Fermi /lat Discovery of Gamma-ray Emission from the Flat-spectrum Radio Quasar Pks 1454-354

نویسندگان

  • A. A. Abdo
  • M. Ackermann
  • W. B. Atwood
  • M. Axelsson
  • L. Baldini
  • J. Ballet
  • G. Barbiellini
  • D. Bastieri
  • B. M. Baughman
  • K. Bechtol
  • R. Bellazzini
  • B. Berenji
  • R. D. Blandford
  • E. D. Bloom
  • G. Bogaert
  • E. Bonamente
  • A. W. Borgland
  • J. Bregeon
  • A. Brez
  • M. Brigida
  • P. Bruel
  • T. H. Burnett
  • G. A. Caliandro
  • R. A. Cameron
  • P. A. Caraveo
  • J. M. Casandjian
  • E. Cavazzuti
  • C. Cecchi
  • E. Charles
  • A. Chekhtman
  • C. C. Cheung
  • J. Chiang
  • S. Ciprini
  • R. Claus
  • J. Cohen-Tanugi
  • S. Colafrancesco
  • J. Conrad
  • L. Costamante
  • S. Cutini
  • C. D. Dermer
  • A. de Angelis
  • F. de Palma
  • S. W. Digel
  • E. do Couto e Silva
  • P. S. Drell
  • R. Dubois
  • D. Dumora
  • Y. Edmonds
  • C. Farnier
  • C. Favuzzi
  • E. C. Ferrara
  • P. Fleury
  • W. B. Focke
  • L. Foschini
  • M. Frailis
  • L. Fuhrmann
  • Y. Fukazawa
  • S. Funk
  • P. Fusco
  • F. Gargano
  • D. Gasparrini
  • N. Gehrels
  • S. Germani
  • B. Giebels
  • N. Giglietto
  • F. Giordano
  • M. Giroletti
  • T. Glanzman
  • G. Godfrey
  • I. A. Grenier
  • M.-H. Grondin
  • J. E. Grove
  • L. Guillemot
  • S. Guiriec
  • A. K. Harding
  • R. C. Hartman
  • M. Hayashida
  • E. Hays
  • S. E. Healey
  • R. E. Hughes
  • G. Jóhannesson
  • A. S. Johnson
  • R. P. Johnson
  • W. N. Johnson
  • M. Kadler
  • T. Kamae
  • H. Katagiri
  • J. Kataoka
  • N. Kawai
  • M. Kerr
  • J. Knödlseder
  • M. L. Kocian
  • F. Kuehn
  • M. Kuss
  • L. Latronico
  • S.-H. Lee
  • M. Lemoine-Goumard
  • F. Longo
  • F. Loparco
  • B. Lott
  • M. N. Lovellette
  • P. Lubrano
  • G. M. Madejski
  • A. Makeev
  • M. Marelli
  • M. N. Mazziotta
  • J. E. McEnery
  • S. McGlynn
  • C. Meurer
  • P. F. Michelson
  • W. Mitthumsiri
  • T. Mizuno
  • A. A. Moiseev
  • C. Monte
  • M. E. Monzani
  • A. Morselli
  • I. V. Moskalenko
  • S. Murgia
  • P. L. Nolan
  • E. Nuss
  • M. Ohno
  • T. Ohsugi
  • R. Ojha
  • N. Omodei
  • E. Orlando
  • J. F. Ormes
  • D. Paneque
  • J. H. Panetta
  • D. Parent
  • M. Pepe
  • M. Pesce-Rollins
  • F. Piron
  • T. A. Porter
  • S. Rainò
  • R. Rando
  • M. Razzano
  • A. Reimer
  • O. Reimer
  • T. Reposeur
  • L. C. Reyes
  • S. Ritz
  • L. S. Rochester
  • A. Y. Rodriguez
  • R. W. Romani
  • M. Roth
  • F. Ryde
  • H. F.-W. Sadrozinski
  • R. Sambruna
  • D. Sanchez
  • A. Sander
  • P. M. Saz Parkinson
  • C. Sgrò
  • M. S. Shaw
  • E. J. Siskind
  • D. A. Smith
  • P. D. Smith
  • G. Spandre
  • P. Spinelli
  • J.-L. Starck
  • M. S. Strickman
  • D. J. Suson
  • H. Tajima
  • H. Takahashi
  • T. Tanaka
  • J. B. Thayer
  • J. G. Thayer
  • D. J. Thompson
  • L. Tibaldo
  • O. Tibolla
  • D. F. Torres
  • G. Tosti
  • A. Tramacere
  • T. L. Usher
  • N. Vilchez
  • V. Vitale
  • A. P. Waite
  • P. Wang
  • B. L. Winer
  • K. S. Wood
  • T. Ylinen
  • M. Ziegler
  • P. G. Edwards
  • M. M. Chester
  • D. N. Burrows
  • M. Hauser
  • S. Wagner
چکیده

We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy γ−ray (GeV) emission from the flat-spectrum radio quasar PKS 1454-354 (z = 1.424). On 4 September 2008 the source rose to a peak flux of (3.5±0.7)×10 ph cm s (E > 100 MeV) on a time scale of hours and then slowly dropped over the following two days. No significant spectral changes occurred during the flare. Fermi/LAT observations also showed that PKS 1454-354 is the most probable counterpart of the unidentified EGRET source 3EG J1500−3509. Multiwavelength measurements performed during the following days (7 September with Swift ; 6−7 September with the ground-based optical telescope ATOM ; 13 September with the Australia Telescope Compact Array) resulted in radio, optical, UV and X-ray fluxes greater than archival data, confirming the activity of PKS 1454-354. Subject headings: quasars: individual (PKS 1454-354) – galaxies: active – gamma rays: observations * Corresponding author: L. Foschini, [email protected] 1 National Research Council Research Associate 2 Space Science Division, Naval Research Laboratory, Washington, DC 20375 3 W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Laboratory, Stanford University, Stanford, CA 94305 4 Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064 5 The Oskar Klein Centre for Cosmo Particle Physics, AlbaNova, SE-106 91 Stockholm, Sweden 6 Department of Astronomy, Stockholm University, SE-106 91 Stockholm, Sweden 7 Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy 8 Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d’Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France 9 Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy 10 Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy 11 Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy 12 Dipartimento di Fisica “G. Galilei”, Università di Padova, SLAC-PUB-13619

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

discovery of gamma - ray emission from a relativistic jet in the narrow - line Seyfert 1 quasar

We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy gamma-ray emission from the peculiar quasar PMN J0948+0022 (z = 0.585± 0.001). Contrary to the expectations, the optical spectrum of this quasar shows only narrow lines [FWHM(Hβ) ∼ 1500 km/s] and the typical characteristics of narrow-line Seyfert 1 type galaxies. However, the str...

متن کامل

Fermi /lat Discovery of Gamma-ray Emission from a Relativistic Jet in the Narrow-line Quasar Pmn J0948+0022

We report the discovery by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope of high-energy γ−ray emission from the peculiar quasar PMN J0948+0022 (z = 0.5846). The optical spectrum of this object exhibits rather narrow Hβ (FWHM(Hβ)∼ 1500 km s), weak forbidden lines and is therefore classified as a narrow-line type I quasar. This class of objects is thought to have rela...

متن کامل

First evidence of a gravitational lensing-induced echo in gamma rays with Fermi LAT

The distant quasar PKS 1830-211 is known to be lensed by a z=0.89 foreground galaxy, and it is split into radio in two images with an Einstein ring. Intrinsic flux variations of the quasar are seen in the two images with a time delay caused by the different optical paths in the two images. The multiple images of a gravitational lensed AGN cannot be directly observed with high energy gamma-ray i...

متن کامل

keV Emission from PKS 2149 − 306 with BeppoSAX

A BeppoSAX observation of the z=2.34 quasar PKS2149−306 produced a strong signal in the high energy PDS instrument up to a maximum observed energy of nearly 50 keV, 150 keV in the quasar frame. The Beppo-SAX spectrum spans almost 3 decades (0.3−150 keV, quasar frame) and shows an extremely hard (α=0.4±0.05) X-ray spectrum above 3 keV (comparable to XJB the X-ray background slope), and either a ...

متن کامل

Jet Physics of Accreting Super-Massive Black Holes in the Era of the Fermi Gamma-ray Space Telescope

The Fermi Gamma-ray Space Telescope with its main instrument on-board, the Large Area Telescope (LAT), opened a new era in the study of high-energy emission from Active Galactic Nuclei (AGN). When combined with contemporaneous groundand space-based observations, Fermi-LAT achieves its full capability to characterize the jet structure and the emission mechanisms at work in radio-loud AGN with di...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2009