Talk:Astronomical spectroscopy

message: This article was automatically assessed because at least one WikiProject had rated the article as start, and the rating on other projects was brought up to start class. BetacommandBot 09:44, 10 November 2007 (UTC)
thread_title:  WikiProject class rating

message: This article is only about optical spectroscopy. Some info about radio spectroscopy (21 cm line, interstellar molecules, etc) needs to be added. Hobbema (talk) 22:30, 5 April 2012 (UTC)
replies: text: Agreed (though I don't know enough to do it).  Here's a list of important rf spectral lines. —JerryFriedman  (Talk) 22:50, 5 April 2012 (UTC)
thread_title:   Only optical 

message: I was asked by  to provide some comments on this article, which is apparently being edited as part of a university project. This isn't (yet) a GA review, but I hope the following points help. I don't have time to read the whole thing in detail and tag up every issue, but here are some general comments:
*This is a huge topic; as a project I would have chosen something more self-contained!
*It will be a challenge to cover the topic both comprehensively and accessibly (without getting bogged down in details). It actually does a pretty good job of this. Resist the temptation to add more details to areas which have a decent treatment already, and concentrate on improving the breadth of coverage.
*Almost every section and/or subsection is going to be covered in more depth elsewhere. So you're going to need more extensive use of summary style. For example, Doppler shift, redshift, Fraunhofer lines etc. already exist; don't duplicate that material, just summarise it in a couple of paragraphs and direct readers to those articles using  etc.
*Unfortunately some of the things you need to summarise don't have very good articles on Wikipedia (whilst others do). You should still use summary style in the expectation that those articles will expand and improve, but you won't be able to just grab bits of text out of them.
*I think it would help to have a further top-level split, above the existing sections. That would be between 1. Theory and background 2. Wavelengths and instruments, and 3. Scientific results / types of object.
*If you follow the suggestion above, part 3 is currently the best bit, with a good coverage of different types of object and what has been learnt about them from spectroscopy. I suggest a rough size order: solar system, then stars, then ISM, then galaxies. Two areas that are missing, at the opposite ends of the scale, are solar spectroscopy and spectroscopy of the intergalactic medium.
*Part 1 would hold e.g. the Doppler material, and I think it should have more general background on spectroscopy i.e. describe it as splitting up light into colours, again in summary style. A few paragraphs is all that's needed, but enough to set the scene for the reader. It could then discuss chemical elements, Fraunhofer lines, temperature/luminosity etc.
*Part 2 needs the most expansion. In particular, I strongly disagree with the statement 'Astronomical spectroscopy can be broken down into three major bands: optical, radio, and x-ray.' That misses out UV, infrared, and sub-mm astronomy entirely. You should add sections on all of those, again in summary style, and fill out the currently blank X-ray section.
*Part 2 would also benefit from some discussion of particular instruments used. For example, in UV I would expect to see some mention of UV satellites/instruments such as FUSE or STIS (without the jargon acronyms of course). Similarly when discussing optical spectroscopy you could mention the objective prism, echelle spectrograph and integral field spectrograph.
*The discussion of the ISM is a bit confused. You state that the ISM causes absorption lines (you could add the diffuse interstellar bands here), but then all the following discussion is about molecules found by their radio emission. Molecular astrophysics could also be used.
I'd like to reiterate that this is a very big topic which requires knowledge of a lot of overlapping fields. Many entire textbooks have been written on this! It's a lot to ask of an undergraduate project. If you have access to a university library, useful sources could be Astronomical Spectrographs and their History by Hearnshaw and Astrophysical Techniques by Kitchin. I'll try to take a closer look at some point; good luck! Modest Genius talk 22:16, 2 December 2013 (UTC)
thread_title:  Comments from Modest Genius 

message: Is on its side...this photo should be rotated 90 degrees to the right.--James Carlisle (talk) 04:12, 12 May 2014 (UTC)
replies: text: Wow, surprised I never noticed that. I've put in a request to have the image rotated, should be done in a few hours. Primefac (talk) 08:57, 12 May 2014 (UTC)
thread_title:  Rotate first photo 90 degrees clockwise (right) 

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