The Elusive Active Nucleus of NGC 4945 [PDF]
, 2000 We present new HST NICMOS observations of NGC 4945, a starburst galaxy hosting a highly obscured active nucleus that is one of the brightest extragalactic sources at 100 keV.
Macchetto, F. +6 more
core +2 more sources
The Impact of the Sulfur Allotropes and Sulfur Hydrides on the Venus Cloud Chemistry
Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.Abstract Venus is home to vivid sulfur chemistry, with SO2 ${\text{SO}}_{2}$ as the major sulfur gas species and a global cloud layer between 47 and 70 km composed of H2SO4 ${\mathrm{H}}_{2}{\text{SO}}_{4}$ and H2 ${\mathrm{H}}_{2}$O. The chemistry in the clouds has been extensively studied with 1D models, but none is able to reproduce the three orders
Maxence Lefèvre +6 more
wiley +1 more source
Active Galactic Nucleus Disks as Supernova Mufflers. I. Three-dimensional Local Hydrodynamic Models
The Astrophysical JournalSupernova (SN) shocks that originate from stars on orbits embedded in dense active galactic nucleus (AGN) accretion disks evolve differently from those that occur in the interstellar medium.
Harrison E. Cook +4 more
doaj +1 more source
ACTIVE GALACTIC NUCLEUS FEEDBACK IN THE HOT HALO OF NGC 4649
The Astrophysical Journal, 2014 Using the deepest available Chandra observations of NGC 4649, we find strong evidences of cavities, ripples, and ring-like structures in the hot interstellar medium that appear to be morphologically related with the central radio emission. These structures show no significant temperature variations in correspondence with higher pressure regions (0.5 ...
Paggi, Alessandro +6 more
openaire +3 more sources
The DELVE Quadruple Quasar Search. I. A Lensed Low-luminosity Active Galactic Nucleus
The Astronomical JournalA quadruply lensed source, J125856.3–031944, has been discovered using the DELVE survey and Wide-field Infrared Survey Explorer W1–W2 colors. Follow-up direct imaging carried out with the Magellan Baade 6.5 m telescope is analyzed, as is spectroscopy ...
Paul L. Schechter +27 more
doaj +1 more source
XMM-Newton Conclusively Identifies an Active Galactic Nucleus in a Green Pea Galaxy
The Astrophysical JournalGreen Pea galaxies are a class of compact, low-mass, low-metallicity star-forming galaxies in the relatively local Universe. They are believed to be analogs of high-redshift galaxies that reionized the Universe, and, indeed, the James Webb Space ...
Peter G. Boorman +25 more
doaj +1 more source
Dissecting Photometric Redshift for Active Galactic Nucleus Using XMM- and Chandra-COSMOS Samples [PDF]
, 2011 In this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of the Cosmic Evolution Survey (COSMOS) field. The availability of a large training set of spectroscopic redshifts that extends
Capak, P. +6 more
core
High-frequency Power Spectrum of Active Galactic Nucleus NGC 4051 Revealed by NICER
The Astrophysical Journal LettersVariability studies offer a compelling glimpse into black hole dynamics, and Neutron Star Interior Composition Explorer's (NICER’s) remarkable temporal resolution propels us even further.
B. Rani +8 more
doaj +1 more source
Active Galactic Nucleus Jet-inflated Bubbles as Possible Origin of Odd Radio Circles
The Astrophysical JournalOdd radio circles (ORCs) are newly discovered extragalactic radio objects with an unknown origin. In this work, we carry out three-dimensional cosmic-ray (CR) magnetohydrodynamic simulations using the FLASH code and predict the radio morphology of end-on
Yen-Hsing Lin, H.-Y. Karen Yang
doaj +1 more source
Quantifying the Active Galactic Nucleus Fraction in Cosmic Voids via Mid-infrared Variability
The Astrophysical JournalObservations and theoretical simulations suggest that the large-scale environment plays a significant role in how galaxies form and evolve and, in particular, whether and when galaxies host an actively accreting supermassive black hole in their center (i.
Anish S. Aradhey +3 more
doaj +1 more source