Cosmology Class Review

We had Tomo's cosmology class this Tuesday.
Our weekly practice in this class is:
to have someone review on the topic discussed in the previous week.

This week I am the one responsible for the review.
And my topic is:
Comoving, Angular Diameter, Proper Motion and Luminosity Distances, and their relations.

Nowadays people usually prepare slides for presentations.
But I am not used to inserting all the Greek and mathematical symbols on the computer,
so I came out with this idea:

To write down the notes beforehand and do the review in 10 minutes.

Luckily, other students taking the class didn't find it too hard to follow.

And my job was done! :D

Weekend in NTHU Campus

NTHU has a beautiful campus with hills and lakes. We usually go to Cheng-Kung lake during the weekends. My son, Ural (21 months old), loves to feed the fishes and the turtles.

 

Sometimes we watch squirrels having lunch.

This is not special for weekends, but he also loves to watch the garbage truck, he can spend half an hour just by watching it. I appreciate the garbage collector who visits the campus so often.

We visited the Lulin Observatory

Last weekend (2016/10/05~2016/10/06), we visited the Lulin Observatory for the Observational Astronomy class. Besides, we enjoyed hiking in the mountain with the extremely beautiful scene.

The observatory is located on the top of a mountain called 鹿林前山, which is 2862-meter height.

The 1-meter telescope!

Here come some photos of mountains view

We went hiking in the first day evening.

The "moonrise"! (Unfortunately, it was full moon on that day.)

Hiking again in the second day morning. We love mountains!

Colloquium on Sept. 30, 2016

After the long summer,
we started off our first colloquium at NTHU this semester with this talk:



(It was a pity that I did not take any picture during the colloquium...
'Cause I was busy taking notes! (Scribble... scribble...) )

It was an awesome talk by our alumnus - Dr. Yen-Chen Pan (潘彥丞).

(If I did not get anything wrong...)
I summarize the talk below :)

In 2011, Perlmutter, Schmidt and Riess won the Nobel Prize in Physics
"for the discovery of the accelerating expansion of the Universe
through observations of distant supernovae."
Detailed studies on 'supernovae' are therefore important in probing the cosmic expansion.
Especially, the Type Ia Supernovae (SNe Ia), which people often call them 'standard candles'
due to the consistent peak luminosity produced.
In their work, they studied the relation between SNe Ia and their host galaxies
using high quality photometric and spectroscopic data.
They concluded that:
1. SNe are Fainter in More Massive galaxies.
2. SNe are Fainter in galaxies with Higher Metallicity.
3. SNe are Fainter in Older galaxies.
4. Metallicity may have More contributions to systematic errors than stellar mass.

It was fun having a lot of discussions and asking lots of follow-up questions
when we were having snacks at the lounge after the talk!

Well... again... I did not take any picture during the tea time...
'Cause I was busy asking questions... QAQ

(By Valerie :D)