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  Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory

HAWC Collaboration, Abeysekara, A. U., Albert, A., Alfaro, R., Alvarez, C., Álvarez, J. D., et al. (2017). Observation of the Crab Nebula with the HAWC Gamma-Ray Observatory. The Astrophysical Journal, 843(1): 39. doi:10.3847/1538-4357/aa7555.

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HAWC Collaboration, Author
Abeysekara, A. U., Author
Albert, A., Author
Alfaro, R., Author
Alvarez, C., Author
Álvarez, J. D., Author
Arceo, R., Author
Arteaga-Velázquez, J. C., Author
Solares, H. A. Ayala, Author
Barber, A. S., Author
Bautista-Elivar, N., Author
Becerril, A., Author
Belmont-Moreno, E., Author
BenZvi, S. Y., Author
Berley, D., Author
Braun, J., Author
Brisbois, C., Author
Caballero-Mora, K. S., Author
Capistrán, T., Author
Carramiñana, A., Author
Casanova, S.1, Author           Castillo, M., AuthorCotti, U., AuthorCotzomi, J., Authorde León, S. Coutiño, Authorde la Fuente, E., AuthorDe León, C., AuthorDeYoung, T., AuthorDingus, B. L., AuthorDuVernois, M. A., AuthorDíaz-Vélez, J. C., AuthorEllsworth, R. W., AuthorFiorino, D. W., AuthorFraija, N., AuthorGarcía-González, J. A., AuthorGerhardt, M., AuthorMunoz, A. González, AuthorGonzález, M. M., AuthorGoodman, J. A., AuthorHampel-Arias, Z., AuthorHarding, J. P., AuthorHernandez, S., AuthorHernandez-Almada, A., AuthorHinton, J.2, Author           Hui, C. M., AuthorHüntemeyer, P., AuthorIriarte, A., AuthorJardin-Blicq, A.2, Author           Joshi, V.2, Author           Kaufmann, S., AuthorKieda, D., AuthorLara, A., AuthorLauer, R. J., AuthorLee, W. H., AuthorLennarz, D., AuthorVargas, H. León, AuthorLinnemann, J. T., AuthorLonginotti, A. L., AuthorRaya, G. Luis, AuthorLuna-García, R., AuthorLópez-Coto, R-2, Author           Malone, K., AuthorMarinelli, S. S., AuthorMartinez, O., AuthorMartinez-Castellanos, I., AuthorMartínez-Castro, J., AuthorMartínez-Huerta, H., AuthorMatthews, J. A., AuthorMiranda-Romagnoli, P., AuthorMoreno, E., AuthorMostafá, M., AuthorNellen, L., AuthorNewbold, M., AuthorNisa, M. U., AuthorNoriega-Papaqui, R., AuthorPelayo, R., AuthorPretz, J., AuthorPérez-Pérez, E. G., AuthorRen, Z., AuthorRho, C. D., AuthorRivière, C., AuthorRosa-González, D., AuthorRosenberg, M., AuthorRuiz Velasco, E.2, Author           Salazar, H., AuthorGreus, F. Salesa, AuthorSandoval, A., AuthorSchneider, M., AuthorSchoorlemmer, H.2, Author           Sinnis, G., AuthorSmith, A. J., AuthorSpringer, R. W., AuthorSurajbali, P.2, Author           Taboada, I., AuthorTibolla, O., AuthorTollefson, K., AuthorTorres, I., AuthorUkwatta, T. N., AuthorVillaseñor, L., AuthorWeisgarber, T., AuthorWesterhoff, S., AuthorWisher, I. G., AuthorWood, J., AuthorYapici, T., AuthorYodh, G. B., AuthorYounk, P. W., AuthorZepeda, A., AuthorZhou, H., Author more..
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              
2Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society, ou_2074298              


Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 MPINP: HAWC - Abteilung Hinton
 Abstract: The Crab Nebula is the brightest TeV gamma-ray source in the sky and has been
used for the past 25 years as a reference source in TeV astronomy, for
calibration and verification of new TeV instruments. The High Altitude Water
Cherenkov Observatory (HAWC), completed in early 2015, has been used to observe
the Crab Nebula at high significance across nearly the full spectrum of
energies to which HAWC is sensitive. HAWC is unique for its wide field-of-view,
nearly 2 sr at any instant, and its high-energy reach, up to 100 TeV. HAWC's
sensitivity improves with the gamma-ray energy. Above $\sim$1 TeV the
sensitivity is driven by the best background rejection and angular resolution
ever achieved for a wide-field ground array.
We present a time-integrated analysis of the Crab using 507 live days of HAWC
data from 2014 November to 2016 June. The spectrum of the Crab is fit to a
function of the form $\phi(E) = \phi_0 (E/E_{0})^{-\alpha
-\beta\cdot{\rm{ln}}(E/E_{0})}$. The data is well-fit with values of
$\alpha=2.63\pm0.03$, $\beta=0.15\pm0.03$, and
log$_{10}(\phi_0~{\rm{cm}^2}~{\rm{s}}~{\rm{TeV}})=-12.60\pm0.02$ when $E_{0}$
is fixed at 7 TeV and the fit applies between 1 and 37 TeV. Study of the
systematic errors in this HAWC measurement is discussed and estimated to be
$\pm$50\% in the photon flux between 1 and 37 TeV.
Confirmation of the Crab flux serves to establish the HAWC instrument's
sensitivity for surveys of the sky. The HAWC survey will exceed sensitivity of
current-generation observatories and open a new view of 2/3 of the sky above 10


 Dates: 2017-06-29
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
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Title: The Astrophysical Journal
Source Genre: Journal
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 843 (1) Sequence Number: 39 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3