Zobrazeno 1 - 10
of 194
pro vyhledávání: '"Readhead, Anthony"'
Autor:
Kiehlmann, Sebastian, De La Parra, Philipe Vergara, Sullivan, Andrew, Synani, A., Liodakis, Ioannis, Readhead, Anthony, Graham, Matthew, Begelman, Mitchell, Blandford, Roger, Chatziioannou, Katerina, Ding, Yuanze, Harrison, Fiona, Homan, D., Hovatta, Talvikki, Kulkarni, Shrinivas, Lister, Matthew, Maiolino, Roberto, Max-Moerbeck, Walter, Molina, B., Mroz, Przemyslaw, O'Dea, Christopher, Pavlidou, Vasiliki, Pearson, Timothy J., Aller, Margo, Lawrence, C., Lazio, T. Joseph, O'Neill, S., Prince, Thomas, Ravi, Vikram, Reeves, Rodrigo, Tassis, Konstantinos, Vallisneri, Michele, Zensus, J.
Haystack and Owens Valley Radio Observatory (OVRO) observations recently revealed strong sinusoidal total flux density variations that maintained coherence between 1975 and 2021 in the blazar PKS 2131-021 ($z=1.283)$. This was interpreted as possible
Externí odkaz:
http://arxiv.org/abs/2407.09647
Autor:
Kouch, Pouya M., Lindfors, Elina, Hovatta, Talvikki, Liodakis, Ioannis, Koljonen, Karri I. I., Nilsson, Kari, Kiehlmann, Sebastian, Max-Moerbeck, Walter, Readhead, Anthony C. S., Reeves, Rodrigo A., Pearson, Timothy J., Jormanainen, Jenni, Ramazani, Vandad Fallah, Graham, Matthew J.
Publikováno v:
A&A 690, A111 (2024)
The origin of high-energy (HE) astrophysical neutrinos has remained an elusive hot topic in the field of HE astrophysics for the past decade. Apart from a handful of individual associations, the vast majority of HE neutrinos arise from unknown source
Externí odkaz:
http://arxiv.org/abs/2407.07153
Autor:
Maharana, Siddharth, Ramaprakash, A. N., Rajarshi, Chaitanya, Khodade, Pravin, Joshi, Bhushan, Chordia, Pravin, Kohok, Abhay, Anche, Ramya M., Modi, Deepa, Kypriotakis, John A., Deokar, Amit, Kinjawadekar, Aditya, Potter, Stephen B., Blinov, Dmitry, Eriksen, Hans Kristian, Falalaki, Myrto, Gajjar, Hitesh, Ghosh, Tuhin, Gjerløw, Eirik, Kiehlmann, Sebastain, Liodakis, Ioannis, Mandarakas, Nikolaos, Panopoulou, Georgia V., Pavlidou, Vasiliki, Pearson, Timothy J., Pelgrims, Vincent, Readhead, Anthony C. S., Skalidis, Raphael, Tassis, Konstantinos, Uppal, Namita, Wehus, Ingunn K.
Publikováno v:
Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130967P (2024)
Wide-Area Linear Optical Polarimeter (WALOP)-South is the first wide-field and survey-capacity polarimeter in the optical wavelengths. On schedule for commissioning in 2024, it will be mounted on the 1 m SAAO telescope in Sutherland Observatory, Sout
Externí odkaz:
http://arxiv.org/abs/2406.19428
Autor:
Lei, Hai, Zhang, Ying-Kang, Jiang, Xiong, Kiehlmann, Sebastian, Readhead, Anthony C. S., Chen, Liang, Liao, Neng-Hui, An, Tao
High-redshift ($z >3$) $\gamma$-ray blazars are rare, but they are crucial for our understanding of jet evolution, $\gamma$-ray production and propagation, and the growth of supermassive black holes in the early universe. A new analysis of Fermi-LAT
Externí odkaz:
http://arxiv.org/abs/2406.03658
Autor:
Sullivan, Andrew G., Blandford, Roger D., Begelman, Mitchell C., Birkinshaw, Mark, Readhead, Anthony C. S.
Double lobe radio sources associated with active galactic nuclei represent one of the longest studied groups in radio astronomy. A particular sub-group of double radio sources comprises the compact symmetric objects (CSOs). CSOs are distinguished by
Externí odkaz:
http://arxiv.org/abs/2401.14399
Autor:
Cheong, Whee Yeon, Lee, Sang-Sung, Kim, Sang-Hyun, Kang, Sincheol, Kim, Jae Young, Rani, Bindu, Readhead, Anthony C. S., Kiehlmann, Sebastian, Lähteenmäki, Anne, Tornikoski, Merja, Tammi, Joni, Ramakrishnan, Venkatessh, Agudo, Iván, Fuentes, Antonio, Traianou, Efthalia, Escudero, Juan, Thum, Clemens, Myserlis, Ioannis, Casadio, Carolina, Gurwell, Mark
We present the multiwavelength flaring activity of the blazar AO 0235+164 during its recent active period from 2013 to 2019. From a discrete correlation function (DCF) analysis, we find a significant (>95%) correlation between radio and $\gamma$-ray
Externí odkaz:
http://arxiv.org/abs/2310.16296
Autor:
Hsu, Po Chih, Koay, Jun Yi, Matsushita, Satoki, Hwang, Chorng-Yuan, Hovatta, Talvikki, Kiehlmann, Sebastian, Readhead, Anthony, Max-Moerbeck, Walter, Reeves, Rodrigo
Studying the long-term radio variability (timescales of months to years) of blazars enables us to gain a better understanding of the physical structure of these objects on sub-parsec scales, and the physics of super massive black holes. In this study
Externí odkaz:
http://arxiv.org/abs/2308.09626
Autor:
Acharyya, Atreya, Adams, Colin, Archer, Avery, Bangale, Priyadarshini, Benbow, Wystan, Brill, Aryeh, Christiansen, Jodi, Chromey, Alisha, Errando, Manel, Falcone, Abe, Feng, Qi, Finley, John, Foote, Gregory, Fortson, Lucy, Furniss, Amy, Gallagher, Greg, Hanlon, William, Hanna, David, Hervet, Olivier, Hinrichs, Claire, Hoang, John, Holder, Jamie, Jin, Weidong, Johnson, Madalyn, Kaaret, Philip, Kertzman, Mary P., Kieda, David, Kleiner, Tobias, Korzoun, Nikolas, Krennrich, Frank, Lang, Mark, Lundy, Matthew, Maier, Gernot, McGrath, Conor, Millard, Matthew, Millis, John, Mooney, Connor, Moriarty, Patrick, Mukherjee, Reshmi, O'Brien, Stephan, Ong, Rene A., Pohl, Martin, Pueschel, Elisa, Quinn, John, Ragan, Kenneth J., Reynolds, Paul, Ribeiro, Deivid, Roache, Emmet Thomas, Sadeh, Iftach, Sadun, Alberto, Saha, Lab, Santander, Marcos, Sembroski, Glenn, Shang, Ruo, Splettstoesser, Megan, Talluri, Anjana, Tucci, James, Vassiliev, Vladimir, Williams, David, Wong, Sam, Hovatta, Talvikki, Jorstad, Svetlana, Kiehlmann, Sebastian, Lahteenmaki, Anne, Liodakis, Ioannis, Marscher, Alan, Max-Moerbeck, Walter, Readhead, Anthony, Reeves, Rodrigo, Smith, Paul S, Tornikoski, Merja
We report the detection of very high energy gamma-ray emission from the blazar S3 1227+25 (VER J1230+253) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS). VERITAS observations of the source were triggered by the detection o
Externí odkaz:
http://arxiv.org/abs/2305.02860
Autor:
Dunne, Delaney A., Cleary, Kieran A., Breysse, Patrick C., Chung, Dongwoo T., Ihle, Havard T., Bond, J. Richard, Eriksen, Hans Kristian, Gundersen, Joshua Ott, Keating, Laura C., Kim, Junhan, Lunde, Jonas Gahr Sturtzel, Murray, Norman, Padmanabhan, Hamsa, Philip, Liju, Stutzer, Nils-Ole, Tolgay, Doga, Wehus, Ingunn Katherine, Church, Sarah E., Gaier, Todd, Harris, Andrew I., Hobbs, Richard, Lamb, James W., Lawrence, Charles R., Readhead, Anthony C. S., Woody, David P.
We present a new upper limit on the cosmic molecular gas density at $z=2.4-3.4$ obtained using the first year of observations from the CO Mapping Array Project (COMAP). COMAP data cubes are stacked on the 3D positions of 243 quasars selected from the
Externí odkaz:
http://arxiv.org/abs/2304.09832
We report the on-wafer characterization of $S$-parameters and microwave noise temperature ($T_{50}$) of discrete metamorphic InGaAs high electron mobility transistors (mHEMTs) at 40 K and 300 K and over a range of drain-source voltages ($V_{DS}$). Fr
Externí odkaz:
http://arxiv.org/abs/2209.02858