Large-scale bipolar outflow from the galactic nucleus of M106.

Zeng, Yuxuan (2023) Large-scale bipolar outflow from the galactic nucleus of M106. Master's Thesis / Essay, Astronomy.

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Abstract

In this study, I investigate the role of energetic outflows from galactic nuclei in shaping galaxy for- mation and evolution, a topic that is still surrounded by uncertainty. My focus is on the nearby disk galaxy M106 (NGC4258), where I present compelling evidence for a large-scale bipolar structure emitting radio and X-ray radiation. By analyzing recently released Low-Frequency Array (LoFAR) survey data and archival observations from the Chandra X-ray Observatory, I aim to gain insights into the underlying physical mechanisms driving this enigmatic structure. Similar to the well-known the eROSITA/Fermi bubbles in our own Galaxy, the M106 bubbles en- close diffuse hot plasma and exhibit prominent radio and X-ray emitting edges. Through mapping the distribution of radio spectral indices and constraining the magnetic field strength, I unveil intrigu- ing details about the inner workings of the structure. My analysis reveals a magnetic field strength varying from approximately 4μG to 13μG, transitioning from the centers to the edges of the M106 bubbles, assuming energy equipartition between cosmic rays and the magnetic field. Furthermore, the diffuse X-ray emission from the bubbles’ spectrum offers additional insights, in- dicating the presence of Ne, Mg, and Si He-α lines. I estimate the thermal energy associated with the entire structure to be approximately 3×1056 erg, likely originating from the low-luminosity ac- tive galactic nucleus (AGN) of the galaxy in the recent

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Fraternali, F.
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	17 Jul 2023 09:40
Last Modified:	17 Jul 2023 09:40
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/30658

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