Results 11 to 20 of about 765,605 (153)
H i 21-cm absorption survey of quasar-galaxy pairs: distribution of cold gas aroundz < 0.4 galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 25 pages + 17 pages appendix, 12 figures, 5 tables, accepted for publication in ...
Dutta, R. +6 more
openaire +3 more sources
Discovery of spectacular quasar-driven superbubbles in red quasars. [PDF]
Sci Adv, 2023 Quasar-driven outflows on galactic scales are a routinely invoked ingredient for galaxy formation models. We report the discovery of ionized gas nebulae as traced by [O III] $\lambda$5007 AA emission surrounding three luminous red quasars at $z \sim 0.4$
Shen L +9 more
europepmc +2 more sources
First results from high redshift quasar searches in VIKING [PDF]
, 2012 This thesis presents the discovery of the first luminous z & 6.5 quasars in the VISTA kilo-degree Infrared Galaxy Survey (VIKING). After some basic quality control, quasar selection is investigated via use of initial data supplementedwith ...
Findlay, Joseph
core +4 more sources
THE QUASAR/GALAXY PAIR PKS 1327-206/ESO 1327-2041: ABSORPTION ASSOCIATED WITH A RECENT GALAXY MERGER [PDF]
The Astronomical Journal, 2011 Replaced with accepted version; 16 ...
Keeney, B. A. +3 more
openaire +2 more sources
A brief history of image sensors in the optical
Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023 Image sensors, most notably the Charge Coupled Device (CCD), have revolutionized observational astronomy as perhaps the most important innovation after photography. Since the 50th anniversary of the invention of the CCD has passed in 2019, it is time to review the development of detectors for the visible wavelength range, starting with the discovery of
Martin M. Roth
wiley +1 more source
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 +2 more
wiley +1 more source
Radio Line and Continuum Observations of Quasar-Galaxy Pairs and the Origin of Low Redshift Quasar Absorption Line Systems [PDF]
International Astronomical Union Colloquium, 1990 There are a number of known quasars for which our line of sight to the high redshift quasar passes within a few Holmberg radii of a low redshift galaxy. In a few of these cases, spectra of the quasar reveal absorption by gas associated with the low redshift galaxy. A number of these pairs imply absorption by gas which lies well outside the optical disk
C.L. Carilli +4 more
openaire +1 more source
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 +2 more
wiley +1 more source
Searching for overlooked TDEs in the 4XMM catalogue
Astronomische Nachrichten, Volume 344, Issue 4, May 2023., 2023 Abstract Tidal disruption events (TDEs) are usually discovered as bright transients, either in the X‐ray or optical/UV band. These events are often characterized by a “super‐soft” emission in the X‐ray band, which has not been observed in any other extragalactic source, with few exceptions (novae and supersoft active galactic nuclei, AGN), which can ...
Andrea Sacchi +2 more
wiley +1 more source
A Quasar–Galaxy Mixing Diagram: Quasar Spectral Energy Distribution Shapes in the Optical to Near-Infrared [PDF]
, 2013 We define a quasar–galaxy mixing diagram using the slopes of their spectral energy distributions (SEDs) from 1 μm to 3000 Å and from 1 to 3 μm in the rest frame.
Bongiorno, Angela +6 more
core +2 more sources