Results 61 to 70 of about 787 (130)

Gravity Wave Variability in the Arctic Winter Mesosphere in Relation With the Stratospheric Polar Vortex

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 16, 28 August 2025.
Abstract In this study, we have investigated short‐period (< ${< } $1 hr) atmospheric gravity waves (AGWs) in the Arctic mesosphere‐lower thermosphere (MLT) region during January of 2014, 2015, and 2016. We used OH (3,1) band emission data from the Advanced Mesospheric Temperature Mapper (AMTM) at the Arctic Lidar Observatory for Middle Atmosphere ...
Subir Mandal, Tracy Moffat‐Griffin, Corwin J. Wright, Pierre‐Dominique Pautet, Mike J. Taylor, Takuji Nakamura   +5 more
wiley   +1 more source

Kinematic unrest of low mass galaxy groups [PDF]

, 2020
International audienceIn an effort to better understand the formation of galaxy groups, we examine the kinematics of a large sample of spectroscopically confirmed X-ray galaxy groups in the Cosmic Evolution Survey with a high sampling of galaxy group ...
Laigle, C., Y. Dubois, Kiiveri, K, Ahoranta, J, Devriendt, J., Devriendt, J, Khosroshahi, H. G., Gozaliasl, G, Finoguenov, A., Laigle, C, Dubois, Y, K. Kiiveri, Gozaliasl, G., Kirkpatrick, C.C., Kirkpatrick, CC, J. Devriendt, Ahoranta, J., J. Ahoranta, A. Finoguenov, Dubois, Y., Khosroshahi, HG, Finoguenov, A, C. C. Kirkpatrick, H. G. Khosroshahi, Khosroshahi, H.G., G. Gozaliasl, Kiiveri, K., C. Laigle, Kirkpatrick, C. C.   +28 more
core   +1 more source

Two Micron‐Size Dark Dimensions

Fortschritte der Physik, Volume 73, Issue 8, August 2025.
Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui, Ignatios Antoniadis, Dieter Lüst   +2 more
wiley   +1 more source

Optical polarimetry studies of Seyfert galaxies [PDF]

, 1999
Optical imaging polarimetry has been performed on seven nearby Seyfert galaxies, three with face-on and four with edge-on host galaxies of various morphological classifications.
Felton, Michelle Ann
core  

Kinematics and dynamics of molecular gas in high redshift quasars

, 2020
Molecular hydrogen (H2) is a fundamental component of galaxies, being the most abundant element in molecular clouds, where stars form, and an important source of radiative cooling at low temperature. With the advent of the ALMA telescope, we have started
Alessandro Lupi, Alessandro Lupi (8405211)   +1 more
core   +1 more source

From nearby to distant galaxies: kinematical and dynamical studies

, 2009
Kinematical studies of low and high redshift galaxies enables to probe galaxy formation and evolution scenarios. Integral field spectroscopy is a powerful tool to study with accuracy nearby galaxies kinematics. Recent observations also gives a new 2D vision of high redshift galaxies kinematics.
openaire   +2 more sources

The dynamics of molecular gas in nearby galaxies

, 2013
Includes abstract.
Frank, Bradley Stanton
core  

Spatially resolved spectroscopy of faint star-forming galaxies & their environments in the high redshift universe [PDF]

, 2011
This thesis is concerned with the spectroscopic observations of distant galaxies, 1 < z < 5. The galaxies presented here are intrinsically faint such that their ux is dominated by ordinary star formation rather than galaxy-galaxy merging and/or ...
Hurley, Mairéad
core  

Secondary evolution of galaxies investigated by N-body simulations

, 2008
In the ΛCDM cosmology, merging is one of the most important physical processes that drives the formation and evolution of galaxies. In the present work, we use N-body techniques to investigate some of currently open issues related to the formation and ...
Coppola, Giuseppina
core  

Shell galaxies: kinematical signature of shells, satellite galaxy disruption and dynamical friction

, 2013
Stellar shells observed in many giant elliptical and lenticular as well as a few spiral and dwarf galaxies presumably result from radial minor mergers of galaxies. We show that the line-of-sight velocity distribution of the shells has a quadruple-peaked shape.
openaire   +2 more sources