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Title:
Observation of TeV Gamma Rays from the Crab Nebula with Milagro Using a New Background Rejection Technique
Authors:
Atkins, R.; Benbow, W.; Berley, D.; Blaufuss, E.; Bussons, J.; Coyne, D. G.; Delay, R. S.; De Young, T.; Dingus, B. L.; Dorfan, D. E.; Ellsworth, R. W.; Falcone, A.; Fleysher, L.; Fleysher, R.; Gisler, G.; Gonzalez, M. M.; Goodman, J. A.; Haines, T. J.; Hays, E.; Hoffman, C. M.; Kelley, L. A.; Laird, R. W.; McCullough, J.; McEnery, J. E.; Miller, R. S.; Mincer, A. I.; Morales, M. F.; Nemethy, P.; Noyes, D.; Ryan, J. M.; Samuelson, F. W.; Schneider, M.; Shen, B.; Shoup, A.; Sinnis, G.; Smith, A. J.; Sullivan, G. W.; Tumer, O. T.; Wang, K.; Wascko, M.; Williams, D. A.; Westerhoff, S.; Wilson, M. E.; Xu, X.; Yodh, G. B.
Affiliation:
AA(University of Wisconsin, Madison, WI 53706.), AB(University of California, Santa Cruz, CA 95064.; Current address: Max Planck Institute, Heidelberg, Germany.), AC(University of Maryland, College Park, MD 20742.), AD(University of Maryland, College Park, MD 20742.), AE(University of Maryland, College Park, MD 20742.; Current address: Université de Montpellier II, Montpellier, France.), AF(University of California, Santa Cruz, CA 95064.), AG(University of California, Irvine, CA 92717.), AH(University of California, Santa Cruz, CA 95064.), AI(Los Alamos National Laboratory, Los Alamos, NM 87545.), AJ(University of California, Santa Cruz, CA 95064.), AK(George Mason University, Fairfax, VA 22030.), AL(University of New Hampshire, Durham, NH 03824-3525.; Current address: Purdue University, West Lafayette, IN 47907.), AM(New York University, New York, NY 10003.), AN(New York University, New York, NY 10003.), AO(Los Alamos National Laboratory, Los Alamos, NM 87545.), AP(University of Wisconsin, Madison, WI 53706.), AQ(University of Maryland, College Park, MD 20742.), AR(Los Alamos National Laboratory, Los Alamos, NM 87545.), AS(University of Maryland, College Park, MD 20742.), AT(Los Alamos National Laboratory, Los Alamos, NM 87545.), AU(University of California, Santa Cruz, CA 95064.), AV(University of Wisconsin, Madison, WI 53706.), AW(University of California, Santa Cruz, CA 95064.; Current address: Cabrillo College, Aptos, CA 95003.), AX(University of Wisconsin, Madison, WI 53706.; Current address: Goddard Space Flight Center, Greenbelt, MD 20771.), AY(University of New Hampshire, Durham, NH 03824-3525.), AZ(New York University, New York, NY 10003.), BA(University of California, Santa Cruz, CA 95064.; Current address: Massachusetts Institute of Technology, Cambridge, MA 02139.), BB(New York University, New York, NY 10003.), BC(University of Maryland, College Park, MD 20742.), BD(University of New Hampshire, Durham, NH 03824-3525.), BE(Los Alamos National Laboratory, Los Alamos, NM 87545.), BF(University of California, Santa Cruz, CA 95064.), BG(University of California, Riverside, CA 92521.), BH(University of California, Irvine, CA 92717.), BI(Los Alamos National Laboratory, Los Alamos, NM 87545.; Corresponding author (Los Alamos National Laboratory, MS 803, Los Alamos, NM 87545; ).), BJ(University of Maryland, College Park, MD 20742.), BK(University of Maryland, College Park, MD 20742.), BL(University of California, Riverside, CA 92521.), BM(University of California, Riverside, CA 92521.; Current address: Stanford Linear Accelerator Center, Menlo Park, CA 94025.), BN(University of California, Riverside, CA 92521.; Current address: Louisiana State University, Baton Rouge, LA 70803.), BO(University of California, Santa Cruz, CA 95064.), BP(University of California, Santa Cruz, CA 95064.; Current address: Columbia University, New York, NY 10027.), BQ(University of Wisconsin, Madison, WI 53706.), BR(Los Alamos National Laboratory, Los Alamos, NM 87545.), BS(University of California, Irvine, CA 92717.)
Publication:
The Astrophysical Journal, Volume 595, Issue 2, pp. 803-811. (ApJ Homepage)
Publication Date:
10/2003
Origin:
UCP
ApJ Keywords:
Gamma Rays: Observations, Instrumentation: Detectors, ISM: Individual: Name: Crab Nebula, Stars: Neutron, ISM: Supernova Remnants
DOI:
10.1086/377498
Bibliographic Code:
2003ApJ...595..803A

Abstract

The recent advances in TeV gamma-ray astronomy are largely the result of the ability to differentiate between extensive air showers generated by gamma rays and hadronic cosmic rays. Air Cerenkov telescopes have developed and perfected the ``imaging'' technique over the past several decades. However, until now no background rejection method has been successfully used in an air shower array to detect a source of TeV gamma rays. We report on a method to differentiate hadronic air showers from electromagnetic air showers in the Milagro gamma-ray observatory, based on the ability to detect the energetic particles in an extensive air shower. The technique is used to detect TeV emission from the Crab Nebula. The flux from the Crab Nebula is estimated to be 2.68(+/-0.42stat+/-1.4sys)×10-7(E/1TeV)-2.59 m-2 s-1 TeV-1, where the spectral index is assumed to be as given by the HEGRA collaboration.
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