FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1)

Abdo, A A; Ackermann, M; Ajello, M; Allafort, A; Bechtol, K; Berenji, B; Blandford, R D; Bloom, E D; Borgland, A W; Bouvier, A; Baldini, L; Bellazzini, R; Bregeon, J; Ballet, J; Barbiellini, G; Bastieri, D; Bonamente, E; Brandt, T J; Brigida, M; Bruel, P

doi:10.1088/0004-637X/718/1/348

Title: FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1)

Journal Article · Tue Jul 20 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/718/1/348· OSTI ID:21455141

Abdo, A A ^[1]; Ackermann, M; Ajello, M; Allafort, A; Bechtol, K; Berenji, B; Blandford, R D; Bloom, E D; Borgland, A W; Bouvier, A ^[2]; Baldini, L; Bellazzini, R; Bregeon, J ^[3]; Ballet, J ^[4]; Barbiellini, G ^[5]; Bastieri, D ^[6]; Bonamente, E ^[7]; Brandt, T J ^[8]; Brigida, M ^[9]; Bruel, P ^[10]

Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France)
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)
Centre d'Etude Spatiale des Rayonnements, CNRS/UPS, BP 44346, F-30128 Toulouse Cedex 4 (France)
Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy)
Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France)

We present detailed analysis of two gamma-ray sources, 1FGL J1801.3-2322c and 1FGL J1800.5-2359c, that have been found toward the supernova remnant (SNR) W28 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. 1FGL J1801.3-2322c is found to be an extended source within the boundary of SNR W28, and to extensively overlap with the TeV gamma-ray source HESS J1801-233, which is associated with a dense molecular cloud interacting with the SNR. The gamma-ray spectrum measured with the LAT from 0.2 to 100 GeV can be described by a broken power-law function with a break at {approx}1 GeV and photon indices of 2.09 {+-} 0.08 (stat) {+-} 0.28 (sys) below the break and 2.74 {+-} 0.06 (stat) {+-} 0.09 (sys) above the break. Given the clear association between HESS J1801-233 and the shocked molecular cloud and a smoothly connected spectrum in the GeV-TeV band, we consider the origin of the gamma-ray emission in both GeV and TeV ranges to be the interaction between particles accelerated in the SNR and the molecular cloud. The decay of neutral pions produced in interactions between accelerated hadrons and dense molecular gas provides a reasonable explanation for the broadband gamma-ray spectrum. 1FGL J1800.5-2359c, located outside the southern boundary of SNR W28, cannot be resolved. An upper limit on the size of the gamma-ray emission was estimated to be {approx}16' using events above {approx}2 GeV under the assumption of a circular shape with uniform surface brightness. It appears to coincide with the TeV source HESS J1800-240B, which is considered to be associated with a dense molecular cloud that contains the ultra compact H II region W28A2 (G5.89-0.39). We found no significant gamma-ray emission in the LAT energy band at the positions of TeV sources HESS J1800-230A and HESS J1800-230C. The LAT data for HESS J1800-230A combined with the TeV data points indicate a spectral break between 10 GeV and 100 GeV.

Cite

Export

Save

OSTI ID:: 21455141

Journal Information:: Astrophysical Journal, Vol. 718, Issue 1; Other Information: DOI: 10.1088/0004-637X/718/1/348; ISSN 0004-637X

Country of Publication:: United States

Language:: English

Cited By (43)

Supernova remnants: the X-ray perspective Vink, Jacco The Astronomy and Astrophysics Review, Vol. 20, Issue 1 https://doi.org/10.1007/s00159-011-0049-1	journal	December 2011
Observational Signatures of Particle Acceleration in Supernova Remnants Helder, E. A.; Vink, J.; Bykov, A. M. Space Science Reviews, Vol. 173, Issue 1-4 https://doi.org/10.1007/s11214-012-9919-8	journal	August 2012
The origin of galactic cosmic rays Hörandel, Jörg R. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 588, Issue 1-2 https://doi.org/10.1016/j.nima.2008.01.036	journal	April 2008
Probing the cold magnetised Universe with SPICA-POL (B-BOP) André, Ph.; Hughes, A.; Guillet, V. Publications of the Astronomical Society of Australia, Vol. 36 https://doi.org/10.1017/pasa.2019.20	journal	January 2019
Time-dependent escape of cosmic rays from supernova remnants, and their interaction with dense media Telezhinsky, I.; Dwarkadas, V. V.; Pohl, M. Astronomy & Astrophysics, Vol. 541 https://doi.org/10.1051/0004-6361/201118639	journal	May 2012
The supernova remnant W44: Confirmations and challenges for cosmic-ray acceleration Cardillo, M.; Tavani, M.; Giuliani, A. Astronomy & Astrophysics, Vol. 565 https://doi.org/10.1051/0004-6361/201322685	journal	May 2014
The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT Abdalla, H.; Abramowski, A.; Aharonian, F. Astronomy & Astrophysics, Vol. 612 https://doi.org/10.1051/0004-6361/201527843	journal	April 2018
Cosmic-ray propagation in the bi-stable interstellar medium: I. Conditions for cosmic-ray trapping Commerçon, Benoît; Marcowith, Alexandre; Dubois, Yohan Astronomy & Astrophysics, Vol. 622 https://doi.org/10.1051/0004-6361/201833809	journal	February 2019
Recombining Plasma in the Gamma-Ray-Emitting Mixed-Morphology Supernova Remnant 3c 391 Ergin, T.; Sezer, A.; Saha, L. The Astrophysical Journal, Vol. 790, Issue 1 https://doi.org/10.1088/0004-637x/790/1/65	journal	July 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 SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS Abdo, A. A.; Ajello, M.; Allafort, A. The Astrophysical Journal Supplement Series, Vol. 208, Issue 2 https://doi.org/10.1088/0067-0049/208/2/17	journal	September 2013
FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG Acero, F.; Ackermann, M.; Ajello, M. The Astrophysical Journal Supplement Series, Vol. 218, Issue 2 https://doi.org/10.1088/0067-0049/218/2/23	journal	June 2015
Anisotropic cosmic ray diffusion and gamma-ray production close to supernova remnants, with an application to W28 Nava, L.; Gabici, S. Monthly Notices of the Royal Astronomical Society, Vol. 429, Issue 2 https://doi.org/10.1093/mnras/sts450	journal	December 2012
Non-linear diffusion of cosmic rays escaping from supernova remnants – I. The effect of neutrals Nava, L.; Gabici, S.; Marcowith, A. Monthly Notices of the Royal Astronomical Society, Vol. 461, Issue 4 https://doi.org/10.1093/mnras/stw1592	journal	July 2016
Numerical simulations of supernova remnants in turbulent molecular clouds Zhang, Dong; Chevalier, Roger A. Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 2 https://doi.org/10.1093/mnras/sty2769	journal	October 2018
X-Ray Observations of the Supernova Remnant W 28 with Suzaku. I. Spectral Study of the Recombining Plasma Sawada, Makoto; Koyama, Katsuji Publications of the Astronomical Society of Japan, Vol. 64, Issue 4 https://doi.org/10.1093/pasj/64.4.81	journal	August 2012
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
On the nature of the TeV emission from the supernova remnant SN 1006: On the nature of the TeV emission from SNR Araya, Miguel; Frutos, Francisco Monthly Notices of the Royal Astronomical Society, Vol. 425, Issue 4 https://doi.org/10.1111/j.1365-2966.2012.21580.x	journal	September 2012
Fermi – LARGE AREA TELESCOPE: ACCOMPLISHMENTS AND CHALLENGES Kamae, Tuneyoshi Modern Physics Letters A, Vol. 28, Issue 02 https://doi.org/10.1142/s0217732313400026	journal	January 2013
Cosmic-ray acceleration and escape from post-adiabatic supernova remnants Brose, R.; Pohl, Martin; Sushch, I. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2020-01392	text	January 2020
Recombining Plasma and Gamma-Ray Emission in the Mixed-morphology Supernova Remnant 3C 400.2 Ergin, T.; Sezer, A.; Sano, H. The Astrophysical Journal, Vol. 842, Issue 1 https://doi.org/10.3847/1538-4357/aa72ee	journal	June 2017
2FHL J0826.1–4500: Discovery of a Possible Shock–Cloud Interaction on the Western Edge of the Vela Supernova Remnant Eagle, J.; Marchesi, S.; Castro, D. The Astrophysical Journal, Vol. 870, Issue 1 https://doi.org/10.3847/1538-4357/aaf0ff	journal	January 2019
Evolution of High-energy Particle Distribution in Supernova Remnants Zeng, Houdun; Xin, Yuliang; Liu, Siming The Astrophysical Journal, Vol. 874, Issue 1 https://doi.org/10.3847/1538-4357/aaf392	journal	March 2019
Discovery of Shocked Molecular Clouds Associated with the Shell-type Supernova Remnant RX J0046.5−7308 in the Small Magellanic Cloud Sano, H.; Matsumura, H.; Yamane, Y. The Astrophysical Journal, Vol. 881, Issue 1 https://doi.org/10.3847/1538-4357/ab2ade	journal	August 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
Observational Signatures of Particle Acceleration in Supernova Remnants Helder, E. A.; Vink, J.; Bykov, A. M. Particle Acceleration in Cosmic Plasmas https://doi.org/10.1007/978-1-4614-6455-6_12	book	January 2012
Fermi – LARGE AREA TELESCOPE: ACCOMPLISHMENTS AND CHALLENGES Kamae, Tuneyoshi Proceedings of the First LeCosPA Symposium, Towards Ultimate Understanding of the Universe https://doi.org/10.1142/9789814449373_0022	conference	February 2013
The origin of galactic cosmic rays Amato, Elena International Journal of Modern Physics D, Vol. 23, Issue 07 https://doi.org/10.1142/s0218271814300134	journal	June 2014
The Second Fermi Large area Telescope Catalog of Gamma-Ray Pulsars Abdo, A. A.; Ajello, M.; Allafort, A. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/desy-2014-00864	text	January 2013
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
The origin of galactic cosmic rays Blasi, Pasquale The Astronomy and Astrophysics Review, Vol. 21, Issue 1 https://doi.org/10.1007/s00159-013-0070-7	journal	November 2013
Cosmic-ray acceleration and escape from post-adiabatic supernova remnants Brose, R.; Pohl, M.; Sushch, I. Astronomy & Astrophysics, Vol. 634 https://doi.org/10.1051/0004-6361/201936567	journal	February 2020
Fermi Large Area Telescope Fourth Source Catalog Abdollahi, S. IOP https://doi.org/10.13016/m2hfkt-y90r	collection	January 2020
Supernova remnants: the X-ray perspective Vink, Jacco arXiv https://doi.org/10.48550/arxiv.1112.0576	text	January 2011
Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium Collaboration, Lat arXiv https://doi.org/10.48550/arxiv.1202.4039	text	January 2012
Observational signatures of particle acceleration in supernova remnants Helder, E. A.; Vink, J.; Bykov, A. M. arXiv https://doi.org/10.48550/arxiv.1206.1593	text	January 2012
Analytic Solution for Self-regulated Collective Escape of Cosmic Rays from their Acceleration Sites Malkov, M. A.; Diamond, P. H.; Sagdeev, R. Z. arXiv https://doi.org/10.48550/arxiv.1207.4728	text	January 2012
Recombining Plasma in the Gamma-ray Emitting Mixed-Morphology Supernova Remnant 3C 391 Ergin, Tülün; Sezer, Aytap; Saha, Lab arXiv https://doi.org/10.48550/arxiv.1406.2179	text	January 2014
Non-linear diffusion of cosmic rays escaping from supernova remnants - I. The effect of neutrals Nava, Lara; Gabici, Stefano; Marcowith, Alexandre arXiv https://doi.org/10.48550/arxiv.1606.06902	text	January 2016
The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT Collaboration, H. E. S. S.; Abdalla, H.; Abramowski, A. arXiv https://doi.org/10.48550/arxiv.1609.00600	text	January 2016
Evolution of high-energy particle distribution in Supernova Remnants Zeng, Houdun; Xin, Yuliang; Liu, Siming arXiv https://doi.org/10.48550/arxiv.1811.12644	text	January 2018
Probing the cold magnetized Universe with SPICA-POL (B-BOP) André, Ph.; Hughes, A.; Guillet, V. arXiv https://doi.org/10.48550/arxiv.1905.03520	text	January 2019
Cosmic-ray acceleration and escape from post-adiabatic Supernova remnants Brose, Robert; Pohl, Martin; Sushch, Iurii arXiv https://doi.org/10.48550/arxiv.1909.08484	text	January 2019

Similar Records

Fermi LAT Observations of the Supernova Remnant W28 (G6.4-0.1)

Journal Article · Wed Jun 30 00:00:00 EDT 2010 · The Astrophysical Journal · OSTI ID:21455141

Abdo, A. A.; Ackermann, M.; Ajello, M.; +151 more

Discovery of Very High Energy Gamma-Ray Emission in the W 28 (G6.4-0.1) Region and Multiwavelength Comparisons

Conference · Mon Oct 29 00:00:00 EDT 2007 · OSTI ID:21455141

Rowell, G; Brion, E; Reimer, O; +4 more

Detailed investigation of the gamma-ray emission in the vicinity of SNR W28 with Fermi-LAT

Journal Article · Fri Apr 25 00:00:00 EDT 2014 · The Astrophysical Journal · OSTI ID:21455141

Hanabata, Y.; Katagiri, H.; Hewitt, J. W.; +9 more

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMIC GAMMA SOURCES
COSMIC RADIATION
GAMMA RADIATION
GAMMA SPECTRA
GEV RANGE
PHOTON EMISSION
PIONS NEUTRAL
SUPERNOVA REMNANTS
TELESCOPES
TEV RANGE
BOSONS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EMISSION
ENERGY RANGE
HADRONS
IONIZING RADIATIONS
MESONS
PIONS
PSEUDOSCALAR MESONS
RADIATIONS
SPECTRA

Title: FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1)

Citation Formats

Cited By (43)

Similar Records

Related Subjects