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By NASA
Phil Kaaret (ST12) is lead author on the paper which describes Chandra X-ray Observatory observations of the galaxy NGC 2366. Escape of Lyman continuum (LyC) emission from galaxies found in the early universe was essential for the reionization of the universe when the intergalactic medium (IGM) changed from being neutral gas to the ionized IGM that we observe today. Compact emission-line galaxies (LCGs) are the most abundant class of confirmed Lyman continuum (LyC) emitters and provide (relatively) nearby analogs of the galaxies found in the early universe. An optical integral field study of NGC 2366 revealed an outflow originating at a star cluster known as “knot B” that is thought to clear a channel via mechanical feedback that enables LyC escape. We observed NGC 2366 with the Chandra and detected X-ray emission from a point source coincident with the apex of the outflow at knot B. The pointlike nature and variability of the X-ray emission suggests accretion onto a compact object in an X-ray binary. The accretion could produce sufficient kinetic energy to power the outflow. Thus, outflows from X-ray binaries may be important in enabling LyC emission from galaxies.
Read more at: https://arxiv.org/abs/2405.13192.
Illustration of ChandraView the full article
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By NASA
Alphonse Sterling (ST13) is co-author on a paper describing CMEs that appear to be initiated by a series of recurrent coronal jets. The paper is entitled: “Source Region and Launch Characteristics of Magnetic-arch-blowout Solar Coronal Mass Ejections Driven by Homologous Compact-flare Blowout Jets.” It is led by Binal Patel, a graduate student of Sterling’s colleague in India, Bhuwan Joshi; Ronald Moore of UAH is also a co-author. The paper will appear in ApJ shortly, and a preprint is available at https://arxiv.org/pdf/2405.03292.
Pre-eruptive coronal magnetic field configurations of the source region obtained from the NLFFF extrapolations using HMI vector magnetograms before events I–IV. We show the flux rope in blue color in each panel. The source region consists of closed bipolar field lines (green), which constrain the underlying flux rope. The flux rope is formed between emerging negative flux (NE ) and positive polarity flux (P2) in the leading part of the AR. The red circles mark the southeastern footpoint location of the flux rope in each panel, which is rooted in the rapidly changing NE region. (a2)–(d2) The flux ropes are shown from side views before events I–IV. (a3)–(d3) An AIA 304 Å image before the respective event is plotted in the background of the flux ropes.View the full article
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By NASA
On 3/7/24, Astrophysical Journal published online “X-ray Polarimetry of the Dipping Accreting Neutron Star 4U 1624–49” by M. Lynne Saade (Astrophysics Branch) et al. This is the 51st discovery paper published by the IXPE Science Team. The first author, Lynnie Saade, is a new postdoc working on IXPE and this is her first IXPE paper, which was submitted only a few months after arriving at MSFC.
Illustration of the Imaging X-ray Polarimetry ExplorerView the full article
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By NASA
As part of his NASA SERVIR research project, Pontus Olofsson (ST11) co-authored a paper for publication in IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. The paper, titled Applications of Remote Sensing for Land Use Planning Scenarios With Suitability Analysis, presents results from a suitability analysis model using time series of Landsat data for land use planning in West Africa in light of a growing population and management of natural resources. The research was carried out by SERVIR-funded research groups at NASA MSFC, University of Florida, and Boston University. The paper is available here: https://ieeexplore.ieee.org/document/10449341.
Results from the land use suitability analyses for (a) agriculture, (b) forest, and (c) urban land uses.View the full article
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By NASA
NASA has named three students the winners of the Artemis Moon Pod Essay Contest for their creative visions of a pioneering journey to the Moon. Nearly
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