Results 51 to 60 of about 1,488 (191)

Analysis of the two degree field galaxy redshift survey [PDF]

, 2001
In this Thesis we analyse in detail the Anglo-Australian 2 degree Field Galaxy Redshift Survey (2dFGRS). The goal of this survey is to measure all galaxy redshifts for the 250 000 galaxies brighter than b(_J) = 19.45 spread over ~ 2000 square degrees. At
Norberg, Iohn Peder Ragnar
core  

Preimpact Detection of Chelyabinsk‐Type Objects in the Thermal Infrared: Possibilities and Limitations

Advances in Astronomy, Volume 2025, Issue 1, 2025.
The Chelyabinsk meteor entered Earth’s atmosphere on 15 February 2013, producing a shock wave that injured about 1500 people and damaged thousands of buildings. Despite its relatively large size (∼20 m), the progenitor asteroid approached Earth undetected. Its apparent radiant was too close to the Sun for standard ground‐based near‐Earth asteroid (NEA)
Thomas Müller, Luca Conversi, Javier Licandro, Marco Delbo, Alan Fitzsimmons, Karri Muinonen, Marcel Popescu, Paolo Tanga, Richard Moissl, Michael Kueppers   +9 more
wiley   +1 more source

The influence of extragalactic magnetic fields on the propagation of cosmic rays from Centaurus A

, 2011
The motion of different chemical composition of ultra high energy cosmic rays in the galactic magnetic fields with taking into account the extragalactic magnetic field was considered.
Marchenko, V., Sushchov, O., Bogdan, T., Kobzar, O., Hnatyk, B.   +4 more
core   +2 more sources

Gaia Data Release 3 : The extragalactic content

, 2023
The Gaia Galactic survey mission is designed and optimized to obtain astrometry, photometry, and spectroscopy of nearly two billion stars in our Galaxy.
Heiter, Ulrike, Gavel, Alvin, Korn, Andreas, Bailer-Jones, C. A. L., Zwitter, T.,, Heiter, Ulrike,, Gavel, Alvin,, Zwitter, T., Bailer-Jones, C. A. L.,, Korn, Andreas,   +9 more
core   +2 more sources

A Glimpse of Satellite Galaxies in the Milky Way with the 2.5 m Wide Field Survey Telescope (WFST): Boötes III and Draco

The Astrophysical Journal
We carry out deep imaging of the Milky Way satellite galaxies, Boötes III and Draco, with the Wide Field Survey Telescope (WFST) as one pilot observing program to demonstrate the capability of WFST. Combining catalogs with PS1 DR2 and Gaia DR3, we derive
Chao Yang, Zhizheng Pan, Min Fang, Xian Zhong Zheng, Binyang Liu, Guoliang Li, Tian-Rui Sun, Ji-An Jiang, Miaomiao Zhang, Zhen Wan, Shuang Liu, Han Qu, Ji Yang, Xu Kong, Wenhao Liu, Yiping Shu, Jiang Chang, Tinggui Wang, Lulu Fan, Yongquan Xue, Wentao Luo, Hongxin Zhang, Zheng Lou, Haibin Zhao, Bin Li, Hairen Wang, Dazhi Yao, Jian Wang, Hongfei Zhang, Feng Li, Hao Liu, Ming Liang, Jinlong Tang, Yuheng Zhang, Man Qiao, Run Wen, Zongfei Lyu   +36 more
doaj   +1 more source

Aliasing from Galactic Plane Setting in Widefield Radio Interferometry

The Astrophysical Journal
Measurements with widefield radio interferometers often include the near-infinite gradient between the sky and the horizon. This causes aliasing inherent to the measurement itself and is purely a consequence of the Fourier basis.
N. Barry, J. L. B. Line, C. R. Lynch, M. Kriele, J. Cook   +4 more
doaj   +1 more source

Antimatter Gravity and the Results of the ALPHA‐g Experiment

Annalen der Physik, Volume 536, Issue 7, July 2024.
The recent results of the ALPHA‐g experiment, which show gravitational attraction between antihydrogen atoms and the Earth, seem to undermine the success of repulsive‐gravity models in the cosmological field. Analyzing the theory of CPT gravity, two solutions are found that are consistent with the experimental results, while preserving the large‐scale ...
Massimo Villata
wiley   +1 more source

Mapping the Filamentary Nebula of NGC 1275 with Multiwavelength SITELLE Observations

The Astronomical Journal
The filamentary nebula encompassing the central galaxy of the Perseus Cluster, NGC 1275, is a complex structure extending dozens of kiloparsecs from NGC 1275.
Carter Lee Rhea, Julie Hlavacek-Larrondo, Marie-Lou Gendron-Marsolais, Benjamin Vigneron, Megan Donahue, Auriane Thilloy, Laurie Rousseau-Nepton, Mar Mezcua, Norbert Werner, Jorge Barrera-Ballesteros, Hyunseop Choi, Alastair Edge, Andrew Fabian, G. Mark Voit   +13 more
doaj   +1 more source

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

Galaxy and Mass Assembly (GAMA). The Properties of Quasar Host Galaxies: Star Formation Histories and Stellar Populations

The Astrophysical Journal
We investigated the star formation history and stellar populations of a sample of 205 Type I quasar host galaxies (0.1 < z < 0.35) and compared them with normal (nonactive) galaxies of the same mass and redshift within the volume of the Galaxy and Mass ...
Maria B. Stone, Roberto De Propris, Clare Wethers, Jari Kotilainen, Nischal Acharya, Benne Holwerda, Andrew M. Hopkins, Kevin Pimbblet   +7 more
doaj   +1 more source