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A comparison of the velocity fields of the warm ionized gas in massive elliptical galaxies in CALIFA and in cosmological zoom-in simulations

Ein Vergleich der Geschwindigkeitsfelder des warmen, ionisierten Gases in massereichen elliptischen Galaxien in CALIFA und in kosmologischen Zoom-In-Simulationen
Authors: Florian, Jan;

A comparison of the velocity fields of the warm ionized gas in massive elliptical galaxies in CALIFA and in cosmological zoom-in simulations

Abstract

Wir analysieren die Gaskinematik massereicher Galaxien frühen Typs in Simulationen und Beobachtungen in Bezug auf die Auswirkung von AGN-Feedback auf gewisse, quantitative Irregularitätsparameter. Wir beziehen unsere Beobachtungsdaten von der CALIFA-Survey und un- sere simulierten Daten wurden anhand des Codes SPHGal produziert. Wir selektieren die Objekte, die momentan durch AGN-Feedback bee- influsst werden, indem wir WHAN-Analyse durchführen, damit wir sie vergleichen können. Mit unseren Simulationsdaten haben wir Zugang zu zwei unterschiedlichen Datensätzen, wobei der einzige Unterschied zwischen den beiden die vorhandene oder nichtvorhandene Implementa- tion von AGN-Feedback ist. Dies erlaubt es uns, die Auswirkungen von AGN-Feedback klar zu isolieren und diese strikte Trennung, gemeinsam mit der Möglichkeit, die zeitliche Entwickling der simulierten Galaxien zu erforschen, ist mit den Beobachtungsdaten nicht möglich. Deswegen ver- wenden wir die Simulationsdaten als Orientierungshilfe für die Beobach- tungsdaten. Wir stellen fest, dass AGN-Feedback tatsächlich die Werte der Irregularitätsparameter in den Simulationen erhöht, aber dass andere Phänomene wie z.B. Merger dies auch bewirken können. Desweiteren gibt eine Galaxie, die irgendwann in ihrer Vergangenheit AGN-Feedback ausgesetzt wurde, in der Gegenwart nicht unbedingt Anzeichen darauf. Insgesamt können hohe Werte der Irregularitätsparameter Anzeichen für AGN-Feedback sein, sind dies aber nicht notwendigermaßen.

We analyze the gas kinematics of massive, early-type galaxies, in sim- ulations and observations, with respect to the effect of AGN feedback on certain quantitative irregularity parameters. Our observational data sample is drawn from the integral-field survey CALIFA, and our simu- lated data sample is based upon galaxies produced via the code SPHGal. We select objects (observed and simulated) which are currently affected by AGN feedback by means of WHAN analysis in order to compare them. With our simulated data, we have access to two separate simula- tion runs, the only difference between the two being the implementation of AGN feedback in one, but not the other, which allows us to cleanly isolate AGN feedback’s effects. This separation, along with the ability to explore a galaxy’s development over time, is not possible with our observational data, and so we use the simulations as a guide to the ob- servations. We find that AGN feedback does increase the value of the irregularity parameters in our simulations, but that other phenomena, such as galactic mergers, can increase them as well. Furthermore, a galaxy which was affected by AGN feedback at some point in its past does not necessarily indicate this in the present. In all, high values for irregularity parameters may be but are not necessarily caused by AGN feedback.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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