FERMI LARGE AREA TELESCOPE STUDY OF COSMIC RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS

被引:48
作者
Ackermann, M. [1 ]
Ajello, M. [2 ,3 ]
Allafort, A. [2 ,3 ]
Baldini, L. [4 ]
Ballet, J. [5 ]
Barbiellini, G. [6 ,7 ]
Bastieri, D. [8 ,9 ]
Bechtol, K. [2 ,3 ]
Bellazzini, R. [4 ]
Berenji, B. [2 ,3 ]
Blandford, R. D. [2 ,3 ]
Bloom, E. D. [2 ,3 ]
Bonamente, E. [10 ,11 ]
Borgland, A. W. [2 ,3 ]
Bottacini, E. [2 ,3 ]
Brandt, T. J. [12 ,13 ]
Bregeon, J. [4 ]
Brigida, M. [14 ,15 ]
Bruel, P. [16 ]
Buehler, R. [2 ,3 ]
Busetto, G. [8 ,9 ]
Buson, S. [8 ,9 ]
Caliandro, G. A. [17 ]
Cameron, R. A. [2 ,3 ]
Caraveo, P. A. [18 ]
Casandjian, J. M. [5 ]
Cecchi, C. [10 ,11 ]
Charles, E. [2 ,3 ]
Chekhtman, A. [17 ]
Chiang, J. [2 ,3 ]
Ciprini, S. [11 ,20 ]
Claus, R. [2 ,3 ]
Cohen-Tanugi, J. [21 ]
Conrad, J. [22 ,23 ]
D'Ammando, F. [10 ,24 ,25 ]
de Angelis, A. [26 ,27 ]
de Palma, F. [14 ,15 ]
Dermer, C. D. [28 ]
Digel, S. W. [2 ,3 ]
do Couto e Silva, E. [2 ,3 ]
Drell, P. S. [2 ,3 ]
Drlica-Wagner, A. [2 ,3 ]
Falletti, L. [21 ]
Favuzzi, C. [14 ,15 ]
Fegan, S. J. [16 ]
Ferrara, E. C. [29 ]
Focke, W. B. [2 ,3 ]
Fukazawa, Y. [30 ]
Fukui, Y. [31 ]
Funk, S. [2 ,3 ]
机构
[1] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany
[2] Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA
[3] SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[4] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[5] CEA IRFU CNRS Univ Paris Diderot, Lab AIM, CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France
[6] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[7] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy
[8] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
[9] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy
[10] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
[11] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy
[12] CNRS, IRAP, F-31028 Toulouse 4, France
[13] Univ Toulouse, GAHEC, UPS OMP, IRAP, Toulouse, France
[14] Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy
[15] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
[16] Ecole Polytech, CNRS IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France
[17] Inst Ciencies Espai IEEE CSIC, Barcelona, Spain
[18] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy
[19] George Mason Univ, Ctr Earth Observing & Space Res, Coll Sci, Fairfax, VA 22030 USA
[20] Agenzia Spaziale Italiana ASI Sci Data Ctr, I-00044 Rome, Italy
[21] Univ Montpellier 2, Lab Univers & Particules Montpellier, CNRS IN2P3, Montpellier, France
[22] Stockholm Univ, Dept Phys, SE-10693 Stockholm, Sweden
[23] Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, SE-10693 Stockholm, Sweden
[24] IASF Palermo, I-90146 Palermo, Italy
[25] INAF Ist Astrofis Spaziale & Fis, I-00133 Rome, Italy
[26] Univ Udine, Dipartimento Fis, I-33100 Udine, Italy
[27] Ist Nazl Fis Nucl, Sez Trieste, Grp Coll Udine, I-33100 Udine, Italy
[28] USN, Div Space Sci, Res Lab, Washington, DC 20375 USA
[29] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[30] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan
[31] Nagoya Univ, Dept Phys & Astrophys, Nagoya, Aichi 4648602, Japan
[32] INAF Ist Radioastron, I-40129 Bologna, Italy
[33] Inst Univ France, F-75005 Paris, France
[34] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany
[35] Heidelberg Univ, D-69117 Heidelberg, Germany
[36] Univ Alabama, CSPAR, Huntsville, AL 35899 USA
[37] Univ Bordeaux 1, Ctr Etud Nucl Bordeaux Gradignan, IN2P3 CNRS, F-33175 Gradignan, France
[38] Ohio State Univ, Dept Phys, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[39] Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden
[40] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland
[41] Ibaraki Univ, Coll Sci, Mito, Ibaraki 3108512, Japan
[42] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan
[43] Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden
[44] Kyoto Univ, Yukawa Inst Theoret Phys, Sakyo Ku, Kyoto 6068502, Japan
[45] Univ Bordeaux 1, CNRS IN2p3, Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France
[46] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[47] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[48] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[49] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[50] CRESST, Greenbelt, MD 20771 USA
基金
美国国家航空航天局; 瑞典研究理事会;
关键词
cosmic rays; gamma rays: ISM; GAMMA-RAYS; CO SURVEY; EMISSION; GAS; EGRET; ORION;
D O I
10.1088/0004-637X/755/1/22
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report an analysis of the interstellar gamma-ray emission from the Chamaeleon, R Coronae Australis (R CrA), and Cepheus and Polaris flare regions with the Fermi Large Area Telescope. They are among the nearest molecular cloud complexes, within similar to 300 pc from the solar system. The gamma-ray emission produced by interactions of cosmic rays (CRs) and interstellar gas in those molecular clouds is useful to study the CR densities and distributions of molecular gas close to the solar system. The obtained gamma-ray emissivities above 250 MeV are (5.9 +/- 0.1(stat-1.0sys)(+0.9)) x 10(-27) photons s(-1) sr(-1) H-atom(-1), (10.2 +/- 0.4(stat-1.7sys)(+1.2)) x 10(-27) photons s(-1) sr(-1) H-atom(-1), and (9.1 +/- 0.3(stat-0.6sys)(+1.5)) x 10(-27) photons s(-1) sr(-1) H-atom(-1) for the Chamaeleon, R CrA, and Cepheus and Polaris flare regions, respectively. Whereas the energy dependences of the emissivities agree well with that predicted from direct CR observations at the Earth, the measured emissivities from 250 MeV to 10 GeV indicate a variation of the CR density by similar to 20% in the neighborhood of the solar system, even if we consider systematic uncertainties. The molecular mass calibrating ratio, X-CO = N(H-2)/W-CO, is found to be (0.96 +/- 0.06(stat-0.12sys)(+0.15)) x 10(20) H-2-molecule cm(-2) (K km s(-1))(-1), (0.99 +/- 0.08(stat-0.10sys)(+0.18)) x 10(20) H-2-molecule cm(-2) (K km s(-1))(-1), and (0.63 +/- 0.02(stat-0.07sys)(+0.09)) x 10(20) H-2-molecule cm(-2) (K km s(-1))(-1) for the Chamaeleon, R CrA, and Cepheus and Polaris flare regions, respectively, suggesting a variation of X-CO in the vicinity of the solar system. From the obtained values of X-CO, the masses of molecular gas traced by W-CO in the Chamaeleon, R CrA, and Cepheus and Polaris flare regions are estimated to be similar to 5 x 10(3)M(circle dot), similar to 10(3)M(circle dot), and similar to 3.3 x 10(4)M(circle dot), respectively. A comparable amount of gas not traced well by standard Hi and CO surveys is found in the regions investigated.
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