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Articles by Stella Ocker
A gas-rich cosmic web revealed by the partitioning of the missing baryons - Nature Astronomy
Abstract Approximately half of the Universe’s dark matter resides in collapsed halos; significantly less than half of the baryonic matter (protons and neutrons) remains confined to halos. A small fraction of baryons are in stars and the interstellar medium within galaxies. The majority are diffuse (<10−3 cm−3) and ionized (neutral fraction <10−4), located in the intergalactic medium (IGM) and in the halos of galaxy clusters, groups and galaxies.
Detection of X-ray emission from a bright long-period radio transient - Nature
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Abstract Recently, a class of long-period radio transients (LPTs) has been discovered, exhibiting emission thousands of times longer than radio pulsars1,2,3,4,5. These findings, enabled by advances in wide-field radio surveys, challenge existing models of rotationally powered pulsars. Proposed models include highly magnetized neutron stars6, white-dwarf pulsars7 and white-dwarf binary systems with low-mass companions8.
By Ziteng Wang, Nanda Rea, DAVID KAPLAN, Emil Lenc, Zorawar Wadiasingh, Andrew Zic, Apurba Kumar Bera, Paz Beniamini, A. J. Cooper, Tracy Clarke, J. R. Dawson, Marcin Glowacki, Natasha Hurley-Walker, S. J. McSweeney, Emil J. Polisensky, Wendy Peters, George Abi Younes, Keith Bannister, Manisha Caleb, Clancy W. James, Mansi Kasliwal, Kaya Mori, Stella Ocker, Miguel Pérez-Torres, Hao Qiu, Kovi Rose, Ryan Shannon, Fayin Wang, Yuanming Wang, Zhenyin Zhao, Laura N. Driessen, Tara Murphy, Joscha N. Jahns-Schindler
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Nature
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Bow shock and Local Bubble plasma unveiled by the scintillating millisecond pulsar J0437−4715 - Nature Astronomy
Abstract The ionized interstellar medium contains astronomical-unit-scale (and below) structures that scatter radio waves from pulsars, resulting in scintillation. Power spectral analysis of scintillation often shows parabolic arcs, with curvatures that encode the locations and kinematics of the pulsar, Earth and interstellar plasma.
Preferential occurrence of fast radio bursts in massive star-forming galaxies - Nature
Abstract Fast radio bursts (FRBs) are millisecond-duration events detected from beyond the Milky Way. FRB emission characteristics favour highly magnetized neutron stars, or magnetars, as the sources1, as evidenced by FRB-like bursts from a galactic magnetar2,3, and the star-forming nature of FRB host galaxies4,5. However, the processes that produce FRB sources remain unknown6.
Voyager 1 hears the hush of interstellar plasma
The discovery of persistent plasma waves by Voyager 1 opens a new avenue to study structure in the nearby interstellar medium from sub-AU to tens of AU scales. Published May 10, 2021 Almost 11 years ago, Voyager 1 crossed an unprecedented boundary: it became the first human-made object to enter interstellar space.
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