Deep Broadband Observations of the Distant Gamma-ray Blazar PKS 1424+240

S. Archambault; T. Aune; B. Behera; M. Beilicke; W. Benbow; K. Berger; R. Bird; J. Biteau; V. Bugaev; K. Byrum; J.V Cardenzana; M. Cerruti; X. Chen; L. Ciupik; M.P. Connolly; W. Cui; J. Dumm; M. Errando; A. Falcone; S. Federici; Q. Feng; J.P. Finley; H. Fleischhack; L. Fortson; A. Furniss; N. Galante; G. H. Gillanders; S. Griffin; S.T. Griffiths; J. Grube; G. Gyuk; D. Hanna; J. Holder; G. Hughes; T.B. Humensky; C.A. Johnson; P. Kaaret; M. Kertzman; Y. Khassen; D. Kieda; H. Krawczynski; F. Krennrich; S. Kumar; M.J. Lang; A.S Madhavan; G. Maier; A. Mccann; K. Meagher; P. Moriarty; R. Mukherjee; D. Nieto; A. O'Faoláin de Bhróithe; R.A. Ong; A.N. Otte; N. Park; M. Pohl; A. Popkow; H. Prokoph; J. Quinn; K. Ragan; J. Rajotte; L.C. Reyes; P.T. Reynolds; G.T. Richards; E. Roache; G. H. Sembroski; K. Shahinyan; D. Staszak; I. Telezhinsky; J.V. Tucci; J. Tyler; A. Varlotta; V. V. Vassiliev; S. Vincent; S.P. Wakely; A. Weinstein; R. Welsing; A. Wilhelm; D.A. Williams; M. Ackermann; M. Ajello; A. Albert; L. Baldini; D. Bastieri; R. Bellazzini; E. Bissaldi; J. Bregeon; R. Buehler; S. Buson; G.A. Caliandro; R.A. Cameron; P.A. Caraveo; E. Cavazzuti; E. Charles; J. Chiang; S. Ciprini; R. Claus; S. Cutini; F. d'Ammando; A. de Angelis; F. de Palma; C.D. Dermer; S.W. Digel; L. Di Venere; P.S. Drell; C. Favuzzi; A. Franckowiak; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; F. Giordano; M. Giroletti; I.A. Grenier; S. Guiriec; T. Jogler; M. Kuss; S. Larsson; L. Latronico; F. Longo; F. Loparco; P. Lubrano; G.M. Madejski; M. Mayer; M.N. Mazziotta; P.F. Michelson; T. Mizuno; M.E. Monzani; A. Morselli; S. Murgia; E. Nuss; T. Ohsugi; J.F. Ormes; D. Paneque; J.S. Perkins; F. Piron; G. Pivato; S. Rainò; M. Razzano; A. Reimer; O. Reimer; S. Ritz; M. Schaal; C. Sgrò; E.J. Siskind; P. Spinelli; H. Takahashi; L. Tibaldo; M. Tinivella; E. Troja; G. Vianello; M. Werner; M. Wood

doi:10.1088/2041-8205/785/1/L16

Journal Articles The Astrophysical journal letters Year : 2014

Deep Broadband Observations of the Distant Gamma-ray Blazar PKS 1424+240

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S. Archambault

Function : Author

T. Aune

Function : Author

B. Behera

Function : Author

M. Beilicke

Function : Author

W. Benbow

Function : Author

K. Berger

Function : Author

R. Bird

Function : Author

J. Biteau

Function : Author

V. Bugaev

Function : Author

K. Byrum

Function : Author

J.V Cardenzana

Function : Author

M. Cerruti

Function : Author
PersonId : 763111
ORCID : 0000-0001-7891-699X
IdRef : 169860604

X. Chen

Function : Author

L. Ciupik

Function : Author

M.P. Connolly

Function : Author

W. Cui

Function : Author

J. Dumm

Function : Author

M. Errando

Function : Author

A. Falcone

Function : Author

S. Federici

Function : Author

Q. Feng

Function : Author

J.P. Finley

Function : Author

H. Fleischhack

Function : Author

L. Fortson

Function : Author

A. Furniss

Function : Author

N. Galante

Function : Author

G. H. Gillanders

Function : Author

S. Griffin

Function : Author

S.T. Griffiths

Function : Author

J. Grube

Function : Author

G. Gyuk

Function : Author

D. Hanna

Function : Author

J. Holder

Function : Author

G. Hughes

Function : Author

T.B. Humensky

Function : Author

C.A. Johnson

Function : Author

P. Kaaret

Function : Author

M. Kertzman

Function : Author

Y. Khassen

Function : Author

D. Kieda

Function : Author

H. Krawczynski

Function : Author

F. Krennrich

Function : Author

S. Kumar

Function : Author
PersonId : 755286
ORCID : 0000-0002-1065-9883

M.J. Lang

Function : Author

A.S Madhavan

Function : Author

G. Maier

Function : Author

A. Mccann

Function : Author

K. Meagher

Function : Author

P. Moriarty

Function : Author

R. Mukherjee

Function : Author

D. Nieto

Function : Author

A. O'Faoláin de Bhróithe

Function : Author

R.A. Ong

Function : Author

A.N. Otte

Function : Author

N. Park

Function : Author

M. Pohl

Function : Author

A. Popkow

Function : Author

H. Prokoph

Function : Author

J. Quinn

Function : Author

K. Ragan

Function : Author

J. Rajotte

Function : Author

L.C. Reyes

Function : Author

P.T. Reynolds

Function : Author

G.T. Richards

Function : Author

E. Roache

Function : Author

G. H. Sembroski

Function : Author

K. Shahinyan

Function : Author

D. Staszak

Function : Author

I. Telezhinsky

Function : Author

J.V. Tucci

Function : Author

J. Tyler

Function : Author

A. Varlotta

Function : Author

V. V. Vassiliev

Function : Author

S. Vincent

Function : Author

S.P. Wakely

Function : Author

A. Weinstein

Function : Author

R. Welsing

Function : Author

A. Wilhelm

Function : Author

D.A. Williams

Function : Author

M. Ackermann

Function : Author

M. Ajello

Function : Author

A. Albert

Function : Author
PersonId : 1159516
IdHAL : arnauld-albert
ORCID : 0000-0002-3556-1452
IdRef : 060741724

L. Baldini

Function : Author

D. Bastieri

Function : Author

R. Bellazzini

Function : Author

E. Bissaldi

Function : Author

J. Bregeon

Function : Author
PersonId : 741214
IdHAL : johan-bregeon
ORCID : 0000-0002-6790-5328
IdRef : 095856943

Laboratoire Univers et Particules de Montpellier

R. Buehler

Function : Author

S. Buson

Function : Author

G.A. Caliandro

Function : Author

R.A. Cameron

Function : Author

P.A. Caraveo

Function : Author

E. Cavazzuti

Function : Author

E. Charles

Function : Author

J. Chiang

Function : Author

S. Ciprini

Function : Author

R. Claus

Function : Author

S. Cutini

Function : Author

F. d'Ammando

Function : Author

A. de Angelis

Function : Author

F. de Palma

Function : Author

C.D. Dermer

Function : Author

S.W. Digel

Function : Author

L. Di Venere

Function : Author
PersonId : 769090
ORCID : 0000-0003-0703-824X

P.S. Drell

Function : Author

C. Favuzzi

Function : Author

A. Franckowiak

Function : Author

P. Fusco

Function : Author

F. Gargano

Function : Author

D. Gasparrini

Function : Author

N. Giglietto

Function : Author
PersonId : 755413
ORCID : 0000-0002-9021-2888

F. Giordano

Function : Author

M. Giroletti

Function : Author

I.A. Grenier

Function : Author

Astrophysique Interprétation Modélisation

S. Guiriec

Function : Author

T. Jogler

Function : Author

M. Kuss

Function : Author

S. Larsson

Function : Author

L. Latronico

Function : Author

F. Longo

Function : Author
PersonId : 755442
ORCID : 0000-0003-2501-2270

F. Loparco

Function : Author

P. Lubrano

Function : Author

G.M. Madejski

Function : Author

M. Mayer

Function : Author

M.N. Mazziotta

Function : Author

P.F. Michelson

Function : Author

T. Mizuno

Function : Author

M.E. Monzani

Function : Author

A. Morselli

Function : Author

S. Murgia

Function : Author

E. Nuss

Function : Author

Laboratoire Univers et Particules de Montpellier

T. Ohsugi

Function : Author

J.F. Ormes

Function : Author

D. Paneque

Function : Author
PersonId : 755279
ORCID : 0000-0002-2830-0502

J.S. Perkins

Function : Author

F. Piron

Function : Author
PersonId : 172749
IdHAL : frederic-piron
ORCID : 0000-0001-6885-7156

Laboratoire Univers et Particules de Montpellier

G. Pivato

Function : Author

S. Rainò

Function : Author

M. Razzano

Function : Author

A. Reimer

Function : Author
PersonId : 755465
ORCID : 0000-0001-8604-7077

O. Reimer

Function : Author

S. Ritz

Function : Author

M. Schaal

Function : Author

C. Sgrò

Function : Author

E.J. Siskind

Function : Author

P. Spinelli

Function : Author

H. Takahashi

Function : Author

L. Tibaldo

Function : Author

M. Tinivella

Function : Author

E. Troja

Function : Author

G. Vianello

Function : Author

M. Werner

Function : Author
PersonId : 755168
ORCID : 0000-0002-6473-0243

M. Wood

Function : Author

Abstract

We present deep VERITAS observations of the blazar PKS 1424+240, along with contemporaneous Fermi Large Area Telescope, Swift X-ray Telescope, and Swift UV Optical Telescope data between 2009 February 19 and 2013 June 8. This blazar resides at a redshift of z ≥ 0.6035, displaying a significantly attenuated gamma-ray flux above 100 GeV due to photon absorption via pair-production with the extragalactic background light. We present more than 100 hr of VERITAS observations over three years, a multiwavelength light curve, and the contemporaneous spectral energy distributions. The source shows a higher flux of (2.1 ± 0.3) × 10–7 photons m–2 s–1 above 120 GeV in 2009 and 2011 as compared to the flux measured in 2013, corresponding to (1.02 ± 0.08) × 10–7 photons m–2 s–1 above 120 GeV. The measured differential very high energy (VHE; E ≥ 100 GeV) spectral indices are Γ = 3.8 ± 0.3, 4.3 ± 0.6 and 4.5 ± 0.2 in 2009, 2011, and 2013, respectively. No significant spectral change across the observation epochs is detected. We find no evidence for variability at gamma-ray opacities of greater than τ = 2, where it is postulated that any variability would be small and occur on timescales longer than a year if hadronic cosmic-ray interactions with extragalactic photon fields provide a secondary VHE photon flux. The data cannot rule out such variability due to low statistics.

Keywords

BL Lacertae objects: individual (PKS 1424+240)-cosmic background radiation gamma rays: galaxies photon: flux photon: absorption gamma ray: flux detector: optical X-ray: detector cosmic radiation: interaction spectral blazar VHE VERITAS pair production statistics background redshift opacity

Domains

Astrophysics [astro-ph]

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https://hal.science/hal-02024305

Submitted on : Tuesday, February 19, 2019-9:20:54 AM

Last modification on : Monday, December 2, 2024-2:48:11 PM

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hal-02024305 , version 1 (19-02-2019)

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HAL Id : hal-02024305 , version 1
ARXIV : 1403.4308
DOI : 10.1088/2041-8205/785/1/L16
INSPIRE : 1286279

Cite

S. Archambault, T. Aune, B. Behera, M. Beilicke, W. Benbow, et al.. Deep Broadband Observations of the Distant Gamma-ray Blazar PKS 1424+240. The Astrophysical journal letters, 2014, 785, pp.L16. ⟨10.1088/2041-8205/785/1/L16⟩. ⟨hal-02024305⟩

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Deep Broadband Observations of the Distant Gamma-ray Blazar PKS 1424+240

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