Results 21 to 30 of about 74,488 (217)

VARIABILITY OF ACTIVE GALACTIC NUCLEI [PDF]

, 2001
Continuum and emission-line variability of active galactic nuclei provides a powerful probe of microarcsecond scale structures in the central regions of these sources. In this contribution, we review basic concepts and methodologies used in analyzing AGN variability.
openaire   +2 more sources

Broad iron lines in Active Galactic Nuclei [PDF]

, 2000
An intrinsically narrow line emitted by an accretion disk around a black hole appears broadened and skewed as a result of the Doppler effect and gravitational redshift.
A. J. Young, Antonucci R., C. S. Reynolds, Dabrowski Y., Fabian A. C., Fabian A. C., Fanton C., George I. M., Ghisellini G., Gierlinski M., Grandi P., Guainazzi M., Guainazzi M., Guilbert P. W., Iwasawa K., Iwasawa K., K. Iwasawa, Kormendy J., Makishima K., Martocchia A., Matt G., Matt G., Matt G., Matt G., Mushotzky R. F., Nandra K., Nandra K., Nishiura S., Otani C., Revnivtsev M., Reynolds C. S., Reynolds C. S., Reynolds C. S., Ross R. R., Ross R. R., Shakura N. L., Vainshtein L. A., Zdziarski A. A.,  A. C. Fabian   +38 more
core   +3 more sources

NuSTAR Observations of a Heavily X-Ray-obscured AGN in the Dwarf Galaxy J144013+024744

The Astrophysical Journal, 2023
We present a multiwavelength analysis of the dwarf Seyfert 2 galaxy J144013+024744, a candidate obscured active galactic nucleus (AGN) thought to be powered by an intermediate-mass black hole (IMBH, M _• ≈ 10 ^4 −10 ^6 M _⊙ ) of mass M _• ∼ 10 ^5.2 M _⊙ .
Shrey Ansh, Chien-Ting J. Chen, W. N. Brandt, Carol E. Hood, E. S. Kammoun, G. Lansbury, Stéphane Paltani, Amy E. Reines, C. Ricci, Douglas A. Swartz, Jonathan R. Trump, F. Vito, Ryan C. Hickox   +12 more
doaj   +1 more source

Active Galactic Nuclei and Transformation of Dark Matter into Visible Matter

, 2009
The hypothesis that dark matter is converted into visible particles in active galactic nuclei is investigated. If dark matter consists of stable superheavy neutral particles and active galactic nuclei are rotating black holes, then, due to the Penrose ...
A. A. Grib, A. A. Grib, A. A. Grib, A. A. Grib, A. A. Grib, A. A. Grib, H. V. Klapdor-Kleingrothaus, J. F. Navarro, K. Greisen, L. H. Ford, M. Gell-Mann, S. Chandrasekhar, The Pierre Auger Collaboration, V. K. Dubrovich, Ya. B. Zel’dovich, Yu. V. Pavlov   +15 more
core   +1 more source

Mid-infrared Properties of Narrow-line Seyfert 1 Galaxies Detected by LoTSS DR2

The Astrophysical Journal
Narrow-line Seyfert 1 galaxies (NLS1s), a subclass of active galactic nuclei (AGNs) in an early stage of the accretion process, are also found to host relativistic jets. However, currently known jetted NLS1s are rare. The majority of NLS1s are undetected
Xu-Liang Fan
doaj   +1 more source

Liquid Metal Nanotransformers for Drug‐Resistant Pan‐Cancer Therapy in Patient‐Derived Organoids

Advanced Science, EarlyView.
Pan‐cancer therapies are severely limited in drug‐resistance patients due to genetic mutations and other factors, resulting in poor therapeutic outcomes and constrained clinical benefit. Liquid metal nanotransformers, a new class of shape‐transformable nanomaterials capable of dramatic morphological changes, offer a promising physical strategy to ...
Xiaojie Yuan, Xuelin Wang, Zhongyao Chen, Shuo Wang, Weining Gao, Ziyi Chen, Runyang Li, Cheng Hao, Lei Zhang, Qiongqiong Zhang, Ke Zhang, Mei Yu, Qian Liu, Jingxuan Wang, Huiping Li, Simpkins Fiona, Jing Liu, Qiang Liu, Peng Liu, Yawei Hu   +19 more
wiley   +1 more source

Investigating Model Dependencies for Obscured Active Galactic Nuclei: A Case Study of NGC 3982

The Astrophysical Journal
X-ray spectroscopy of heavily obscured active galactic nuclei (AGN) offers a unique opportunity to study the circumnuclear environment of accreting supermassive black holes.
Kristína Kallová, Peter G. Boorman, Claudio Ricci   +2 more
doaj   +1 more source

A Circuit of Mechanically Regulated Transcription Factors Balances Regenerative and Fibrotic Memory of Mesenchymal Stromal Cells

Advanced Science, EarlyView.
Producing MSCs on rigid culture substrates induces a scar‐making phenotype, jeapordizing therapeutic success. ‘Tissue‐soft’ surfaces prevent MSC fibrogenesis and preserve regenerative traits. An epigenetic network, driven by HOXA11 and SALL1, maintains ‘soft memory’ by keeping chromatin open in relaxed MSCs, promoting anti‐fibrotic programs.
Fereshteh Sadat Younesi, Andrew E. Miller, Li Diao, Xinying Guo, Natalie Andonian, Elham Karimizadeh, Thomas H. Barker, Boris Hinz   +7 more
wiley   +1 more source

Cosmic rays from active galactic nuclei

, 2008
Cosmic ray (CR) acceleration at the shock created by the expanding cocoons around active galactic nuclei (AGNs) is studied. It is shown that above the energy $10^{18}$ eV the overall energy spectrum of CRs, produced during the AGN evolution and released ...
Bamba, Bell, Berezhko, Berezhko, Berezhko, E. G. Berezhko, Krymsky, Long, Milgrom, Niemiec, Rachen, Vink, Yamamoto   +12 more
core   +1 more source

Seedless One‐Pot Synthesis of Colloidal InAs Quantum Dots Enabling a High‐Accuracy Photoplethysmography Oximeter

Advanced Science, EarlyView.
A real‐time, non‐contact photoplethysmography (PPG) system based on InAs colloidal quantum dots (CQDs) synthesized via a seedless injection synthesis is demonstrated. The measured oxygen saturation shows considerable agreement with commercial PPG devices.
Beom Kwan Kim, Seungin Jee, Yongnam Ahn, In‐Suh Lee, Dongeon Kim, Seongchong Park, Yujin Jung, In‐Ho Bae, Se‐Woong Baek   +8 more
wiley   +1 more source