Results 61 to 70 of about 207,256 (183)

Gamma ray emission from embedded young massive star clusters unveiled by Fermi-LAT [PDF]

EPJ Web of Conferences
Massive star clusters (SCs) have been proposed as additional contributors to Galactic Cosmic rays (CRs), to overcome the limitations of supernova remnants (SNR) to reach the highest energy end of the Galactic CR spectrum.
Peron Giada, Morlino Giovanni, Amato Elena, Menchiari Stefano   +3 more
doaj   +1 more source

Galactic Superaccreting X-Ray Binaries as Super-PeVatron Accelerators

The Astrophysical Journal Letters
The extension of the cosmic-ray (CR) spectrum well beyond 1 PeV necessitates the existence of a population of accelerators in the Milky Way, which we refer to as super-PeVatrons. Identifying the nature of these sources remains a challenge to the paradigm
Jieshuang Wang, Brian Reville, Felix A. Aharonian   +2 more
doaj   +1 more source

The Spatially Resolved Hot Gas Properties of NGC 1266’s Active Galactic Nucleus-driven Outflow

The Astrophysical Journal
Galactic winds play a critical role in galaxy evolution, yet their structure and driving mechanisms remain poorly understood, especially in low-luminosity active galactic nucleus (LLAGN) systems.
Sebastian Lopez, Laura A. Lopez, Lauranne Lanz, Justin A. Otter, Katherine Alatalo   +4 more
doaj   +1 more source

Under Pressure: Ultraviolet Emission-line Ratios as Barometers of Active Galactic Nuclei Feedback Mechanisms

The Astrophysical Journal
Feedback from active galactic nuclei (AGN) is widely acknowledged to regulate the growth of massive galaxies, though its driving mechanisms are debated.
Elise Fuller, Sean D. Johnson, Jonathan Stern, Hsiao-Wen Chen, Ena Choi, Claude-André Faucher-Giguère, Massimo Gaspari, Andy Goulding, Jenny Greene, Timothy M. Heckman, Jennifer I-Hsiu Li, Zhuoqi Liu, Nishant Mishra, Kristina Nyland, Kate Rowlands, Gwen C. Rudie, Evan Schneider, Dominika Wylezalek, Nadia L. Zakamska   +18 more
doaj   +1 more source

Wind-fed Supermassive Black Hole Accretion in the Ultracompact Dwarf Galaxy M60-UCD1

The Astrophysical Journal
Ultracompact dwarf galaxies (UCDs) are thought to be remnants of stripped galactic nuclei, among which a handful are known to host a central supermassive black hole (SMBH).
Zhao Su, Zhiyuan Li, Meicun Hou
doaj   +1 more source

Spatially Resolved Circumgalactic Medium around a Star-forming Galaxy Driving a Galactic Outflow at z ≈ 0.8

The Astrophysical Journal
We report the small-scale spatial variation in cool ( T  ∼ 10 ^4 K) Mg ii absorption detected in the circumgalactic medium (CGM) of a star-forming galaxy at z  ≈ 0.8.
Ahmed Shaban, Rongmon Bordoloi, John M. O’Meara, Keren Sharon, Nicolas Tejos, Sebastian Lopez, Cédric Ledoux, L. Felipe Barrientos, Jane R. Rigby   +8 more
doaj   +1 more source

A Dual Active Black Hole Candidate with Mass Ratio ~7:1 in a Disk Galaxy

The Astrophysical Journal Letters
Dual active galactic nuclei (AGNs) with comparable masses are commonly witnessed among the major merged galaxies with interaction remnants. Considering almost every massive galaxy is associated with multiple dwarf satellites around it, minor mergers ...
Xiao Cao, Yan-Mei Chen, Yong Shi, Junfeng Wang, Zhijie Zhou, Min Bao, Qiusheng Gu, Alexei Moiseev, Luis C. Ho, Lan Wang, Guangquan Zeng   +10 more
doaj   +1 more source

CLASSY. X. Highlighting Differences between Partial Covering and Semianalytic Modeling in the Estimation of Galactic Outflow Properties

The Astrophysical Journal
Feedback-driven massive outflows play a crucial role in galaxy evolution by regulating star formation and influencing the dynamics of surrounding media. Extracting outflow properties from spectral lines is a notoriously difficult process for a number of ...
Mason Huberty, Cody Carr, Claudia Scarlata, Timothy Heckman, Alaina Henry, Xinfeng Xu, Karla Z. Arellano-Córdova, Danielle A. Berg, Stéphane Charlot, John Chisholm, Simon Gazagnes, Matthew Hayes, Weida Hu, Bethan L. James, R. Michael Jennings, Claus Leitherer, Crystal L. Martin, Matilde Mingozzi, Evan D. Skillman, Yuma Sugahara   +19 more
doaj   +1 more source

Elemental abundances in AGB stars and the formation of the Galactic bulge

EPJ Web of Conferences, 2012
We obtained high-resolution near-IR spectra of 45 AGB stars located in the Galactic bulge. The aim of the project is to determine key elemental abundances in these stars to help constrain the formation history of the bulge.
Wood P.R., Ryde N., Lebzelter T., Blommaert J.A.D.L., Uttenthaler S., Schultheis M., Aringer B.   +6 more
doaj   +1 more source

A Galactic Wind at z = 5.190

, 2002
12 pages, 7 figures, accepted for publication in the Astrophysical ...
Dawson, Steve, Spinrad, Hyron, Dey, Arjun, van Breugel, Wil, de Vries, Wim, Stern, Daniel, Reuland, Michiel   +6 more
openaire   +2 more sources