Showing 141 - 160 results of 207 for search '"galaxies"', query time: 0.05s Refine Results
  1. 141

    Exponential Self-Organization and Moore’s Law: Measures and Mechanisms by Georgi Yordanov Georgiev, Atanu Chatterjee, Germano Iannacchione

    Published 2017-01-01
    “…Examples are the formation of elementary particles from pure energy, the formation of atoms from particles, the formation of stars and galaxies, and the formation of molecules from atoms, of organisms, and of the society. …”
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  2. 142

    Inner radius and energy conditions of dark matter halos surrounding Schwarzschild black holes by Zibo Shen, Anzhong Wang, Shaoyu Yin

    Published 2025-03-01
    “…We study a class of analytic models for a dark matter halo surrounding a Schwarzschild black hole sitting at the center of a galaxy, with a variable inner radius rin at which the density profile of the dark matter halo vanishes. …”
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  3. 143

    Photometric Selection of Type 1 Quasars in the XMM-LSS Field with Machine Learning and the Disk–Corona Connection by Jian Huang, Bin Luo, W. N. Brandt, Ying Chen, Qingling Ni, Yongquan Xue, Zijian Zhang

    Published 2025-01-01
    “…We constructed our training and blind-test samples using spectroscopically identified Sloan Digital Sky Survey quasars, galaxies, and stars. We utilized the XGBoost machine learning method to select a total of 1591 quasars. …”
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  4. 144

    Scheduling in Targeted Transient Surveys and a New Telescope for CHASE by Francisco Förster, Nicolás López, José Maza, Petr Kubánek, G. Pignata

    Published 2010-01-01
    “…In particular, we present example schedules designed for a future 50 cm telescope that will expand the capabilities of the CHASE survey, which aims to detect young supernova events in nearby galaxies. We also include a brief description of the telescope and the status of the project, which is expected to enter a commissioning phase in 2010.…”
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  5. 145
  6. 146

    The Sunburst Arc with JWST. III. An Abundance of Direct Chemical Abundances by Brian Welch, T. Emil Rivera-Thorsen, Jane R. Rigby, Taylor A. Hutchison, Grace M. Olivier, Danielle A. Berg, Keren Sharon, Håkon Dahle, M. Riley Owens, Matthew B. Bayliss, Gourav Khullar, John Chisholm, Matthew Hayes, Keunho J. Kim

    Published 2025-01-01
    “…With these temperature and density measurements, we measure gas-phase abundances with similar rigor as studies of local galaxies and H ii regions. We measure a gas-phase metallicity for the LCE of $12+\mathrm{log}({\rm{O}}/{\rm{H}})=7.97\pm 0.05$ , and find an enhanced nitrogen abundance $\mathrm{log}({\rm{N}}/{\rm{O}})=-0.6{5}_{-0.25}^{+0.16}$ . …”
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  7. 147

    Nonthermal Signatures of Radiative Supernova Remnants. II. The Impact of Cosmic Rays and Magnetic Fields by Rebecca Diesing, Siddhartha Gupta

    Published 2025-01-01
    “…Understanding SNR evolution at this stage is crucial for estimating feedback in galaxies, as SNRs are expected to release energy and momentum into the interstellar medium near the ends of their lives. …”
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  8. 148

    Pre-trained artificial intelligence-aided analysis of nanoparticles using the segment anything model by Gabriel A. A. Monteiro, Bruno A. A. Monteiro, Jefersson A. dos Santos, Alexander Wittemann

    Published 2025-01-01
    “…Examples can be found in systems as diverse as galaxies, alloys, living tissues, cells, and even nanoparticles. …”
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  9. 149

    What Rogue Hydrogen Clouds Tell Us about Galactic Magnetic Fields by Bailey M. Forster, Tyler J. Foster, Roland Kothes, Alex S. Hill, Jo-Anne C. Brown

    Published 2025-01-01
    “…Observations of the Milky Way and external galaxies support the idea that large-scale magnetic fields are concentrated in galactic disks, with halo magnetic fields at least an order of magnitude weaker. …”
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  10. 150
  11. 151

    Looking at Infrared Background Radiation Anisotropies with Spitzer: Large-scale Anisotropies and Their Implications by A. Kashlinsky, Richard G. Arendt, M. L. N. Ashby, J. Kruk, N. Odegard

    Published 2025-01-01
    “…The power spectrum of the resultant CIB anisotropies is measured from the data to >1°, revealing the component well above that from remaining known galaxies on scales $\gt 1^{\prime} \rm{}\,\rm{}\,$ . …”
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  12. 152
  13. 153

    Geometrical Distances of Extragalactic Binaries through Spectroastrometry by Yu-Yang Songsheng, Jian-Min Wang, Yuan Cao, XueFei Chen, JianPing Xiong, Zhi-Xiang Zhang, Rong-Gen Cai

    Published 2025-01-01
    “…By measuring multiple binary star systems or monitoring one binary system repeatedly, geometric distance measurements of nearby galaxies can be achieved, providing valuable insights into the Hubble tension and advancing our understanding of the Universe’s structure and evolution.…”
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  14. 154

    The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release by Chenxu Liu, Karl Gebhardt, Erin Mentuch Cooper, Dustin Davis, Donald P. Schneider, Matt J. Jarvis, Daniel J. Farrow, Steven L. Finkelstein, Óscar A. Chávez Ortiz, The HETDEX Collaboration

    Published 2025-01-01
    “…A total of 4060 (39%) of the 10,499 redshift-confirmed AGN have emission-line regions 3 σ more extended than the image quality, which could be strong outflows blowing into the outskirts of the host galaxies or ionized intergalactic medium.…”
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  15. 155

    Excess Ultraviolet Emission at High Galactic Latitudes: A New Horizons View by Jayant Murthy, J. Michael Shull, Marc Postman, Joel Wm. Parker, Seth Redfield, Nathaniel Cunningham, G. Randall Gladstone, Jon P. Pineau, Pontus Brandt, Anne J. Verbiscer, Kelsi N. Singer, Harold A. Weaver, Richard C. Henry, S. Alan Stern

    Published 2025-01-01
    “…The former is the first firm detection of the offset in the range 912–1100 Å while the latter result confirms previous results from the Galaxy Evolution Explorer, showing that there is little emission from the solar system from 1400 to 1800 Å. …”
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  16. 156
  17. 157

    Broad-line Region Characterization in Dozens of Active Galactic Nuclei Using Small-aperture Telescopes by Catalina Sobrino Figaredo, Doron Chelouche, Martin Haas, Michael Ramolla, Shai Kaspi, Swayamtrupta Panda, Martin W. Ochmann, Shay Zucker, Rolf Chini, Malte A. Probst, Wolfram Kollatschny, Miguel Murphy

    Published 2025-01-01
    “…We present the results of a nearly decade-long photometric reverberation mapping (PRM) survey of the H α emission line in nearby (0.01 ≲ z ≲ 0.05) Seyfert galaxies using small (15–40 cm) telescopes. Broadband filters were used to trace the continuum emission, while narrowband filters tracked the H α -line signal. …”
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  18. 158

    Detecting the Black Hole Candidate Population in M51’s Young Massive Star Clusters: Constraints on Accreting Intermediate-mass Black Holes by Kristen C. Dage, Evangelia Tremou, Bolivia Cuevas Otahola, Eric W. Koch, Kwangmin Oh, Richard M. Plotkin, Vivian L. Tang, Muhammad Ridha Aldhalemi, Zainab Bustani, Mariam Ismail Fawaz, Hans J. Harff, Amna Khalyleh, Timothy McBride, Jesse Mason, Anthony Preston, Cortney Rinehart, Ethan Vinson, Gemma Anderson, Edward M. Cackett, Shih Ching Fu, Sebastian Kamann, Teresa Panurach, Renuka Pechetti, Payaswini Saikia, Susmita Sett, Ryan Urquhart, Christopher Usher

    Published 2025-01-01
    “…Jansky Very Large Array to search for any evidence of accreting black holes in young massive star clusters in the nearby galaxy M51. We find that of 44 bright ( L _X  > 10 ^38 erg s ^−1 ) X-ray point sources in M51, 24 had probable matches to objects including possible associated star clusters in the HST Legacy Extragalactic UV Survey catalog, seven of which were classified as contaminants (background galaxies or foreground stars). …”
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  19. 159

    Clustering of X-Ray-Selected AGN by N. Cappelluti, V. Allevato, A. Finoguenov

    Published 2012-01-01
    “…In particular, one of the key results is that X-ray AGNs are hosted by dark matter halos of mass similar to that of galaxy groups. This result, together with model predictions, has lead to the hypothesis that galaxy mergers may constitute the main AGN-triggering mechanism. …”
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  20. 160

    Testing General Relativity Using Large-scale Structure Photometric Redshift Surveys and the Cosmic Microwave Background Lensing Effect by Shang Li, Jun-Qing Xia

    Published 2025-01-01
    “…The E _G statistic provides a valuable tool for evaluating the predictions of general relativity (GR) by probing the relationship between gravitational potential and galaxy clustering on cosmological scales within the observable Universe. …”
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