr. Gunther Witzel (UCLA)
  • Michal Zajacek (MPIfR/PH1)

​A short overview

This project aims at understanding the conditions for star formation in active galaxies and the interplay between the AGN nucleus, and the hosts of intermediate redshift (z < 0.1) systems to bridge the gap towards marginally resolved high redshift AGN hosts. At z < 0.1 the frequency of more powerful AGN is higher than locally but at the same time the sub-kpc resolution (down to a few 10 pc) allows us to clearly resolve dynamical patterns and nuclear structures that determine the conditions for star formation. We use results from Milky Way and local galaxies and supply results that are needed to understand higher redshift hosts.

So far, successful work has been done on all subtopics of A2. The distribution and kinematics of molecular gas and star formation in Nuclei of Galaxies (NUGA) could be studied on the basis of new high-resolution data. Nearby QSO spectra in the Infrared together with imaging data has revealed the interplay between nuclear star formation and the non-thermal nucleus. Jet induced star formation was studied in one CenA field and an X-shaped radio galaxy. Furthermore, chemistry and excitation aspects of a few NUGA sources were observed with the HIFI instrument onboard the Herschel space telescope, complementing Plateau de Bure Interferometer-, Near-Infrared-, and Radio data.

Project A2 closely interacts with A1 on high-z QSOs, A3 especially on excitation properties of local galaxies, C1 on excitation of the ISM, and dynamics of astrophysical disks. The properties of evolving galaxies in spiral rich clusters and the distribution of star formation and star formation efficiencies within such systems can be compared to the quantities predicted for the early formation of stars and galaxies in C4. Project A2 provides observational input and is supported (by B1, B2, B3) in the analysis of chemical networks links to non-thermal activities in AGN. The larger scale Galactic Center information provided by project A5 in part serves as a template for the LLAGN hosts. Massive stars as A2 traces them through radio continuum radiation and IR detected HII regions as well as through diagnostic NIR line ratios rely on data from project A6. Here project A2 also relies on diagnostic tools provided for PDR and Shocks by C1 and C2.

Selected Publications

In 2018
Mossoux, Enmanuelle; Eckart, Andreas; The X-ray footprint of the circumnuclear disc; 2018, MNRAS 474, 3787;

Eckart, A.; Parsa, M.; Mossoux, E.; Shahzamanian, B.; Zajacek, M.; Hosseini, E.; Subroweit, M.; Peissker, F.; Sabha, N.; Valencia-S., M.; and 4 coauthors; Light and shadow in the Galactic Center - On the detection of the relativistic periastron shift of star S2 in the Galactic Center; 2018 arXiv180601096E

Markakis, K.; Eckart, A.; Castro, N.; Sánchez-Monge, Á.; Labadie, L.; Nishiyama, S.; Britzen, S.; Zensus, J. A.; High-resolution Observations of Cen A: Yellow and Red Supergiants in a Region of Jet-induced Star Formation?; 2018, ApJ 852, 63

In 2017
Eckart, Andreas; Hüttemann, Andreas; Kiefer, Claus; Britzen, Silke; Zajaček, Michal; Lämmerzahl, Claus; Stöckler, Manfred; Valencia-S, Monica; Karas, Vladimir; García-Marín, Macarena; The Milky Way's Supermassive Black Hole: How Good a Case Is It?; 2017, FoPh 47, 553

Gravity Collaboration; Garcia Lopez, R.; Perraut, K.; Caratti O Garatti, A.; Lazareff, B.; Sanchez-Bermudez, J.; Benisty, M.; Dougados, C.; Labadie, L.; Brandner, W.; and 64 coauthors ; The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution; 2017, A&A 608, 78;

Krumpe, M.; Husemann, B.; Tremblay, G. R.; Urrutia, T.; Powell, M.; Davis, T. A.; Scharwächter, J.; Dexter, J.; Busch, G.; Combes, F.; and 5 coauthors; The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability; 2017, A&A 607, L9;

Parsa, M.; Eckart, A.; Shahzamanian, B.; Karas, V.; Zajaček, M.; Zensus, J. A.; Straubmeier, C.; Investigating the Relativistic Motion of the Stars Near the Supermassive Black Hole in the Galactic Center; 2017, ApJ 845, 22;

Moser, Lydia; Sánchez-Monge, Álvaro; Eckart, Andreas; Requena-Torres, Miguel A.; García-Marin, Macarena; Kunneriath, Devaky; Zensus, Anton; Britzen, Silke; Sabha, Nadeen; Shahzamanian, Banafsheh; and 2 coauthors; Approaching hell's kitchen: Molecular daredevil clouds in the vicinity of Sagittarius A*; 2017, A&A 603, 68;

Zajacek, M.; Eckart, A.; Shahzamanian, B.; Polarimetry Narrows Down the Possibilities for the Dusty S-Cluster Object (DSO/G2) in the Galactic Centre; 2017, Obs 137, 112;

Zajaček, Michal; Britzen, Silke; Eckart, Andreas; Shahzamanian, Banafsheh; Busch, Gerold; Karas, Vladimír; Parsa, Marzieh; Peissker, Florian; Dovčiak, Michal; Subroweit, Matthias; and 2 coauthors; Nature of the Galactic centre NIR-excess sources. I. What can we learn from the continuum observations of the DSO/G2 source?; 2017, A&A 602, 121;

Busch, Gerold; Eckart, Andreas; Valencia-S., Mónica; Fazeli, Nastaran; Scharwächter, Julia; Combes, Françoise; García-Burillo, Santiago; Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI; 2017, A&A 598, 55;

In 2016
Shahzamanian, B., Eckart, A., Zajacek, M., Valencia-S., Sabha, N., et al., Polarized near-infrared light of the Dusty S-cluster Object (DSO/G2) at the Galactic center, 2016, A&A 593, 131

Borkar, A., Eckart, A., Straubmeier, C., et al., Monitoring the Galactic Centre with the Australia Telescope Compact Array, 2016, MNRAS 458, 2336

Garcia-Burillo, S., Combes, F., ... Eckart, A., et al., ALMA Resolves the Torus of NGC 1068: Continuum and Molecular Line Emission, 2016, ApJL 823, 12

Busch, G., Fazeli, N., Eckart, A., Valencia-S., M., et al., A low-luminosity type-1 QSO sample. V. Overluminous host spheroids and their excitation mechanisms, 2016, A&A 587, 138

Moser, L., ..., Busch, G., ..., Eckart, A., et al., A low-luminosity type-1 QSO sample . IV. Molecular gas contents and conditions of star formation in three nearby Seyfert galaxies, 2016, A&A 587, 137

Zajacek, M., Eckart, A., ..., Shahzamanian, B., Sabha, N., ..., Valencia-S., M., Effect of an isotropic outflow from the Galactic Centre on the bow-shock evolution along the orbit, 2016, MNRAS 455, 1257

In 2015
Valencia-S., M., Eckart, A., Zajacek, M., Peissker, F., et al., Monitoring the Dusty S-cluster Object (DSO/G2) on its Orbit toward the Galactic Center Black Hole, 2015, ApJ 800, 125

Rashed, Y.E., Eckart, A., Valencia-S., M., et al., Line and continuum variability in active galaxies, 2015, MNRAS 454, 2918

Shahzamanian, B., Eckart, A., Valencia-S., M., Witzel, G., et al., Polarized light from Sagittarius A* in the near-infrared Ks-band, 2015, A&A 576, 20

Smajic, S., Moser, L., Eckart, A., Busch, G., et al., The nuclear gas disk of NGC 1566 dissected by SINFONI and ALMA, 2015, A&A 583, 104

Tremou, E., ..., Eckart, A., Valencia-S., M., et al., A low-luminosity type-1 QSO sample. III. Optical spectroscopic properties and activity classification, 2015, A&A 580, 113

Vitale, M., Fuhrmann, L., Garcia-Marin, M., Eckart, A., et al., Galaxy evolution across the optical emission-line diagnostic diagrams?, 2015, A&A 573, 93

Busch, G., Smajic, S., Scharwächter, J., Eckart, A., Valencia-S., M., et al., A low-luminosity type-1 QSO sample. II. Tracing circumnuclear star formation in HE 1029-1831 with SINFONI, 2015, A&A 575, 128

In 2014
Smajic, S., Moser, L., Eckart, A., ..., Combes, ..., Garcia-Burillo, et al., ALMA-backed NIR high resolution integral field spectroscopy of the NUGA Galaxy NGC1433, 2014, A&A 567, 119

Jalali, B., ..., Eckart, A., ..., Sabha, N., et al., Star formation in the vicinity of nuclear black holes: young stellar objects close to Sgr A*, 2014, MNRAS 444, 1205

​Combes, F.; Garcia-Burillo, S.; Casasola, V.; ... Eckart, A. et al., ALMA reveals the feeding of the Seyfert 1 nucleus in NGC 1566, 2014, A&A 565, 97

Zajacek, M., Karas, V., Eckart, A., Dust-enshrouded star near supermassive black hole: predictions for high-eccentricity passages near low-luminosity galactic nuclei, 2014, A&A 565, 17

Busch, G.; Zuther, J.; Valencia-S., M.; Moser, L.; Fischer, S.; Eckart, A.; et al., A low-luminosity type-1 QSO sample: I. Overluminous host spheroidals or undermassive black holes?; 2014, A&A 561, 140

In 2013
Bremer, M.; Scharwächter, J.; Eckart, A.; Valencia-S., M.; Zuther, J.; Combes, F.; et al, What produces the extended LINER-type emission in the NUGA galaxy, NGC 5850?, 2013, A&A 558, 34

Rashed, Y. E.; Zuther, J.; Eckart, A. ; Busch, G.; Valencia-S., M.; Vitale, M.; Britzen, S. ; Muxlow, T., High-resolution observations of SDSS J080800.99+483807.7 in the optical and radio domains. A possible example of jet-triggered star formation, 2013, A&A 558, 5

Eckart, A., Britzen, S., Horrobin, M., Zamaninasab, M., et al., The Galactic Center as a Paradigme for Low Luminosity Nuclei; refereed; in press; Bad Honnef Proc; ,2013, arXiv13112743E

Combes, F.; Garcia-Burillo, S.; Casasola, V.; ... Eckart, A. et al., ALMA observations of feeding and feedback in nearby Seyfert galaxies: an AGN-driven outflow in NGC 1433, 2013, A&A 558, 124

Eckart, A.; Muzic, K.; Yazici, S.; Sabha, N.; Shahzamanian, B.; Witzel, G.; et al., Near-infrared proper motions and spectroscopy of infrared excess sources at the Galactic center, 2013, A&A, 551, 18

In 2012
Witzel, G.; Eckart, A.; Bremer, M.; Zamaninasab, M.; Shahzamanian, B.; et al., Source-intrinsic Near-infrared Properties of SgrA*: Total Intensity Measurements; 2012, ApJS 203, 18

Vitale, M.; Zuther, J.; García-Marin, M.; Eckart, A.; Bremer, M.; Valencia-S., M.; Zensus, A; Classifying radio emitters from the Sloan Digital Sky Survey. Spectroscopy and diagnostics, 2012, A&A 546, 17

Sabha, N.; Eckart, A.; Merritt, D.; et al., The S-star cluster at the center of the Milky Way. On the nature of diffuse NIR emission in the inner tenth of a parsec, 2012, A&A 545, 70

Valencia-S., M.; Zuther, J.; Eckart, A.; García-Marín, M.; Iserlohe, C.; Wright Is IRAS 01072+4954 a True-Seyfert 2?. Hints from near-infrared integral field spectroscopy, 2012 A&A 544, 129

Koenig, S.; Garcia-Marin, M.; Eckart, A.; Downes, D.; Scharwächter,J.;The Arp 220 Merger on kpc Scales, 2012 ApJ 754, 58