April 24, 2018

A Deeper Look at the New Milky Way Satellites

Current deep, wide-field sky surveys, such as the Dark Energy Survey (DES) and Pan-STARRS, have discovered new faint satellites around the Milky Way. As these dwarf galaxies are typically very faint and among the most dark-matter-dominated objects, their physical properties offer a unique opportunity to study the physics of dark matter and galaxy formation on the smallest scales. This project focuses on the Magellan/Megacam stellar photometry of four recently discovered Milky Way Satellites to have a deep observational understanding of these new objects (e.g., their star formation history, structural properties, signs of tidal disturbance).

November 10, 2017

The Illustris Simulation: Supermassive Black Hole - Galaxy Connection Beyond the Bulge

 We study the spiral arm morphology of a sample of the local spiral galaxies in the Illustris simulation and explore the supermassive black hole− galaxy connection beyond the bulge (e.g., spiral arm pitch angle, total stellar mass, dark matter mass, and total halo mass), finding good agreement with other theoretical studies and observational constraints. It is important to study the properties of supermassive black holes and their host galaxies through both observations and simulations and compare their results in order to understand their physics and formative histories.We find that Illustris prediction for supermassive black hole mass relative to pitch angle is in rather good agreement with observations and that barred and non-barred galaxies follow similar scaling relations. Our work shows that Illustris presents very tight correlations between supermassive black hole mass and large-scale properties of the host galaxy, not only for early-type galaxies but also low-mass, blue and star-forming galaxies. These tight relations beyond the bulge suggest that halo properties determine those of a disc galaxy and its supermassive black hole.

April 21, 2017

Search for Intermediate Mass Black Holes

This work is the first stage of our campaign to search for intermediate-mass black holes (IMBHs) in low-luminosity active galactic nuclei (LLAGN) and dwarf galaxies. The discovery of elusive black hole population is the key to understand the origin of supermassive black holes and early galaxy formation. In this work, we established a robust method to predict central black hole masses in the regime where their spheres-of-(gravitational influence) cannot be spatially resolved. We demonstrated – for the first time – that several popular black hole scaling relations predict consistent BH masses in low mass regime.

November 30, 2016

The Peculiar Ringed Galaxy: PGC 1000714

This paper reports a discovery of an extremely rare galaxy with a unique circular structure that has never been identified before. This work has provided the first description of a double ringed elliptical galaxy, that stretches the boundaries of our understanding of how galaxies form and evolve. There is no known mechanism that explains the presence of an inner ring in such peculiar systems, so this discovery adds to the wealth of information that is needed to be explained with the theories. 

October 17, 2016

The Local Supermassive Black Hole Mass Function

This paper is on a census of supermassive black holes in the nearby Universe, estimating their masses to determine how they grow and evolve over time. We provided important constraints on the distribution of the local black hole populations, especially in the low mass regime, through imaging data only. 

June 30, 2017

Dissertation: Super-Massive Black Hole Scaling Relations and Peculiar Ringed Galaxies

This dissertation aims to improve the theory of galaxy formation through two independent areas of investigation: 1) super-massive black hole (BH) scaling relations and 2) formation mechanisms of peculiar rings.

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© 2017 by Burçin Mutlu-Pakdil