Publication: MAGIC reveals a complex morphology within the unidentified gamma-ray source HESS J1857+026
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2014-11
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Fonseca González, Mª Victoria
Satalecka, Konstanzja
Scapin, Valeria
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Aims. HESS J1857+026 is an extended TeV gamma-ray source that was discovered by H. E. S. S. as part of its Galactic plane survey. Given its broadband spectral energy distribution and its spatial coincidence with the young energetic pulsar PSR J1856+0245, the source has been put forward as a pulsar wind nebula (PWN) candidate. MAGIC has performed follow-up observations aimed at mapping the source down to energies approaching 100 GeV in order to better understand its complex morphology. Methods. HESS J1857+026 was observed by MAGIC in 2010, yielding 29 h of good quality stereoscopic data that allowed us to map the source region in two separate ranges of energy. Results. We detected very-high-energy gamma-ray emission from HESS J1857+026 with a significance of 12 sigma above 150 GeV. The differential energy spectrum between 100 GeV and 13 TeV is described well by a power law function dN/dE = N-0(E/1TeV)(-Gamma) with N-0 = (5.37 +/- 0.44(stat) +/- 1.5(sys)) X 10(-12) (TeV-1 cm(-2) s(-1)) and Gamma = 2.16 +/- 0.07(stat) +/- 0.15(sys), which bridges the gap between the GeV emission measured by Fermi-LAT and the multi-TeV emission measured by H.E.S.S.. In addition, we present a detailed analysis of the energy-dependent morphology of this region. We couple these results with archival multiwavelength data and outline evidence in favor of a two-source scenario, whereby one source is associated with a PWN, while the other could be linked with a molecular cloud complex containing an HII region and a possible gas cavity.
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© ESO 2014. We would like to thank the Instituto de Astrofísica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German BMBF and MPG, the Italian INFN, the Swiss National Fund SNF, and the Spanish MICINN is gratefully acknowledged. This work was also supported by the CPAN CSD2007-00042 and MultiDark CSD2009-00064 projects of the Spanish Consolider-Ingenio 2010 programme, by grant 127740 of the Academy of Finland, by the DFG Cluster of Excellence “Origin and Structure of the Universe”, by the Croatian Science Foundation Project 09/176, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, and by the Polish MNiSzW grant 745/N-HESSMAGIC/2010/0.
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1) Abramowski, A., et al., (H.E.S.S. Collaboration) 2011, A&A, 528, 143.
2) Acero, F., et al., (Fermi-LAT Collaboration) 2013, ApJ, 773, 77.
3) Aharonian, F., et al., (H.E.S.S. Collaboration) 2008, A&A, 477, 353.
4) Albert, J., et al., (MAGIC Collaboration) 2007, Nucl. Instr. Meth. A, 583, 494.
5) Albert, J., Aliu, E., Anderhub, H., et al., 2008, Nucl. Instrum. Meth., A588, 424.
6) Aleksić, J., et al., (MAGIC Collaboration) 2012, Astropart. Phys., 35, 435.
7) Araudo, A.T., Romero, G.E., Bosch-Ramon, V., et al., 2008, IJMPD, 17, 1889.
8) Anderson, L.D., Bania, T.M., 2009, ApJ, 690, 706.
9) Anderson, L.D., Bania, T.M., Jackson, J.M., et al., 2009, ApJS, 181, 255.
10) Bania, T.M., Anderson, L.D., Balser, D.S., 2012, ApJ, 759, 96.
11) Beichman, C.A., Neugebauer, G., Habing, H.J., et al., 1988, IRAS Catalogs and Atlases, Vol.1: Explanatory Supplement (Pasadena: JPL).
12) Benjamin, R.A., Churchwell, E., Babler, B.L., et al., 2003, PASP, 115, 953.
13) Bock, D.C.-J., Gvaramadze, V.V. 2002, A&A, 394, 533.
14) Bosch-Ramon, V., Romero, G.E., Araudo, A.T., et al., 2010, A&A, 511, 8.
15) Brand, J., Blitz, L., 1993, A&A, 275, 67.
16) Bronfman, L., Nyman, L.-A., May, J., 1996, A&AS, 115, 81.
17) Carrigan, S., Brun, F., Chaves, R.C.G., et al., Proc. 33rd ICRC, 2013, (arXiv:1307.4690v2).
18) Clemens, D.P., 1985, ApJ, 295, 422.
19) Cordes, J.M., Lazio, T. J. W., 2002, preprint (arXiv:astro-ph/0207156).
20) de Jager, O.C., Djannati-Ataï A., 2008, preprint (arXiv:astro-ph/0803.0116).
21) Fukui, Y., Sano, H., Sato, J., et al., 2012, ApJ, 746, 82.
22) Gaensler, B.M., Slane, P.O., 2006, ARA&A, 44, 17.
23) Goldsmith, P. F., Li, D., 2005, ApJ, 622, 938.
24) Gooch, R.E., 1996, "Karma: a Visualisation Test-Bed", in ADASS V, ASP Conf. Series vol. 101, ed. G.H. Jacoby & J. Barnes, ASP.
25) Gibson S. J., 2010, "Cold Atomic Gas in the CGPS and Beyond", in Astronomical Society of the Pacific Conf. Series vol. 438, p 111, ed. R. Kothes, T. L. Landecker, & A. G. Willis, ASP.
26) Hessels, J.W., Nice D.J., Gaensler B.M., et al., 2008, ApJ, 682, L41.
27) Jackson, J.M., Bania, T.M., Simon, R., et al., 2002, ApJ, 163, 145.
28) Jackson, J.M., Rathborne, J.M., Shah, R.H., et al., 2006, ApJ Suppl., 163, 145.
29) Joye, W. A., Mandel, E., 2003, Astronomical Data Analysis Software and Systems XII ASP Conference Series, Vol. 295, p.489, ed. H. E. Payne, R. I. Jedrzejewski & R. N. Hook.
30) Kennel, C.F., Coroniti, F.V., 1984, Ap.J., 283, 694.
31) Klepser, S., Krause, J., Doro, M., et al., Proc. 32nd ICRC 2011, (arXiv:1109.6448v1).
32) Krause, J.D.G., 2013, Ludwig-Maximilians-Universität München, Ph.D. Thesis http://nbnresolving.de/urn:nbn:de:bvb:19-155655.
33) Kuchar, T. A., Bania, T. M., 1990, Ap.J., 352, 192.
34) Li, T.-P., Ma, Y.-Q., 1983, ApJ, 272, 317.
35) Lockman, F.J., 1989, ApJS, 71, 469.
36) Lombardi, S., Berger, K., Colin, P., et al., Proc. 32nd ICRC, 2011, (arXiv:1109.6195).
37) McClure-Griffiths, Dickey, J. M., 2007, ApJ, 671, 427.
38) Moralejo, A., Gaug, M., Carmona, E., et al., Proc. 31st ICRC, 2009, (arXiv:0907.0943).
39) Neronov, A., Semikoz, D., 2010, (arXiv:1011.0210v1).
40) Nice, D. J. , Altiere, E., Bogdanov, S., et al., 2013, ApJ, 772, 50.
41) Paneque, D., et al., 2011, Sources in the Fermi Sky Above 10 GeV, Rome.
42) Reimer, A., Pohl, M., Reimer, O. 2006, ApJ, 644, 1118
43) Roman-Duval, J., Jackson, J. M., Heyer, M., et al. 2009, ApJ, 699, 1153
44) Rousseau, R., Grondin, M.-H., Van Etten, A., et al., 2012, A&A, 544, A3.
45) Sault, R. J., Teuben, P. J., Wright, M. C. H., 1995, ASPC, 77, 433.
46) Stil, J.M., Taylor, A.R., Dickey, J.M., et al., 2006, AJ, 132, 1158.
47) Urquhart, J. S., Morgan, L. K., Figura, C. C., et al., 2011, MNRAS, 418, 1689.
48) Watson, C., Araya, E., Sewilo, M., et al., 2003, ApJ, 587, 714.