Results 131 to 140 of about 238,671 (290)

Starburst Clusters in Galactic Nuclei [PDF]

arXiv, 2000
Galactic nuclei often harbor a disproportionately large amount of star formation activity with respect to their surrounding disks. Not coincidentally, the density of molecular material in galactic nuclei is often also much greater than that in disks (Table 1 in Kennicutt 1998).
arxiv  

A Small Pathbreaking Spacecraft: Giants of Space Research (Bernard Blake, Dieter Hovestadt, and Edward Stone)

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
wiley   +1 more source

X-Ray Polarization Variability of High Spectral Peak BL Lacertaes: Cases of 1ES 1959+650 and PKS 2155–304

The Astrophysical Journal Letters
The high-energy-peaked BL Lacertae objects (HBLs) are the main targets of the Imaging X-ray Polarimetry Explorer (IXPE) for investigating the mechanisms of radiation and particle acceleration in jets. In this Letter, we report the first IXPE observations
Xin-Ke Hu, Yu-Wei Yu, Jin Zhang, Tan-Zheng Wu, Ji-Shun Lian, Xiang-Gao Wang, Hai-Ming Zhang, En-Wei Liang   +7 more
doaj   +1 more source

The Black Hole-Host Galaxy Relation in Active Galactic Nuclei [PDF]

arXiv, 2000
The masses of the central black holes of Active Galactic Nuclei estimated by the reverberation virial technique seem to be significantly smaller than predicted from the black hole mass-bulge luminosity relation for massive black holes detected by kinematic methods in less active and normal galaxies.
arxiv  

Human γδ T Cell Function Is Impaired Upon Mevalonate Pathway Inhibition

Immunology, Volume 175, Issue 3, Page 300-322, July 2025.
Mevalonate pathway is important for the effector function of gammadelta T cells. Inhibition of the pathway in vivo and in vitro impairs cytokine and cytotoxic molecule production by mainly affecting protein prenylation and disturbing intracellular signalling in Vdelta2 T cells. Created with Biorender.
Tsz Kin Suen, Burcu Al, Thomas Ulas, Nico Reusch, Harsh Bahrar, Siroon Bekkering, Jaydeep Bhat, Dieter Kabelitz, Joachim L. Schultze, Frank L. van de Veerdonk, Jeanine Roeters van Lennep, Niels P. Riksen, Leo A. B. Joosten, Mihai G. Netea, Katarzyna Placek   +14 more
wiley   +1 more source

A Long-term Study of Mrk 50: Appearance and Disappearance of Soft Excess

The Astrophysical Journal
We present an extensive temporal and spectral study of the Seyfert 1 AGN Mrk 50 using 15 yr (2007–2022) of multiwavelength observations from XMM-Newton, Swift, and NuSTAR for the first time.
Narendranath Layek, Prantik Nandi, Sachindra Naik, Arghajit Jana   +3 more
doaj   +1 more source

Light Quantity Impacts Early Response to Cold and Cold Acclimation in Young Leaves of Arabidopsis

Plant, Cell &Environment, Volume 48, Issue 7, Page 5030-5052, July 2025.
ABSTRACT Plant reactions to stress vary with development stage and fitness. This study assessed the relationship between light and chilling stress in Arabidopsis acclimation. By analysing the transcriptome and proteome responses of expanding leaves subjected to varying light intensity and cold, 2251 and 2064 early response genes and proteins were ...
Markéta Luklová, Marieke Dubois, Michaela Kameniarová, Klára Plačková, Jan Novák, Romana Kopecká, Michal Karady, Jaroslav Pavlů, Jan Skalák, Sunita Jindal, Ljiljana Tubić, Zainab Quddoos, Ondřej Novák, Dirk Inzé, Martin Černý   +14 more
wiley   +1 more source

An Excess of Active Galactic Nuclei Triggered by Galaxy Mergers in MaNGA Galaxies of Stellar Mass ∼1011 M ⊙

The Astrophysical Journal
To 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, Rebecca Nevin, James Negus, R. Scott Barrows, Michael Eracleous, Francisco Müller-Sánchez, Namrata Roy, Aaron Stemo, Thaisa Storchi-Bergmann, Dominika Wylezalek   +9 more
doaj   +1 more source

Emission-Line versus Continuum Correlations in Active Galactic Nuclei [PDF]

arXiv, 2006
The Baldwin Effect, a negative correlation between emission-line equivalent width and luminosity in active galactic nuclei, is still of interest as a diagnostic of accretion physics nearly thirty years after its discovery. This review examines recent developments in the study of correlations between line and continuum emission in AGNs, as measured both
arxiv  

Megamasers in Active Galactic Nuclei [PDF]

Highlights of Astronomy, 1998
Extragalactic masers were discovered more than 20 years ago (Whiteoak & Gardner 1973). It soon became apparent that those extragalactic masers we can detect are intrinsically very powerful and are located in galactic nuclei. The term Megamaser was coined to describe the most luminous OH masers, which are a million times more powerful than any OH ...
openaire   +2 more sources