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A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations

Abdalla, H.; Abramowski, A.; Aharonian, F.; Benkhali, F. Ait; Akhperjanian, A.G.; Angüner, E.O.; Arrieta, M.; Aubert, P.; Backes, M.; Balzer, A.; Barnard, M.; Becherini, Y.; Tjus, J. Becker; Berge, D.; Bernhard, S.; Bernlöhr, K.; Birsin, E.; Blackwell, R.; Böttcher, M.; Boisson, C.; Bolmont, J.; Bordas, P.; Bregeon, J.; Brun, F.; Brun, P.; Bryan, M.; Bulik, T.; Capasso, M.; Carr, J.; Casanova, S.; Chadwick, P.M.; Chakraborty, N.; Chalme-Calvet, R.; Chaves, R.C.G.; Chen, A.; Chevalier, J.; Chrétien, M.; Colafrancesco, S.; Cologna, G.; Condon, B.; Conrad, J.; Couturier, C.; Cui, Y.; Davids, I.D.; Degrange, B.; Deil, C.; deWilt, P.; Dickinson, H.J.; Djannati-Ataï, A.; Domainko, W.; Donath, A.; Drury, L.O’C.; Dubus, G.; Dutson, K.; Dyks, J.; Dyrda, M.; Edwards, T.; Egberts, K.; Eger, P.; Ernenwein, J.-P.; Eschbach, S.; Farnier, C.; Fegan, S.; Fernandes, M.V.; Fiasson, A.; Fontaine, G.; Förster, A.; Funk, S.; Füßling, M.; Gabici, S.; Gajdus, M.; Gallant, Y.A.; Garrigoux, T.; Giavitto, G.; G...

A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations Thumbnail


Authors

H. Abdalla

A. Abramowski

F. Aharonian

F. Ait Benkhali

A.G. Akhperjanian

E.O. Angüner

M. Arrieta

P. Aubert

M. Backes

A. Balzer

M. Barnard

Y. Becherini

J. Becker Tjus

D. Berge

S. Bernhard

K. Bernlöhr

E. Birsin

R. Blackwell

M. Böttcher

C. Boisson

J. Bolmont

P. Bordas

J. Bregeon

F. Brun

P. Brun

M. Bryan

T. Bulik

M. Capasso

J. Carr

S. Casanova

N. Chakraborty

R. Chalme-Calvet

R.C.G. Chaves

A. Chen

J. Chevalier

M. Chrétien

S. Colafrancesco

G. Cologna

B. Condon

J. Conrad

C. Couturier

Y. Cui

I.D. Davids

B. Degrange

C. Deil

P. deWilt

H.J. Dickinson

A. Djannati-Ataï

W. Domainko

A. Donath

L.O’C. Drury

G. Dubus

K. Dutson

J. Dyks

M. Dyrda

T. Edwards

K. Egberts

P. Eger

J.-P. Ernenwein

S. Eschbach

C. Farnier

S. Fegan

M.V. Fernandes

A. Fiasson

G. Fontaine

A. Förster

S. Funk

M. Füßling

S. Gabici

M. Gajdus

Y.A. Gallant

T. Garrigoux

G. Giavitto

B. Giebels

J.F. Glicenstein

D. Gottschall

A. Goyal

M.-H. Grondin

M. Grudzińska

D. Hadasch

J. Hahn

J. Hawkes

G. Heinzelmann

G. Henri

G. Hermann

O. Hervet

A. Hillert

J.A. Hinton

W. Hofmann

C. Hoischen

M. Holler

D. Horns

A. Ivascenko

A. Jacholkowska

M. Jamrozy

M. Janiak

D. Jankowsky

F. Jankowsky

M. Jingo

T. Jogler

L. Jouvin

I. Jung-Richardt

M.A. Kastendieck

K. Katarzyński

U. Katz

D. Kerszberg

B. Khélifi

M. Kieffer

J. King

S. Klepser

D. Klochkov

W. Kluźniak

D. Kolitzus

Nu Komin

K. Kosack

S. Krakau

M. Kraus

F. Krayzel

P.P. Krüger

H. Laffon

G. Lamanna

J. Lau

J.-P. Lees

J. Lefaucheur

V. Lefranc

A. Lemière

M. Lemoine-Goumard

J.-P. Lenain

E. Leser

T. Lohse

M. Lorentz

R. Liu

I. Lypova

V. Marandon

A. Marcowith

C. Mariaud

R. Marx

G. Maurin

N. Maxted

M. Mayer

P.J. Meintjes

U. Menzler

M. Meyer

A.M.W. Mitchell

R. Moderski

M. Mohamed

K. Morå

E. Moulin

T. Murach

M. de Naurois

F. Niederwanger

J. Niemiec

L. Oakes

H. Odaka

S. Öttl

S. Ohm

M. Ostrowski

I. Oya

M. Padovani

M. Panter

R.D. Parsons

M. Paz Arribas

N.W. Pekeur

G. Pelletier

P.-O. Petrucci

B. Peyaud

S. Pita

H. Poon

D. Prokhorov

H. Prokoph

G. Pühlhofer

M. Punch

A. Quirrenbach

S. Raab

A. Reimer

O. Reimer

M. Renaud

R. de los Reyes

F. Rieger

C. Romoli

S. Rosier-Lees

G. Rowell

B. Rudak

C.B. Rulten

V. Sahakian

D. Salek

D.A. Sanchez

A. Santangelo

M. Sasaki

R. Schlickeiser

F. Schüssler

A. Schulz

U. Schwanke

S. Schwemmer

A.S. Seyffert

N. Shafi

I. Shilon

R. Simoni

H. Sol

F. Spanier

G. Spengler

F. Spies

Ł Stawarz

R. Steenkamp

C. Stegmann

F. Stinzing

K. Stycz

I. Sushch

J.-P. Tavernet

T. Tavernier

A.M. Taylor

R. Terrier

M. Tluczykont

C. Trichard

R. Tuffs

J. van der Walt

C. van Eldik

B. van Soelen

G. Vasileiadis

J. Veh

C. Venter

A. Viana

P. Vincent

J. Vink

F. Voisin

H.J. Völk

T. Vuillaume

Z. Wadiasingh

S.J. Wagner

P. Wagner

R.M. Wagner

R. White

A. Wierzcholska

P. Willmann

A. Wörnlein

D. Wouters

R. Yang

V. Zabalza

D. Zaborov

M. Zacharias

A.A. Zdziarski

A. Zech

F. Zefi

A. Ziegler

N. Żywucka



Abstract

Context. Microquasars are potential γ-ray emitters. Indications of transient episodes of γ-ray emission were recently reported in at least two systems: Cyg X-1 and Cyg X-3. The identification of additional γ-ray-emitting microquasars is required to better understand how γ-ray emission can be produced in these systems. Aim. Theoretical models have predicted very high-energy (VHE) γ-ray emission from microquasars during periods of transient outburst. Observations reported herein were undertaken with the objective of observing a broadband flaring event in the γ-ray and X-ray bands. Methods. Contemporaneous observations of three microquasars, GRS 1915+105, Circinus X-1, and V4641 Sgr, were obtained using the High Energy Spectroscopic System (H.E.S.S.) telescope array and the Rossi X-ray Timing Explorer (RXTE) satellite. X-ray analyses for each microquasar were performed and VHE γ-ray upper limits from contemporaneous H.E.S.S. observations were derived. Results. No significant γ-ray signal has been detected in any of the three systems. The integral γ-ray photon flux at the observational epochs is constrained to be I(>560 GeV) < 7.3 × 10−13 cm−2 s−1, I(>560 GeV ) < 1.2 × 10−12 cm−2 s−1, and I(>240 GeV) < 4.5 × 10−12 cm−2 s−1 for GRS 1915+105, Circinus X-1, and V4641 Sgr, respectively. Conclusions. The γ-ray upper limits obtained using H.E.S.S. are examined in the context of previous Cherenkov telescope observations of microquasars. The effect of intrinsic absorption is modelled for each target and found to have negligible impact on the flux of escaping γ-rays. When combined with the X-ray behaviour observed using RXTE, the derived results indicate that if detectable VHE γ-ray emission from microquasars is commonplace, then it is likely to be highly transient.

Citation

Abdalla, H., Abramowski, A., Aharonian, F., Benkhali, F. A., Akhperjanian, A., Angüner, E., …Żywucka, N. (2017). A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations. Astronomy & Astrophysics, 612, Article A10. https://doi.org/10.1051/0004-6361/201527773

Journal Article Type Article
Acceptance Date Feb 28, 2017
Online Publication Date Apr 9, 2017
Publication Date Apr 9, 2017
Deposit Date Apr 26, 2018
Publicly Available Date Apr 26, 2018
Journal Astronomy and astrophysics.
Print ISSN 0004-6361
Electronic ISSN 1432-0746
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 612
Article Number A10
DOI https://doi.org/10.1051/0004-6361/201527773
Public URL https://durham-repository.worktribe.com/output/1332737

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Copyright Statement
Reproduced with permission from Astronomy & Astrophysics, © ESO 2018





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