Astrophysical Classics

This category contains 14 posts

How does structure grow? Understanding the Meszaros effect

Explore an astrophysical classic describing the effect of the Universe’s expansion on the seeds of galaxies.

Astrophysical Classics: Cosmochronology with White Dwarfs

In today’s Astrophysical Classic, we hark back to 1987 and the introduction of a new method determining the age of the universe through the use of white dwarf stars.

Life, the Universe and Everything Explained

Why resort to complicated theories that involve mysterious, unknown forces and states of matter? The geocentric model of the Universe nicely explains 1st century C.E. data.

A History: The Superkick Papers

Imagine a spinning skater. She pulls her arms in a little and spins faster. She brings her arms all the way into her chest, and spins really fast, and then bam! she rockets up into the sky. Seven years ago, computer simulations revealed a configuration of two spinning black holes that merged in this way, jumping out of their orbital plane with a velocity of several thousand km/s. Not only is this weird, it’s also important. We know that large galaxies host supermassive black holes at their centers. We also know that galaxies merge, presumably introducing their black holes to one another. If the newly formed black hole were to exit the galaxy entirely, it could carry its accretion disk with it, and be observable as a displaced core.

Science, Still the Endless Frontier

In the final months of World War II, Vannevar Bush, director of the Office of Scientific Research and Development, prepared a report that would forever shape federal support of scientific research.

The Little Star that Could (Teach us about Stellar Astrophysics)

Today we take a look back to 1916, when distances were measured in light years and uncertainties weren’t to be included in publications. The nearly 100-year old discovery of a small star has large implications for our understanding of stellar astrophysics, even today.

Astrophysical Classics: The Observed Relation between Star Formation and Gas in Galaxies

In today’s “astrophysical classic”, we delve into the seminal paper behind the Kennicutt-Schmidt relation, the empirical correlation between the star formation rate and gas density.

Astrophysical Classics: Neutral Hydrogen in the Universe, Part 3

Our special guest astrophysical classics series on Gunn & Peterson 1965 concludes with an examination — and apprehension — of the suspects responsible for reionization.

Astrophysical Classics: Neutral Hydrogen in the Universe, Part 2

Gas in the Universe went from being mostly neutral to mostly ionized as the first galaxies formed, and the signature of this process is imprinted in quasar spectra. The review of the classic paper by Gunn & Peterson continues in this second in the three-part series.

Astrophysical Classics: Neutral Hydrogen in the Universe, Part 1

This guest post, the first in a three-part series, reviews the classic article by Gunn & Peterson (1965). This paper proposed several fundamental ideas in cosmology, including using distant quasars as “flashlights” to observe the diffuse gas between galaxies.

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