Pulsars, X-Ray Binaries and Kilonovas

[@marcuspradas1037]

AS it has already been said by others, for me this is the best series on astronomy I've seen!

[@fatarchon]

Thank you so much for all of these videos. By far one of the best series I've seen on astronomy! It is appreciated

[@mitchjacobs7603]

Such high quality content! I'm writing a paper on history of supernovae discovery the past few weeks and you have been so helpful

[@astrocozzyamfilohiades71]

Regardless, I still do appreciate all the visuals & graphical, explanations. You've really elevated my knowledge, over Neutron stars, ten fold.-tks.

[@astrocozzyamfilohiades71]

Greatly appreciated, on further clarification regarding, these enigmatic objects.-tks.

[@nightrous3026]

The vela pulsars pulses converted to sound sounds like a helicopter. Also theres a pulsar out there that spins at 1/7 the speed of light. It sounds like a mosquito

[@bryandraughn9830]

Excellent!

[@taraswertelecki7874]

If I am not mistaken, the Crab Pulsar is feeding 30,000 times more energy than the Sun emits every second to the Crab Nebula to keep it glowing as brightly as it is. Amazing considering that the pulsar itself is only the size of a city but with a mass of 1.4 times the Sun.

[@jonnyroxx7172]

Beautifully done! Do you have any lectures coming up?

[@ComradeArthur]

5:14 "no know astronomical object, other than a neutron star, ..." The pulses were detected before anyone knew neutron stars existed! If I remember the book "Frozen Star" correctly (and I don't remember it all that well) they used the pulse data to work out what an astronomical object that could make those pulses had to look like. And the model they came up with had the specs of a neutron star.

[@Dazzwidd]

Very interesting subject, what makes me particularly curious is what radio wavelengths they emit the most strongly and the nature of those emissions. They definitely aren't going to be like a defined carrier frequency signal like from a radio transmitter but obviously more broad. However I'm not convinced that it's going to manifest like a shooshing white noise emission necessarily either. Do you know what the typical spectral characteristics are?

[@JasonKendallAstronomer]

The emission process for such objects is what's called "Synchrotron Radiation". Light (radio waves) are emitted by accelerated electrons and protons (mostly the former) moving along the magnetic field lines at nearly the speed of light. Because electrons go around in a circle perpendicular to a uniform magnetic field (i.e. the Larmor motion or Gyro-radial motion), they accelerate. (Acceleration is what must be done to keep something going in a circle.). When you accelerate an electron, it makes electromagnetic radiation. So, rather than thermal radiation, which has a typical blackbody spectrum, or a low-density, high temperature emission spectrum, such as a hot cloud of gas, this radiation comes from constrained electron motion. The electrons and protons cruise at nearly the speed of light along the field lines, and as they do so, they make little helical patterns. This makes the radiation. Now, the spectral energy distribution is quite different than a thermal distribution, and so can be distinguished easily with multi wavelength studies. The Crab Pulsar makes light in this way.

[@Dazzwidd]

@@JasonKendallAstronomer Hi Jason, thanks for your detailed response. Very interesting. I had an amusing mental picture of a pulsar coming close enough to earth to block out all the fm radio stations locally and what it would sound like as you tuned the band- assuming you weren't experiencing any modulation effects from rotation. Anyway I think that the emissions might just manifest as broad spectrum RF noise so the radio stations might just think that their transmitters were offline, kinda perplexing!

[@JasonKendallAstronomer]

If one got close enough to mess with FM radio, we'd probably be more worried about the life-destroying x-ray bursts as cometary material plunged onto its surface....

[@Dazzwidd]

@@JasonKendallAstronomer It wouldn't have to be that close to be wrecking terrestrial radio services 😆

[@oguzaltnbas3108]

I was wondering how two Neutron Stars happen to come together in space? In a binary system, stars evolve at the same time and explode at the same time creating two Neutron stars? Or one companion explodes and NS gives Red Giant some mass and make it NS as well? These are my thoughts. Could you please provide me this information?

[@JasonKendallAstronomer]

How stars form a covered in my lecture with the same name: Galactic Nurseries: The Formation and Birth of Stars kzbin.info/www/bejne/aXa0dJKAg5h1ZpY

[@astrocozzyamfilohiades71]

Hi Jason. You indicated 1lyr = 10 to the 13m but, its +/- 10 to the 15m.

[@JasonKendallAstronomer]

Thanks for the correction.

[@astrocozzyamfilohiades71]

@@JasonKendallAstronomer sure... Ok. Just thought I'd let you know... You've educated me so much further, on Neutron stars. Really, do appreciate it.-tks.

[@Erik-rp1hi]

I wonder how much we will learn of the workings of the universe from the field of gravity waves. As I understand it now we can detect only few frequency's with the least sensing detectors. In 50 years the data will be much richer.

[@brianareilley7967]

Is red shift the only evidence of an expanding universe?

[@JasonKendallAstronomer]

No, but it's the one that cannot be explained in any other way. Please watch my series of Big Bang videos: kzbin.info/www/bejne/pGPMiat_frOrfZo

[@Kenneth_H_Olsen]

Its Jocelyn Bells survey, who made discovery, and documented the deviation ! Nobelprize material and her ADVISER get the Nobel price . hmmmmmm .

[@JasonKendallAstronomer]

Yeah, that happened. Go check out the history on it, and read more about her amazing later work.