74 research outputs found
Solution to the conflict between the resolved and unresolved galaxy stellar mass estimation from the perspective of JWST
By utilizing the spatially-resolved photometry of galaxies at in
the CEERS field, we estimate the resolved and unresolved stellar mass via
spectral energy distribution (SED) fitting to study the discrepancy between
them. We first compare derived from photometry with and without the
JWST wavelength coverage and find that can be overestimated by up to
0.2 dex when lacking rest-frame NIR data. The SED fitting process tends to
overestimate both stellar age and dust attenuation in the absence of rest-frame
NIR data, consequently leading to a larger observed mass-to-light ratio and
hence an elevated . With the inclusion of the JWST NIR photometry, we
find no significant disparity between the resolved and unresolved stellar mass
estimates, providing a plausible solution to the conflict between them out to
. Further investigation demonstrates that reliable
estimates can be obtained, regardless of whether they are derived from
spatially resolved or spatially unresolved photometry, so long as the reddest
filter included in the SED fitting has a rest-frame wavelength larger than
10000 \AA.Comment: 8 pages, 5 figures, accepted by Ap
Graph ODE with Factorized Prototypes for Modeling Complicated Interacting Dynamics
This paper studies the problem of modeling interacting dynamical systems,
which is critical for understanding physical dynamics and biological processes.
Recent research predominantly uses geometric graphs to represent these
interactions, which are then captured by powerful graph neural networks (GNNs).
However, predicting interacting dynamics in challenging scenarios such as
out-of-distribution shift and complicated underlying rules remains unsolved. In
this paper, we propose a new approach named Graph ODE with factorized
prototypes (GOAT) to address the problem. The core of GOAT is to incorporate
factorized prototypes from contextual knowledge into a continuous graph ODE
framework. Specifically, GOAT employs representation disentanglement and system
parameters to extract both object-level and system-level contexts from
historical trajectories, which allows us to explicitly model their independent
influence and thus enhances the generalization capability under system changes.
Then, we integrate these disentangled latent representations into a graph ODE
model, which determines a combination of various interacting prototypes for
enhanced model expressivity. The entire model is optimized using an end-to-end
variational inference framework to maximize the likelihood. Extensive
experiments in both in-distribution and out-of-distribution settings validate
the superiority of GOAT
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