Meson Synchrotron Emission from Central Engines of Gamma-Ray Bursts with Strong Magnetic Fields [0.03%]
强磁场γ射线暴中心引擎的介子同步辐射
A Tokuhisa,T Kajino
A Tokuhisa
Gamma-ray bursts (GRBs) are presumed to be powered by the still unknown central engines with timescales in the range from 1 ms to approximately a few seconds. We propose that the GRB central engines would be a viable site for strong meson s...
M Jura,MW Werner
M Jura
We have used the Keck I telescope to resolve at three mid-IR wavelengths the emission from HD 179821 (= RAFGL 2343), a G-type supergiant of perhaps 30 M middle dot in circle with a detached dust shell. The shell is very approximately circul...
Detection of Polarized CO Emission from the Molecular Outflow in NGC 1333 IRAS 4A [0.03%]
探测NGC1333 IRS4A分子流出物中极化CO发射线
JM Girart,RM Crutcher,R Rao
JM Girart
We report the first interferometric detection and mapping of linearly polarized spectral line emission due to the Goldreich-Kylafis effect. Our polarization maps of the CO J=2-->1 line in the molecular outflow powered by the very young stel...
T Umemoto,H Mikami,S Yamamoto et al.
T Umemoto et al.
We have measured the ortho-to-para ratio of ammonia in the blueshifted gas of the L1157 outflow by observing the six metastable inversion lines from &parl0;J,K&parr0;=&parl0;1,1&parr0; to (6, 6). The highly excited (5, 5) and (6, 6) lines w...
M Wardle
M Wardle
Cosmic-ray and X-ray ionizations in molecular gas produce a weak far-ultraviolet flux through the radiative decay of H2 molecules that have been excited by collisions with energetic electrons (the Prasad-Tarafdar mechanism). I consider the ...
JD Monnier,PG Tuthill,WC Danchi
JD Monnier
We present the first near-infrared images of the dusty Wolf-Rayet star WR 98a. Aperture-masking interferometry has been utilized to recover images at the diffraction limit of the Keck I telescope, less, similar50 mas at 2.2 µm. Multiepoch ...
Observation of Multi-TeV Gamma Rays from the Crab Nebula using the Tibet Air Shower Array [0.03%]
使用西藏空气 shower阵列观测蟹状星云的TeV γ射线
M Amenomori,S Ayabe,PY Cao et al.
M Amenomori et al.
The Tibet experiment, operating at Yangbajing (4300 m above sea level), is the lowest energy air shower array, and the new high-density array constructed in 1996 is sensitive to gamma-ray air showers at energies as low as 3 TeV. With this n...
Possible Evidence for Truncated Thin Disks in the Low-Luminosity Active Galactic Nuclei M81 and NGC 4579 [0.03%]
极低光度活动星系核M81和NGC4579中可能存在薄盘截断的迹象
E Quataert,Di Matteo T,R Narayan et al.
E Quataert et al.
M81 and NGC 4579 are two of the few low-luminosity active galactic nuclei that have an estimated mass for the central black hole, detected hard X-ray emission, and detected optical/UV emission. In contrast to the canonical "big blue bump," ...
BT Soifer,K Matthews,JR Kiger et al.
BT Soifer et al.
Near-infrared spectra with a resolution of lambda&solm0;Deltalambda approximately 1100 in the rest-wavelength range of 1.8-2.2 µm have been obtained for a complete sample of 33 ultraluminous infrared galaxies (ULIRGs). Of the 33 objects ob...
The Radio Afterglow and the Host Galaxy of the X-Ray-rich GRB 981226 [0.03%]
富X射线的伽玛暴GRB 981226的射电余辉及其宿主星系
DA Frail,SR Kulkarni,JS Bloom et al.
DA Frail et al.
We report the discovery of a radio transient VLA 232937.2-235553, coincident with the proposed X-ray afterglow for the gamma-ray burst GRB 981226. This gamma-ray burst (GRB) has the highest ratio of X-ray to gamma-ray fluence of all the GRB...