Results 41 to 50 of about 771 (176)

Galaxy-wide radio-induced feedback in a radio-quiet quasar [PDF]

Monthly Notices of the Royal Astronomical Society, 2017
We report the discovery of a radio quiet type 2 quasar (SDSS J165315.06+234943.0 nicknamed the "Beetle" at z=0.103) with unambiguous evidence for active galactic nucleus (AGN) radio induced feedback acting across a total extension of ~46 kpc and up to ~26 kpc from the AGN.
M. Villar-Martín, B. Emonts, A. Cabrera Lavers, C. Tadhunter, D. Mukherjee, A. Humphrey, J. Rodríguez Zaurín, C. Ramos Almeida, M. Pérez Torres, P. Bessiere   +9 more
openaire   +6 more sources

AAPM task group report 302: Surface‐guided radiotherapy

Medical Physics, Volume 49, Issue 4, Page e82-e112, April 2022., 2022
Abstract The clinical use of surface imaging has increased dramatically, with demonstrated utility for initial patient positioning, real‐time motion monitoring, and beam gating in a variety of anatomical sites. The Therapy Physics Subcommittee and the Imaging for Treatment Verification Working Group of the American Association of Physicists in Medicine
Hania A. Al‐Hallaq, Laura Cerviño, Alonso N. Gutierrez, Amanda Havnen‐Smith, Susan A. Higgins, Malin Kügele, Laura Padilla, Todd Pawlicki, Nicholas Remmes, Koren Smith, Xiaoli Tang, Wolfgang A. Tomé   +11 more
wiley   +1 more source

Clear evidence for intranight optical variability in radio-quiet quasars [PDF]

, 2003
We present new clues to the problem of the radio loudness dichotomy arising from an extensive search for intranight optical variability in seven sets of optically luminous radio-quiet quasars and (radio-loud) BL Lacertae objects, which are matched in ...
Ram Sagar,, C. S. Stalin, Wiita, Paul J., null Gopal-Krishna, Ram Sagar, Stalin, C. S., Gopal-Krishna,, Paul J. Wiita   +7 more
core   +1 more source

Radio‐quiet Red Quasars

The Astrophysical Journal, 1999
We have performed a successful targeted search for a population of red, radio-quiet, and probably absorbed quasars. Radio-quiet, optically red ROSAT PSPC X-ray sources brighter than 1 × 10-13 ergs cm-2 s-1 were searched for red (O-E > 2.0, O ≤ 20) counterparts in the Automated Plate-measuring Machine catalog of Palomar Sky Survey objects. Of 45 objects
Dong‐Woo Kim, Martin Elvis
openaire   +1 more source

Herschel-ATLAS*: far-infrared properties of radio-loud and radio-quiet quasars [PDF]

, 2014
We have constructed a sample of radio-loud and radio-quiet quasars from the Faint Images Radio Sky at Twenty-one centimetres and the Sloan Digital Sky Survey Data Release 7, over the Herschel-ATLAS Phase 1 area (9h, 12h and 14. h 5).
de Zotti, G, Dunne, Loretta, Valiante, Elisabetta, Stevens, JA, Ibar, E, Valiante, E, de Zotti, G., Maddox, S., Smith, DJB, Ivison, RJ, Jarvis, M. J., Valiante, E., Smith, Daniel, Jarvis, M.J., Hardcastle, M.J., Hardcastle, M. J., Smith, M. W. L., Ibar, E., Smith, D. J. B., Hardcastle, MJ, Eales, Stephen Anthony, Ivison, R. J., Kalfountzou, E, Eales, S., Smith, Matthew W., Stevens, J.A., Maddox, S, Maddox, Steve, Kalfountzou, E., Bourne, N., Jarvis, MJ, Dunne, L., Ivison, R.J., Stevens, J. A., Bourne, N, Eales, S, Dunne, L, Smith, MWL   +37 more
core   +1 more source

Magnetic Fields in Radio-Quiet Quasars [PDF]

Symposium - International Astronomical Union, 1990
As an hypothesis the sharp far–infrared turnovers in the spectra of several radio–quiet galactic nuclei [1–3] are attributed to the modifications of synchrotron emission arising from the presence of a thermal background plasma. We calculate the synchrotron emission from a power-law distribution of relativistic electrons N(γ) = Noγ–s in a large–scale ...
R. Schlickeiser, A. Crusius-Wătzel
openaire   +1 more source

Optical Microvariability in Radio Quiet Quasars [PDF]

Symposium - International Astronomical Union, 1994
We have observed 11 radio quiet QSOs (RQQSOs) to see if they exhibit intranight variability in the optical. The detection of such microvariability would support models in which fluctuations on accretion disks are dominant, while if it is never present, models based on relativistic jets would be favored.
Paul J. Wiita, null Gopal-Krishna, Ram Sagar   +2 more
openaire   +1 more source

Optical variability patterns of radio-quiet and radio-loud quasars [PDF]

, 2016
We analyzed the light curves (LCs) of several radio-quiet and radio-loud quasars belonging to the same parameter space volume in the 4D Eigenvector 1 (4DE1) quasar sequence, using data from the Catalina Real-time Transient Survey (CRTS).
A. Del Olmo, P. Marziani, N. Bon, Bon, N., D'Onofrio, M., Del Olmo, A., Bon, E., D. Dultzin, MARZIANI, Paola, A. Grieco, Dultzin, D., E. Bon, M. D'Onofrio, Grieco, A.   +13 more
core   +1 more source

Phylogenetic Analyses of Quasars and Galaxies

Frontiers in Astronomy and Space Sciences, 2017
Phylogenetic approaches have proven to be useful in astrophysics. We have recently published a Maximum Parsimony (or cladistics) analysis on two samples of 215 and 85 low-z quasars (z < 0.7) which offer a satisfactory coverage of the Eigenvector 1 ...
Didier Fraix-Burnet, Mauro D'Onofrio, Paola Marziani   +2 more
doaj   +1 more source

A NEW ORIENTATION INDICATOR FOR RADIO-QUIET QUASARS [PDF]

The Astrophysical Journal, 2011
The velocities of the [O III] 5007 and optical Fe II emission lines, measured relative to the systemic redshifts of 2265 QSOs by Hu et al. (2008), show the signature of a disklike BLR structure with polar outflows. Objects with large [O III] outflows show no Fe II offset velocity and are seen pole-on.
openaire   +2 more sources