Results 31 to 40 of about 221,035 (206)

Unveiling a Young Thick Disk in the Milky Way

The Astrophysical Journal Letters
The thickness of a galaxy’s disk provides a valuable probe of its formation and evolution history. Observations of the Milky Way and local galaxies have revealed an ubiquitous disk structure with two distinctive components: an old thick disk and a ...
Jianhui Lian, Min Du, Shuai Lu, Bingqiu Chen, Gail Zasowski, Zhaoyu Li, Xiaojie Liao, Chao Liu   +7 more
doaj   +1 more source

Observation of Disk Scattering Slab Modes Transitioning to Disk Scattering Modes on Metal–Dielectric Heterostructures in the Terahertz Waveband

IEEE Photonics Journal, 2015
It has been demonstrated that, in the terahertz (THz) waveband, disk scattering slab modes (DSSMs) can exist in a heterostructure composed of a metallic subwavelength disk array coated on one surface of a dielectric slab.
Wei Wang, Jinsong Liu, Kejia Wang, Zhengang Yang, Kefei Ye   +4 more
doaj   +1 more source

Structural Parameters of Thin and Thick Disks in Edge-On Disk Galaxies

, 2005
We analyze the global structure of 34 late-type, edge-on, undisturbed, disk galaxies spanning a wide range of mass. We measure structural parameters for the galaxies using two-dimensional least-squares fitting to our $R$-band photometry. The fits require
Binggeli B., Buser R., de Grijs R., de Grijs R., Fuhrmann K., Gilmore G., Julianne J. Dalcanton, Karachentsev I. D., Karachentsev I. D., Kudrya Y. N., Pagel B. E. J., Peter Yoachim, Pohlen M., Robin A. C., Shaw M. A., Staveley-Smith L., van der Kruit P. C., van der Kruit P. C., van der Kruit P. C., van der Kruit P. C., van Dokkum P. G.   +20 more
core   +1 more source

Subsystems of the Galactic halo, their structures and compositions

Odessa Astronomical Publications, 2017
It is shown that general populations of globular clusters and metal-poor field stars are components at least of three subsystems occupying different volumes in the Galaxy.
V. A. Marsakov, T. V. Borkova
doaj   +1 more source

The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs

, 2017
We present a detailed analysis of the white dwarf luminosity functions derived from the local 40 pc sample and the deep proper motion catalog of Munn et al (2014, 2017).
DeGennaro, Steven, Harris, Hugh C., Jeffery, Elizabeth, Kilic, Mukremin, Liebert, James W., Munn, Jeffrey A., von Hippel, Ted, Williams, Kurtis A.   +7 more
core   +1 more source

The Thickness of Galaxy Disks from z = 5 to 0 Probed by JWST

The Astrophysical Journal Letters
Although a thick disk is a structure prevalent in local disk galaxies and also present in our home Galaxy, its formation and evolution are still unclear.
Jianhui Lian, Li Luo
doaj   +1 more source

Graphene overcoats for ultra-high storage density magnetic media

Nature Communications, 2021
The main limitation to the areal storage density of hard disk drives (HDDs) is the thickness of carbon overcoats protecting the disk media. Here,
N. Dwivedi, A. K. Ott, K. Sasikumar, C. Dou, R. J. Yeo, B. Narayanan, U. Sassi, D. De Fazio, G. Soavi, T. Dutta, O. Balci, S. Shinde, J. Zhang, A. K. Katiyar, P. S. Keatley, A. K. Srivastava, S. K. R. S. Sankaranarayanan, A. C. Ferrari, C. S. Bhatia   +18 more
doaj   +1 more source

On the Significance of the Thick Disks of Disk Galaxies

The Astrophysical Journal Supplement Series
Thick disks are a prevalent feature observed in numerous disk galaxies, including our own Milky Way. Their significance has been reported to vary widely, ranging from a few percent to 100% of the disk mass, depending on the galaxy and the measurement ...
Sukyoung K. Yi, J. K. Jang, Julien Devriendt, Yohan Dubois, San Han, Taysun Kimm, Katarina Kraljic, Minjung Park, Sebastien Peirani, Christophe Pichon, Jinsu Rhee   +10 more
doaj   +1 more source

On the correlation of elemental abundances with kinematics among galactic disk stars

, 2004
We have performed the detailed analysis of 174 high-resolution spectra of FGK dwarfs obtained with the ELODIE echelle spectrograph at the Observatoire de Haute-Provence.
Korotin, S. A., Kovtyukh, V. V., Mishenina, T. V., Soubiran, C.   +3 more
core   +1 more source

Extraplanar H II Regions in Spiral Galaxies. I. Low-Metallicity Gas Accreting through the Disk-Halo Interface of NGC 4013

, 2018
The interstellar thick disks of galaxies serve as the interface between the thin star-forming disk, where feedback-driven outflows originate, and the distant halo, the repository for accreted gas.
Croxall, Kevin, Howk, J. Christopher, Lehner, Nicolas, Rueff, Katherine M., Savage, Blair D., Wotta, Christopher B.   +5 more
core   +1 more source