Results 11 to 20 of about 103 (81)

The Lyman‐α Sky Background as Observed by New Horizons

Geophysical Research Letters, Volume 45, Issue 16, Page 8022-8028, 28 August 2018., 2018
Abstract Recent observations of interplanetary medium atomic hydrogen Lyman‐α emission in the outer solar system, made with the Alice ultraviolet spectrograph on New Horizons, are presented. The observations include regularly spaced great circle scans of the sky and pointed observations near the downstream and upstream flow directions of interstellar H
G. Randall Gladstone, W. R. Pryor, S. Alan Stern, Kimberly Ennico, Catherine B. Olkin, John R. Spencer, Harold A. Weaver, Leslie A. Young, Fran Bagenal, Andrew F. Cheng, Nathaniel J. Cunningham, Heather A. Elliott, Thomas K. Greathouse, David P. Hinson, Joshua A. Kammer, Ivan R. Linscott, Joel Wm. Parker, Kurt D. Retherford, Andrew J. Steffl, Darrell F. Strobel, Michael E. Summers, Henry Throop, Maarten H. Versteeg, Michael W. Davis   +23 more
wiley   +1 more source

Heavy Sterile Neutrino in Dark Matter Searches

Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018
Sterile neutrinos are possible dark matter candidates. We examine here possible detection mechanisms, assuming that the neutrino has a mass of about 50 keV and couples to the ordinary neutrino. Even though this neutrino is quite heavy, it is nonrelativistic with a maximum kinetic energy of 0.1 eV.
Paraskevi C. Divari, John D. Vergados, Athanasios Hatzikoutelis   +2 more
wiley   +1 more source

Imaging FTS: A Different Approach to Integral Field Spectroscopy

Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014
Imaging Fourier transform spectroscopy (iFTS) is a promising, although technically very challenging, option for wide‐field hyperspectral imagery. We present in this paper an introduction to the iFTS concept and its advantages and drawbacks, as well as examples of data obtained with a prototype iFTS, SpIOMM, attached to the 1.6 m telescope of the ...
Laurent Drissen, Laurie Rousseau-Nepton, Sébastien Lavoie, Carmelle Robert, Thomas Martin, Pierre Martin, Julie Mandar, Frédéric Grandmont, Polychronis Papaderos   +8 more
wiley   +1 more source

The Mitchell Spectrograph: Studying Nearby Galaxies with the VIRUS Prototype

Advances in Astronomy, Volume 2013, Issue 1, 2013., 2013
The Mitchell Spectrograph (a.k.a. VIRUS‐P) on the 2.7 m Harlan J. Smith telescope at McDonald Observatory is currently the largest field of view (FOV) integral field unit (IFU) spectrograph in the world (1.7′ × 1.7′). It was designed as a prototype for the highly replicable VIRUS spectrograph which consists of a mosaic of IFUs spread over a 16 ...
Guillermo A. Blanc, Jorge Iglesias Páramo   +1 more
wiley   +1 more source

Delayed Massive-star Mechanical Feedback at Low Metallicity

The Astrophysical Journal, 2023
The classical model of massive-star mechanical feedback is based on effects at solar metallicity ( Z _⊙ ), yet feedback parameters are very different at low metallicity.
Michelle C. Jecmen, M. S. Oey
doaj   +1 more source

Statistical and Dynamical Decoupling of the IGM from Dark Matter

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
Although the gravitational field in the universe is dominated by dark matter, cosmological observations show that the statistical properties of cosmic baryonic matter are significantly and systematically decoupled from that of the underlying dark matter. The dynamical reason of the decoupling is the difference of the nonlinear evolution of baryon fluid
Li-Zhi Fang, Weishan Zhu, Martin Hardcastle   +2 more
wiley   +1 more source

Primordial Non‐Gaussianity in the Large‐Scale Structure of the Universe

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
Primordial non‐Gaussianity is a potentially powerful discriminant of the physical mechanisms that generated the cosmological fluctuations observed today. Any detection of significant non‐Gaussianity would thus have profound implications for our understanding of cosmic structure formation. The large‐scale mass distribution in the Universe is a sensitive
Vincent Desjacques, Uroš Seljak, Dragan Huterer   +2 more
wiley   +1 more source

Lyα visibility from z = 4.5 to 11 in the UDS field: Evidence for a high neutral hydrogen fraction and small ionized bubbles at z ∼ 7

Astronomy & Astrophysics
The resonant scattering nature of Lyα photons interacting with neutral hydrogen makes Lyα emitters (LAEs) robust tracers of the intergalactic neutral hydrogen fraction, and thus sensitive probes of cosmic reionization.
Napolitano L., Pentericci L., Dickinson M., Arrabal Haro P., Taylor A. J., Calabrò A., Bhagwat A., Santini P., Arevalo-Gonzalez F., Begley R., Castellano M., Ciardi B., Donnan C. T., Dottorini D., Dunlop J. S., Finkelstein S. L., Fontana A., Giavalisco M., Hirschmann M., Jung I., Koekemoer A. M., Kokorev V., Llerena M., Lucas R. A., Mascia S., Merlin E., Pérez-González P. G., Stanton T. M., Tripodi R., Wang X., Weiner B. J.   +30 more
doaj   +1 more source

MUSE Analysis of Gas around Galaxies (MAGG)

Astronomy & Astrophysics
We investigate the connection between strong, blended Lyα absorption systems (SBLAs) and ≈1000 Lyα-emitting galaxies (LAEs) at z ≳ 3 in 28 quasar fields from the MUSE Analysis of Gas around Galaxies (MAGG) survey. Selecting SBLAs as spectral regions with
Galbiati Marta, Tornotti Davide, Fumagalli Michele, Fossati Matteo, Pieri Matthew   +4 more
doaj   +1 more source

GA-NIFS: AGN activity in a Lyα emitter within a triple-AGN system anchored by a passive galaxy at z = 3

Astronomy & Astrophysics
Context. Massive quenched galaxies at z > 3 challenge models of early galaxy evolution, as their rapid formation and abrupt quenching require efficient feedback, which is often linked to active galactic nuclei (AGNs).
Perna Michele, Arribas Santiago, Hamed Mahmoud, D’Eugenio Francesco, Lamperti Isabella, Bunker Andrew J., Carniani Stefano, Charlot Stéphane, Maiolino Roberto, Rodríguez Del Pino Bruno, Übler Hannah, Böker Torsten, Bertola Elena, Cresci Giovanni, Venturi Giacomo, Ginolfi Michele, Villar Martín Montserrat, Zamora Sandra   +17 more
doaj   +1 more source