FERMI LAT DISCOVERY OF EXTENDED GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W51C

FERMI LAT DISCOVERY OF EXTENDED GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W51C
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DOI：
10.1088/0004-637x/706/1/l1
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发表时间：
2009-10
期刊：
The Astrophysical Journal
影响因子：
--
通讯作者：
A. Abdo;M. Ackermann;M. Ajello;L. Baldini;J. Ballet;G. Barbiellini;M. Baring;D. Bastieri;B. Baughman;K. Bechtol;R. Bellazzini;B. Berenji;R. Blandford;E. Bloom;E. Bonamente;A. Borgland;A. Bouvier;J. Bregeon;A. Brez;M. Brigida;P. Bruel;T. Burnett;S. Buson;G. Caliandro;R. Cameron;P. Caraveo;J. Casandjian;C. Cecchi;O. Celik;A. Chekhtman;C. C. Cheung-C.;J. Chiang;S. Ciprini;R. Claus;J. Cohen-Tanugi;L. Cominsky;J. Conrad;S. Cutini;C. Dermer;A. Angelis;F. Palma;S. Digel;M. Dormody;E. Silva;P. Drell;R. Dubois;D. Dumora;C. Farnier;C. Favuzzi;S. Fegan;W. Focke;P. Fortin;M. Frailis;Y. Fukazawa;S. Funk;P. Fusco;F. Gargano;D. Gasparrini;N. Gehrels;S. Germani;G. Giavitto;B. Giebels;N. Giglietto;F. Giordano;T. Glanzman;G. Godfrey;I. Grenier;M. Grondin;J. Grove;L. Guillemot;S. Guiriec;Y. Hanabata;A. Harding;M. Hayashida;E. Hays;R. Hughes;M. Jackson;G. Jóhannesson;A. Johnson;T. Johnson;W. Johnson;T. Kamae;H. Katagiri;J. Kataoka;J. Katsuta;N. Kawai;M. Kerr;J. Knödlseder;M. Kocián;M. Kuss;J. Lande;L. Latronico;M. Lemoine-Goumard;F. Longo;F. Loparco;B. Lott;M. Lovellette;P. Lubrano;A. Makeev;M. Mazziotta;J. Mcenery;C. Meurer;P. Michelson;W. Mitthumsiri;T. Mizuno;A. Moiseev;C. Monte;M. Monzani;A. Morselli;I. Moskalenko;S. Murgia;T. Nakamori;P. Nolan;J. Norris;E. Nuss;T. Ohsugi;A. Okumura;N. Omodei;E. Orlando;J. Ormes;D. Paneque;D. Parent;V. Pelassa;M. Pepe;M. Pesce-Rollins;F. Piron;T. Porter;S. Rainò;R. Rando;M. Razzano;A. Reimer;O. Reimer;T. Reposeur;S. Ritz;A. Rodríguez;R. Romani;M. Roth;F. Ryde;H. Sadrozinski;D. Sanchez;A. Sander;P. Parkinson;J. Scargle;T. Schalk;C. Sgro’;E. Siskind;D. Smith;P. Smith;G. Spandre;P. Spinelli;M. Strickman;D. Suson;H. Tajima;H. Takahashi;Tadayuki Takahashi;Takaaki Tanaka;J. Thayer;J. Thayer;D. Thompson;L. Tibaldo;O. Tibolla;D. Torres;G. Tosti;A. Tramacere;Y. Uchiyama;T. Usher;V. Vasileiou;C. Venter;N. Vilchez;V. Vitale;A. Waite;Pengfei Wang;B. Winer;K. Wood;R. Yamazaki;T. Ylinen;M. Ziegler
A. Abdo;M. Ackermann;M. Ajello;L. Baldini;J. Ballet;G. Barbiellini;M. Baring;D. Bastieri;B. Baughman;K. Bechtol;R. Bellazzini;B. Berenji;R. Blandford;E. Bloom;E. Bonamente;A. Borgland;A. Bouvier;J. Bregeon;A. Brez;M. Brigida;P. Bruel;T. Burnett;S. Buson;G. Caliandro;R. Cameron;P. Caraveo;J. Casandjian;C. Cecchi;O. Celik;A. Chekhtman;C. C. Cheung-C.;J. Chiang;S. Ciprini;R. Claus;J. Cohen-Tanugi;L. Cominsky;J. Conrad;S. Cutini;C. Dermer;A. Angelis;F. Palma;S. Digel;M. Dormody;E. Silva;P. Drell;R. Dubois;D. Dumora;C. Farnier;C. Favuzzi;S. Fegan;W. Focke;P. Fortin;M. Frailis;Y. Fukazawa;S. Funk;P. Fusco;F. Gargano;D. Gasparrini;N. Gehrels;S. Germani;G. Giavitto;B. Giebels;N. Giglietto;F. Giordano;T. Glanzman;G. Godfrey;I. Grenier;M. Grondin;J. Grove;L. Guillemot;S. Guiriec;Y. Hanabata;A. Harding;M. Hayashida;E. Hays;R. Hughes;M. Jackson;G. Jóhannesson;A. Johnson;T. Johnson;W. Johnson;T. Kamae;H. Katagiri;J. Kataoka;J. Katsuta;N. Kawai;M. Kerr;J. Knödlseder;M. Kocián;M. Kuss;J. Lande;L. Latronico;M. Lemoine-Goumard;F. Longo;F. Loparco;B. Lott;M. Lovellette;P. Lubrano;A. Makeev;M. Mazziotta;J. Mcenery;C. Meurer;P. Michelson;W. Mitthumsiri;T. Mizuno;A. Moiseev;C. Monte;M. Monzani;A. Morselli;I. Moskalenko;S. Murgia;T. Nakamori;P. Nolan;J. Norris;E. Nuss;T. Ohsugi;A. Okumura;N. Omodei;E. Orlando;J. Ormes;D. Paneque;D. Parent;V. Pelassa;M. Pepe;M. Pesce-Rollins;F. Piron;T. Porter;S. Rainò;R. Rando;M. Razzano;A. Reimer;O. Reimer;T. Reposeur;S. Ritz;A. Rodríguez;R. Romani;M. Roth;F. Ryde;H. Sadrozinski;D. Sanchez;A. Sander;P. Parkinson;J. Scargle;T. Schalk;C. Sgro’;E. Siskind;D. Smith;P. Smith;G. Spandre;P. Spinelli;M. Strickman;D. Suson;H. Tajima;H. Takahashi;Tadayuki Takahashi;Takaaki Tanaka;J. Thayer;J. Thayer;D. Thompson;L. Tibaldo;O. Tibolla;D. Torres;G. Tosti;A. Tramacere;Y. Uchiyama;T. Usher;V. Vasileiou;C. Venter;N. Vilchez;V. Vitale;A. Waite;Pengfei Wang;B. Winer;K. Wood;R. Yamazaki;T. Ylinen;M. Ziegler
中科院分区：
其他
文献类型：
--
作者：
A. Abdo;M. Ackermann;M. Ajello;L. Baldini;J. Ballet;G. Barbiellini;M. Baring;D. Bastieri;B. Baughman;K. Bechtol;R. Bellazzini;B. Berenji;R. Blandford;E. Bloom;E. Bonamente;A. Borgland;A. Bouvier;J. Bregeon;A. Brez;M. Brigida;P. Bruel;T. Burnett;S. Buson;G. Caliandro;R. Cameron;P. Caraveo;J. Casandjian;C. Cecchi;O. Celik;A. Chekhtman;C. C. Cheung-C.;J. Chiang;S. Ciprini;R. Claus;J. Cohen-Tanugi;L. Cominsky;J. Conrad;S. Cutini;C. Dermer;A. Angelis;F. Palma;S. Digel;M. Dormody;E. Silva;P. Drell;R. Dubois;D. Dumora;C. Farnier;C. Favuzzi;S. Fegan;W. Focke;P. Fortin;M. Frailis;Y. Fukazawa;S. Funk;P. Fusco;F. Gargano;D. Gasparrini;N. Gehrels;S. Germani;G. Giavitto;B. Giebels;N. Giglietto;F. Giordano;T. Glanzman;G. Godfrey;I. Grenier;M. Grondin;J. Grove;L. Guillemot;S. Guiriec;Y. Hanabata;A. Harding;M. Hayashida;E. Hays;R. Hughes;M. Jackson;G. Jóhannesson;A. Johnson;T. Johnson;W. Johnson;T. Kamae;H. Katagiri;J. Kataoka;J. Katsuta;N. Kawai;M. Kerr;J. Knödlseder;M. Kocián;M. Kuss;J. Lande;L. Latronico;M. Lemoine-Goumard;F. Longo;F. Loparco;B. Lott;M. Lovellette;P. Lubrano;A. Makeev;M. Mazziotta;J. Mcenery;C. Meurer;P. Michelson;W. Mitthumsiri;T. Mizuno;A. Moiseev;C. Monte;M. Monzani;A. Morselli;I. Moskalenko;S. Murgia;T. Nakamori;P. Nolan;J. Norris;E. Nuss;T. Ohsugi;A. Okumura;N. Omodei;E. Orlando;J. Ormes;D. Paneque;D. Parent;V. Pelassa;M. Pepe;M. Pesce-Rollins;F. Piron;T. Porter;S. Rainò;R. Rando;M. Razzano;A. Reimer;O. Reimer;T. Reposeur;S. Ritz;A. Rodríguez;R. Romani;M. Roth;F. Ryde;H. Sadrozinski;D. Sanchez;A. Sander;P. Parkinson;J. Scargle;T. Schalk;C. Sgro’;E. Siskind;D. Smith;P. Smith;G. Spandre;P. Spinelli;M. Strickman;D. Suson;H. Tajima;H. Takahashi;Tadayuki Takahashi;Takaaki Tanaka;J. Thayer;J. Thayer;D. Thompson;L. Tibaldo;O. Tibolla;D. Torres;G. Tosti;A. Tramacere;Y. Uchiyama;T. Usher;V. Vasileiou;C. Venter;N. Vilchez;V. Vitale;A. Waite;Pengfei Wang;B. Winer;K. Wood;R. Yamazaki;T. Ylinen;M. Ziegler

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利用费米伽马射线空间望远镜上的大面积望远镜(LAT)发现了与超新星遗迹(SNR)W51C重合的明亮伽马射线发射。W51C是一颗中年残骸(∼104年)，在其外壳中有强烈的射电同步辐射，并已知与分子云相互作用。伽马射线发射在空间上是扩展的，与SNR W51C的射电和X射线范围大致一致。在0.2-50GeV能带内，能谱向高能方向陡化。在D&GT；5.5kpc的距离限制下，这颗天体的光度大于1×1036erg S−1，这使它成为我们银河系中最明亮的伽马射线源之一。观测到的伽马射线可以通过超新星冲击和激波-云相互作用的有效加速来合理解释。在强子碰撞中产生的中性π介子的衰变为伽马射线发射提供了一个合理的解释。加速质子的平均气体密度和总能量含量的乘积为。来自射电和X射线波段的电子密度限制使得很难将LAT信号解释为逆康普顿散射。与信噪比W51C一致的费米LAT源为银河系宇宙线的起源提供了新的线索。
The discovery of bright gamma-ray emission coincident with supernova remnant (SNR) W51C is reported using the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope. W51C is a middle-aged remnant (∼104 yr) with intense radio synchrotron emission in its shell and known to be interacting with a molecular cloud. The gamma-ray emission is spatially extended, broadly consistent with the radio and X-ray extent of SNR W51C. The energy spectrum in the 0.2–50 GeV band exhibits steepening toward high energies. The luminosity is greater than 1 × 1036 erg s−1 given the distance constraint of D > 5.5 kpc, which makes this object one of the most luminous gamma-ray sources in our Galaxy. The observed gamma-rays can be explained reasonably by a combination of efficient acceleration of nuclear cosmic rays at supernova shocks and shock–cloud interactions. The decay of neutral π mesons produced in hadronic collisions provides a plausible explanation for the gamma-ray emission. The product of the average gas density and the total energy content of the accelerated protons amounts to . Electron density constraints from the radio and X-ray bands render it difficult to explain the LAT signal as due to inverse Compton scattering. The Fermi LAT source coincident with SNR W51C sheds new light on the origin of Galactic cosmic rays.