Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303

H. Anderhub, L. A. Antonelli, P. Antoranz, M. Backes, C. Baixeras, S. Balestra, J. A. Barrio, D. Bastieri, J. Becerra González, J. K. Becker, W. Bednarek, K. Berger, E. Bernardini, A. Biland, O. Blanch Bigas, R. K. Bock, G. Bonnoli, P. Bordas, D. Borla Tridon, V. Bosch-Ramon & 135 others D. Bose, I. Braun, T. Bretz, D. Britzger, M. Camara, E. Carmona, A. Carosi, P. Colin, S. Commichau, J. L. Contreras, J. Cortina, M. T. Costado, S. Covino, F. Dazzi, A. De Angelis, E. De Cea Del Pozo, R. De Los Reyes, B. De Lotto, M. De Maria, F. De Sabata, C. Delgado Mendez, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, D. Elsaesser, M. Errando, D. Ferenc, E. Fernndez, R. Firpo, M. V. Fonseca, L. Font, N. Galante, R. J. García López, M. Garczarczyk, M. Gaug, N. Godinovic, F. Goebel, D. Hadasch, A. Herrero, D. Hildebrand, D. Höhne-Mönch, J. Hose, D. Hrupec, C. C. Hsu, T. Jogler, S. Klepser, D. Kranich, A. La Barbera, A. Laille, E. Leonardo, E. Lindfors, S. Lombardi, F. Longo, M. López, E. Lorenz, P. Majumdar, G. Maneva, N. Mankuzhiyil, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, D. Mazin, M. Meucci, J. M. Miranda, R. Mirzoyan, H. Miyamoto, J. Moldón, M. Moles, A. Moralejo, D. Nieto, K. Nilsson, J. Ninkovic, R. Orito, I. Oya, R. Paoletti, J. M. Paredes, M. Pasanen, D. Pascoli, F. Pauss, R. G. Pegna, M. A. Perez-Torres, M. Persic, L. Peruzzo, F. Prada, E. Prandini, N. Puchades, I. Puljak, I. Reichardt, W. Rhode, M. Ribó, J. Rico, M. Rissi, A. Robert, S. Rügamer, A. Saggion, T. Y. Saito, M. Salvati, M. Sánchez-Conde, K. Satalecka, V. Scalzotto, V. Scapin, T. Schweizer, M. Shayduk, S. N. Shore, N. Sidro, A. Sierpowska-Bartosik, A. Sillanpää, J. Sitarek, D. Sobczynska, F. Spanier, S. Spiro, A. Stamerra, L. S. Stark, T. Suric, L. Takalo, F. Tavecchio, P. Temnikov, D. Tescaro, M. Teshima, D. F. Torres, N. Turini, H. Vankov, R. M. Wagner, V. Zabalza, F. Zandanel, R. Zanin, J. Zapatero, Abraham David Falcone, L. Vetere, N. Gehrels, S. Trushkin, V. Dhawan, P. Reig

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The discovery of very high energy (VHE) gamma-ray emitting X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems, which provide variable conditions along eccentric orbits. Despite this, the nature of some of these systems, and of the accelerated particles producing the VHE emission, is unclear. To answer some of these open questions, we conducted a multiwavelength campaign of the VHE gamma-ray emitting X-ray binary LS I +61 303 including the MAGIC telescope, XMM-Newton, and Swift during 60% of an orbit in 2007 September. We detect a simultaneous outburst at X-ray and VHE bands, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the simultaneous X-ray/VHE pairs obtained during the outburst yields a correlation coefficient of r = 0.97, while a linear fit to all simultaneous pairs provides r = 0.81. Since a variable absorption of the VHE emission towards the observer is not expected for the data reported here, the correlation found indicates a simultaneity in the emission processes. Assuming that they are dominated by a single particle population, either hadronic or leptonic, the X-ray/VHE flux ratio favors leptonic models. This fact, together with the detected photon indices, suggests that in LS I +61 303 the X-rays are the result of synchrotron radiation of the same electrons that produce VHE emission as a result of inverse Compton scattering of stellar photons.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume706
Issue number1 PART 2
DOIs
StatePublished - Jan 1 2009

Fingerprint

gamma rays
energy
x rays
outburst
eccentric orbits
particle acceleration
photons
XMM-Newton telescope
energy flux
correlation coefficients
energy bands
synchrotron radiation
scattering
wavelength
orbits
electron
wavelengths
particle
electrons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Anderhub, H., Antonelli, L. A., Antoranz, P., Backes, M., Baixeras, C., Balestra, S., ... Reig, P. (2009). Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303. Astrophysical Journal, 706(1 PART 2). https://doi.org/10.1088/0004-637X/706/1/L27
Anderhub, H. ; Antonelli, L. A. ; Antoranz, P. ; Backes, M. ; Baixeras, C. ; Balestra, S. ; Barrio, J. A. ; Bastieri, D. ; González, J. Becerra ; Becker, J. K. ; Bednarek, W. ; Berger, K. ; Bernardini, E. ; Biland, A. ; Bigas, O. Blanch ; Bock, R. K. ; Bonnoli, G. ; Bordas, P. ; Tridon, D. Borla ; Bosch-Ramon, V. ; Bose, D. ; Braun, I. ; Bretz, T. ; Britzger, D. ; Camara, M. ; Carmona, E. ; Carosi, A. ; Colin, P. ; Commichau, S. ; Contreras, J. L. ; Cortina, J. ; Costado, M. T. ; Covino, S. ; Dazzi, F. ; De Angelis, A. ; De Cea Del Pozo, E. ; De Los Reyes, R. ; De Lotto, B. ; De Maria, M. ; De Sabata, F. ; Delgado Mendez, C. ; Domínguez, A. ; Dominis Prester, D. ; Dorner, D. ; Doro, M. ; Elsaesser, D. ; Errando, M. ; Ferenc, D. ; Fernndez, E. ; Firpo, R. ; Fonseca, M. V. ; Font, L. ; Galante, N. ; García López, R. J. ; Garczarczyk, M. ; Gaug, M. ; Godinovic, N. ; Goebel, F. ; Hadasch, D. ; Herrero, A. ; Hildebrand, D. ; Höhne-Mönch, D. ; Hose, J. ; Hrupec, D. ; Hsu, C. C. ; Jogler, T. ; Klepser, S. ; Kranich, D. ; La Barbera, A. ; Laille, A. ; Leonardo, E. ; Lindfors, E. ; Lombardi, S. ; Longo, F. ; López, M. ; Lorenz, E. ; Majumdar, P. ; Maneva, G. ; Mankuzhiyil, N. ; Mannheim, K. ; Maraschi, L. ; Mariotti, M. ; Martínez, M. ; Mazin, D. ; Meucci, M. ; Miranda, J. M. ; Mirzoyan, R. ; Miyamoto, H. ; Moldón, J. ; Moles, M. ; Moralejo, A. ; Nieto, D. ; Nilsson, K. ; Ninkovic, J. ; Orito, R. ; Oya, I. ; Paoletti, R. ; Paredes, J. M. ; Pasanen, M. ; Pascoli, D. ; Pauss, F. ; Pegna, R. G. ; Perez-Torres, M. A. ; Persic, M. ; Peruzzo, L. ; Prada, F. ; Prandini, E. ; Puchades, N. ; Puljak, I. ; Reichardt, I. ; Rhode, W. ; Ribó, M. ; Rico, J. ; Rissi, M. ; Robert, A. ; Rügamer, S. ; Saggion, A. ; Saito, T. Y. ; Salvati, M. ; Sánchez-Conde, M. ; Satalecka, K. ; Scalzotto, V. ; Scapin, V. ; Schweizer, T. ; Shayduk, M. ; Shore, S. N. ; Sidro, N. ; Sierpowska-Bartosik, A. ; Sillanpää, A. ; Sitarek, J. ; Sobczynska, D. ; Spanier, F. ; Spiro, S. ; Stamerra, A. ; Stark, L. S. ; Suric, T. ; Takalo, L. ; Tavecchio, F. ; Temnikov, P. ; Tescaro, D. ; Teshima, M. ; Torres, D. F. ; Turini, N. ; Vankov, H. ; Wagner, R. M. ; Zabalza, V. ; Zandanel, F. ; Zanin, R. ; Zapatero, J. ; Falcone, Abraham David ; Vetere, L. ; Gehrels, N. ; Trushkin, S. ; Dhawan, V. ; Reig, P. / Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303. In: Astrophysical Journal. 2009 ; Vol. 706, No. 1 PART 2.
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title = "Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303",
abstract = "The discovery of very high energy (VHE) gamma-ray emitting X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems, which provide variable conditions along eccentric orbits. Despite this, the nature of some of these systems, and of the accelerated particles producing the VHE emission, is unclear. To answer some of these open questions, we conducted a multiwavelength campaign of the VHE gamma-ray emitting X-ray binary LS I +61 303 including the MAGIC telescope, XMM-Newton, and Swift during 60{\%} of an orbit in 2007 September. We detect a simultaneous outburst at X-ray and VHE bands, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the simultaneous X-ray/VHE pairs obtained during the outburst yields a correlation coefficient of r = 0.97, while a linear fit to all simultaneous pairs provides r = 0.81. Since a variable absorption of the VHE emission towards the observer is not expected for the data reported here, the correlation found indicates a simultaneity in the emission processes. Assuming that they are dominated by a single particle population, either hadronic or leptonic, the X-ray/VHE flux ratio favors leptonic models. This fact, together with the detected photon indices, suggests that in LS I +61 303 the X-rays are the result of synchrotron radiation of the same electrons that produce VHE emission as a result of inverse Compton scattering of stellar photons.",
author = "H. Anderhub and Antonelli, {L. A.} and P. Antoranz and M. Backes and C. Baixeras and S. Balestra and Barrio, {J. A.} and D. Bastieri and Gonz{\'a}lez, {J. Becerra} and Becker, {J. K.} and W. Bednarek and K. Berger and E. Bernardini and A. Biland and Bigas, {O. Blanch} and Bock, {R. K.} and G. Bonnoli and P. Bordas and Tridon, {D. Borla} and V. Bosch-Ramon and D. Bose and I. Braun and T. Bretz and D. Britzger and M. Camara and E. Carmona and A. Carosi and P. Colin and S. Commichau and Contreras, {J. L.} and J. Cortina and Costado, {M. T.} and S. Covino and F. Dazzi and {De Angelis}, A. and {De Cea Del Pozo}, E. and {De Los Reyes}, R. and {De Lotto}, B. and {De Maria}, M. and {De Sabata}, F. and {Delgado Mendez}, C. and A. Dom{\'i}nguez and {Dominis Prester}, D. and D. Dorner and M. Doro and D. Elsaesser and M. Errando and D. Ferenc and E. Fernndez and R. Firpo and Fonseca, {M. V.} and L. Font and N. Galante and {Garc{\'i}a L{\'o}pez}, {R. J.} and M. Garczarczyk and M. Gaug and N. Godinovic and F. Goebel and D. Hadasch and A. Herrero and D. Hildebrand and D. H{\"o}hne-M{\"o}nch and J. Hose and D. Hrupec and Hsu, {C. C.} and T. Jogler and S. Klepser and D. Kranich and {La Barbera}, A. and A. Laille and E. Leonardo and E. Lindfors and S. Lombardi and F. Longo and M. L{\'o}pez and E. Lorenz and P. Majumdar and G. Maneva and N. Mankuzhiyil and K. Mannheim and L. Maraschi and M. Mariotti and M. Mart{\'i}nez and D. Mazin and M. Meucci and Miranda, {J. M.} and R. Mirzoyan and H. Miyamoto and J. Mold{\'o}n and M. Moles and A. Moralejo and D. Nieto and K. Nilsson and J. Ninkovic and R. Orito and I. Oya and R. Paoletti and Paredes, {J. M.} and M. Pasanen and D. Pascoli and F. Pauss and Pegna, {R. G.} and Perez-Torres, {M. A.} and M. Persic and L. Peruzzo and F. Prada and E. Prandini and N. Puchades and I. Puljak and I. Reichardt and W. Rhode and M. Rib{\'o} and J. Rico and M. Rissi and A. Robert and S. R{\"u}gamer and A. Saggion and Saito, {T. Y.} and M. Salvati and M. S{\'a}nchez-Conde and K. Satalecka and V. Scalzotto and V. Scapin and T. Schweizer and M. Shayduk and Shore, {S. N.} and N. Sidro and A. Sierpowska-Bartosik and A. Sillanp{\"a}{\"a} and J. Sitarek and D. Sobczynska and F. Spanier and S. Spiro and A. Stamerra and Stark, {L. S.} and T. Suric and L. Takalo and F. Tavecchio and P. Temnikov and D. Tescaro and M. Teshima and Torres, {D. F.} and N. Turini and H. Vankov and Wagner, {R. M.} and V. Zabalza and F. Zandanel and R. Zanin and J. Zapatero and Falcone, {Abraham David} and L. Vetere and N. Gehrels and S. Trushkin and V. Dhawan and P. Reig",
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language = "English (US)",
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journal = "Astrophysical Journal",
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Anderhub, H, Antonelli, LA, Antoranz, P, Backes, M, Baixeras, C, Balestra, S, Barrio, JA, Bastieri, D, González, JB, Becker, JK, Bednarek, W, Berger, K, Bernardini, E, Biland, A, Bigas, OB, Bock, RK, Bonnoli, G, Bordas, P, Tridon, DB, Bosch-Ramon, V, Bose, D, Braun, I, Bretz, T, Britzger, D, Camara, M, Carmona, E, Carosi, A, Colin, P, Commichau, S, Contreras, JL, Cortina, J, Costado, MT, Covino, S, Dazzi, F, De Angelis, A, De Cea Del Pozo, E, De Los Reyes, R, De Lotto, B, De Maria, M, De Sabata, F, Delgado Mendez, C, Domínguez, A, Dominis Prester, D, Dorner, D, Doro, M, Elsaesser, D, Errando, M, Ferenc, D, Fernndez, E, Firpo, R, Fonseca, MV, Font, L, Galante, N, García López, RJ, Garczarczyk, M, Gaug, M, Godinovic, N, Goebel, F, Hadasch, D, Herrero, A, Hildebrand, D, Höhne-Mönch, D, Hose, J, Hrupec, D, Hsu, CC, Jogler, T, Klepser, S, Kranich, D, La Barbera, A, Laille, A, Leonardo, E, Lindfors, E, Lombardi, S, Longo, F, López, M, Lorenz, E, Majumdar, P, Maneva, G, Mankuzhiyil, N, Mannheim, K, Maraschi, L, Mariotti, M, Martínez, M, Mazin, D, Meucci, M, Miranda, JM, Mirzoyan, R, Miyamoto, H, Moldón, J, Moles, M, Moralejo, A, Nieto, D, Nilsson, K, Ninkovic, J, Orito, R, Oya, I, Paoletti, R, Paredes, JM, Pasanen, M, Pascoli, D, Pauss, F, Pegna, RG, Perez-Torres, MA, Persic, M, Peruzzo, L, Prada, F, Prandini, E, Puchades, N, Puljak, I, Reichardt, I, Rhode, W, Ribó, M, Rico, J, Rissi, M, Robert, A, Rügamer, S, Saggion, A, Saito, TY, Salvati, M, Sánchez-Conde, M, Satalecka, K, Scalzotto, V, Scapin, V, Schweizer, T, Shayduk, M, Shore, SN, Sidro, N, Sierpowska-Bartosik, A, Sillanpää, A, Sitarek, J, Sobczynska, D, Spanier, F, Spiro, S, Stamerra, A, Stark, LS, Suric, T, Takalo, L, Tavecchio, F, Temnikov, P, Tescaro, D, Teshima, M, Torres, DF, Turini, N, Vankov, H, Wagner, RM, Zabalza, V, Zandanel, F, Zanin, R, Zapatero, J, Falcone, AD, Vetere, L, Gehrels, N, Trushkin, S, Dhawan, V & Reig, P 2009, 'Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303', Astrophysical Journal, vol. 706, no. 1 PART 2. https://doi.org/10.1088/0004-637X/706/1/L27

Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303. / Anderhub, H.; Antonelli, L. A.; Antoranz, P.; Backes, M.; Baixeras, C.; Balestra, S.; Barrio, J. A.; Bastieri, D.; González, J. Becerra; Becker, J. K.; Bednarek, W.; Berger, K.; Bernardini, E.; Biland, A.; Bigas, O. Blanch; Bock, R. K.; Bonnoli, G.; Bordas, P.; Tridon, D. Borla; Bosch-Ramon, V.; Bose, D.; Braun, I.; Bretz, T.; Britzger, D.; Camara, M.; Carmona, E.; Carosi, A.; Colin, P.; Commichau, S.; Contreras, J. L.; Cortina, J.; Costado, M. T.; Covino, S.; Dazzi, F.; De Angelis, A.; De Cea Del Pozo, E.; De Los Reyes, R.; De Lotto, B.; De Maria, M.; De Sabata, F.; Delgado Mendez, C.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Elsaesser, D.; Errando, M.; Ferenc, D.; Fernndez, E.; Firpo, R.; Fonseca, M. V.; Font, L.; Galante, N.; García López, R. J.; Garczarczyk, M.; Gaug, M.; Godinovic, N.; Goebel, F.; Hadasch, D.; Herrero, A.; Hildebrand, D.; Höhne-Mönch, D.; Hose, J.; Hrupec, D.; Hsu, C. C.; Jogler, T.; Klepser, S.; Kranich, D.; La Barbera, A.; Laille, A.; Leonardo, E.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Miyamoto, H.; Moldón, J.; Moles, M.; Moralejo, A.; Nieto, D.; Nilsson, K.; Ninkovic, J.; Orito, R.; Oya, I.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauss, F.; Pegna, R. G.; Perez-Torres, M. A.; Persic, M.; Peruzzo, L.; Prada, F.; Prandini, E.; Puchades, N.; Puljak, I.; Reichardt, I.; Rhode, W.; Ribó, M.; Rico, J.; Rissi, M.; Robert, A.; Rügamer, S.; Saggion, A.; Saito, T. Y.; Salvati, M.; Sánchez-Conde, M.; Satalecka, K.; Scalzotto, V.; Scapin, V.; Schweizer, T.; Shayduk, M.; Shore, S. N.; Sidro, N.; Sierpowska-Bartosik, A.; Sillanpää, A.; Sitarek, J.; Sobczynska, D.; Spanier, F.; Spiro, S.; Stamerra, A.; Stark, L. S.; Suric, T.; Takalo, L.; Tavecchio, F.; Temnikov, P.; Tescaro, D.; Teshima, M.; Torres, D. F.; Turini, N.; Vankov, H.; Wagner, R. M.; Zabalza, V.; Zandanel, F.; Zanin, R.; Zapatero, J.; Falcone, Abraham David; Vetere, L.; Gehrels, N.; Trushkin, S.; Dhawan, V.; Reig, P.

In: Astrophysical Journal, Vol. 706, No. 1 PART 2, 01.01.2009.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303

AU - Anderhub, H.

AU - Antonelli, L. A.

AU - Antoranz, P.

AU - Backes, M.

AU - Baixeras, C.

AU - Balestra, S.

AU - Barrio, J. A.

AU - Bastieri, D.

AU - González, J. Becerra

AU - Becker, J. K.

AU - Bednarek, W.

AU - Berger, K.

AU - Bernardini, E.

AU - Biland, A.

AU - Bigas, O. Blanch

AU - Bock, R. K.

AU - Bonnoli, G.

AU - Bordas, P.

AU - Tridon, D. Borla

AU - Bosch-Ramon, V.

AU - Bose, D.

AU - Braun, I.

AU - Bretz, T.

AU - Britzger, D.

AU - Camara, M.

AU - Carmona, E.

AU - Carosi, A.

AU - Colin, P.

AU - Commichau, S.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Costado, M. T.

AU - Covino, S.

AU - Dazzi, F.

AU - De Angelis, A.

AU - De Cea Del Pozo, E.

AU - De Los Reyes, R.

AU - De Lotto, B.

AU - De Maria, M.

AU - De Sabata, F.

AU - Delgado Mendez, C.

AU - Domínguez, A.

AU - Dominis Prester, D.

AU - Dorner, D.

AU - Doro, M.

AU - Elsaesser, D.

AU - Errando, M.

AU - Ferenc, D.

AU - Fernndez, E.

AU - Firpo, R.

AU - Fonseca, M. V.

AU - Font, L.

AU - Galante, N.

AU - García López, R. J.

AU - Garczarczyk, M.

AU - Gaug, M.

AU - Godinovic, N.

AU - Goebel, F.

AU - Hadasch, D.

AU - Herrero, A.

AU - Hildebrand, D.

AU - Höhne-Mönch, D.

AU - Hose, J.

AU - Hrupec, D.

AU - Hsu, C. C.

AU - Jogler, T.

AU - Klepser, S.

AU - Kranich, D.

AU - La Barbera, A.

AU - Laille, A.

AU - Leonardo, E.

AU - Lindfors, E.

AU - Lombardi, S.

AU - Longo, F.

AU - López, M.

AU - Lorenz, E.

AU - Majumdar, P.

AU - Maneva, G.

AU - Mankuzhiyil, N.

AU - Mannheim, K.

AU - Maraschi, L.

AU - Mariotti, M.

AU - Martínez, M.

AU - Mazin, D.

AU - Meucci, M.

AU - Miranda, J. M.

AU - Mirzoyan, R.

AU - Miyamoto, H.

AU - Moldón, J.

AU - Moles, M.

AU - Moralejo, A.

AU - Nieto, D.

AU - Nilsson, K.

AU - Ninkovic, J.

AU - Orito, R.

AU - Oya, I.

AU - Paoletti, R.

AU - Paredes, J. M.

AU - Pasanen, M.

AU - Pascoli, D.

AU - Pauss, F.

AU - Pegna, R. G.

AU - Perez-Torres, M. A.

AU - Persic, M.

AU - Peruzzo, L.

AU - Prada, F.

AU - Prandini, E.

AU - Puchades, N.

AU - Puljak, I.

AU - Reichardt, I.

AU - Rhode, W.

AU - Ribó, M.

AU - Rico, J.

AU - Rissi, M.

AU - Robert, A.

AU - Rügamer, S.

AU - Saggion, A.

AU - Saito, T. Y.

AU - Salvati, M.

AU - Sánchez-Conde, M.

AU - Satalecka, K.

AU - Scalzotto, V.

AU - Scapin, V.

AU - Schweizer, T.

AU - Shayduk, M.

AU - Shore, S. N.

AU - Sidro, N.

AU - Sierpowska-Bartosik, A.

AU - Sillanpää, A.

AU - Sitarek, J.

AU - Sobczynska, D.

AU - Spanier, F.

AU - Spiro, S.

AU - Stamerra, A.

AU - Stark, L. S.

AU - Suric, T.

AU - Takalo, L.

AU - Tavecchio, F.

AU - Temnikov, P.

AU - Tescaro, D.

AU - Teshima, M.

AU - Torres, D. F.

AU - Turini, N.

AU - Vankov, H.

AU - Wagner, R. M.

AU - Zabalza, V.

AU - Zandanel, F.

AU - Zanin, R.

AU - Zapatero, J.

AU - Falcone, Abraham David

AU - Vetere, L.

AU - Gehrels, N.

AU - Trushkin, S.

AU - Dhawan, V.

AU - Reig, P.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - The discovery of very high energy (VHE) gamma-ray emitting X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems, which provide variable conditions along eccentric orbits. Despite this, the nature of some of these systems, and of the accelerated particles producing the VHE emission, is unclear. To answer some of these open questions, we conducted a multiwavelength campaign of the VHE gamma-ray emitting X-ray binary LS I +61 303 including the MAGIC telescope, XMM-Newton, and Swift during 60% of an orbit in 2007 September. We detect a simultaneous outburst at X-ray and VHE bands, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the simultaneous X-ray/VHE pairs obtained during the outburst yields a correlation coefficient of r = 0.97, while a linear fit to all simultaneous pairs provides r = 0.81. Since a variable absorption of the VHE emission towards the observer is not expected for the data reported here, the correlation found indicates a simultaneity in the emission processes. Assuming that they are dominated by a single particle population, either hadronic or leptonic, the X-ray/VHE flux ratio favors leptonic models. This fact, together with the detected photon indices, suggests that in LS I +61 303 the X-rays are the result of synchrotron radiation of the same electrons that produce VHE emission as a result of inverse Compton scattering of stellar photons.

AB - The discovery of very high energy (VHE) gamma-ray emitting X-ray binaries has triggered an intense effort to better understand the particle acceleration, absorption, and emission mechanisms in compact binary systems, which provide variable conditions along eccentric orbits. Despite this, the nature of some of these systems, and of the accelerated particles producing the VHE emission, is unclear. To answer some of these open questions, we conducted a multiwavelength campaign of the VHE gamma-ray emitting X-ray binary LS I +61 303 including the MAGIC telescope, XMM-Newton, and Swift during 60% of an orbit in 2007 September. We detect a simultaneous outburst at X-ray and VHE bands, with the peak at phase 0.62 and a similar shape at both wavelengths. A linear fit to the simultaneous X-ray/VHE pairs obtained during the outburst yields a correlation coefficient of r = 0.97, while a linear fit to all simultaneous pairs provides r = 0.81. Since a variable absorption of the VHE emission towards the observer is not expected for the data reported here, the correlation found indicates a simultaneity in the emission processes. Assuming that they are dominated by a single particle population, either hadronic or leptonic, the X-ray/VHE flux ratio favors leptonic models. This fact, together with the detected photon indices, suggests that in LS I +61 303 the X-rays are the result of synchrotron radiation of the same electrons that produce VHE emission as a result of inverse Compton scattering of stellar photons.

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U2 - 10.1088/0004-637X/706/1/L27

DO - 10.1088/0004-637X/706/1/L27

M3 - Article

VL - 706

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART 2

ER -

Anderhub H, Antonelli LA, Antoranz P, Backes M, Baixeras C, Balestra S et al. Correlated X-ray and very high energy emission in the gamma-ray binary LS i +61 303. Astrophysical Journal. 2009 Jan 1;706(1 PART 2). https://doi.org/10.1088/0004-637X/706/1/L27