Results 41 to 50 of about 765,605 (153)

Very High Energy Solar Energetic Particle Events and Ground Level Enhancement Events: Forecasting and Alerts

Space Weather, Volume 22, Issue 9, September 2024.
Abstract A Ground Level Enhancement (GLE) event can be observed as an increase in the background of ground‐based neutron monitor observations and is often associated with an increase of >500 MeV space‐based proton flux measurements. GLE events begin as very high‐energy SEP events associated with GeV protons. For such events to be detected at sea level,
N. Crosby, H. Mavromichalaki, O. Malandraki, M. Gerontidou, M. Karavolos, D. Lingri, P. Makrantoni, M. Papailiou, P. Paschalis, A. Tezari   +9 more
wiley   +1 more source

VODKA-JWST: Synchronized Growth of Two Supermassive Black Holes in a Massive Gas Disk? A 3.8 kpc Separation Dual Quasar at Cosmic Noon with the NIRSpec Integral Field Unit

The Astrophysical Journal
The search for dual supermassive black holes (SMBHs) is of immense interest in modern astrophysics. Galaxy mergers may fuel and produce SMBH pairs. Actively accreting SMBH pairs are observed as dual quasars, which are vital probes of SMBH growth.
Yuzo Ishikawa, Nadia L. Zakamska, Yue Shen, Xin Liu, Yu-Ching Chen, Hsiang-Chih Hwang, Andrey Vayner, David S. N. Rupke, Sylvain Veilleux, Dominika Wylezalek, Arran C. Gross, Swetha Sankar, Nadiia Diachenko   +12 more
doaj   +1 more source

Host Galaxy Properties of CaII and NaI Quasar Absorption-Line Systems [PDF]

, 2012
Many questions remain within the areas of galaxy formation and evolution. Understanding the origin of gas in galaxy environments, whether as tidal debris, infalling High Velocity Clouds, galaxy outflows, or as gaseous material residing in galaxy disks ...
Cherinka, Brian
core  

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

DIISC-VI (COS-DIISC): Ultraviolet Metal Absorption Relative to the H i Disk of Galaxies

The Astrophysical Journal
As part of the Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium (DIISC) survey, we present the UV metal absorption features in the circumgalactic medium (CGM) near the H i gas disk (
Brad Koplitz, Sanchayeeta Borthakur, Timothy Heckman, Mansi Padave, Tyler McCabe, Jason Tumlinson, Andrew J. Fox, Guinevere Kauffmann   +7 more
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

Determining Quasar Galaxy Morphologies Using GALFIT [PDF]

, 2020
Quasars are an example of a rare active galaxy, those with a supermassive black hole accreting material at the fastest possible rate, except quasars have accretion disks so bright that it outshines the entire host galaxy. Currently, little is known about
Raub, Kaitlyn
core   +1 more source

A Close Quasar Pair in a Massive Galaxy Merger at z = 5.7

The Astrophysical Journal Letters
Close quasar pairs are rare products of galaxy mergers in which both supermassive black holes (SMBHs) are actively accreting, offering strong constraints on merger-driven active galactic nuclei evolution.
Minghao Yue, Xiaohui Fan, Anna-Christina Eilers, Feige Wang, Jinyi Yang, Robert A. Simcoe   +5 more
doaj   +1 more source

Recurrence‐free survival dynamics following adjuvant chemotherapy for resected colorectal cancer: A systematic review of randomized controlled trials

Cancer Medicine, Volume 13, Issue 1, January 2024.
In order to evaluate the temporal recurrence dynamics of colorectal cancer, we conducted a systematic review of Phase III randomized controlled trials centered on Stage II–IV disease, finding that adjuvant cytotoxic chemotherapy improved early—but not remote—recurrence event rates over surgery‐only controls.
Emma Vail, Ankur P. Choubey, H. Richard Alexander, David A. August, Abril Berry, Patrick M. Boland, Mariam F. Eskander, Miral S. Grandhi, Brittany Haliani, Haejin In, Timothy J. Kennedy, Russell C. Langan, Jason C. Maggi, Henry A. Pitt, Shridar Ganesan, Brett L. Ecker   +15 more
wiley   +1 more source

Quasar pairs with arcminute angular separations [PDF]

, 2001
peer reviewedWe use the Véron-Cetty & Véron (\cite {veron}) catalog (VV) of 13 213 quasars to investigate their possible physical grouping over angular scales 10arcsec 3sigma ) excess of pairs of quasars with similar redshifts (Delta ...
Surdej, Jean, V. I. Zhdanov, J. Surdej, Zhdanov, V. I.   +3 more
core   +1 more source