Benne HolwerdaNarrow Band MagicGalaxy morphology changes once you go to a different color. You are more sensitive to different stellar populations. Blue filters pick up…Oct 4Oct 4
Benne HolwerdaBig Wheel GalaxySpiral galaxies come in all sizes. One of the more impressive things about them is that over 6 orders of magnitude they are self-similar…Oct 1Oct 1
Benne HolwerdaWeighing Dwarf GalaxiesHow much stellar mass is there in a galaxy? We see a certain amount of light from galaxies and that implies a certain number of stars. It…Sep 22Sep 22
Benne HolwerdaHow long has that bar been there?Disk galaxies often have a “bar” at their center. A rectangular shaped, often yellow-ish structure. We understand this is a bunch of the…Sep 14Sep 14
Benne HolwerdaUltraviolet haloesIn a previous blog post I gushed about the wonderful new JWST data on NGC 891, an edge-on galaxy with an ultraviolet halo. This week I’ll…Aug 23Aug 23
Benne HolwerdaGas and dust out of planeSome galaxies get all the attention. This is often simply because it was the easiest to observe to begin with, nice and close, fit in the…Aug 16Aug 16
Benne HolwerdaBackyard Galactic ArchaeologyThere are two ways to explore how galaxies have changed over time with telescopes: first is to look further and further back into earlier…Aug 9Aug 9
Benne HolwerdaCEERS sees interacting galaxiesRecently, I wrote about merger identification using photometric redshift and how close pairs are a good indication of a rate mergers…Aug 3Aug 3
Benne HolwerdaEPOCHS-I photometric redshifts for James Webb Space Telescope deep fields.How far away is that? A simple question that has a lot of implications for anything in the night’s sky. As soon as you leave our own Galaxy…Jul 26Jul 26
Benne HolwerdaGalaxy Merger IdentificationSome good news and some bad news: first the bad, our Milky Way is going to hit the Andromeda galaxy in the future. The good news is that it…Jul 19Jul 19