Results 71 to 80 of about 28,808 (222)

Circumgalactic Environments Around Distant Quasars 3C 9 and 4C 05.84

The Astrophysical Journal
We present results from the Quasar hosts Unveiled by high Angular Resolution Techniques survey studying the circumgalactic medium (CGM) by observing rest-frame UV emission lines Ly α , C iv , and He ii around two radio-loud quasars, 3C 9 ( z = 2.02) and ...
Sanchit Sabhlok, Shelley A. Wright, Andrey Vayner, Sonata Simonaitis-Boyd, Norman Murray, Lee Armus, Maren Cosens, James Wiley, Mariska Kriek   +8 more
doaj   +1 more source

Deuterium Balmer Emission from Nebulae [PDF]

Symposium - International Astronomical Union, 2000
We report on the detection and first identification of the deuterium Balmer lines dα and dβ, observed in emission in the Orion Nebula (M 42). The excitation mechanism is UV fluorescence from the Lyman(D i) lines at the interface between the H ii region and the molecular cloud. These lines may open the possibility to measure D/H in galactic H ii regions
Guillaume Hébrard, Daniel Péquignot, Alfred Vidal-Madjar, Jeremy R. Walsh, Roger Ferlet   +4 more
openaire   +1 more source

Emission-Line Fluxes of Northern Planetary Nebulae [PDF]

Publications of the Astronomical Society of Australia, 2015
AbstractWe present long slit spectrophotometric emission line fluxes of bright and extended (< 5 arcsec in diameter) planetary nebulae (PNe), selected from a catalogue with suitable equatorial coordinates for northern hemisphere. In total, 17 planetary nebulae have been chosen and observed in 2008–2010.
Aksaker, N., Yerli, S. K., Kiziloglu, U., Atalay, B.   +3 more
openaire   +4 more sources

The neuromodulatory fragility hypothesis of Alzheimer's disease pathogenesis

Alzheimer's &Dementia, Volume 22, Issue 3, March 2026.
Abstract Sporadic Alzheimer's disease (AD) is associated with numerous risk factors, yet its precise cause remains unclear. Here, we describe a novel framework for AD pathogenesis, whereby diverse risk factors converge on neuromodulatory subcortical systems to confer AD risk or resilience.
Alfie Wearn, Kate M. Onuska, Taylor W. Schmitz, Gary R. Turner, R. Nathan Spreng   +4 more
wiley   +1 more source

The JWST-NIRCam View of Sagittarius C. II. Evidence for Magnetically Dominated H ii Regions in the Central Molecular Zone

The Astrophysical Journal
We present JWST-NIRCam narrowband, 4.05 μ m Br α images of the Sgr C H ii region, located in the central molecular zone (CMZ) of the Galaxy. Unlike any H ii region in the solar vicinity, the Sgr C plasma is dominated by filamentary structure in both Br α
John Bally, Samuel Crowe, Rubén Fedriani, Adam Ginsburg, Rainer Schödel, Morten Andersen, Jonathan C. Tan, Zhi-Yun Li, Francisco Nogueras-Lara, Yu Cheng, Chi-Yan Law, Q. Daniel Wang, Yichen Zhang, Suinan Zhang   +13 more
doaj   +1 more source

The SUPERCOLD-CGM Survey. I. Probing the Extended CO(4–3) Emission of the Circumgalactic Medium in a Sample of 10 Enormous Lyα Nebulae at z ∼ 2

The Astrophysical Journal, 2023
To understand how massive galaxies at high z coevolve with enormous reservoirs of halo gas, it is essential to study the coldest phase of the circumgalactic medium (CGM), which directly relates to stellar growth.
Jianrui Li, Bjorn H. C. Emonts, Zheng Cai, Jianan Li, Fabrizio Arrigoni Battaia, Jason X Prochaska, Ilsang Yoon, Matthew D. Lehnert, Craig Sarazin, Yunjing Wu, Mark Lacy, Brian Mason, Kyle Massingill   +12 more
doaj   +1 more source

A Green Bank Telescope Survey of Large Galactic HII Regions [PDF]

, 2017
As part of our ongoing HII Region Discovery Survey (HRDS), we report the Green Bank Telescope detection of 148 new angularly-large Galactic HII regions in radio recombination line (RRL) emission.
Anderson, L. D., Armentrout, W. P., Balser, Dana S., Bania, T. M., Luisi, Matteo, Wenger, Trey V.   +5 more
core   +1 more source

X-Ray Emission from the Guitar Nebula [PDF]

The Astrophysical Journal, 1997
We have detected weak soft X-ray emission from the Pulsar Wind Nebula trailing the high velocity star PSR 2224+65 (the `Guitar Nebula'). This X-ray flux gives evidence of ~10^7 eV particles in the pulsar wind and constrains the properties of the post-shock flow.
Romani, Roger W., Cordes, James M., Yadigaroglu, I. -A.   +2 more
openaire   +2 more sources

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

MAMMOTH-Subaru. II. Diverse Populations of Circumgalactic Lyα Nebulae at Cosmic Noon

The Astrophysical Journal Supplement Series
Circumgalactic Ly α nebulae are gaseous halos around galaxies exhibiting luminous extended Ly α emission. This work investigates Ly α nebulae from deep imaging of ∼12 deg ^2 sky, targeted by the MAMMOTH-Subaru survey.
Mingyu Li, Haibin Zhang, Zheng Cai, Yongming Liang, Nobunari Kashikawa, Ke Ma, Xiaohui Fan, J. Xavier Prochaska, Bjorn H. C. Emonts, Xin Wang, Yunjing Wu, Shiwu Zhang, Qiong Li, Sean D. Johnson, Minghao Yue, Fabrizio Arrigoni Battaia, Sebastiano Cantalupo, Joseph F. Hennawi, Satoshi Kikuta, Yuanhang Ning, Masami Ouchi, Rhythm Shimakawa, Ben Wang, Weichen Wang, Zheng Zheng, Zhen-Ya Zheng   +25 more
doaj   +1 more source