Results 71 to 80 of about 108,440 (263)

Stacking PANCAKEZ: Spectroscopic Analysis with NIRSpec Stacks in the Epoch of Reionization. Weak Interstellar Medium Absorption and Implications for Ionizing Photon Escape at z ∼ 7

The Astrophysical Journal
We present a spectral stacking analysis of galaxies at z ≥ 6 observed with the James Webb Space Telescope (JWST). We curate a sample of 64 galaxies spanning redshifts z _spec = 6.0–9.4, which have NIRSpec medium-resolution data.
Kelsey S. Glazer, Tucker Jones, Yuguang Chen, Ryan L. Sanders, Maruša Bradač, Anthony J. Pahl, Alice E. Shapley, Richard S. Ellis, Michael W. Topping, Naveen A. Reddy   +9 more
doaj   +1 more source

Lactea: Web‐Based Spectrum‐Preserving Multi‐Resolution Visualization of the GAIA Star Catalog

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract The explosion of data in astronomy has resulted in an era of unprecedented opportunities for discovery. The GAIA mission's catalog, containing a large number of light sources (mostly stars) with several parameters such as sky position and proper motion, is playing a significant role in advancing astronomy research and has been crucial in ...
Reem Alghamdi, Markus Hadwiger, Guido Reina, Alberto Jaspe‐Villanueva   +3 more
wiley   +1 more source

Dark Energy From the Gravitational Wave Background With Scalar Field Dark Matter

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT Recent observational results, such as those from pulsar timing arrays (PTA), suggest a low‐frequency Gravitational Wave Background (GWB) permeates our universe. This opens the possibility that gravitational waves could span a broader spectrum, potentially impacting cosmological scales.
Edwin L. Pérez‐Ochoa, Tonatiuh Matos
wiley   +1 more source

swPHoToNs: Toward trillion‐body‐scale cosmological N‐body simulations on Sunway TaihuLight supercomputer

Engineering Reports, Volume 7, Issue 3, March 2025.
We present the details of implementing a highly efficient and scalable Cosmological N‐body simulation framework on the heterogeneous many‐core supercomputer Sunway TaihuLight. We manage to conduct cosmological simulations which contain up to 1.6 trillion particles, obtaining a sustained performance of 56.3 PFlops with a weak‐scaling parallel efficiency
Zhao Liu, Qiao Wang, Xiaojing Lv, Xu Liu, Hongsong Meng, Guanghui Zhu, Liang Gao, Haohuan Fu, Guangwen Yang   +8 more
wiley   +1 more source

Low-redshift Analogs of Cosmic Noon Galaxies as Laboratories for Clumpy Star Formation

The Astrophysical Journal
It has been established that a significant fraction of star formation at high redshift occurs in clumpy galaxies. The properties of clumps and their formation mechanisms, however, remain highly debated. In this work we analyze a sample of 18 supercompact
Jorge M. Santos-Junior, Thiago S. Gonçalves, Luidhy Santana-Silva, Arianna Cortesi, Karin Menendez-Delmestre, Amanda E. Araujo-Carvalho   +5 more
doaj   +1 more source

Study of star-forming galaxies in SDSS up to redshift 0.4: I. Metallicity evolution

, 2009
The chemical composition of the gas in galaxies versus cosmic time provides a very important tool for understanding galaxy evolution. Although there are many studies at high redshift, they are rather scarce at lower redshifts.
Bongiovanni, A., Castaneda, H., Cepa, J., Garcia, A. M. Perez, Lara-Lopez, M. A., Lorenzo, M. Fernandez, Povic, M., Sanchez-Portal, M.   +7 more
core   +2 more sources

Searching the Non‐Accreting White Dwarf Population in eROSITA Data

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT eROSITA is the soft X‐ray instrument aboard the Spectrum Roentgen Gamma (SRG) satellite that is most sensitive in the energy range between 0.2 and 2.3 keV. Between December 2019 and December 2021, eROSITA completed four all‐sky surveys, producing all‐sky X‐ray source lists and sky maps of unprecedented depth.
S. Friedrich, C. Maitra, K. Dennerl, A. Schwope, K. Werner, B. Stelzer   +5 more
wiley   +1 more source

Early Results from GLASS-JWST. XXV. Electron Density in the Interstellar Medium at 0.7 ≲ z ≲ 9.3 with NIRSpec High-resolution Spectroscopy

The Astrophysical Journal Letters
The electron density ( n _e ) of the interstellar medium (ISM) in star-forming galaxies is intimately linked to star formation and ionization condition.
Sijia Li, Xin Wang, Yuguang Chen, Tucker Jones, Tommaso Treu, Karl Glazebrook, Xianlong He, Alaina Henry, Xiao-Lei Meng, Takahiro Morishita, Guido Roberts-Borsani, Lilan Yang, Hao-Ran Yu, Antonello Calabrò, Marco Castellano, Nicha Leethochawalit, Benjamin Metha, Themiya Nanayakkara, Namrata Roy, Benedetta Vulcani   +19 more
doaj   +1 more source

The ionisation parameter of star-forming galaxies evolves with the specific star formation rate

, 2018
We investigate the evolution of the ionisation parameter of star-forming galaxies using a high-redshift ($z\sim 1.5$) sample from the FMOS-COSMOS survey and matched low-redshift samples from the Sloan Digital Sky Survey.
Bian, Fuyan, Groves, Brent, Kaasinen, Melanie, Kartaltepe, Jeyhan, Kashino, Daichi, Kewley, Lisa, Silverman, John   +6 more
core   +1 more source

Deep GMRT 150 MHz observations of the LBDS-Lynx region: Ultra-Steep Spectrum Radio Sources [PDF]

, 2010
It has been known for nearly three decades that high redshift radio galaxies exhibit steep radio spectra, and hence ultra-steep spectrum radio sources provide candidates for high-redshift radio galaxies.
Abazajian, Athreya, Becker, Bennett, Best, Blumenthal, Blundell, Bornancini, Brookes, Bryant, C. H. Ishwara-Chandra, Caccianiga, Carilli, Chambers, Collister, Condon, Cruz, Cruz, Csabai, De Breuck, De Breuck, De Breuck, De Breuck, De Breuck, Donnelly, Dwarakanath, Fanaroff, Gopal-Krishna, Gruppioni, Hales, Ivezic, Jarvis, Jarvis, Klamer, Kopylov, Kronberg, Lacy, Lacy, Lilly, Mangalam, Mauch, McCarthy, McCarthy, McGilchrist, Miley, Oort, Oort, Oort, Pedani, Pentericci, Perley, Pérez-Torres, R. Windhorst, Rawlings, Rawlings, Rengelink, Rottgering, Rottgering, S. K. Sirothia, S. Pal, Schoenmakers, Sirothia, Stern, Swarup, Tielens, Van Breugel, Villani, Waddington, Windhorst, Windhorst, Y. Wadadekar   +70 more
core   +1 more source