Results 101 to 110 of about 166 (155)

Exploring Quasar Variability with ZTF at 0 < z < 3: A Universal Relation with the Eddington Ratio

The Astrophysical Journal
Quasars, powered by accretion onto supermassive black holes (SMBHs), exhibit significant variability, offering insights into the physics of accretion and the properties of the central engines.
Hygor Benati Gonçalves, Swayamtrupta Panda, Thaisa Storchi Bergmann, Edward M. Cackett, Michael Eracleous   +4 more
doaj   +1 more source

Radio Spectra of Radio Quiet Quasars

The Astronomical Journal, 1996
Richard Barvainis, Colin Lonsdale, Robert Antonucci   +2 more
openaire   +1 more source

Powerful extragalactic jets dissipate their kinetic energy far from the central black hole. [PDF]

Nat Commun, 2020
Harvey ALW, Georganopoulos M, Meyer ET.
europepmc   +1 more source

Hot, Photoionized X-Ray Gas in Two Luminous Type 2 Quasars: Chandra-HST Evidence for a Wind-driven Sequence

The Astrophysical Journal
We present new Chandra/ACIS-S imaging spectroscopy of two luminous type 2 quasars (QSO2s), FIRST J120041.4+314745 ( z = 0.116) and 2MASX J13003807+5454367 ( z = 0.088), and compare their X-ray emission with Hubble Space Telescope [O  III ] λ 5007 ...
Anna Trindade Falcão, S. Kraemer, L. Feuillet, R. Middei, T. J. Turner, J. Reeves, V. Braito, A. Ptak, H. R. Schmitt, T. C. Fischer, D. M. Crenshaw, Luis C. Ho, M. Revalski, T. Storchi-Bergmann, M. Vestergaard, C. M. Gaskell, W. P. Maksym, M. Elvis, M. J. Ward, H. Netzer   +19 more
doaj   +1 more source

Determining the Spatial Origin of X-Ray and Optical Emission in the z = 3.1 Strongly Lensed Radio-quiet Quasar GraL J065904.1+162909 to Hundreds of Parsecs

The Astrophysical Journal
We perform milliarcsecond X-ray astrometry of the quadruply lensed radio-quiet quasar GraL J065904.1+162909 (J0659). This z _s  = 3.083 quasar is lensed into four images and was discovered with the second Data Release of the Gaia Space Observatory (Gaia ...
Júlia M. Sisk-Reynés, Daniel A. Schwartz, Anna Barnacka, Cristiana Spingola, Giulia Migliori   +4 more
doaj   +1 more source

X-Ray Emission Properties of a Compact Symmetric Object Sample

The Astrophysical Journal
We present a comprehensive analysis of the X-ray observations obtained from XMM-Newton and Chandra for a sample of bona-fide Compact Symmetric Objects (CSOs) to investigate their X-ray emission properties.
Ying-Ying Gan, Su Yao, Tan-Zheng Wu, Hai-Ming Zhang, Jin Zhang   +4 more
doaj   +1 more source

A New Member of the Fast and Furious Family: A Relativistic and Time-variable UV Outflow in a Luminous Quasar

The Astrophysical Journal
We report the fastest quasar outflow first detected in the ultraviolet, via variable C iv and Si iv absorption at outflow velocities −77,000 km s ^−1 to at least −90,000 km s ^−1 , in the radio-quiet quasar SDSS J231854.31+243954.2 (J2318).
Lucas M. Seaton, Patrick B. Hall, Liliana Flores, Paola Rodríguez Hidalgo, Marianna Veltri, Zezhou Zhu, Javier Serna, W. Niel Brandt, Scott Anderson, Roberto J. Assef, Eduardo Bañados, Catherine J. Grier, Yasaman Homayouni, Sean Morrison, C. Alenka Negrete, Amy L. Rankine, Jessie Runnoe, Donald P. Schneider, Yue Shen, Matthew Temple, Benny Trakhtenbrot, Jonathan R. Trump, Erik Weiss   +22 more
doaj   +1 more source

QSOFEED: Investigating warm molecular, low- and high-ionization atomic gas in six type-2 quasars with GTC/EMIR

Astronomy & Astrophysics
We present long-slit near-infrared spectroscopic observations of six nearby (z ∼ 0.1) radio-quiet type-2 quasars (QSO2s) from the Quasar Feedback (QSOFEED) sample.
Cezar P. H., Coloma Puga M., Ramos Almeida C., Acosta-Pulido J. A., Speranza G., Holden L. R., Tadhunter C. N., Zanchettin M. V., Audibert A.   +8 more
doaj   +1 more source

Multiwavelength analysis of the variability of the blazar 3C 273. [PDF]

Mon Not R Astron Soc, 2020
Fernandes S, Patiño-Álvarez VM, Chavushyan V, Schlegel EM, Valdés JR.   +4 more
europepmc   +1 more source

Supermassive Black Hole Winds in X-rays: SUBWAYS

Astronomy & Astrophysics
We present the X-ray analysis of coronal properties in a statistically representative sample of 23 mostly radio-quiet active galactic nuclei (AGN) from the SUpermassive Black holes Winds in X-rAYs campaign (SUBWAYS), focusing on quasars at redshifts 0.1 
Peluso S., Lanzuisi G., Comastri A., Brusa M., Giustini M., Miniutti G., Bianchi S., Gianolli V. E., Middei R., Petrucci P-O., Borrelli L., Amenta E., Bertola E., Vignali C., De Marco B., De Rosa A., Kraemer S., Kriss G., Krongold Y., Longinotti A. L., Mathur S., Merloni A., Nardini E., Panessa F., Piconcelli E., Ponti G., Ricci F., Tortosa A., Zappacosta L., Serafinelli R., Matzeu G. A.   +30 more
doaj   +1 more source