So, You Want To Be An Astrophysicist? Part 0: redux [Dynamics of Cats]

What should a high school student do to get on a track to become an astrophysicist? Reworked from a rework from an oldie. Something prompted me to think it is time to lightly update and republish this series, possibly with added bonus parts!

So, youre in high school wondering what to do with yourself, and you think: hey, I could be an Astrophysicist!

So, what should YOU do, wanting to get into a good university and an astro/physics major?

1) Take all the math that is offered, and do well in it. The limiting factor for most students wanting to do astronomy or astrophysics is poor math preparation in school. You need to get as far and as fast in calculus as you can and be proficient and comfortable with advanced mathematics.

Astrophysics is a mathematical science. In principle, you can pick up the math you need as you go along, but in practise it is better to be as fluent as possible first, and most all math is of some use. My anecdotal observation is that a primary factor limiting peoples ability to progress in astrophysics is inadequate math preparation and insufficient capacity to get up to speed with the additional math needed when it is needed.

2) Take all the science on offer, and do well in that. In particular, take physics classes. One year of high school physics is Not Enough. Take physics, take as much physics as is offered and you have the opportunity to. The more and earlier exposure to introductory physics, the better. You need to have basic physical concepts deeply ingrained and intuitive and that is best done through overlapping repetition over time. It can all be done in the first two years of undergraduate study, but most people have a hard time getting comfortable when crammed with too many new concepts too rapidly.

There are great physical scientists that were English Majors (seriously)! But, that is not the optimal way to proceed for the average student. Figure you are better off taking physics early if you can, and that more is better, as long as it is not so dreadful as to permanently put you off the subject

3) Get good grades overall; preferably straight A, but B+ will do. It will get you far enough to have a chance to see if you can hack it at the next level. Lower grades can be overcome, there is no permanent record, but it makes it harder to get over the next hurdle, or even be allowed to attempt the next hurdle, if you go into it with below average grades.

4) Do all of this without overextending yourself; university is harder with much more intense workload, you need to be able to step up the pace (and again at grad school).

5) Jump through whatever hoops are needed, try to enjoy the process, or just grit your teeth and do it; the real world is worse that way.

View post:

So, You Want To Be An Astrophysicist? Part 0: redux [Dynamics of Cats]

The Manifold Path to Millisecond Pulsars

16.12.2013 - (idw) Max-Planck-Institut fr Radioastronomie

Two astronomers from Bonn have proposed a new path for the formation of a newly discovered class of millisecond pulsars with similar orbital periods and eccentricities. In the scenario of Paulo Freire and Thomas Tauris, a massive white dwarf star accretes matter and angular momentum from a normal companion star and gro ws beyond the critical Chandrasekhar mass limit. The new hypothesis makes several testable predictions about this recently discovered sub-class of millisecond pulsars. If confirmed, it opens up new avenues of research into the physics of stars, in particular the momentum kicks and mass loss associated with accretion induced collapse of massive white dwarfs. Neutron stars can spin very fast with a record value of 716 rotations per second. Such extreme objects are known as millisecond pulsars. Ever since their first discovery in 1982, it has been thought that they are old dead neutron stars that are lucky enough to be in binary star system. As the companion evolves, it starts transferring matter onto the neutron star, spinning it up. This sort of system is known as an X-ray binary. Eventually the companion evolves into a white dwarf star, accretion stops and the neutron star becomes a millisecond pulsar, detectable through its radio pulsations. The orbits of these systems have very low eccentricities, meaning their orbits are extremely close to being perfect circles. This is a consequence of the tidal circularization that happens during the mass transfer stage. Such a scenario has been confirmed both in theoretical work and in the discovery of several systems in different stages of their evolution from X-ray binaries to millisecond pulsars.

However, recent discoveries like PSR J1946+3417 are hinting at the possibility of different formation paths to millisecond pulsars. This source is among 14 new pulsars recently discovered with the Effelsberg 100-m radio telescope. Spinning 315 times per second, this is clearly a millisecond pulsar; however, its orbital eccentricity is 4 orders of magnitude larger than other systems with a similar orbital period. Its companion mass is about 0.24 solar masses, most likely a helium white dwarf. Interestingly enough, at about the same time, two systems with similar parameters were discovered using the Arecibo 305 m radio telescope.

It is quite possible that these binary systems started their evolution as triple systems which became dynamically unstable, as in the case of PSR J1903+0327, the first millisecond pulsar with an eccentric orbit. However, this process generates a wide variety of orbital periods, eccentricities and companion masses, quite unlike the three new discoveries, which are in everything very similar.

The new theory builds on previous extensive computational work lead by Tauris. It makes a prediction for the new type of systems: they should have orbital periods between 10 and 60 days, but with a concentration towards the middle of that range, almost exactly as observed for the new systems.

"Our new approach is very elegant", says the lead author, Paulo Freire from MPIfR. "But whether Nature is really making millisecond pulsars this way is not known yet.''

For the next few years, the pulsar team at the Fundamental Physics In Radio Astronomy Group at MPIfR will be involved in testing the predictions of this scenario, particularly by doing optical follow-up studies and by making precise mass measurements of the pulsars and their companions, a key feature of this study. They will also attempt to find more of these pulsar systems using the Effelsberg radio telescope.

"The neat thing is that if the theory passes these tests, it will allow us to learn much more about the kicks and mass loss associated with accretion induced supernovae, and even about the interiors of neutron stars. It might thus be an extremely useful piece of understanding", concludes Paulo Freire.

------------------------------

The paper appears as a Letter in Monthly Notices of the Royal Astronomical Society.

See the original post here:

The Manifold Path to Millisecond Pulsars

Columnist: Joe Riley: the late great Sir Patrick Moore monocled scrutineer of the heavens

THAT late monocled scrutineer of the heavens, Patrick Moore, was a great supporter of the Liverpool John Moores telescope in the Canaries. Let's hope, as part of his legacy, its perpetually threatened survival will not be the victim of any future cutbacks.

See original here:

Columnist: Joe Riley: the late great Sir Patrick Moore monocled scrutineer of the heavens

Memorable Space Tweeps of 2012

To space Tweeps, Twitter is so much more than just a news service. It’s a community, a spot where everyone can showcase their interests and form professional bonds with each other. The most prominent space-themed Twitter accounts of 2012 somehow transcended their original purpose, too. A NASA Mars Curiosity account ended up hobnobbing with comedian [...]

Read this article:

Memorable Space Tweeps of 2012

PlayStation Plus: Super Street Fighter IV Arcade Edition Free for Members

This week PlayStation Plus continues the piping hot delivery of updates to keep you warm this December. Last week, you took the plunge into the underwater world of Rapture with BioShock 2 joining the Instant Game Collection. This week, you’ll be busting out your shoryukens and controlling gravity with two great games: Super Street Fighter IV: Arcade Edition and Rochard! Also, for those wondering ...

Original post:

PlayStation Plus: Super Street Fighter IV Arcade Edition Free for Members

X-ray Burst May Be the First Sign of a Supernova

GRB 080913, a distant supernova detected by Swift. This image merges the view through Swift’s UltraViolet and Optical Telescope, which shows bright stars, and its X-ray Telescope. Credit: NASA/Swift/Stefan Immler The first moments of a massive star going supernova may be heralded by a blast of x-rays, detectable by space telescopes like Swift, which could [...]

View original post here:

X-ray Burst May Be the First Sign of a Supernova

Skin Packs and other Gadgets – Video


Skin Packs and other Gadgets
Es hat noch nen paar Fehler aber fr den ersten Versuch... 1.Song: Runnin - Jake Miller 2.Song: Astro Physics - Droideka 3.Song: I`ll be - Dipher ft DIZA Skin Packs: HUD Blue, Sometimes Life Green, Alienware Green Rainmeter: Iron Man, HUD Blue Digital Windows to 3D: Madodate Full Glasses Docks are in Skin PacksFrom:JuSa1696Views:3 0ratingsTime:07:43More inHowto Style

Go here to read the rest:

Skin Packs and other Gadgets - Video

Powers of Ten – Never To Be Found – Video


Powers of Ten - Never To Be Found
Music: "Powers of Ten" and "Never To Be Found" by Most Dangerous Time Masterz DOWNLOAD FREE ALBUM @ mdtm.bandcamp.com Video: Powers of Ten: From Macro to Micro (NOTE: WE DO NOT OWN THIS FOOTAGE, NOR DID WE TAKE ANY PART IN CREATING IT. NO COPYRIGHT INFRINGEMENT INTENDED.) Music dedicated to the research and studies of: Astronomy, Cosmology, Biology, Physics, Astro Physics, Space Science, and to all the great minds working towards the progression of a cosmic society.From:TimeMasterzViews:345 2ratingsTime:09:29More inMusic

Link:

Powers of Ten - Never To Be Found - Video