QSOs still problematical
نویسندگان
چکیده
منابع مشابه
Why is estimating climate sensitivity so problematical
Introduction Climate sensitivity estimates exhibit little consistency. As shown in the Introduction, Figure 1 of Box 12.2 of AR5 i (reproduced here as Figure 1) reveals that 5–95% uncertainty ranges estimated for equilibrium climate
متن کاملOpen discussion about a problematical eponym.
The ‘Clara cell’ was named after the anatomist Max Clara. This cell is localised in the terminal bronchioles of the human lung. It’s function in secretion and as a potential progenitor has recently been reviewed by Reynolds and Malkinson. Briefly, the morphology is typical and has already been described by Koelliker in 1881. It is a cuboidal, non-ciliated cell with a dome-like protrusion. It co...
متن کاملExtreme UV QSOs
We present a sample of spectroscopically confirmed QSOs with FUV-NUV color (as measured by GALEX photometry, FUV band: 1344-1786Å, NUV band: 1771 2831Å) bluer than canonical QSO templates and than the majority of known QSOs. We analyze their FUV to NIR colors, luminosities and optical spectra. The sample includes a group of 150 objects at low redshift (z < 0.5), and a group of 21 objects with r...
متن کاملA Phenomenological Model for QSOs
A combined model on the basis of generalized Field-Colgate and Terlevich-Melnick models are proposed for QSOs. Using LBQS data, it seems that the predictions of the model is confirmed by observations. The behavior of comoving density versus redshift is consistent with LDDE for QSQs. Considering the cosmic evolution of SFR, a unified aspect for origin and evolution of QSOs and ordinary galaxies ...
متن کاملQualitative Theory for Lensed QSOs
We show that some characteristics of multiply-imaged QSO systems are very modelindependent and can be deduced accurately by simply scrutinizing the relative positions of images and galaxy-lens center. These include the time-ordering of the images, the orientation of the lens potential, and the rough morphology of any ring. Other features can differ considerably between specific models; H0 is an...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1975
ISSN: 0028-0836,1476-4687
DOI: 10.1038/256540b0