Archive for Markus Pössel

New Publication at the Open Journal of Astrophysics!

Posted in Open Access, The Universe and Stuff with tags , , , , on August 4, 2020 by telescoper

Another new paper has been published in the Open Journal of Astrophysics! This one was actually published last Friday but it being the Bank Holiday weekend I just got round to blogging about it today. This is another one for the Cosmology and NonGalactic Astrophysics section. It’s called Cosmic event horizons and the light-speed limit for relative radial motion and is a sort of pedagogical review of the subject aimed at dispelling some common misconceptions about radial velocities and horizons. The author is Markus Pössel of the Max Planck Institute for Astronomy at Heidelberg.

Here is a screen grab of the overlay:

I’ve taken the liberty of adding the background teaser image in full here, as it is rather groovy:

You can click on the image to make it larger.

You can find the arXiv version of the paper here.

New Publication at the Open Journal of Astrophysics!

Posted in Open Access, The Universe and Stuff with tags , , , , , , on January 8, 2020 by telescoper

It’s two in two days because we have published another new paper at The Open Journal of Astrophysics. The title is A Beginner’s Guide to working with Astronomical Data. Here is a grab of the overlay:

You can find the arXiv version of the paper here.

The author is Markus Pössel of the Haus der Astronomie at the Max Planck Institute for Astronomy in Heidelberg (Germany). This is a long paper – 71 pages with over a hundred figures – that gives a comprehensive introduction to the various kinds of astronomical data and techniques for working with such data. I think this paper will attract a lot of interest from many different kinds of people but it will be particularly interesting to students doing undergraduate projects involving astronomical data (and their supervisors).

Another point worth noting is that there’s a small addition to the overlay for this paper, which will apply to all future papers (and retrospectively once we have worked through the back catalogue) and that is in the bottom left of the image above. It shows that the article is published with the latest form of Creative Commons License (CC-BY-4.0). It has always been our policy to publish under a CC-BY licence but Scholastica have very helpfully set up a new facility to make this explicit on each page. This is part of our efforts to ensure that we are compliant with Plan S which makes CC-BY licenses mandatory.

UPDATE: the CC-BY-4.0 license has now been applied retrospectively to all our publications.

The Expanding Universe: An Introduction

Posted in The Universe and Stuff with tags , , on January 5, 2018 by telescoper

For those of you reading this blog who feel they need an up-to-date primer for the basics of modern cosmology without too much technical detail, I found a paper on the arXiv that might give you what you want. It’s over a hundred pages long but does not use much complicated mathematics but has some nice illustrations. The author is Markus Pössel; the abstract reads

An introduction to the physics and mathematics of the expanding universe, using no more than high-school level / undergraduate mathematics. Covered are the basics of scale factor expansion, the dynamics of the expanding universe, various distance concepts and the generalized redshift-luminosity relation, among other topics.

This paper focusses on the basics of the standard framework founded on general relativity, especially how cosmological distances are defined and measured, rather than on trendy modern topics like dark energy and the cosmic microwave background. I’d say any first-year physics student should be able to cope with it, but it’s not for someone who hasn’t learned calculus. On the other hand, it’s free to download so you don’t have much to lose by having a look!

You can download a PDF here.