Results 131 to 140 of about 6,949,336 (206)

Color-redshift relations and photometric redshift estimations of quasars in large sky surveys

, 2004
With a recently constructed composite quasar spectrum and the chi(2) minimization technique, we describe a general method for estimating the photometric redshifts of a large sample of quasars by deriving theoretical color-redshift relations and comparing
Zhang, W, Wu, XB, Zhou, X
core  

Detection of companion galaxies around hot dust-obscured hyper-luminous galaxy W0410-0913. [PDF]

Nat Commun, 2022
Ginolfi M, Piconcelli E, Zappacosta L, Jones GC, Pentericci L, Maiolino R, Travascio A, Menci N, Carniani S, Rizzo F, Arrigoni Battaia F, Cantalupo S, De Breuck C, Graziani L, Knudsen K, Laursen P, Mainieri V, Schneider R, Stanley F, Valiante R, Verhamme A.   +20 more
europepmc   +1 more source

First rest-frame infrared spectrum of a z > 7 quasar: MIRI-MRS observations of J1120+0641

, 2023
Bosman S, Álvarez-Márquez J, Colina L, Walter F, Herrero AA, Ward M, Östlin G, Greve T, Wright G, Bik A, Boogaard L, Caputi K, Costantin L, Eckart A, Marin MG, Gillman S, Güdel M, Henning T, Hjorth J, Iani E, Ilbert O, Jermann I, Labiano A, Lagage P, Langeroodi D, Peißker F, Ray T, Rinaldi P, Topinka M, Dishoeck Ev, Werf Pvd, Vandenbussche B.   +31 more
europepmc   +1 more source

The Ellis-Baldwin test. [PDF]

Philos Trans A Math Phys Eng Sci
Secrest NJ.
europepmc   +1 more source

Selections of High Redshift Quasars with Multi-wavelength Data

, 2015
학위논문(박사)--서울대학교 대학원 :자연과학대학 물리·천문학부,2015. 8. 임명신.High redshift quasars (z > 5) hold keys to understanding the evolution of the universe in its early stage.
전이슬
core  

Challenges and opportunities for time-delay cosmography with multi-messenger gravitational lensing. [PDF]

Philos Trans A Math Phys Eng Sci
Birrer S, Smith GP, Shajib AJ, Ryczanowski D, Arendse N.   +4 more
europepmc   +1 more source

{\Lambda}CDM-Rastall cosmology revisited: constraints from a recent Quasars datasample

In this paper we study the impact of a recent quasar datasample in the constraint of the free parameters of an extension of general relativity. As a ruler to test, we use Rastall gravity in the context of background cosmology being a simple extension to ...
Hernández-Almada, Alberto, Jacobo, Kyra, Astorga-Moreno, Jesús, Arteaga, Salvador, García-Aspeitia, Miguel Ángel   +4 more
core  

Modification of Premises for the Black Hole Information Paradox Caused by Topological Constraints in the Event Horizon Vicinity. [PDF]

Entropy (Basel)
Jacak JE.
europepmc   +1 more source

VLBI imaging of extremely high redshift quasars at 5 GHz

, 1999
. We present very long baseline interferometry (VLBI) images of ten very high redshift (z ? 3) quasars at 5 GHz. The sources 0004+139, 0830+101, 0906+041, 0938+119 and 1500+045 were observed in September 1992 using a global VLBI array, while 0046+063 ...
Frey, S., McMahon, R.G., K. I. Kellermann, I. M. Hook, I. I. K. Pauliny-toth, R. T. Schilizzi, Paragi, Z., Gurvits, L.I., S. Frey, R. G. Mcmahon, L. I. Gurvits, Z. Paragi, Schilizzi, R.T., Hook, I.M., Kellermann, K.I., Pauliny-Toth, I.I.K.   +15 more
core  

f(Q) gravity as a possible resolution of the H₀ and S₈ tensions with DESI DR2. [PDF]

Sci Rep
Kavya NS, Swagat Mishra S, Sahoo PK.
europepmc   +1 more source