Results 71 to 80 of about 25,497 (219)
Evidence for Magnetically‐Driven Accretion in the Distal Solar System
AGU AdvancesPaleomagnetic measurements of meteorites indicate that magnetic fields existed in the inner solar nebula capable of driving accretion at rates similar to those observed for young stellar objects with protoplanetary disks.
Elias N. Mansbach +11 more
doaj +1 more source
Pulsar Wind Nebulae with Thick Toroidal Structure [PDF]
, 2011 We investigate a class of pulsar wind nebulae that show synchrotron emission from a thick toroidal structure. The best studied such object is the small radio and X-ray nebula around the Vela pulsar, which can be interpreted as the result of interaction of a mildly supersonic inward flow with the recent pulsar wind.
arxiv +1 more source
Bursts of the Crab Nebula gamma-ray emission at high and ultra-high energies
EPJ Web of Conferences, 2017 Characteristics of the flares of gamma rays detected from the Crab Nebula by the AGILE and Fermi-LAT satellite instruments are compared with those of a gamma ray burst recorded by several air shower arrays on February 23, 1989 and with one recent ...
Lidvansky A.S.
doaj +2 more sources
Analisis Teknik-Teknik Keamanan Pada Future Cloud Computing vs Current Cloud Computing: Survey Paper
Jurnal Teknologi dan Sistem Informasi, 2016 Cloud computing adalah salah satu dari teknologi jaringan yang sedang berkembang pesat saat ini, hal ini dikarenakan cloud computing memiliki kelebihan dapat meningkatkan fleksibilitas dan kapabilitas dari proses komputer secara dinamis tanpa perlu ...
Beny Nugraha
doaj +1 more source
Annual Review of Astronomy and Astrophysics, 1993 The progress in the search for proto-planetary nebulae (PPN) in the last 5 years is reviewed. An observational definition of PPN is developed and a list of current PPN candidates is given. The optical, infrared, and radio properties of PPN are summarized and compared with theoretical models.
openaire +3 more sources
Anticorrelation Between Flux and Photon Index of Hard-X-Ray Emission from the Crab
The Astrophysical JournalUsing Swift Burst Alert Telescope event-mode data during gamma-ray burst occurrences, we conduct spectral analysis for the Crab system. From 38 good observations, which span a period of 18 yr from 2006 to 2023, we find that the Crab’s X-ray flux not only
Koothodil Abhijith Augustine +1 more
doaj +1 more source
Kinematics of Molecular Hydrogen Emission from Planetary and Pre-planetary Nebulae [PDF]
arXiv, 2000 We report results from a program of high-resolution spectral mapping of rotational H_2 emission from bipolar planetary and pre-planetary nebulae. Long-slit spectra obtained with the NOAO Phoenix near-infrared spectrometer allow us to probe the molecular kinematics of these nebulae at moderate spatial resolution.
arxiv
Eta Carinae and Nebulae Around Massive Stars: Similarities to Planetary Nebulae? [PDF]
arXiv, 2008 I discuss some observational properties of aspherical nebulae around massive stars, and conclusions inferred for how they may have formed. Whether or not these ideas are applicable to the shaping of planetary nebulae is uncertain, but the observed similarities between some PNe and bipolar nebulae around massive stars is compelling. In the well-observed
arxiv
Intracluster Planetary Nebulae [PDF]
Symposium - International Astronomical Union, 2003 We review the progress of research on intracluster planetary nebulae (IPN). In the past five years, hundreds of IPN candidates have been detected in the Virgo and Fornax galaxy clusters and searches are also underway in poorer galaxy groups. From the observations to date, and applying the known properties of extragalactic planetary nebulae, the ...
openaire +6 more sources