1 / 28

In this lecture we look at: 1) Neutron stars in x-ray binaries 2) Mass-radius relationship

In this lecture we look at: 1) Neutron stars in x-ray binaries 2) Mass-radius relationship 3) Strange star candidates 4) Quark deconfinement at T=0 5) Astrophysical signals of quark matter. Alfen radius. RXJ 1856.5-3754. Drake et al. point out that this NS may in fact be a quark star

mahala
Download Presentation

In this lecture we look at: 1) Neutron stars in x-ray binaries 2) Mass-radius relationship

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. In this lecture we look at: 1) Neutron stars in x-ray binaries 2) Mass-radius relationship 3) Strange star candidates 4) Quark deconfinement at T=0 5) Astrophysical signals of quark matter

  2. Alfen radius

  3. RXJ 1856.5-3754 Drake et al. point out that this NS may in fact be a quark star (astro-ph/0204159) because of its small radius, which they argue is in the range between R' = 3.8 and 8.2 km!! ÄÄ Nasa press release of 10 April 2002: "Cosmic x-rays reveal evidence for new form of matter" WWW.msfc.nasa.gov/news

  4. Star's x-ray spectrum is well represented by a black body with a temperature of T'=7x105 K (X60 eV) The observed x-ray flux and temperature correspond to a stellar radius of R'= R (1-2M/R)-1/2 Y f (D/120 pc) km Drake et al.: R'=3.8 to 8.2 km

  5. Rotationally deformed, rotating neutron star

  6. Pulsar 3C58 • A 65 ms pulsar (J0205+6449) was discovered by Murray et al. (to appear in the ApJ, 2002). • This pulsar is at the center of 3C58, a young Crab-like supernova remnant (SN 1181). • Thus 3C58 is somewhat younger than Crab. • The pulsar's surface temperature is 1.12x106 K (Slane, Helfand, Murray, astro-ph/0204151, to appear in the ApJ) Nasa press release of 10 April 2002: "Cosmic x-rays reveal evidence for new form of matter" www.msfc.nasa.gov/news

More Related