Results 41 to 50 of about 512 (214)
Revisiting X-Ray-bright Optically Normal Galaxies with the Chandra Source Catalog
The Astrophysical Journal, 2023 X-ray bright optically normal galaxies (XBONGs) are galaxies with X-ray luminosities consistent with those of active galactic nuclei (AGNs) but no evidence of AGN optical emission lines.
Dong-Woo Kim +5 more
doaj +1 more source
Redshifts and lens profile for the double quasar QJ 0158-4325 [PDF]
Astronomy & Astrophysics, 2009 Research Note, Accepted for publication in A& ...
Faure C. +7 more
openaire +3 more sources
Parsec-Scale Structure in the Nuclei of Double-Lobed Radio Quasars [PDF]
, 1986 A complete sample of double-lobed quasars is defined, which is believed to be randomly oriented and which contains many objects with central components accessible to very-long-baseline interferometry (VLSI). The purpose of defining the sample in this way
Hough, David Hans
core +1 more source
Modelling accretion disk winds in quasars
, 2014 Outflows are ubiquitous in active galactic nuclei (AGN). They can take the form of either dramatic radio jets, which extend vast distances into the inter-galactic medium, or of much smaller scale winds - whose existence can be inferred only indirectly ...
Nick Higginbottom +1 more
core +1 more source
A tale of two double quasars: Hubble constant tension or biases? [PDF]
, 2023 For a flat ΛCDM (standard) cosmology, a small sample of gravitationally lensed quasarswith measured time delays has recently provided a value of the Hubble constantH0intension with thePlanckflat ΛCDM result. Trying to check if this tension is real or not,
Goicoechea Santamaría, Luis Julián +1 more
core +1 more source
The prevalence of FRI radio quasars
, 2007 We present deep, multi-VLA-configuration radio images for a set of 18 quasars, having redshifts between 0.36 and 2.5, from the 7C quasar survey. Approximately one quarter of these quasars have FRI-type twin-jet structures and the remainder are a broad ...
Blundell, Katherine +7 more
core +1 more source
The Milliarcsecond Structure of Radio Galaxies and Quasars [PDF]
, 1982 Hybrid maps of the nuclei of radio galaxies and quasars show a variety of morphologies. Among compact sources, two structures are common: an asymmetric, “core-jet” morphology (eg, 3C 273), and an “equal double” morphology with two separated, similar ...
T. J. Pearson +3 more
core +1 more source
Cosmology from double quasars [PDF]
, 2023 Los sistemas lente gravitacional han demostrado ser altamente valiosos en el estudio de la distribución de masa de las galaxias que actúan como deflectores, y tienen un gran potencial como herramienta para medir la constante de Hubble (H0).
Ruiz Hinojosa, Eleana de los Ángeles
core
The double quasar Q2138-431: detection of a lensing galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 2021 ABSTRACT This paper reviews the question of whether the wide separation double quasar Q2138-431 is a gravitational lens. From early work, the two quasar images are known to have almost identical spectra and redshifts, but no lensing galaxy has so far been detected.
openaire +2 more sources
Ionized Gas Outflows from the MAGNUM Survey: NGC 1365 and NGC 4945
Frontiers in Astronomy and Space Sciences, 2017 AGN feedback, acting through strong outflows accelerated in the nuclear region of AGN hosts, is invoked as a key ingredient for galaxy evolution by many models to explain the observed BH-galaxy scaling relations.
Giacomo Venturi +11 more
doaj +1 more source