Recent optical spectra of OQ 208 equals Mrk 668, a broad-line radio galaxy with a large redshift difference between its broad and narrow emission lines... DE Osterbrock - Recent Advances in Observational Astronomy 被引量: 0发表: 1981年 Detection of radio recombination lines in the Seyfert gal...
Indeed, it is demonstrated that, upon the compression, the emissions of both Au60S8r and Au60S8n obviously decrease, as shown in Fig. 5a, c. Of note, the maximum emission wavelength redshifts with the pressure increase, which also indicates that the interaction between the NCs was ...
In 2019, AWS used the data lakehouse term to describe its Amazon Redshift Spectrum service that allows users of its data warehouse service Amazon Redshift to search through data stored in Amazon S3. In 2020, the data lakehouse term came into widespread usage, with Databricks adopting it for ...
A few years later, Shen [19] put forward an approach to determine the geopotential via gravity frequency shift (GFS) in 1993. Therefore, the geopotential difference between two arbitrary points can be determined by comparing the clocks' running rates [17,20] or the frequencies [14,21,22]. ...
The redness is because they are so far away and because they appear in the redshift of the spectrum that they are moving away from us. Quasars are similar to pulsars (Pulsating Stars) in that they have streams of x-rays shooting from their middles. They don't rotate as often, if ...
is, but imagine a wheel that can morph to adapt to different terrain. That's exactly what researchers at the Korea Institute of Machinery and Materials (KIMM) have managed to develop: a wheel that can switch between solid and more fluid-like states in order to better tackle certain ...
Another interesting observation follows from the 1S–2S spectroscopy in hydrogen/anti-hydrogen concerning the gravitational redshift. The frequency shift Δ𝑓Δf in the gravitational potential difference Δ𝑈ΔU is given by Δ𝑓/𝑓=Δ𝑈/𝑐2Δf/f=ΔU/c2. Relative to the zero potential...
Figure 7. (a,b) The Allan deviation of the frequency comparison between the static Clock 1 and Clock 2, with Clock 2 being moved to low and high positions respectively. The red solid line shows the 1/𝜏−−√1/τ fit of the data. The green dashed line represents the theoretical ...
Spectroscopy is the analysis of the interaction between matter and any portion of the electromagnetic spectrum. Traditionally, spectroscopy involved thevisible spectrumof light, but X-ray, gamma, and UV spectroscopy also are valuable analytical techniques. Spectroscopy can involve any interaction between ...
accepted ApJin press – 2 – ABSTRACT There are irreducible differences between the Hubble constant measured locally and the global value. They are due to density perturbations and finite sample volume (cosmic variance) and finite number of objects in the sample (sampling variance). We qu...