Results 21 to 30 of about 100,039 (213)

The Far-Ultraviolet Continuum Slope as a Lyman Continuum Escape Estimator at High-redshift [PDF]

Monthly notices of the Royal Astronomical Society, 2022
Most of the hydrogen in the intergalactic medium (IGM) was rapidly ionized at high-redshifts. While observations have established that reionization occurred, observational constraints on the high-redshift ionizing emissivity remain elusive.
J. Chisholm, A. Saldana-Lopez, S. Flury, D. Schaerer, A. Jaskot, R. Amorín, H. Atek, S. Finkelstein, B. Fleming, H. Ferguson, V. Fernández, M. Giavalisco, M. Hayes, T. Heckman, A. Henry, Z. Ji, R. Marques-Chaves, V. Mauerhofer, S. McCandliss, M. Oey, G. Östlin, M. Rutkowski, C. Scarlata, T. Thuan, M. Trebitsch, B. Wang, G. Worseck, X. Xu   +27 more
semanticscholar   +1 more source

Nearly all the sky is covered by Lyman-α emission around high-redshift galaxies [PDF]

Nature, 2018
Galaxies are surrounded by large reservoirs of gas, mostly hydrogen, that are fed by inflows from the intergalactic medium and by outflows from galactic winds.
L. Wisotzki, R. Bacon, J. Brinchmann, J. Brinchmann, S. Cantalupo, P. Richter, J. Schaye, K. Schmidt, T. Urrutia, P. Weilbacher, M. Akhlaghi, N. Bouché, T. Contini, B. Guiderdoni, E. C. Herenz, H. Inami, J. Kerutt, F. Leclercq, R. Marino, M. Maseda, A. Monreal-Ibero, A. Monreal-Ibero, T. Nanayakkara, J. Richard, R. Saust, M. Steinmetz, M. Wendt   +26 more
semanticscholar   +1 more source

The [CII] 158 micron line emission in high-redshift galaxies [PDF]

, 2017
The [CII] fine structure transition at 158 microns is the dominant cooling line of cool interstellar gas, and is the brightest of emission lines from star forming galaxies from FIR through meter wavelengths.
G. Lagache, M. Cousin, M. Chatzikos
semanticscholar   +1 more source

Decomposition of the central structure of NGC 2273 in the NIR: A case study

Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023
Abstract The Seyfert 2 galaxy NGC 2273 is a prime target to explore how active nuclei can be fed. It has a star‐forming innermost nuclear ring with a radius of 0.33kpc from where material may be funneled to the supermassive black hole in its center. In this article, we discuss high‐resolution adaptive optics aided JHKs images of NGC 2273 taken with the
L. Schey, J. Heidt, A. Pramskiy, D. Thompson, G. Agapito, S. Esposito, R. Gredel, D. Miller, E. Pinna, A. Puglisi, F. Rossi, W. Seifert, G. Taylor, A. Quirrenbach   +13 more
wiley   +1 more source

PAWS and POCO: NIR Astrophotonic Instruments for Astronomy

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract For near‐infrared ground and space‐based astronomy, compact photonic devices can replace the large bulk optical components in spectrographs, frequency combs, beam combiners, and sky subtraction filters, thus saving cost, reducing volume, weight, and power requirements.
Kalaga Madhav, Alan Günther, Eloy Hernandez, Stella Vjes̆nica, Daniel Bodenmüller, Andreas Stoll, Christer Sandin, Haydar Altuğ Yıldırım, Martin M. Roth   +8 more
wiley   +1 more source

Relativistic jet feedback in high-redshift galaxies – I. Dynamics [PDF]

, 2016
We present the results of three dimensional relativistic hydrodynamic simulations of interaction of AGN jets with a dense turbulent two-phase interstellar medium, which would be typical of high redshift galaxies.
D. Mukherjee, G. Bicknell, R. Sutherland, A. Wagner   +3 more
semanticscholar   +1 more source

Evaluating the GeoSnap 13‐μ$$ \mu $$m cutoff HgCdTe detector for mid‐IR ground‐based astronomy

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract New mid‐infrared HgCdTe (MCT) detector arrays developed in collaboration with Teledyne Imaging Sensors (TIS) have paved the way for improved 10‐μ$$ \mu $$m sensors for space‐ and ground‐based observatories. Building on the successful development of longwave HAWAII‐2RGs for space missions such as NEO Surveyor, we characterize the first 13‐μ ...
Jarron M. Leisenring, Dani Atkinson, Rory Bowens, Vincent Douence, William F. Hoffmann, Michael R. Meyer, John Auyeung, James Beletic, Mario S. Cabrera, Alexandra Z. Greenbaum, Philip Hinz, Derek Ives, William J. Forrest, Craig W. McMurtry, Judith L. Pipher, Eric Viges   +15 more
wiley   +1 more source

HIGH-REDSHIFT GALAXIES IN THE HUBBLE DEEP FIELD : COLOUR SELECTION AND STAR FORMATION HISTORY TO Z 4 [PDF]

, 1996
The Lyman decrement associated with the cumulative effect of H I in QSO absorption systems along the line of sight provides a distinctive feature for identifying galaxies at z ≳ 2.5.
P. Madau, H. Ferguson, M. Dickinson, M. Giavalisco, C. Steidel, A. Fruchter   +5 more
semanticscholar   +1 more source

Detector system challenges of the wide‐field spectroscopic survey telescope (WST)

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
Abstract The wide‐field spectroscopic survey telescope (WST) is proposed to become the next large optical/near infrared facility for the European southern observatory (ESO) once the extremely large telescope (ELT) has become operational. While the latter is optimized for unprecedented sensitivity and adaptive‐optics assisted image quality over a small ...
Roland Bacon, Martin M. Roth, Paola Amico, Eloy Hernandez, The WST Consortium   +4 more
wiley   +1 more source

High redshift radio galaxies and divergence from the CMB dipole [PDF]

, 2017
Previous studies have found our velocity in the rest frame of radio galaxies at high redshift to be much larger than that inferred from the dipole anisotropy of the cosmic microwave background.
J. Colin, R. Mohayaee, M. Rameez, S. Sarkar, S. Sarkar   +4 more
semanticscholar   +1 more source