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18 votes
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Metallicity in gravitational wave astronomy

As you say, metallicity in this context refers to the proportion of the interstellar medium a star forms from that consists of elements heavier than helium. It can be expressed as a (mass) fraction (...
ProfRob's user avatar
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9 votes

Can Neutron Star merger remnants solve the black hole mass gap? Why can't we observe them?

We can't observe the results of these mergers because they are either isolated black holes or they are isolated, massive neutron stars. In neither case is there anything to observe. Compact objects ...
ProfRob's user avatar
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8 votes
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What is the maximum possible peak power during a black hole merger?

The peak power (or luminosity) is roughly proportional to $\nu^2$, where $$\nu = \frac{m_1 m_2}{(m_1+m_2)^2}$$ is the symmetric mass-ratio (This follows from the fact that the luminosity in general is ...
TimRias's user avatar
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6 votes

Difference between NSBH and BHNS mergers

Both articles are referring to the detection of gravitational wave sources where one component is of low enough mass to be considered a likely neutron star, whereas the other is more massive, and too ...
ProfRob's user avatar
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6 votes
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What is the detection threshold of gravitational waves for LIGO?

I'm afraid this is not straightforward The amplitude of the gravitational wave strain signal from a merging compact binary (neutron star or black hole) is $$h \sim 10^{-22} \left(\frac{M}{2.8M_{\odot}}...
ProfRob's user avatar
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4 votes

What is the detection threshold of gravitational waves for LIGO?

Figure 1 of this paper shows the horizon distance (distance to which a circularly polarised overhead signal would be detected at SNR 8) for larger mass systems up to total mass of 1000 solar masses, ...
Matt Pitkin's user avatar
1 vote
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What would be the product between the collision of a white dwarf and a main sequence star?

This may seem like a simple question, but it can be quite complicated. Does it depend on the mass of the main sequence star? Yes. Assuming the main sequence star approaches the white dwarf star on a ...
Daddy Kropotkin's user avatar
1 vote
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What is the difference between the terms collision and merger? How are they used differently in Astronomy?

Partial answer to share what I've found to date: Galaxies The term "merger" does have widespread use in galactic-dynamics. The word "merger" appears 71 times Wikipedia's Galaxy ...
uhoh's user avatar
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