Essays about: "black hole"

Showing result 6 - 10 of 77 essays containing the words black hole.

  1. 6. Finding the Seeds of Supermassive Black Holes: The Direct Collapse Black Hole Scenario

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Weihui Li; [2023]
    Keywords : ;

    Abstract : The origin of supermassive black holes (SMBHs,∼ 10^9M⊙) in the first billion years of cosmic history remains a mystery. Direct Collapse Black Holes (DCBHs,∼ 10^4M⊙) are considered one of the most promising hypotheses for the progenitor of SMBHs, as they are believed to provide a favorable starting point as massive seeds for SMBH formation. READ MORE

  3. 7. Preventing Rescue of Maritime Migrants

    University essay from Lunds universitet/Juridiska institutionen; Lunds universitet/Juridiska fakulteten

    Author : Stina Stefansson; [2023]
    Keywords : migration; search and rescue; deterrence of migrants; irregular migration; humanitarian assistance; securitisation; rightlessness; migrant smuggling; refugee law; Law and Political Science;

    Abstract : Eighteen of twenty-five rescue-vessels operated by NGOs in the Mediterranean has been subjected to administrative or criminal sanctions. Whether rescue amounts to a crime is the basis for this thesis, which examines the intersection between prevention of the transnational crime of smuggling, and the rescues often necessary when smugglers facilitate journeys across the sea. READ MORE

  4. 8. Hyper-velocity stars from globular clusters hosting intermediate-mass black holes

    University essay from Lunds universitet/Astrofysik; Lunds universitet/Fysiska institutionen

    Author : Matilda Skantz; [2023]
    Keywords : Hypervelocity stars; run-away stars; stellar binary; intermediate mass black hole; globular cluster; Hills mechanism; Physics and Astronomy;

    Abstract : In 1988 Hills proposed that stars can gain velocities above 500 km s−1 if they are in a stellar binary which gets disrupted by a super massive black hole (SMBH). One of the stars would get trapped in an elliptical orbit around the SMBH while the other gets ejected and obtains a relatively high velocity. READ MORE

  5. 9. Investigating a possible dearth of stars with zero angular momentum in the solar neighbourhood.

    University essay from Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Fysiska institutionen

    Author : Aayush Desai; [2023]
    Keywords : Galaxy: disk; Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; Galaxy: nucleus; solar neighborhood; stars: kinematics and dynamics; Physics and Astronomy;

    Abstract : Background. Carlberg & Innanen (1987) first proposed the idea of measuring the solar re- flex velocity (the velocity of the Sun around the galactic centre), Vg,⊙, using the momenta of the stars in the solar neighbourhood. The proposal was a consequence of the work of L. READ MORE

  6. 10. Searching for direct collapse black holes using the James Webb Space Telescope

    University essay from Uppsala universitet/Institutionen för fysik och astronomi

    Author : Edison Arellano Almeida; [2022]
    Keywords : extragalactic astronomy;

    Abstract : Recent detections of massive quasars at z > 6 has proven to be an interesting challengefor cosmology given the short time frame that these objects have to reach a certainmass via conventional methods (e.g., galaxy mergers). READ MORE