• Gauged U(1) extension of the standard model and phenomenology 

  Raut, Digesh (University of Alabama Libraries, 2018)

  Despite the tremendous success of the Standard Model (SM), it needs to be extended to explain the origin of cosmological inflation, dark matter (DM) and neutrino masses. We consider gauged U(1)x extended SM, where in ...
• Finding fossil galaxy system progenitors using strong gravitational lensing 

  Johnson, Lucas Edward (University of Alabama Libraries, 2018)

  Fossil galaxy systems have been described as some of the oldest systems in the universe, where the central galaxy has cannibalized most nearby member galaxies over cosmic time. While the progenitors to fossil systems have ...
• Simulating dwarf-dwarf galaxy flyby interactions 

  Timsina, Ashok (University of Alabama Libraries, 2018)

  This thesis presents the N-body simulation results for the interaction between two equal mass dwarf galaxies. We studied how flyby interactions can cause a different level of disturbance on the dwarf galaxies with the help ...
• Using Strong Gravitational Lensing to Identify Fossil Group Progenitors 

  Johnson, Lucas E.; Irwin, Jimmy A.; Wong, Ka-Wah; Maksym, W. Peter; Dupke, Renato A.; Miller, Eric D.; Carrasco, Eleazar R.; White, Raymond E., III (2018-04-01)

  Fossil galaxy systems are classically thought to be the end result of galaxy group/cluster evolution, as galaxies experiencing dynamical friction sink to the center of the group potential and merge into a single, giant ...
• A luminous X-ray outburst from an intermediate-mass black hole in an off-centre star cluster 

  Lin, Dacheng; Strader, Jay; Carrasco, Eleazar R.; Page, Dany; Romanowsky, Aaron J.; Homan, Jeroen; Irwin, Jimmy A.; Remillard, Ronald A.; Godet, Olivier; Webb, Natalie A.; Baumgardt, Holger; Wijnands, Rudy; Barret, Didier; Duc, Pierre-Alain; Brodie, Jean P.; Gwyn, Stephen D. J. (2018-06-14)

  A unique signature for the presence of massive black holes in very dense stellar regions is occasional giant-amplitude outbursts of multi-wavelength radiation from tidal disruption and subsequent accretion of stars that ...
• Flows of X-ray Gas Reveal the Disruption of a Star by a Massive Black Hole 

  Miller, Jon M.; Kaastra, Jelle S.; Miller, M. Coleman; Reynolds, Mark T.; Brown, Gregory; Cenko, S. Bradley; Drake, Jeremy J.; Gezari, Suvi; Guillochon, James; Gultekin, Kayhan; Irwin, Jimmy A.; Levan, Andrew; Maitra, Dipankar; Maksym, W. Peter; Mushotzky, Richard; O’Brien, Paul; Paerels, Frits; de Plaa, Jelle; Ramirez-Ruiz, Enrico; Strohmayer, Tod; Tanvir, Nial (2018-04-02)

  Tidal forces close to massive black holes can violently disrupt stars that make a close approach. These extreme events are discovered via bright X-ray1,2,3,4 and optical/ultraviolet5,6 flares in galactic centres. Prior ...
• Ultraluminous X-ray bursts in two ultracompact companions to nearby elliptical galaxies 

  Irwin, Jimmy A.; Maksym, W. Peter; Sivakoff, Gregory R.; Romanowsky, Aaron J.; Lin, Dacheng; Speegle, Tyler; Prado, Ian; Mildebrath, David; Strader, Jay; Liu, Jifeng; Miller, Jon M. (2016-10-20)

  A flaring X-ray source was found near the galaxy NGC 4697 (ref. 1). Two brief flares were seen, separated by four years. During each flare, the flux increased by a factor of 90 on a timescale of about one minute. There is ...
• A Likely Decade-Long Sustained Tidal Disruption Event 

  Lin, Dacheng; Guillochon, James; Komossa, S.; Ramirez-Ruiz, Enrico; Irwin, Jimmy A.; Maksym, W. Peter; Grupe, Dirk; Godet, Olivier; Webb, Natalie A.; Barret, Didier; Zauderer, B. Ashley; Duc, Pierre-Alain; Carrasco, Eleazar R.; Gwyn, Stephen D. J. (2017-02-02)

  Multiwavelength flares from tidal disruption and accretion of stars can be used to find and study otherwise dormant massive black holes in galactic nuclei 1 . Previous well-monitored candidate flares were short-lived, with ...
• Large Decay of X-ray Flux in 2XMM J123103.2+110648: Evidence for a Tidal Disruption Event 

  Lin, Dacheng; Godet, Olivier; Ho, Luis C.; Barret, Didier; Webb, Natalie A.; Irwin, Jimmy A. (2017-02-24)

  The X-ray source 2XMM J123103.2+110648 was previously found to show pure thermal X-ray spectra and an ∼3.8 h periodicity in three XMM–Newton X-ray observations in 2003– 2005, and the optical spectrum of the host galaxy ...
• Multiwavelength Follow-up Observations of the Tidal Disruption Event Candidate 2XMMi J184725.1-631724 

  Lin, Dacheng; Strader, Jay; Carrasco, Eleazar R.; Godet, Olivier; Grupe, Dirk; Webb, Natalie A.; Barret, Didier; Irwin, Jimmy A. (2017-11-16)

  The ultrasoft X-ray flare 2XMMi J184725.1−631724 was serendipitously detected in two XMM–Newton observations in 2006 and 2007, with a peak luminosity of 6 × 1043 erg s−1. It was suggested to be a tidal disruption event ...
• The Multiwavelength Spectrum of NGC 3115: Hot Accretion Flow Properties 

  Almeida, Ivan; Nemmen, Rodrigo; Wong, Ka-Wah; Wu, Qingwen; Irwin, Jimmy A. (2018-01-15)

  NGC 3115 is the nearest galaxy hosting a billion solar mass black hole and is also a lowluminosity active galactic nucleus (LLAGN). X-ray observations of this LLAGN are able to spatially resolve the hot gas within the ...
• Gas Sloshing Regulates and Records the Evolution of the Fornax Cluster 

  Su, Yuanyuan; Nulsen, Paul E. J.; Kraft, Ralph P.; Roediger, Elke; ZuHone, John A.; Jones, Christine; Forman, William R.; Sheardown, Alex; Irwin, Jimmy A.; Randall, Scott W. (2017-12-10)

  We present results of a joint Chandra and XMM-Newton analysis of the Fornax Cluster, the nearest galaxy cluster in the southern sky. Signatures of merger-induced gas sloshing can be seen in the X-ray image. We identify ...
• Hard X-Ray Emission from the M87 AGN Detected with NuSTAR 

  Wong, Ka-Wah; Nemmen, Rodrigo S.; Irwin, Jimmy A.; Lin, Dacheng (2017-11-01)

  M87 hosts a 3–6 billion solar mass black hole with a remarkable relativistic jet that has been regularly monitored in radio to TeV bands. However, hard X-ray emission ≳10 keV, which would be expected to primarily come ...
• Buoyant AGN Bubbles in the Quasi-isothermal Potential of NGC 1399 

  Su, Yuanyuan; Nulsen, Paul E. J.; Kraft, Ralph P.; Forman, William R.; Jones, Christine; Irwin, Jimmy A.; Randall, Scott W.; Churazov, Eugene (2017-10-01)

  The Fornax Cluster is a low-mass cool-core galaxy cluster. We present a deep Chandra study of NGC 1399, the central dominant elliptical galaxy of Fornax. The cluster center harbors two symmetric X-ray cavities coincident with ...
• Suzaku X-ray Observations of the Nearest Non-Cool Core Cluster, Antlia: Dynamically Young but with Remarkably Relaxed Outskirts 

  Wong, Ka-Wah; Irwin, Jimmy A.; Wik, Daniel R.; Sun, Ming; Sarazin, Craig L.; Fujita, Yutaka; Reiprich, Thomas H. (2016-09-20)

  We present the results of seven Suzaku mosaic observations (>200 ks in total) of the nearest non-cool core cluster, the Antlia Cluster (or Group), beyond its degree-scale virial radius in its eastern direction. The temperature ...
• Discovery of the Candidate Off-nuclear Ultrasoft Hyper-luminous X-ray Source 3XMM J141711.1+522541 

  Lin, Dacheng; Carrasco, Eleazar R.; Webb, Natalie A.; Irwin, Jimmy A.; Dupke, Renato; Romanowsky, Aaron J.; Ramirez-Ruiz, Enrico; Strader, Jay; Homan, Jeroen; Barret, Didier; Godet, Olivier (2016-04-10)

  We report the discovery of an off-nuclear ultrasoft hyper-luminous X-ray source candidate 3XMM J141711.1+522541 in the inactive S0 galaxy SDSS J141711.07+522540.8 (z = 0.41827, dL = 2.3 Gpc) in the Extended Groth Strip. ...
• An Ultrasoft X-ray Flare from 3XMM J152130.7+074916: a Tidal Disruption Event Candidate 

  Lin, Dacheng; Maksym, Peter W.; Irwin, Jimmy A.; Komossa, S.; Webb, Natalie A.; Godet, Olivier; Barret, Didier; Grupe, Dirk; Gwyn, Stephen D. J. (2015-09-20)

  We report on the discovery of an ultrasoft X-ray transient source, 3XMM J152130.7+074916. It was serendipitously detected in an XMM-Newton observation on 2000 August 23, and its location is consistent with the center of ...
• Modification of the exchange bias effect by He ion irradiation 

  Mougin, A.; Mewes, T.; Lopusnik, R.; Jung, M.; Engel, D.; Ehresmann, A.; Schmoranzer, H.; Fassbender, J.; Hillebrands, B. (2000)
• Measurements of the exchange stiffness of YIG films using broadband ferromagnetic resonance techniques 

  Klinger, S.; Chumak, A. V.; Mewes, T.; Khodadadi, B.; Mewes, C.; Dubs, C.; Surzhenko, O.; Hillebrands, B.; Conca, A. (2015)
• Bulk Single Crystal-Like Structural and Magnetic Characteristics of Epitaxial Spinel Ferrite Thin Films with Elimination of Antiphase Boundaries 

  Singh, Amit V.; Khodadadi, Behrouz; Mohammadi, Jamileh Beik; Keshavarz, Sahar; Mewes, Tim; Negi, Devendra Singh; Datta, Ranjan; Galazka, Zbigniew; Uecker, Reinhard; Gupta, Arunava (2017)

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