Recent Submissions

  • Confident detection of doubly ionized thorium in the extreme Ap star CPD-62° 2717 

    Chojnowski, S Drew; Hubrig, Swetlana; Nidever, David L; Niemczura, Ewa; Labadie-Bartz, Jonathan; Mathys, Gautier; Hasselquist, Sten (Oxford University Press, 2023-05)
    Despite the Universe containing primordial thorium (Th) of sufficient abundance to appear in stellar spectra, detection of Th has to date been tentative and based on just a few weak and blended lines. Here, we present ...
  • The Role of Magnetic Shear in Reconnection-Driven Flare Energy Release 

    Qiu, J.; Alaoui, M.; Antiochos, S. K.; Dahlin, J. T.; Swisdak, M.; Drake, J. F.; Robison, A.; DeVore, C. R.; Uritsky, V. M. (Cornell University, 2023-08)
    Using observations from the Solar Dynamics Observatory's Atmosphere Imaging Assembly and the Ramaty High Energy Solar Spectroscopic Imager, we present novel measurements of the shear of post-reconnection flare loops (PRFLs) ...
  • Origins of the Evil Eye: M64's Stellar Halo Reveals the Recent Accretion of an SMC-mass Satellite 

    Smercina, Adam; Bell, Eric F.; Price, Paul A.; Bailin, Jeremy; Dalcanton, Julianne J.; de Jong, Roelof S.; D’Souza, Richard; Gozman, Katya; Jang, In Sung; Monachesi, Antonela; Nidever, David; Slater, Colin T. (American Astronomical Society, 2023-06)
    M64, often called the "Evil Eye" galaxy, is unique among local galaxies. Beyond its dramatic, dusty nucleus, it also hosts an outer gas disk that counter-rotates relative to its stars. The mass of this outer disk is ...
  • JWST’s PEARLS: TN J1338–1942 – I. Extreme jet-triggered star formation in a z = 4.11 luminous radio galaxy 

    Duncan, Kenneth J; Windhorst, Rogier A; Koekemoer, Anton M; Röttgering, Huub J A; Cohen, Jansen; Summers, Jake; Tompkins, Scott; Hutchison, Taylor A; Conselice, Christopher J; Driver, Simon P; Yan, Haojing; Adams, Nathan J; Cheng, Cheng; Coe, Dan; Diego, Jose M; Dole, Hervé; Frye, Brenda; Gim, Hansung B; Grogin, Norman A; Holwerda, Benne W; Lim, Jeremy; Marshall, Madeline A; Nonino, Mario; Pirzkal, Nor; Robotham, Aaron; Ryan, Russell E; Willmer, Christopher N A (Oxford University Press, 2023-04)
    We present the first JWST observations of the z = 4.11 luminous radio galaxy TN J1338–1942, obtained as part of the ‘Prime Extragalactic Areas for Reionization and Lensing Science’ (‘PEARLS’) project. Our NIRCam observations, ...
  • Structure of the Plasma near the Heliospheric Current Sheet as Seen by WISPR/Parker Solar Probe from inside the Streamer Belt 

    Liewer, Paulett C.; Vourlidas, Angelos; Stenborg, Guillermo; Howard, Russell A.; Qiu, Jiong; Penteado, Paulo; Panasenco, Olga; Braga, Carlos R. (IOP Publising, 2023-05)
    Parker Solar Probe (PSP) crossed the heliospheric current sheet (HCS) near the perihelion on encounters E8 and E11, enabling the Wide-field Imager for Solar Probe (WISPR) to image the streamer belt plasma in high resolution ...
  • The Imprint of Clump Formation at High Redshift. II. The Chemistry of the Bulge 

    Debattista, Victor P.; Liddicott, David J.; Gonzalez, Oscar A.; Beraldo e Silva, Leandro; Amarante, João A. S.; Lazar, Ilin; Zoccali, Manuela; Valenti, Elena; Fisher, Deanne B.; Khachaturyants, Tigran; Nidever, David L.; Quinn, Thomas R.; Du, Min; Kassin, Susan (American Astronomical Society, 2023-04)
    In Paper I, we showed that clumps in high-redshift galaxies, having a high star formation rate density (ΣSFR), produce disks with two tracks in the [Fe/H]–[α/Fe] chemical space, similar to that of the Milky Way's (MW's) ...
  • Ambipolar Heating of Magnetars 

    Tsuruta, Sachiko; Kelly, Madeline J.; Nomoto, Ken’ichi; Mori, Kanji; Teter, Marcus; Liebmann, Andrew C. (American Astronomical Society, 2023-03)
    Magnetars, neutron stars thought to be with ultrastrong magnetic fields of 1014–15 G, are observed to be much hotter than ordinary pulsars with ∼1012 G, and additional heating sources are required. One possibility is heating ...
  • NuSTAR Observations of a Heavily X-Ray-obscured AGN in the Dwarf Galaxy J144013+024744 

    Ansh, Shrey; Chen, Chien-Ting J.; Brandt, W. N.; Hood, Carol E.; Kammoun, E. S.; Lansbury, G.; Paltani, Stéphane; Reines, Amy E.; Ricci, C.; Swartz, Douglas A.; Trump, Jonathan R.; Vito, F.; Hickox, Ryan C. (American Astronomical Society, 2023-01)
    We present a multiwavelength analysis of the dwarf Seyfert 2 galaxy J144013+024744, a candidate obscured active galactic nucleus (AGN) thought to be powered by an intermediate-mass black hole (IMBH, M • ≈ 104−106 M ⊙) of ...
  • Multiwavelength scrutiny of X-ray sources in dwarf galaxies: ULXs versus AGNs 

    Thygesen, Erica; Plotkin, Richard M; Soria, Roberto; Reines, Amy E; Greene, Jenny E; Anderson, Gemma E; Baldassare, Vivienne F; Owens, Milo G; Urquhart, Ryan T; Gallo, Elena; Miller-Jones, James C A; Paul, Jeremiah D; Rollings, Alexandar P (Oxford University Press, 2023-01)
    Owing to their quiet evolutionary histories, nearby dwarf galaxies (stellar masses M⋆≲3×109M⊙⁠) have the potential to teach us about the mechanism(s) that ‘seeded’ the growth of supermassive black holes, and also how the ...
  • Auger electron spectroscopy mapping of lithium niobate ferroelectric domains with nano-scale resolution 

    McLoughlin, Torrey; Babbitt, Wm. Randall; Nakagawa, Wataru (Optica Publishing Group, 2022-12)
    The +/−Z ferroelectric domains in periodically poled lithium niobate are characterized with Auger electron spectroscopy. The -Z domains have a higher Auger O-KLL transition amplitude than the +Z domains. Based on this, ...
  • First Flight of the EUV Snapshot Imaging Spectrograph (ESIS) 

    Parker, Jacob D.; Smart, Roy T.; Kankelborg, Charles; Winebarger, Amy; Goldsworth, Nelson (American Astronomical Society, 2022-10)
    The Extreme-ultraviolet Snapshot Imaging Spectrograph (ESIS) launched on a sounding rocket from White Sands Missile Range on 2019 September 30. ESIS is a computed tomography imaging spectrograph (CTIS) designed to map ...
  • Intermediate-mass black holes and the Fundamental Plane of black hole accretion 

    Gültekin, Kayhan; Nyland, Kristina; Gray, Nichole; Fehmer, Greg; Huang, Tianchi; Sparkman, Matthew; Reines, Amy E; Greene, Jenny E; Cackett, Edward M; Baldassare, Vivienne (Oxford University Press, 2022-09)
    We present new 5 GHz Very Large Array observations of a sample of eight active intermediate-mass black holes with masses 104.9 M⊙ < M < 106.1 M⊙ found in galaxies with stellar masses M* < 3 × 109 M⊙. We detected five of ...
  • Extracting the Heliographic Coordinates of Coronal Rays Using Images from WISPR/Parker Solar Probe 

    Liewer, P. C.; Qiu, J.; Ark, F.; Penteado, P.; Stenborg, G.; Vourlidas, A.; Hall, J. R.; Riley, P. (Springer Science and Business Media LLC, 2022-09)
    The Wide-field Imager for Solar Probe (WISPR) onboard Parker Solar Probe (PSP), observing in white light, has a fixed angular field of view, extending from 13.5∘ to 108∘ from the Sun and approximately 50∘ in the transverse ...
  • Nano-scale ferroelectric domain differentiation in periodically poled lithium niobate with auger electron spectroscopy 

    McLoughlin, Torrey; Babbitt, Wm. Randall; Nakagawa, Wataru (Optica Publishing Group, 2022-03)
    A new method for characterizing lithium niobate +/-Z ferroelectric polarization domains using Auger electron spectroscopy (AES) is presented. The domains of periodically poled samples are found to be differentiable using ...
  • Hundreds of Low-mass Active Galaxies in the Galaxy And Mass Assembly (GAMA) Survey 

    Salehirad, Sheyda; Reines, Amy E.; Molina, Mallory (American Astronomical Society, 2022-09)
    We present an entirely new sample of 388 low-mass galaxies (M ⋆ ≤ 1010 M ⊙) that have spectroscopic signatures indicating the presence of massive black holes (BHs) in the form of active galactic nuclei (AGNs) or tidal ...
  • Determining the Spectral Content of MOSES Images 

    Parker, Jacob D.; Kankelborg, Charles C (American Astronomical Society, 2022-06)
    The Multi-Order Solar Extreme Ultraviolet Spectrograph (MOSES) sounding rocket was launched from White Sands Missile Range on 2006 February 8th, to capture images of the Sun in the He ii 303.8 Å emission line. MOSES is a ...
  • Wandering Black Hole Candidates in Dwarf Galaxies at VLBI Resolution 

    Sargent, Andrew J.; Johnson, Megan C.; Reines, Amy E.; Secrest, Nathan J.; van der Horst, Alexander J.; Cigan, Phil J.; Darling, Jeremy; Greene, Jenny E. (American Astronomical Society, 2022-07)
    Thirteen dwarf galaxies have recently been found to host radio-selected accreting massive black hole (MBH) candidates, some of which are “wandering” in the outskirts of their hosts. We present 9 GHz Very Long Baseline Array ...
  • Fossil turtle eggs from the Upper Cretaceous Gaogou Formation, Xiaguan-Gaoqiu Basin, Neixiang County, Henan Province, China: Interpretation of the transformation from aragonite to calcite in fossil turtle eggshell 

    Xu, Li; Xie, Junfang; Zhang, Shukang; Choi, Seung; Kim, Noe-Heon; Gao, Diansong; Jin, Xingsheng; Jia, Songhai; Gao, Yongli (Elsevier BV, 2022-06)
    In 2007, a clutch of approximately 30 fossil eggs reported from the Upper Cretaceous Gaogou Formation, Xiaguan-Gaoqiu Basin, Neixiang County, Henan Province, China was assigned to the oofamily “Crocodiloolithidae”. After ...
  • Environmental Factors Affecting Feather Taphonomy 

    Schweitzer, Mary Higby; Zheng, Wenxia; Equall, Nancy (MDPI AG, 2022-05)
    The exceptional preservation of feathers in the fossil record has led to a better understanding of both phylogeny and evolution. Here we address factors that may have contributed to the preservation of feathers in ancient ...
  • Thermal transport in two-dimensional nematic superconductors 

    Choudhury, Sourav Sen; Peterson, Sean; Idzerda, Yves (American Physical Society, 2022-06)
    We study the thermal transport in a two-dimensional system with coexisting superconducting (SC) and nematic orders. We analyze the nature of the coexistence phase in a tight-binding square lattice where the nematic state ...

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