Results 21 to 30 of about 49,283 (254)

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

HIROCS – a galaxy cluster survey at high redshifts [PDF]

Proceedings of the International Astronomical Union, 2004
As a step towards our understanding of galaxy evolution and for testing predictions of cosmological models we started a survey for galaxy clusters intending to identify candidates out to redshifts of ~1.5: HIROCS (= Heidelberg InfraRed/Optical Cluster Survey) is a multi-color survey (B, R, i, z and H) covering 11 square degrees in four fields on the ...
Falter, S., Roeser, H. -J., Hippelein, H., Bell, E., Wolf, C.   +4 more
openaire   +2 more sources

Unraveling the enigmatic soft x‐ray excess: Current understanding and future perspectives

Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023
Abstract This article explores various theoretical models proposed to explain the soft x‐ray excess phenomenon, including warm Comptonization, ionized reflection models, and ionized outflowing disc winds. The soft x‐ray excess is better understood thanks to crucial observations made by ROSAT, XMM‐Newton, and eROSITA.
Thomas Boller
wiley   +1 more source

Cosmological Parameters from Planck Data in SU(2)CMB, Their Local ΛCDM Values, and the Modified Photon Boltzmann Equation

Annalen der Physik, Volume 535, Issue 7, July 2023., 2023
Implications for the cosmological model are explored of the assumption that the cosmic microwave background is subject to an SU(2) Yang– Mills theory of scale 10−4 eV rather than U(1) quantum thermodynamics. This concerns zeroth‐order (changes at high redshifts) and first‐order cosmological perturbations (changes at high and low redshifts).
Ralf Hofmann, Janning Meinert, Shyam Sunder Balaji   +2 more
wiley   +1 more source

Distant Galaxy Clusters Identified From Optical Background Fluctuations [PDF]

, 1996
We present the first high redshift (0.3 < z < 1.1) galaxy clusters found by systematically identifying optical low surface brightness fluctuations in the background sky.
Dalcanton, Julianne J., Gonzalez, Anthony H., Nelson, Amy E., Zaritsky, Dennis   +3 more
core   +3 more sources

Spatial clustering of high-redshift Lyman-break galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
We present a physically motivated semi-analytic model to understand the clustering of high redshift LBGs. We show that the model parameters constrained by the observed luminosity function, can be used to predict large scale ( > 80 arcsec) bias and angular correlation function of galaxies.
Jose, Charles, Subramanian, Kandaswamy, Srianand, Raghunathan, Samui, Saumyadip   +3 more
openaire   +2 more sources

Characteristic Features of Gravitational Wave Lensing as Probe of Lens Mass Model

Annalen der Physik, Volume 535, Issue 6, June 2023., 2023
The gravitational lensing of gravitational waves is an expanding field in astronomy and cosmology. It might contribute to solving many different issue in these fields. To exploit its potential, first of all, one needs to recognize and model a gravitational wave event properly.
Paolo Cremonese, David Fonseca Mota, Vincenzo Salzano   +2 more
wiley   +1 more source

The Three Hundred–NIKA2 Sunyaev–Zeldovich Large Program twin samples: Synthetic clusters to support real observations [PDF]

EPJ Web of Conferences, 2022
The simulation database of The Three Hundred Project has been used to pick synthetic clusters of galaxies with properties close to the observational targets of the NIKA2 camera Sunyaev–Zeldovich (SZ) Large Program.
Paliwal A., Artis E., Cui W., De Petris M., Désert F.-X., Ferragamo A., Gianfagna G., Kéruzoré F., Macías-Pérez J.-F., Mayet F., Muñoz-Echeverría M., Perotto L., Rasia E., Ruppin F., Yepes G.   +14 more
doaj   +1 more source

Understanding the non-linear clustering of high-redshift galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
We incorporate the non-linear clustering of dark matter halos, as modelled by Jose et al. (2016) into the halo model to better understand the clustering of Lyman break galaxies (LBGs) in the redshift range $z=3-5$. We find that, with this change, the predicted LBG clustering increases significantly on quasi-linear scales ($0.1 \leq r\,/\,h^{-1} \,{\rm ...
Jose, C., Baugh, C. M., Lacey, C. G., Subramanian, K.   +3 more
openaire   +3 more sources

Revisiting the emission line source detection problem in integral field spectroscopic data

Astronomische Nachrichten, Volume 344, Issue 5, June 2023., 2023
Abstract We present a 3‐dimensional matched filtering approach for the blind search of faint emission‐line sources in integral‐field spectroscopic datasets. The filter is designed to account for the spectrally rapidly varying background noise due to the telluric air glow spectrum.
Edmund Christian Herenz
wiley   +1 more source