Discussion of astrophysical implications of GW150914: March 11th, 2:30pm

Next week we will discuss the astrophysical implications/progenitors of the GW150914 event observed by LIGO. I invited some of the experts on stellar astrophysics in our department to join the discussion and we will have  Riccardo Sturani (IFT UNESP) from the LIGO Collaboration joining our discussion. It should be fun!
The papers we are planning to discuss are the following ones (links for the papers available here):
  • Astrophysical Implications of the Binary Black-Hole Merger GW150914 (ApJL)
  • The Progenitor of GW 150914 (ApJL, submitted)
  • The origin and evolution of LIGO’s first gravitational-wave source (Science, submitted)
Please go ahead and read one or more of these papers, such that you can understand and contribute to the discussion.
From the abstract of the first paper:
Such black-hole mergers [GW150914] have been predicted in two main types of formation models, involving isolated binaries in galactic fields or dynamical interactions in young and old dense stellar environments. The measured masses robustly demonstrate that relatively “heavy” black holes (25M25M) can form in nature. This discovery implies relatively weak massive-star winds and thus the formation of GW150914 in an environment with metallicity lower than 1/212 of the solar value. The rate of binary black-hole mergers inferred from the observation of GW150914 is consistent with the higher end of rate predictions (1Gpc3yr11Gpc3yr1) from both types of formation models. The low measured redshift (z0.1z0.1) of GW150914 and the low inferred metallicity of the stellar progenitor imply either binary black-hole formation in a low-mass galaxy in the local Universe and a prompt merger, or formation at high redshift with a time delay between formation and merger of several Gyr. 
Join our conversation this Friday, March 11th, 2:30pm, sala G14. Don’t forget to have a look at the papers.
Looking forward to see you all next Friday at the usual time and place.


Como chegar na Sala G14 (torre G):
  • siga na direção do auditório do IAG, até o final do corredor
  • ao invés de descer as escadas, suba dois lances e você vai encontrar a sala G14

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