908 research outputs found
Active Noise Control with Sampled-Data Filtered-x Adaptive Algorithm
Analysis and design of filtered-x adaptive algorithms are conventionally done
by assuming that the transfer function in the secondary path is a discrete-time
system. However, in real systems such as active noise control, the secondary
path is a continuous-time system. Therefore, such a system should be analyzed
and designed as a hybrid system including discrete- and continuous- time
systems and AD/DA devices. In this article, we propose a hybrid design taking
account of continuous-time behavior of the secondary path via lifting
(continuous-time polyphase decomposition) technique in sampled-data control
theory
Enhanced Star Formation of Less Massive Galaxies in a Proto-Cluster at z=2.5
We investigate a correlation between star-formation rate (SFR) and stellar
mass for Halpha emission line galaxies (HAEs) in one of the richest
proto-clusters ever known at z~2.5, USS 1558-003 proto-cluster. This study is
based on a 9.7-hour narrow-band imaging data with MOIRCS on the Subaru
telescope. We are able to construct a sample, in combination with additional
H-band data taken with WFC3 on Hubble Space Telescope (HST), of 100 HAEs
reaching the dust-corrected SFRs down to 3 Msun/yr and the stellar masses down
to Msun. We find that while the star-forming galaxies with
> Msun are located on the universal SFR-mass main sequence
irrespective of the environment, less massive star-forming galaxies with
< Msun show a significant upward scatter from the main sequence in
this proto-cluster. This suggests that some less massive galaxies are in a
starburst phase, although we do not know yet if this is due to environmental
effects.Comment: 5 pages, 3 figures, 1 table, accepted for publication in the ApJ
Letter
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