Milky Way's graveyard of dead stars MODELED

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notFritzArgelander
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Milky Way's graveyard of dead stars MODELED

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Post by notFritzArgelander »


modeled is in caps since the "found" in the article title is sheer hype. no observations have been made yet. this is a theoretical modeling effort only.

https://phys.org/news/2022-09-milky-gra ... stars.html

the paper is more faithful to this interesting work. it should be useful in correcting high energy photon signatures in dark matter hunts for the presence of these objects.

https://academic.oup.com/mnras/advance- ... ogin=false
We chart the expected Galactic distribution of neutron stars and black holes. These compact remnants of dead stars – the Galactic underworld – are found to exhibit a fundamentally different distribution and structure to the visible galaxy. Compared to the visible galaxy, concentration into a thin flattened disk structure is much less evident with the scale height more than tripling to 1260 ± 30 pc. This difference arises from two primary causes. Firstly, the distribution is in part inherited from the integration over the evolving structure of the galaxy itself (and hence the changing distribution of the parent stars). Secondly, an even larger effect arises from the natal kick received by the remnant at the event of its supernova birth. Due to this kick we find 30 per cent of remnants have sufficient kinetic energy to entirely escape the Galactic potential (40 per cent of neutron stars and 2 per cent of black holes) leading to a Galactic mass loss integrated to the present day of ∼0.4% of the stellar mass of the galaxy. The black hole – neutron star fraction increases near the Galactic centre: a consequence of smaller kick velocities in the former. Our simulated remnant distribution yields probable distances of 19 pc and 21 pc to the nearest neutron star and black hole respectively, while our nearest probable magnetar lies at 4.2 kpc. Although the underworld only contains of order ∼1% of the galaxy’s mass, observational signatures and physical traces of its population, such as microlensing, will become increasingly present in data ranging from gravitational wave detectors to high precision surveys from space missions such as Gaia.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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