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About Me
I'm a PhD student at the Astronomical Institute of Charles University, Prague. The research is focussed on the formation and evolution of elliptical galaxies without dark matter and is supervised by Prof.Pavel KroupaLet there be light and there was light, they tried the same with darkness (dark matter) but then came Milgrom 😜
Somewhere someone once said...
"I began with fresh hopes and ambitions, seeking to explore and elucidate the surrounding mysteries. Yet, my fervent journey was abruptly halted by the so-called 'experts' in power. They scrutinized and demanded revisions that aligned with their narrative. I resisted succumbing entirely, making only a few changes. But unbeknownst to me, the essence of my work vanished. Ambitions and explorations were torn away, and now I find myself a cog driven by these 'experts'."
"In a world where the currency of value is often measured in coins and clout, the depth of artistry and scientific marvels sometimes evades the grasp of those solely chasing monetary and authoritative eminence. The richness of these disciplines, like elusive constellations, often remains veiled to the eyes fixated on material worth and dominance. Yet I, a mere mortal, am but a whisper in the symphony of voices, unable to echo a resounding opinion amidst the clamor."
My Work
I work on studies of ETG formation and evolution in Milgromian Dynamics -MOND -Galaxy Dynamics -Ellipticals etc...
Present-day early-type galaxies (ETGs) host old stars without much gas and with a very low star formation activity. Studying the stellar properties of these galaxies is very important for understanding the cosmic history of the Universe. The observations point towards ETGs undergoing very rapid early formation (Cowie et al. 1996; Thomas et al. 2005; Nelan et al. 2005; Recchi et al. 2009; McDermid et al. 2015; Liu et al. 2016). Studies based on elemental abundances of the ETGs constrain them to have formed rapidly on a timescale of ≈ 1 Gyr. Also, studies from stellar population models with observed line indices show that ETGs must have formed the bulk of their stars in a short timescale. Cowie et al. (1996), suggested the name "downsizing" to describe that the less massive galaxies have more extended SFHs compared to the massive ones.
The duration of the formation, i.e. the star-forming timescale (SFT) for ETGs is expressed in Thomas et al. (2005), Recchi et al. (2009) and McDermid et al. (2015) in terms of the downsizing time which is a function of the mass of the galaxy. These downsizing timescales correspond to approximately 0.34 Gyr for a galaxy with a present-day baryonic mass of 1012M⊙, suggesting that it should have formed under a monolithic cloud collapse scenario rather than hierarchical merging which requires longer time-spans (Wuyts et al. 2010; Ricciardelli et al. 2010).
A video showing the collapse of a non-rotating gas cloud in MOND (Eappen et al. 2022a, submitted to MNRAS).
Publications
- The formation of early-type galaxies in Milgromian Dynamics (Eappen et al. 2022a, MNRAS)
- Poster presented at Epoch of Galaxy Quenching 2022.
- Poster presented at Wide-Field Spectroscopy vs Galaxy Formation conference in Tucson, Arizona and LEM workshop in Cfa Boston, USA 2023.
- The formation of compact relic galaxies in Milgromian Dynamics (Eappen et al. 2022b, submitted to MNRAS).
- The structural properties of early-type galaxies (Eappen et al. 2022c, in preparation).