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Hello everyone!

Some clarifications and updates for the Hinode lab, I realize this is quite a bit of text, but please take the couple of minutes to read it. At the bottom there are also some tips for actually doing parts of the lab.

Administrative stuff:

1) The deadline for delivery is set for the 30th of November, one week from now. Note also that since we are closing in on the end of the semester and results have to be registered with the faculty, the deadline is strict, so please be sure to deliver on time.

2) As has been said at the lecture and group session, this report will not have to follow the article format of before a...

Hi everyone!

The final lab is upon us, and you can find the text for it here. Please take a look at it before the next lab session this Friday! We will be working with IDL exclusively on this one (due to needed libraries etc), as mentioned early on in the semester.

Cheers,

Ainar

Hello everyone,

The curriculum for the final exam is now codified, and consists of:

- The content of all the lecture slides published (see the individual lecture entries)

- The hand-written notes also published on the course website

- The content of the lab-texts you will have worked with before the exam

Cheers,

Ainar

Hello everyone! Below is a partially finished code meant to illustrate how to find the probabilities P(d | n) and P( d | Q ) and the means as well as uncertainties of n and Q.

You will first need to load n_values, Q_values, as well as lnL, from the output of cmb_likelihood.py. For pointers on how to do this - check plot_contours.py  where this is done in the beginning of the file! Also not shown is how to compute dn and dQ - these are the step distances in n_values and Q_values - so here you can simply check the distance in the steps in the arrays you loaded (subtract two adjacent steps). Below it is shown how to find P(n|d) (P_n), finding P_Q is a matter of integrating over the other dimension of P(d | Q,n) (P) in the for loop.

The code:

# First, exponentiate, and subtract off the biggest

# value to avoid overflow and find P(d| Q,n)

P = np.exp(lnL-np.max(lnL))  

# N...

Masterprogrammet i astronomi arrangerer masterorientering torsdag 3. november 2016, kl. 12:00 - 14:00 i rom 304 (peisestua) i 3. etasje, Svein Rosselands hus.

P? orienteringen vil fagmilj?ene ved instituttet presentere seg og informere om mulige masterprosjekter/masteroppgaver. Orienteringen er prim?rt for masterstudenter i astronomi, studenter i sitt siste ?r p? bachelorprogrammet i fysikk, astronomi og meteorologi og eventuelt ?vrige som vurderer ? s?ke opptak p? masterprogrammet i astronomi i 2017. Det serveres pizza!

Meld deg p? her.

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Hello everyone,

First off, there will be a Friday Session again this week, where you can come for help with regards to the COBE lab. I strongly advise to get working on the coding and have your woes and worries laid out so that you can be helped with them - last minute coding troubles are never fun (and it's always questionable if I'll be able to help in time the closer to the deadline you ask).

Secondly - those of you who want to run the pre-supplied code in Python on the *astro* machines may already have run into trouble using the SciPy package that is installed together with the old Python version. After some fruitless efforts trying to rewrite some functions myself, it's clear the package/Python is simply too outdated. For those affected, we'll therefore simply be installing a newer Python version bundled with all packages we need in something called Anaconda. A guide on ho...

Hi everyone,

As far as I can tell, a lot of you are stressed by the Friday-deadline
for the CCD-report, since you're also finishing up a home-exam in
a different subject. We'll therefore be moving the deadline to Monday
(delivery by the end of day), which will hopefully give you some
more breathing room!

Extra update: There will be no friday group this week for the next lab, we'll be holding off in this until next week, so you can focus on your deliveries.

Cheers,
Ainar

Hi,

Firstly, those of you who haven't received your lab-report feedback (at the lecture or group session today), I'm hanging onto them, and you can get them from my post-box down the hallway from my office (or by swinging by my office - send me a mail).

Secondly, regarding the first part of the CCD-lab regarding chromatic aberration, where most groups got no usable images (Thanks to my total loss of memory regarding where the nominal focus was! - Which I discovered with the last group of course...), I want to clarify what is necessary to include.

A not too long mention of the danger of chromatic aberration and how it *would* appear (different focus points for different wavelengths), and the possible consequence when using a color CCD (importance of placement in the correct focus point for the wavelength of interest etc.) is enough. A mention of the setup and how it was attempted to be demonstrated should also be included.  

Cheers,

Ainar

Hello everyone.

Just a quick message that as indicated before, the deadline for the CCD lab-report will be October the 14th.

Also, we will have a session during the normal time (12:15-14:00) this Friday (October 7), where I will be available to help with the CCD lab image analysis/ programming.

Cheers,

Ainar

Hi,

The problem text and files for the SST exercises can be found here.

To download the files while connected to a linux machine at the institute, run this command in your working directory:

wget address-of-file

To unpack the .tar file run:

tar -xvf file.tar

Extra note for IDL: to get access to fzread, after setting everything up as normal, but *before* running the sswidl command, run the following in the terminal:

Updated setenv command below!

setenv IDL_DLM_PATH "/astro/local/rsi/idl64/bin/bin.linux.x86_64/:+/mn/stornext/u3/rouppe/idl/ana-linux"

Cheers,

Ainar

Hi,

You can now find the practical lab-text for the CCD lab exercises here, please check them out before you come to the lab.

Furthermore, as not to clutter the text and being able to include some IDL tips specific to the lab, you can find a text on what we mean by noise in the lab and some other things here. This will be mostly useful for when you write the actual report, so check this out then!

Lastly, as alluded to above, there will be some use of IDL (Interactive Data Language) in this course. For this lab, it is optiona,l and you are free to complete the relevant exercises in whatever language you choose (for most of you this will probably be Python or Matlab).

For later programming labs, this was also be the case, except for the Hinode lab late in the semester, where som...

Hi everyone,

For the Lab-report I got a question about mentioning the correct K₁ = 1.22 (the Reyleigh criterion) in the report, so I though I'd clarify here.

Mentioning the correct value (even though you are to "discover it") is okay - you can for example mention that a theoretical calculation (which you don't have to do) would predict the correct value, and then contrast it to your value. This is also relevant for the second part where you use the value with regards to the JWST - here you can use the theoretical value and contrast to your experimental value, and see the effect of the experimental uncertain value has on your results.

If you have already completed your report and don't have time to add in comments about the correct value, you will not be penalized.

Cheers, Ainar

Hello everyone!

Next week we'll be holding the next round of labs. As last time, please go to the doodle here and sign up for a time that works for you, as last time, try to fill up slots before signing up to empty ones. As before, it's first-come-first-served. Also as before, let me know if there are any problems signing up, finding a time that works for you, or anything else! The next lab will deal with CCDs, and the text will be made available in a message before the lab.

Cheers,

Ainar

Hello everyone!

As alluded to at/after the labs, there will be a Friday session at the nominal time (12:15-14:00) where I will talk a bit about what is expected of your lab-reports, and talk a bit about uncertainty calculations.

Beforehand, please read these report-reminders. Read these! There is a distinct possibility of snide remarks if you don't and proceed to ask questions that are answered in the text (though of course overlooking stuff in the text is always okay).

Furthermore, there are two links included in the pdf linked above about uncertainty calculations, which I highly encourage to take a look at beforehand as well.

Lastly, the deadline for the first lab-report is set to the 23. of September, two weeks after this Friday session.

Cheers,

Ainar

Hi, just a small message:

As you'll be recording images during the lab, please bring a USB-stick if possible so that you can transfer them (the lab-computer is not allowed to be connected to the UiO-net).

Cheers,

Ainar

Hi Everyone! 

The lab-text for the Diffraction Lab is now available here. Please read it before you attend the lab so you know what you're getting into. I hope everyone wanting to follow the course has signed up for a lab-time, since we still have a smaller number of participants for the doodle than at the 1st lecture. So if you haven't signed up yet - do so now! 

Cheers,

Ainar

Hello everyone!

It is time to sign up for the semester's first lab-exercise, which will deal with diffraction. This lab-exercise, as well as the ones later in the semester are obligatory. So please read this entire message!

Please follow the link here in order to sign up! NOTE: I have set up five groups so far, with room for four students in each. Less than 20 students showed up for the first lecture, so hopefully this will be enough.

The poll works by a first-come-first-served basis, so be quick to sign up if you are limited in when you are able to show up - with that said, let me know if none of the times work for you/ or if the only times working for you were snatched up early, we will then figure something out. Also let me know if all of the slots are filled before you managed to sign u...

For participating in compulsory exercises, setting up an e-post list etc., we need immediately that all who are to take the course AST2210 in the autumn semester 2016 send an e-mail to:

h.k.k.eriksen@astro.uio.no and per.lilje@astro.uio.no with the following content:

Full name

E-mail address

User name on UiO computers

Is it highly probable that you will participate in excursion to La Palma (yes/no).

Hans Kristian, Per and Ainar

The days September 5-8 is the Kavli Prize week, when the Kavli Prizes are awarded in Oslo. The most important prize is of course (at least for us) the Kavli Astrophysics Prize, this year awarded to the leaders of the LIGO team, which for the first time detected gravitational waves from outer space.

There are several events which are of high interest to the AST2210 students, and we recommend that you attend as many as possible of them:

On the 5th of September at 09:00 in Georg Sverdrup's hus, two of the leaders of the LIGO team, Kip Thorne and Rainer Weiss, will give the lecture "Probing the Universe with Gravitational Waves". This is highly recommended! Register on http://registration.kavliprize.org/rsvp/

On the 6th of September is the Award ceremony when the laureates will receive their prizes from HRH Crown Prince Haakon in Oslo Concert Hall at 14:00 - 15:30 (refreshments served...

Studieturen til La Palma er ikke tidsbestemt enda, og tidspunktet som er indikert i timeplanen er derfor kun en h?yst midlertidig placeholder.

Undervisningsstilen i dette kurset vil legges litt om i ?r i forhold til tidligere. De tre ukentlige forelesningstimene vil fordeles mellom gjennomgang av viktige astronomiske observatorier (1. time), teoretiske konsepter relevante for det aktuelle observatoriet (2. time), og prosjektarbeid/oppgavel?sning (3. time). Pensum er formelt definert av det som foreleses i alle disse tre timene, og dekkes i praksis av kombinasjonen av forelesningsnotater og slides som vil gj?res tilgjengelig p? disse hjemmesidene. Merk imidlertid at forelesningsnotatene dekker mer enn det som formelt er pensum.