8 min read
Cosmic whack-a-mole
The fine-tuning problem encountered by dark matter models that I talked about last time is generic. The knee-jerk reaction of most workers seems to
Tag : Galaxy Formation
8 min read
13 min read
Two Hypotheses
OK, basic review is over. Shit’s gonna get real. Here I give a short recounting of the primary reason I came to doubt the dark matter paradigm.
6 min read
Galaxy Formation – a few basics
Galaxies are gravitationally bound condensations of stars and gas in a mostly empty, expanding universe. The tens of billions of solar masses of
8 min read
Primer on Galaxy Properties
When we look up at the sky, we see stars. Stars are the building blocks of galaxies; we can see the stellar disk of the galaxy in which we live as
Common ground
In order to agree on an interpretation, we first have to agree on the facts. Even when we agree on the facts, the available set of facts may admit
9 min read
Galaxy models in compressed halos
The last post was basically an introduction to this one, which is about the recent work of Pengfei Li. In order to test a theory, we need to
10 min read
What should we expect for the radial acceleration relation?
In the previous post, I related some of the history of the Radial Acceleration Relation (henceforth RAR). Here I’ll discuss some of my efforts to
Sins of Omission
There’s a paper recently published in Nature Astronomy by Moreno et al, which you can find on the arXiv here. The title is Galaxies lacking dark
10 min read
What JWST will see
Big galaxies at high redshift! That’s my prediction, anyway. A little context first. New Year, New Telescope First, JWST finally launched. This has
10 min read
What JWST will see
Big galaxies at high redshift! That’s my prediction, anyway. A little context first. New Year, New Telescope First, JWST finally launched. This has
1 min read
FOCASing on the Metallicity Gradient of an Extremely Metal-poor Galaxy
Title: Subaru/FOCAS IFU revealed the metallicity gradient of a local extremely metal-poor galaxyAuthors: Yuri Kashiwagi, Akio K. Inoue, Yuki Isobe,
19 min read
Galaxy Stellar and Halo Masses: tension between abundance matching and kinematics
Mass is a basic quantity. How much stuff does an astronomical object contain? For a galaxy, mass can mean many different things: that of its stars,
2 min read
Scientists Found a Lookalike of Our Own Galaxy Deep in Cosmic Time
Astronomers have spotted a galaxy located 12 billion light years from Earth that unexpectedly looks like a younger version of our own galaxy, the
2 min read
Scientists Found a Lookalike of Our Own Galaxy Deep in Cosmic Time
Astronomers have spotted a galaxy located 12 billion light years from Earth that unexpectedly looks like a younger version of our own galaxy, the
5 min read
Ripples in the cosmic pond
I know I've said this before, so at the risk of ringing the changes on this once too many times: I find it endlessly fascinating how much we can