Results 31 to 40 of about 451,370 (306)

Equivalent width Measurements in Optical Spectra of Galaxies in Local Clusters: Hints On the Star Formation History in Clusters

Open Astronomy, 2011
Equivalent widths of spectral lines in the optical spectra of galaxies are commonly used to characterize their stellar populations and to get some insight on their evolution.
Fritz Jacopo, Poggianti Bianca M., Cava Antonio, Moretti Alessia   +3 more
doaj   +1 more source

A Lepton–Hadron Model for the Multi-Wavelength Emission from Extreme High-Frequency Peaked BL Lacertae 1ES 1218+304

Galaxies, 2023
We develop a lepton–hadron model for the possible origin of hard very high energy (VHE) spectra from a distant blazar. The model includes synchrotron self-Compton (SSC) and hadronic components.
Wenjing Dong, Qian Dong, Yonggang Zheng
doaj   +1 more source

266 E+A Galaxies Selected from the Sloan Digital Sky Survey Data Release 2: The Origin of E+A Galaxies

, 2005
E+A galaxies are characterized as a galaxy with strong Balmer absorption lines but without any [OII] nor H$\alpha$ emission lines. The existence of strong Balmer absorption lines indicates that E+A galaxies have experienced starburst within recent one ...
Abadi, Abazajian, Abraham, Barger, Bartholomew, Bekki, Belloni, Bennett, Blake, Blanton, Butcher, Caldwell, Caldwell, Caldwell, Carter, Castander, Chang, Couch, Couch, Dressler, Dressler, Dressler, Dressler, Fabricant, Farouki, Fisher, Fujita, Fujita, Fujita, Fujita, Galaz, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Goto, Gunn, Hashimoto, Kent, Lavery, Lavery, Liu, Liu, MacLaren, Mateus, Mihos, Miller, Morris, Moss, Moss, Newberry, Norton, Oegerle, Poggianti, Poggianti, Poggianti, Postman, Quilis, Quintero, Rose, Schweizer, Schweizer, Scranton, Sharples, Shimasaku, Shioya, Shioya, Smail, Spitzer, Strateva, Tanaka, Tomotsugu Goto, Tran, Tran, Yamauchi   +79 more
core   +2 more sources

CANDELS Observations Of The Structural Properties Of Cluster Galaxies At Z=1.62 [PDF]

, 2012
We discuss the structural and morphological properties of galaxies in a z = 1.62 proto-cluster using near-IR imaging data from Hubble Space Telescope Wide Field Camera 3 data of the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS).
Bassett, Robert, Bell, Eric F., Conselice, Christopher J., Dekel, Avishai, Dunlop, J. S., Faber, S. M., Farrah, D., Ferguson, Henry C., Finkelstein, Keely D., Finkelstein, Steven L., Guo, Y. C., Haussler, Boris, Kocevski, D. D., Koekemoer, A. M., Koo, D. C., Lotz, Jennifer M., McGrath, E. J., McIntosh, Daniel H., McLure, R. J., Momcheva, I., Newman, Jeffrey A., Papovich, Casey, Rudnick, Gregory, Tran, K. V., van der Wel, A., Weiner, B., Willmer, Christopher N. A., Wuyts, S.   +27 more
core   +1 more source

Unlocking the Power of Quercetin‐Encapsulated Mesoporous Bioactive Glass Nanoparticles: A Multifunctional Approach to Bone Regeneration

Advanced Engineering Materials, EarlyView.
Mesoporous bioactive glass nanoparticles (MBGNs) are investigated for bone regeneration given their remarkable structural and functional properties. MBGNs are functionalized with Mn and Cu and incorporated with quercetin, a natural flavonoid exhibiting antioxidant, anti‐inflammatory, and antimicrobial properties.
Giovanni Lo Bello, Qaisar Nawaz, Pier Francesco Ferrari, Laura Pastorino, Roberto Raiteri, Aldo R. Boccaccini   +5 more
wiley   +1 more source

The Role of Starbursts in the Formation of Galaxies & Active Galactic Nuclei

, 1999
Starbursts are episodes of intense star-formation in the central regions of galaxies, and are the sites of roughly 25% of the high-mass star-formation in the local universe.
Buat V., C. S. Frenk, Dunlop J., S. D. M. White, Schmitt H., Timothy Heckman   +5 more
core   +1 more source

High‐Density Boron Nitride Nanotube Composites via Surfactant‐Stabilized Lyotropic Liquid Crystals for Enhanced Space Radiation Shielding

Advanced Functional Materials, EarlyView.
High‐density BNNT films, enabling mechanical robustness and high space radiation shielding effectiveness, are fabricated using surfactant‐stabilized BNNT liquid crystal. Simulations indicate that a 50 g cm−2 BNNT film can reduce radiation exposure by 56% compared to zero shielding, potentially doubling the duration of astronaut missions on the lunar ...
Young‐Kyeong Kim, Ik Jae Lim, Hongjin Lim, Yongbi Joo, Jueun Park, Md Monir Hossain, Hyunjin Cho, Nam‐Ho You, Seokhoon Ahn, Hunsu Lee, Sang Seok Lee, Yongho Joo, Se Youn Moon, Hee Il Yoo, Calista Lum, Cheol Park, Siyoung Q. Choi, Se Gyu Jang   +17 more
wiley   +1 more source

The Host Galaxies of Short GRBs as Probes of Their Progenitor Properties

Galaxies, 2019
We present and discuss the properties of host galaxies of short Gamma-ray Burst (SGRBs). In particular, we examine those observations that contribute to the understanding of the progenitor systems of these explosions. Most SGRB hosts are found to be star
Massimiliano De Pasquale
doaj   +1 more source

New Strong Constraints on the Central Behaviour of Spherical Galactic Models

Astronomy, 2023
First of all, we show that any spherically symmetric galactic model with integrated mass profile M(r)→0 as r→0 is physically correct close to the centre only provided that the circular velocity vc(r)→0 and the gravitational field g(r)→0 as r→0.
Marco Roncadelli, Giorgio Galanti
doaj   +1 more source

THE CANADA-FRANCE REDSHIFT SURVEY IX: HST Imaging of High-Redshift Field Galaxies

, 1995
HST B and I images are presented of 32 CFRS galaxies with secure redshifts in the range 0.5 < z < 1.2. These galaxies exhibit the same range of morphological types as seen locally, i.e., ellipticals, spirals and irregulars.
Crampton, David, Fevre, O. Le, Hammer, F., Lilly, S. J., Schade, D. J., Tresse, L.   +5 more
core   +2 more sources