Extragalactic Archeology: Linking Active Galactic Nuclei to Dark Matter Halos over Cosmic Time
Final Report Abstract
The research project aimed for providing the evolution of the full distribution of the number of AGN as a function of halo mass in the last ∼11 Gyr with three independent measurements. In addition, the observed AGN clustering properties and halo occupation distribution should be compared to cosmological simulation to discriminate between currently favored AGN triggering scenarios. As found previously at other redshifts, our HOD model for local and z ∼ 0.6 type I AGN indicates that above DMH masses of Mh ∼ 1012 h−1 M⊙ the duty cycle of AGN in satellite galaxies decreases with increasing halo mass, in that the slope of the HOD is shallower for AGN than for galaxies. This trend tends to weaken with redshift, i.e., the discrepancy between the AGN and galaxy HOD is smaller at higher redshift than in the local Universe. Only in the local sample, we could also compare in an unbiased way the clustering properties between type I and II AGN. Local type II AGN have an HOD that is very similar to that of galaxies. The average number of type II AGN in satellite galaxies increases approximately proportionally to DMH mass, as is observed for galaxies. Thus, the ratio of type I to II AGN should decrease with DMH mass. These differences in the clustering properties of type I and type II AGN are at odds with a simple orientation-based AGN unification scheme. Current state-of-the-art hydrodynamical simulations are able to well reproduce not only the galaxy luminosity function but also the observed HOD of galaxies very well. However, even though the AGN luminosity function is well represented, the distribution in the observed parameter plane (e.g. black hole mass vs. accretion ratio) as well as the AGN clustering properties and the HOD differs significantly from the observed ones. This project shows how much more constraining power is given to these simulation if they do not only have to reproduce luminosity function but clustering and HOD parameter as well. During this project, a student wrote his Diploma thesis on correlation functions and a PhD student was co-supervised on clustering measurements and HOD modeling using cosmological simulations. The time plan for HETDEX slipped significantly. The CCDs did totally not perform as expected and caused a major delay of 3 years. Thus, instead of using the HETDEX data as a third independent AGN clustering and HOD measurement, we used the SDSS CMASS galaxies and ROSAT AGN at z ∼ 0.6 instead. - For different reasons the auto-correlation functions of the 2MASS and CMASS galaxy sample turned out to be significantly more complicated and time-consuming than expected. This could have been not forseen unless digging already very deep into the data.
Publications
- The Spatial Clustering of ROSAT All-Sky Survey Active Galactic Nuclei. IV. More Massive Black Holes Reside in More Massive Dark Matter Halos; 2015, ApJ, 815, 21
Krumpe, Mirko; Miyaji, Takamitsu; Husemann, Bernd; Fanidakis, Nikos; Coil, Alison L.; Aceves, Hector
(See online at https://doi.org/10.1088/0004-637X/815/1/21) - The Close AGN Reference Survey (CARS). What is causing Mrk 1018’s return to the shadows after 30 years? 2016, A&A, 593L, 9
Husemann, B.; Urrutia, T.; Tremblay, G. R.; Krumpe, M.; Dexter, J.; Busch, G.; Combes, F.; Croom, S. M.; Davis, T. A.; Eckart, A.; et al.
(See online at https://doi.org/10.1051/0004-6361/201629245) - High excitation emission line nebula associated with an ultra-luminous X-ray source at z = 0.027 in the AKARI North Ecliptic Pole Deep Field; 2017, A&A, 604, 14
Díaz Tello, J.; Miyaji, T.; Ishigaki, T.; Krumpe, M.; Ueda, Y.; Brunner, H.; Goto, T.; Hanami, H.; Toba, Y.
(See online at https://doi.org/10.1051/0004-6361/201730611) - The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability; 2017, A&A, 607L, 9
Krumpe, M.; Husemann, B.; Tremblay, G. R.; Urrutia, T.; Powell, M.; Davis, T. A.; Scharwächter, J.; Dexter, J.; Busch, G.; Combes, F.; et al.
(See online at https://doi.org/10.1051/0004-6361/201731967) - Spatial clustering and halo occupation distribution modelling of local AGN via cross-correlation measurements with 2MASS galaxies; 2018, MNRAS, 474, 1773
Krumpe, Mirko; Miyaji, Takamitsu; Coil, Alison L.; Aceves, Hector
(See online at https://doi.org/10.1093/mnras/stx2705) - The Close AGN Reference Survey (CARS). No evidence of galaxy-scale hot outflows in two nearby AGN; 2018, A&A, 618, 27
Powell, M. C.; Husemann, B.; Tremblay, G. R.; Krumpe, M.; Urrutia, T.; Baum, S. A.; Busch, G.; Combes, F.; Croom, S. M.; Davis, T. A.; et al.
(See online at https://doi.org/10.1051/0004-6361/201833424)
