The first full orbit of η Carinae seen by Fermi

Reitberger, Klaus; Reimer, A.; Reimer, O.; Takahashi, H.

doi:10.1051/0004-6361/201525726

The first full orbit of η Carinae seen by Fermi

Journal Article · Fri May 08 00:00:00 EDT 2015 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/201525726· OSTI ID:1355158

Reitberger, Klaus ^[1]; Reimer, A. ^[2]; Reimer, O. ^[2]; Takahashi, H. ^[3]

Leopold-Franzens-Univ. Innsbruck, Innsbruck (Austria)
Leopold-Franzens-Univ. Innsbruck, Innsbruck (Austria); Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
Hiroshima Univ., Hiroshima (Japan)

The binary system η Carinae has completed its first 5.54 y orbit since the beginning of science operation of the Fermi Large Area Telescope (LAT). We are now able to investigate the high-energy γ-ray source at the position of η Carinae over its full orbital period. By this, we can address and confirm earlier predictions for temporal and spectral variability. Here, newer versions of the LAT datasets, instrument response functions and background models allow for a more accurate analysis. Therefore it is important to re-evaluate the previously analyzed time period along with the new data to further constrain location, spectral shape, and flux time history of the γ-ray source. As a result, we confirm earlier predictions of increasing flux values above 10 GeV toward the next periastron passage. For the most recent part of the data sample, flux values as high as those before the first periastron passage in 2008 are recorded. A comparison of spectral energy distributions around periastron and apastron passages reveals strong variation in the high-energy band. This is due to a second spectral component that is present only around periastron. In conclusion, improved spatial consistency with the γ-ray source at the position of η Carinae along with the confirmation of temporal variability above 10 GeV in conjunction with the orbital period strengthens the argument for unambiguous source identification. Spectral variability provides additional constraints for future modeling of the particle acceleration and γ-ray emission in colliding-wind binary systems.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1355158

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 577; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

References (19)

η Carinae: a very large hadron collider Farnier, C.; Walter, R.; Leyder, J. -C. Astronomy & Astrophysics, Vol. 526 https://doi.org/10.1051/0004-6361/201015590	journal	December 2010
High-energy radiation from the massive binary system Eta Carinae Bednarek, W.; Pabich, J. Astronomy & Astrophysics, Vol. 530 https://doi.org/10.1051/0004-6361/201116549	journal	May 2011
Gamma-ray follow-up studies on η Carinae Reitberger, K.; Reimer, O.; Reimer, A. Astronomy & Astrophysics, Vol. 544 https://doi.org/10.1051/0004-6361/201219249	journal	August 2012
Hard X-ray emission from η Carinae Leyder, J. -C.; Walter, R.; Rauw, G. Astronomy & Astrophysics, Vol. 477, Issue 3 https://doi.org/10.1051/0004-6361:20078981	journal	December 2007
Particle acceleration and nonthermal radio emission in binaries of early-type stars Eichler, D.; Usov, V. The Astrophysical Journal, Vol. 402 https://doi.org/10.1086/172130	journal	January 1993
The Likelihood Analysis of EGRET Data Mattox, J. R.; Bertsch, D. L.; Chiang, J. The Astrophysical Journal, Vol. 461 https://doi.org/10.1086/177068	journal	April 1996
X-Ray Monitoring of η Carinae: Variations on a Theme Corcoran, M. F. The Astronomical Journal, Vol. 129, Issue 4 https://doi.org/10.1086/428756	journal	April 2005
Detection of Gamma-Ray Emission from the Eta-Carinae Region Tavani, M.; Sabatini, S.; Pian, E. The Astrophysical Journal, Vol. 698, Issue 2 https://doi.org/10.1088/0004-637X/698/2/L142	journal	June 2009
Understanding the X-Ray Flaring from η Carinae Moffat, A. F. J.; Corcoran, M. F. The Astrophysical Journal, Vol. 707, Issue 1 https://doi.org/10.1088/0004-637X/707/1/693	journal	November 2009
FERMI LARGE AREA TELESCOPE OBSERVATION OF A GAMMA-RAY SOURCE AT THE POSITION OF ETA CARINAE Abdo, A. A.; Ackermann, M.; Ajello, M. The Astrophysical Journal, Vol. 723, Issue 1 https://doi.org/10.1088/0004-637X/723/1/649	journal	October 2010
High-Energy Particle Transport in Three-Dimensional Hydrodynamic Models of Colliding-Wind Binaries Reitberger, K.; Kissmann, R.; Reimer, A. The Astrophysical Journal, Vol. 782, Issue 2 https://doi.org/10.1088/0004-637X/782/2/96	journal	February 2014
Simulating Three-Dimensional Nonthermal High-Energy Photon Emission in Colliding-Wind Binaries Reitberger, K.; Kissmann, R.; Reimer, A. The Astrophysical Journal, Vol. 789, Issue 1 https://doi.org/10.1088/0004-637X/789/1/87	journal	June 2014
FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG Nolan, P. L.; Abdo, A. A.; Ackermann, M. The Astrophysical Journal Supplement Series, Vol. 199, Issue 2 https://doi.org/10.1088/0067-0049/199/2/31	journal	March 2012
THE FERMI LARGE AREA TELESCOPE ON ORBIT: EVENT CLASSIFICATION, INSTRUMENT RESPONSE FUNCTIONS, AND CALIBRATION Ackermann, M.; Ajello, M.; Albert, A. The Astrophysical Journal Supplement Series, Vol. 203, Issue 1 https://doi.org/10.1088/0067-0049/203/1/4	journal	October 2012
Particle Acceleration in the Expanding Blast wave of η Carina'S Great Eruption of 1843 Ohm, S.; Hinton, J. A.; Domainko, W. The Astrophysical Journal, Vol. 718, Issue 2 https://doi.org/10.1088/2041-8205/718/2/L161	journal	July 2010
Constraints on decreases in η Carinae's mass-loss from 3D hydrodynamic simulations of its binary colliding winds Madura, T. I.; Gull, T. R.; Okazaki, A. T. Monthly Notices of the Royal Astronomical Society, Vol. 436, Issue 4 https://doi.org/10.1093/mnras/stt1871	journal	October 2013
Super-Hard X-Ray Emission from η Carinae Observed with Suzaku Sekiguchi, Akiko; Tsujimoto, Masahiro; Kitamoto, Shunji Publications of the Astronomical Society of Japan, Vol. 61, Issue 4 https://doi.org/10.1093/pasj/61.4.629	journal	August 2009
Radio, X-ray, and γ-ray emission models of the colliding-wind binary WR 140 Pittard, J. M.; Dougherty, S. M. Monthly Notices of the Royal Astronomical Society, Vol. 372, Issue 2 https://doi.org/10.1111/j.1365-2966.2006.10888.x	journal	October 2006
HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae: HESS observations of the Carina nebula Abramowski, A.; Acero, F.; Aharonian, F. Monthly Notices of the Royal Astronomical Society, Vol. 424, Issue 1 https://doi.org/10.1111/j.1365-2966.2012.21180.x	journal	June 2012

Cited By (14)

Non-thermal X-rays from colliding wind shock acceleration in the massive binary Eta Carinae Hamaguchi, Kenji; Corcoran, Michael F.; Pittard, Julian M. Nature Astronomy, Vol. 2, Issue 9 https://doi.org/10.1038/s41550-018-0505-1	journal	July 2018
Embedded star clusters as sources of high-energy cosmic rays: Modelling and constraints Maurin, G.; Marcowith, A.; Komin, N. Astronomy & Astrophysics, Vol. 591 https://doi.org/10.1051/0004-6361/201628465	journal	June 2016
Extended VHE γ -ray emission towards SGR1806−20, LBV 1806−20, and stellar cluster Cl* 1806−20 Abdalla, H.; Abramowski, A.; Aharonian, F. Astronomy & Astrophysics, Vol. 612 https://doi.org/10.1051/0004-6361/201628695	journal	April 2018
Investigation of the WR 11 field at decimeter wavelengths Benaglia, P.; del Palacio, S.; Ishwara-Chandra, C. H. Astronomy & Astrophysics, Vol. 625 https://doi.org/10.1051/0004-6361/201834971	journal	May 2019
Colliding-wind binary systems: diffusive shock acceleration and non-thermal emission Pittard, J. M.; Vila, G. S.; Romero, G. E. Monthly Notices of the Royal Astronomical Society, Vol. 495, Issue 2 https://doi.org/10.1093/mnras/staa1099	journal	April 2020
Modelling the interaction between relativistic and non-relativistic winds in binary pulsar systems: strong magnetization of the pulsar wind Bogovalov, S. V.; Khangulyan, D.; Koldoba, A. Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 3 https://doi.org/10.1093/mnras/stz2815	journal	October 2019
Fermi Large Area Telescope Fourth Source Catalog Abdollahi, S. IOP https://doi.org/10.13016/m2hfkt-y90r	collection	January 2020
Extended VHE $\gamma$-Ray Emission Towards SGR1806-20, LBV1806-20, and Stellar Cluster Cl*1806-20 Abdalla, H.; Abramowski, A.; Aharonian, F. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2017-11577	text	January 2017
Fermi Large Area Telescope Fourth Source Catalog Abdollahi, S.; Acero, F.; Ackermann, Markus Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2020-01400	text	January 2020
Proton Acceleration in Colliding Stellar Wind Binaries Grimaldo, Emanuele; Reimer, Anita; Kissmann, Ralf The Astrophysical Journal, Vol. 871, Issue 1 https://doi.org/10.3847/1538-4357/aaf6ee	journal	January 2019
Fermi Large Area Telescope Fourth Source Catalog Abdollahi, S.; Acero, F.; Ackermann, M. The Astrophysical Journal Supplement Series, Vol. 247, Issue 1 https://doi.org/10.3847/1538-4365/ab6bcb	journal	March 2020
Investigation of the WR 11 field at decimeter wavelengths Benaglia, Paula; del Palacio, Santiago; H., Ishwara-Chandra C. arXiv https://doi.org/10.48550/arxiv.1903.10571	text	January 2019
Modelling the interaction between relativistic and non-relativistic winds in binary pulsar systems: strong magnetization of the pulsar wind Bogovalov, Sergey V.; Khangulyan, Dmitry; Koldoba, Alexander V. arXiv https://doi.org/10.48550/arxiv.1911.07441	text	January 2019
Colliding-wind binary systems: Diffusive shock acceleration and non-thermal emission Pittard, J. M.; Vila, G. S.; Romero, G. E. arXiv https://doi.org/10.48550/arxiv.1912.05299	text	January 2019