Results 71 to 80 of about 282 (177)

Thickness of Nanoscale Poly(Dimethylsiloxane) Layers Determines the Motion of Sliding Water Drops

Advanced Materials, Volume 36, Issue 29, July 18, 2024.
Polydimethylsiloxane brushes are extensively utilized in material applications as a hydrophobic coating due to the low liquid drop friction and high stability. However, the drop movements still vary depending on how it is prepared. In this work, the film thickness is proved to be a determinant for the water drop dynamic friction on such kind of a ...
Xiaoteng Zhou, Yongkang Wang, Xiaomei Li, Pranav Sudersan, Katrin Amann‐Winkel, Kaloian Koynov, Yuki Nagata, Rüdiger Berger, Hans‐Jürgen Butt   +8 more
wiley   +1 more source

Optical Variability of Blazars in the Tomo-e Gozen Northern Sky Transient Survey

The Astrophysical Journal
We studied the optical variability of 241 BL Lacertae (BL Lacs) and 83 flat-spectrum radio quasars (FSRQs) from the 4LAC catalog using data from the Tomo-e Gozen Northern Sky Transient Survey, with ∼50 epochs per blazar on average.
TianFang Zhang, Mamoru Doi, Mitsuru Kokubo, Shigeyuki Sako, Ryou Ohsawa, Nozomu Tominaga, Masaomi Tanaka, Yasushi Fukazawa, Hidenori Takahashi, Noriaki Arima, Naoto Kobayashi, Ko Arimatsu, Shin-ichiro Okumura, Sohei Kondo, Toshihiro Kasuga, Yuki Mori, Yuu Niino   +16 more
doaj   +1 more source

Jet collimation and acceleration in the flat spectrum radio quasar 1928+738

Astronomy & Astrophysics
Using time-resolved multifrequency Very Long Baseline Array data and new KaVA (KVN and VERA Array) observations, we study the structure and kinematics of the jet of the flat spectrum radio quasar (FSRQ) 1928+738. We find two distinct jet geometries as a function of distance from the central black hole, with the inner jet having a parabolic shape ...
Kunwoo Yi, Jongho Park, Masanori Nakamura, Kazuhiro Hada, Sascha Trippe   +4 more
openaire   +2 more sources

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí, Pedro L. Luque‐Escamilla, Benito Marcote, Daniel del Ser, Gustavo E. Romero, Cintia S. Peri   +5 more
wiley   +1 more source

Jets, black holes and disks in blazars

EPJ Web of Conferences, 2013
The Fermi and Swift satellites, together with ground based Cherenkov telescopes, has greatly improved our knowledge of blazars, namely Flat Spectrum Radio Quasars and BL Lac objects, since all but the most powerful emit most of their electro–magnetic ...
Ghisellini Gabriele
doaj   +1 more source

Cross‐Polarization Gain Calibration of Linearly Polarized VLBI Antennas by Observations of 4C 39.25

Radio Science, Volume 59, Issue 4, April 2024.
Abstract Radio telescopes with dual linearly polarized feeds regularly participate in Very Long Baseline Interferometry. One example is the VLBI Global Observing System (VGOS), which is employed for high‐precision geodesy and astrometry. In order to achieve the maximum signal‐to‐noise ratio, the visibilities of all four polarization products are ...
F. Jaron, I. Martí‐Vidal, M. Schartner, J. González‐García, E. Albentosa‐Ruiz, S. Bernhart, J. Böhm, J. Gruber, S. Modiri, A. Nothnagel, V. Pérez‐Díez, T. Savolainen, B. Soja, E. Varenius, M. H. Xu   +14 more
wiley   +1 more source

Jet Power Estimates of Flat-spectrum Radio Quasars PKS 1441+25 and Ton 599 from Broadband Spectral Energy Distribution Modeling

The Astrophysical Journal
Flat-spectrum radio quasars (FSRQs) are among the most energetic and powerful active galactic nuclei, often exhibiting jet powers comparable to or exceeding the Eddington luminosity.
Hritwik Bora, Ranjeev Misra, Rukaiya Khatoon, Rupjyoti Gogoi   +3 more
doaj   +1 more source

M_BH - sigma relation in SDSS flat-spectrum radio quasars

, 2009
6 pages, 4 figures, accepted to ...
Gu, Minfeng, Chen, Zhaoyu, Cao, Xinwu
openaire   +2 more sources

SMMAN: Quasi-simultaneous Multiwavelength Monitoring of Gamma-Ray-loud Active Galactic Nuclei with the Nanshan 26 m Radio Telescope

The Astrophysical Journal Supplement Series
Active galactic nuclei (AGNs) are characterized by strong temporal flux density variability across the electromagnetic spectrum, offering insights into the complex physical processes governing accretion and plasma outflows.
Lang Cui, Krishna Mohana A, Xin Wang, Ning Chang, Guiping Tan, Xiang Liu   +5 more
doaj   +1 more source