ニュートロン星とブラックホールの間の質量ギャップにあるコンパクトな物体を持つバイナリにおけるパルサー

Ewan D Barr¹, Arunima Dutta¹, Paulo C C Freire¹

¹Max-Planck-Institut für Radioastronomie, 53121 Bonn, Germany.

Science (New York, N.Y.)

|January 18, 2024

まとめ

天文学者は球状星団NGC 1851のパルサーを研究した. その質量は中性子星とブラックホールの質量ギャップに収まりこのコンパクトな物体の起源を示唆しています

科学分野:

天文学
天体物理学
重力波天文学

背景:

中性子星とブラックホールの間の質量を持つコンパクトな物体は観測されていますが,その性質と形成は不明です.
これらの質量ギャップオブジェクトは,恒星の進化とコンパクトオブジェクト形成の現在の天体物理学モデルに挑戦しています.
これらのオブジェクトを理解することは重力波のイベント集団の解釈に不可欠です.

研究の目的:

二重パルサーPSR J0514-4002Eのコンパクトな伴星の性質を調査する.
伴い物体の質量が天体物理の質量ギャップに合っているかどうかを判断する
質量ギャップオブジェクトとその宿主バイナリーシステムの形成メカニズムを探求する.

主な方法:

カルーアレイ望遠鏡 (MeerKAT) を使用してPSR J0514-4002Eの精密なパルサータイミング観測を行った.
軌道のパラメータを分析して二進体の総質量を得ました
多波長観測を用いて同伴物体を特徴づけました

主要な成果:

PSR J0514-4002Eの合計二重質量は3.887 ± 0.004の太陽質量で決定されました.
伴い物体の質量を2.09~2.71太陽質量 (95%信頼区間) に制限した.
中性子星とブラックホールの質量ギャップに伴っていることが確認されました

結論:

伴星は質量ギャップの物体で潜在的に非常に質量のある中性子星や低質量ブラックホールです
観測された質量は,以前の2つの中性子星の合併を含む形成シナリオを示唆しています.
この発見は,質量ギャップでコンパクトな物体を形成する中性子星の合併の観測証拠を提供します.

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