Results 91 to 100 of about 53,302 (262)

A Relativistic Jet in the Radio-quiet Active Galactic Nucleus Mrk 110

The Astrophysical Journal Letters
We report the discovery of a relativistic jet in Mrk 110, a narrow-line Seyfert 1 galaxy historically classified as a radio-quiet active galactic nucleus (AGN).
Ailing Wang, Tao An, Kenneth I. Kellermann, Hua Feng, Emmanuel K. Bempong-Manful, Roland Timmerman, Shaoguang Guo   +6 more
doaj   +1 more source

NuSTAR OBSERVATIONS OF THE COMPTON-THICK ACTIVE GALACTIC NUCLEUS AND ULTRALUMINOUS X-RAY SOURCE CANDIDATE IN NGC 5643 [PDF]

, 2015
We present two Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the local Seyfert 2 active galactic nucleus (AGN) and an ultraluminous X-ray source (ULX) candidate in NGC 5643. Together with archival data from Chandra, XMM-Newton, and Swift-
A. Annuar, P. Gandhi, P. Gandhi, D. Alexander, G. Lansbury, P. Ar'evalo, D. Ballantyne, M. Baloković, F. Bauer, S. Boggs, W. Brandt, M. Brightman, F. Christensen, W. Craig, W. Craig, A. Moro, C. Hailey, F. Harrison, R. Hickox, G. Matt, S. Puccetti, C. Ricci, J. Rigby, D. Stern, D. Walton, L. Zappacosta, Will Zhang   +26 more
semanticscholar   +1 more source

Synthesis of Nucleoside Derivatives by Biomimetic Ester Migration

ChemBioChem, EarlyView.
In tRNA aminoacylated nucleosides represent the central transfer unit of amino acids. An occurring 2′‐3′‐transaminoacylation is biomimetically exploited to successfully synthesize nucleosidic acid esters. This approach can be further expanded on sulfonic acid esters, which has the potential of a broad range of stereo‐ and regio‐controlled modifications
Nathalie J. Kurrle, Christoph J. B. Seifert, Nathalie Hampel, Tamara Rauch, Michael Thoma, Luca V. Parziale, Marian S. R. Ebeling, Dino Berthold, Oliver Trapp   +8 more
wiley   +1 more source

Tracking X-Ray Variability in Next-generation EHT Low-luminosity Active Galactic Nucleus Targets

The Astrophysical Journal
We present a 5 month NICER X-ray monitoring campaign for two low-luminosity active galactic nuclei (LLAGNs)—NGC 4594 and IC 1459—with complementary Swift and NuSTAR observations.
Nicole M. Ford, Michael Nowak, Venkatessh Ramakrishnan, Daryl Haggard, Kristen Dage, Dhanya G. Nair, Chi-kwan Chan   +6 more
doaj   +1 more source

How Quasar Feedback May Shape the Co-evolutionary Paths

Frontiers in Astronomy and Space Sciences, 2017
Observations point toward some form of “co-evolutionary sequence,” from dust-enshrouded starbursts to luminous unobscured quasars. Active galactic nucleus (AGN) feedback is generally invoked to expel the obscuring dusty gas in a blow-out event ...
Wako Ishibashi
doaj   +1 more source

Galaxy Zoo: the effect of bar-driven fuelling on the presence of an active galactic nucleus in disc galaxies [PDF]

, 2015
We study the influence of the presence of a strong bar in disc galaxies which host an active galactic nucleus (AGN). Using data from the Sloan Digital Sky Survey and morphological classificationsfromtheGalaxyZoo2project,wecreateavolume ...
Melanie A. Galloway, K. Willett, L. Fortson, C. Cardamone, K. Schawinski, Edmond Cheung, C. Lintott, K. Masters, T. Melvin, B. Simmons   +9 more
semanticscholar   +1 more source

Effect of Background Magnetic Field on Ion Weibel Instability With High‐Intensity Short‐Pulse Lasers

Contributions to Plasma Physics, EarlyView.
ABSTRACT The effect of finite background magnetic field on magnetic field amplification by Weibel instability using high‐intensity short‐pulse lasers is investigated. We consider Weibel instability for counter‐streaming sub‐relativistic plasma flows generated by shooting pure carbon targets with short‐pulse lasers.
Taiki Jikei, Takanobu Amano, Yosuke Matsumoto, Yasuhiro Kuramitsu   +3 more
wiley   +1 more source

RESOLVING THE ACTIVE GALACTIC NUCLEUS AND HOST EMISSION IN THE MID-INFRARED USING A MODEL-INDEPENDENT SPECTRAL DECOMPOSITION [PDF]

, 2015
We present results on the spectral decomposition of 118 Spitzer Infrared Spectrograph (IRS) spectra from local active galactic nuclei (AGNs) using a large set of Spitzer/IRS spectra as templates.
A. Hernán-Caballero, A. Alonso-Herrero, E. Hatziminaoglou, H. Spoon, C. R. Almeida, Tanio Díaz Santos, S. Hönig, O. González-Martín, P. Esquej   +8 more
semanticscholar   +1 more source

ATAC‐seq in Emerging Model Organisms: Challenges and Strategies

Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, EarlyView.
Principle of ATAC‐seq (left), overview of arthropod species with published ATAC‐seq data (middle), summary of experimental design (right). ABSTRACT The Assay for Transposase‐Accessible Chromatin with sequencing (ATAC‐seq) is a versatile and widely utilized method for identifying potential regulatory regions, such as promoters and enhancers, within a ...
Duğçar Ebrar Erdoğan, Shadi Karimifard, Mozhgan Khodadadi, Liucong Ling, Luisa Linke, Ana Catalán, Vincent Doublet, Amanda Glaser‐Schmitt, Oliver Niehuis, Katja Nowick, Antonella Soro, Natascha Turetzek, Barbara Feldmeyer, Nico Posnien   +13 more
wiley   +1 more source

Star formation history in barred spiral galaxies – active galactic nucleus feedback [PDF]

, 2017
We present a numerical study of the impact of AGN accretion and feedback on the star formation history of barred disc galaxies. Our goal is to determine whether the effect of feedback is positive (enhanced star formation) or negative (quenched star ...
Fidèle Robichaud, D. Williamson, H. Martel, D. Kawata, S. Ellison   +4 more
semanticscholar   +1 more source