全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:Alison Klesman , Vicki Sarajedini
来源:[J].Revista Mexicana de Astronomía y Astrofísica : Universidad Nacional Autónoma de México. Instituto de Astronomía(IF 1.197), 2007, (29), pp.171DOAJ
摘要:We investigate the use of optical variabil- ity over 6 months to identify AGNs in the GOODS-South field. Photometry was per- formed on a sample of 24 infrared power law-selected AGN candidates and 104 X-ray sources with optical counterparts. We find that while the majority of var...
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (5)ProQuest
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (5)ProQuest
摘要:The soon-to-be-launched James Webb Space Telescope can study these halos in even more distant galaxies, which will tell astronomers how the escape fraction of Lyman-alpha photons changes over time. -
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (5)ProQuest
摘要:The measurement (H0 = 71.9±2.7 km/s/Mpc) is consistent with others obtained in the local universe using the Hubble Space Telescope (H0 = 73.24±1.74 km/s/Mpc).
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (5)ProQuest
摘要:The stars in the inner ring are older than those in the outer ring and likely represent an earlier epoch of star formation.
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (5)ProQuest
摘要:Not only has FRB 121102's behavior enabled researchers to track down its host galaxy, it has also confirmed that at least some FRBs can't be the result of a cataclysmic event, which would leave nothing behind to create repeated bursts.
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (6)ProQuest
摘要:UNIVERSAL RELATION A research team led by astronomers at Case Western Reserve University found that the distribution of normal matter in galaxies tightly correlates with their gravitational acceleration, which affects galaxy rotation.
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (6)ProQuest
摘要:Yet astronomers have recently uncovered a pulsar that's not a neutron star at all, but a white dwarf.
作者:Alison Klesman
来源:[J].Astronomy, 2017, Vol.45 (6)ProQuest
摘要:Gian Luca Israel of the Italian National Institute for Astrophysics and his colleagues used the X-ray Multi-Mirror Mission (XMMNewton) and Nuclear Spectroscopic Telescope Array (NuSTAR) space telescopes to explore the inner workings of ULX-1 in the edge-on spiral galaxy NGC 5907,...

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