High-redshift active galactic nuclei and the next decade of Chandra and XMM-Newton
Sign Up to like & getrecommendations! Published in 2017 at "Astronomische Nachrichten"
DOI: 10.1002/asna.201713337
Abstract: We briefly review how X-ray observations of high-redshift active galactic nuclei (AGNs) at z = 4–7 have played a critical role in understanding their basic demographics as well as their physical processes; for example, absorption… read more here.
Keywords: high redshift; galactic nuclei; active galactic; xmm newton ... See more keywords
Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Astrophysics and Astronomy"
DOI: 10.1007/s12036-019-9583-4
Abstract: We report optical observations of TGSS J1054+5832, a candidate high-redshift ($$z=4.8\pm 2$$z=4.8±2) steep-spectrum radio galaxy, in r and i bands, using the faint object spectrograph and camera mounted on 3.6-m Devasthal Optical Telescope (DOT). The… read more here.
Keywords: high redshift; galaxy; radio; telescope ... See more keywords
Fast jet proper motion discovered in a blazar at z=4.72
Sign Up to like & getrecommendations! Published in 2020 at "Science Bulletin"
DOI: 10.1016/j.scib.2020.01.008
Abstract: High-resolution observations of high-redshift ($z>4$) radio quasars offer a unique insight into jet kinematics at early cosmological epochs, as well as constraints on cosmological model parameters. Due to the general weakness of extremely distant objects… read more here.
Keywords: kinematics; jet proper; jet; high redshift ... See more keywords
The GLEAMing of the first supermassive black holes: II. A new sample of high-redshift radio galaxy candidates
Sign Up to like & getrecommendations! Published in 2022 at "Publications of the Astronomical Society of Australia"
DOI: 10.1017/pasa.2022.42
Abstract: Abstract While unobscured and radio-quiet active galactic nuclei are regularly being found at redshifts $z > 6$ , their obscured and radio-loud counterparts remain elusive. We build upon our successful pilot study, presenting a new… read more here.
Keywords: galaxy; high redshift; new sample; survey ... See more keywords
The high-redshift Universe with Spitzer
Sign Up to like & getrecommendations! Published in 2020 at "Nature Astronomy"
DOI: 10.1038/s41550-020-1104-5
Abstract: When did galaxies start forming stars? What is the role of distant galaxies in galaxy formation models and the epoch of reionization? What are the conditions in typical star-forming galaxies at redshifts ≳4? Why is… read more here.
Keywords: high redshift; universe spitzer; spitzer; redshift universe ... See more keywords
Extreme quasars at high redshift
Sign Up to like & getrecommendations! Published in 2018 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201833541
Abstract: Context:Quasars radiating at extreme Eddington ratios (xA) are likely a prime mover of galactic evolution and have been hailed as potential distance indicators. Their properties are still scarcely known. Aims:We test the effectiveness of the… read more here.
Keywords: siiii 1892; high redshift; quasars high; extreme quasars ... See more keywords
Gravitational Lensing and Dynamics (GLaD): combined analysis to unveil properties of high-redshift galaxies
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202037929
Abstract: The dynamical modelling of integral field unit (IFU) stellar kinematics is a powerful tool to unveil the dynamical structure and mass build-up of galaxies in the local Universe, while gravitational lensing is nature’s cosmic telescope… read more here.
Keywords: high redshift; mass; redshift galaxies; properties high ... See more keywords
A puzzling non-detection of [O III] and [C II] from a z ≈ 7.7 galaxy observed with ALMA
Sign Up to like & getrecommendations! Published in 2021 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202038180
Abstract: Context. Characterizing the galaxy population in the early Universe holds the key to understanding the evolution of these objects and the role they played in cosmic reionization. However, there have been very few observations at… read more here.
Keywords: gsd 3811; galaxy; iii; high redshift ... See more keywords
Cosmology at high redshift — a probe of fundamental physics
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/12/049
Abstract: An observational program focused on the high redshift (2 read more here.
Keywords: cosmology high; physics cosmology; physics; cosmology ... See more keywords
A method for checking high-redshift identification of radio AGNs
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa2132
Abstract: In large-scale optical spectroscopic surveys, there are many objects found to have multiple redshift measurements due to the weakness of their emission lines and the different automatic identification algorithms used. These include some suspicious high-redshift… read more here.
Keywords: high redshift; radio; jet; redshift identification ... See more keywords
What drives the redshift evolution of strong emission line ratios?
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa259
Abstract: We study the physical mechanisms that cause the offset between low-redshift and high-redshift galaxies on the [OIII]/H$\beta$ versus [NII]/H$\alpha$ ``Baldwin, Phillips & Terlevich'' (BPT) diagram using a sample of local analogues of high-redshift galaxies. These… read more here.
Keywords: high redshift; radiation field; redshift galaxies; redshift ... See more keywords