Results 121 to 130 of about 78,490 (277)
On the Extended Soft X-Ray and Fe Kα Emission in NGC 1068
The Astrophysical JournalThe soft X-ray excess and Fe K α emission lines are widely observed in Seyfert galaxies, with their origin still in debate. We present a detailed spatially resolved image and spectral analysis of the Seyfert 2 galaxy NGC 1068 using high-resolution ...
Songbo Gao, Hongxing Yin, Shaoming Hu
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Proton‐linked effects on the axial coordination in ferric and ferrous horse heart cytochrome c
Protein Science, Volume 34, Issue 11, November 2025.Abstract The effect of pH (between pH 7.0 and 0.0) on the spectroscopic properties of ferric and ferrous derivatives of horse heart cytochrome c (hhcytc‐Fe(III) and hhcytc‐Fe(II), respectively) in 1.0M phosphate buffer is reported. This study further deepens the investigation of spectroscopic properties of a heme‐protein to very low pH (i.e., pH ≈ 0 ...
Federico Sebastiani +8 more
wiley +1 more source
The Astrophysical JournalTo facilitate new studies of galaxy-merger-driven fueling of active galactic nuclei (AGNs), we present a catalog of 387 AGNs that we have identified in the final population of over 10,000 z < 0.15 galaxies observed by the Sloan Digital Sky Survey-IV ...
Julia M. Comerford +9 more
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The problem of extinction and thermal reradiation by dust in active galactic nuclei and quasi-stellar objects [PDF]
, 1989 Charles E. Congdon, W. A. Stein
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Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.Abstract The production, attenuation, and absorption of secondary cosmic rays (SCR) are influenced by atmospheric parameters such as air pressure and temperature. To reliably correlate SCR flux measurements with atmospheric ionization driven by energetic particle precipitation, these dependencies must be quantified.
A. Al‐Qaaod +11 more
wiley +1 more source
JWST NIRCam Imaging of NGC 4258. I. Observation Overview
The Astrophysical JournalWe present James Webb Space Telescope (JWST) Near-Infrared Camera imaging of the nearby Seyfert 1.9 galaxy NGC 4258, which hosts strong star formation regions as well as an anomalous jet-like radio structure that extends through a significant portion of ...
Travis C. Fischer +5 more
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"Fermi" bubbles are bursting from our galaxy. Their origins remain a mystery. [PDF]
Proc Natl Acad Sci U S A, 2023 Mann A.
europepmc +1 more source
The environment of active galactic nuclei – I. A two-component broad emission line model [PDF]
, 1988 S. Collin-Souffrin +3 more
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Journal of Geophysical Research: Atmospheres, Volume 130, Issue 20, 28 October 2025.Abstract This study examined spatiotemporal variations in Beryllium‐7 (7Be) concentrations measured in surface air in high‐latitude regions of the Indian sector of the Southern Ocean, including two Japanese coastal stations. The sites included Syowa Station (69°00′S, 39°35′E) and site S17 (69°02′S, 40°05′E) on the coastal Antarctic ice sheet ...
Naohiko Hirasawa +5 more
wiley +1 more source
On the Extremely X-Ray Variable Active Galactic Nuclei in the XMM-LSS Field
The Astrophysical JournalWe present a systematic investigation of extremely X-ray variable active galactic nuclei (AGNs) in the ≈5.3 deg ^2 XMM-SERVS XMM-LSS region. Eight variable AGNs are identified with rest-frame 2 keV flux density variability amplitudes around 6–12.
Zijian Zhang +5 more
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