Results 51 to 60 of about 1,203,775 (345)

X-ray Sources and their Optical Counterparts in the Globular Cluster M4

, 2004
We report on the Chandra X-ray Observatory ACIS-S3 imaging observation of the Galactic globular cluster M4 (NGC 6121). We detect 12 X-ray sources inside the core and 19 more within the cluster half-mass radius. The limiting luminosity of this observation
Anderson, S.F., Astrophysics, Bassa, C.G., Dep Natuurkunde, Gaensler, B.M., Homer, L., Kaspi, V.M., Lewin, W.H.G., Margon, B., Pooley, D., Universiteit Utrecht, van der Klis, M., Verbunt, F.W.M.   +12 more
core   +2 more sources

The X-ray properties of high-z FRI candidates in the COSMOS field [PDF]

, 2011
We report the X-ray analysis of a sample of candidate high-redshift ...
Andreon, Antonucci, Balmaverde, Barkhouse, Becker, Best, Blackburn, Blandford, Capetti, Cappelluti, Cash, Chiaberge, Chiaberge, Chiaberge, Demarco, Donato, Donzelli, E. Tundo, Eisenhardt, Elvis, Evans, Evans, Fabian, Fanaroff, Fassbender, Ferrarese, Gawroński, Gebhardt, Gehrels, Ghisellini, Gladders, Gopal-Krishna, Hardcastle, Hasinger, Hill, Hopkins, Ilbert, Jackson, Kaiser, Kalberla, Komatsu, Ledlow, Lilly, Livio, M. Chiaberge, Muzzin, Nousek, Owen, Owen, P. Tozzi, Pierre, Prestage, Reynolds, Rosati, Santos, Scarpa, Schinnerer, Scoville, Suhada, Tanaka, Tozzi, Tozzi, Tremaine, Trump, Urry, Wilson, Xue, Zirbel   +67 more
core   +1 more source

The role of histone modifications in transcription regulation upon DNA damage

FEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

Pulsars and X-Ray Sources [PDF]

Symposium - International Astronomical Union, 1973
We summarize some theoretical aspects of the X-ray emission from genuine pulsars and their relation to the more general problems of X-ray sources.
openaire   +1 more source

Line‐Source Based X‐Ray Tomography [PDF]

International Journal of Biomedical Imaging, 2009
Current computed tomography (CT) scanners, including micro‐CT scanners, utilize a point x‐ray source. As we target higher and higher spatial resolutions, the reduced x‐ray focal spot size limits the temporal and contrast resolutions achievable. To overcome this limitation, in this paper we propose to use a line‐shaped x‐ray source so that many more ...
Bharkhada, Deepak, Yu, Hengyong, Liu, Hong, Plemmons, Robert, Wang, Ge   +4 more
openaire   +4 more sources

Cell wall target fragment discovery using a low‐cost, minimal fragment library

FEBS Letters, EarlyView.
LoCoFrag100 is a fragment library made up of 100 different compounds. Similarity between the fragments is minimized and 10 different fragments are mixed into a single cocktail, which is soaked to protein crystals. These crystals are analysed by X‐ray crystallography, revealing the binding modes of the bound fragment ligands.
Kaizhou Yan, Mathew Stanley, Olawale Raimi, Andrew T. Ferenbach, Helge C Dorfmueller, Daan M. F. van Aalten   +5 more
wiley   +1 more source

Rooting binder-free tin nanoarrays into copper substrate via tin-copper alloying for robust energy storage

Nature Communications, 2020
The authors here report a binder-free electrode based on tin nanoarrays deposited on copper substrate. It is found that the locally formed electrochemically inactive tin-copper alloys work as a glue that bridges tin and copper to survive harsh cycling ...
Jiangfeng Ni, Xiaocui Zhu, Yifei Yuan, Zhenzhu Wang, Yingbo Li, Lu Ma, Alvin Dai, Matthew Li, Tianpin Wu, Reza Shahbazian-Yassar, Jun Lu, Liang Li   +11 more
doaj   +1 more source

Hydrogen-triggered X-Ray Bursts from SAX J1808.4−3658? The Onset of Nuclear Burning

The Astrophysical Journal, 2023
We present a study of weak, thermonuclear X-ray bursts from the accreting millisecond X-ray pulsar SAX J1808.4−3658. We focus on a burst observed with the Neutron Star Interior Composition Explorer on 2019 August 9, and describe a similar burst observed ...
Sierra Casten, Tod E. Strohmayer, Peter Bult   +2 more
doaj   +1 more source

Methods for Estimating Fluxes and Absorptions of Faint X-ray Sources

, 2009
X-ray sources with very few counts can be identified with low-noise X-ray detectors such as ACIS onboard the Chandra X-ray Observatory. These sources are often too faint for parametric spectral modeling using well-established methods such as fitting with
Arnaud, Bevington, Broos, Broos, Drake, Eric D. Feigelson, Feigelson, Feigelson, Gagné, Getman, Getman, Gordon P. Garmire, Hong, Imanishi, Konstantin V. Getman, Leisa K. Townsley, Maggio, Muno, Patrick S. Broos, Preibisch, Press, Prestwich, Saez, Sarazin, Shemmer, Smith, Townsley, Wilms, Winter   +28 more
core   +1 more source

The Chandra Source Catalog [PDF]

, 2009
The Chandra Source Catalog (CSC) is a general purpose virtual X-ray astrophysics facility that provides access to a carefully selected set of generally useful quantities for individual X-ray sources, and is designed to satisfy the needs of a broad-based ...
Anderson, Craig S., Bonaventura, Nina R., Chen, Judy C., Davis, John E., Doe, Stephen M., Evans, Ian N., Evans, Janet D., Fabbiano, Giuseppina, Galle, Elizabeth C., Gibbs II, Danny G., Glotfelty, Kenny J., Grier, John D., Hain, Roger M., Hall, Diane M., Harbo, Peter N., He, Houck, John C., Karovska, Margarita, Kashyap, Vinay L., Lauer, Jennifer, McCollough, Michael L., McDowell, Jonathan C., Miller, Joseph B., Mitschang, Arik W., Morgan, Douglas L., Mossman, Amy E., Nichols, Joy S., Nowak, Michael A., Plummer, David A., Primini, Francis A., Refsdal, Brian L., Rots, Arnold H., Siemiginowska, Aneta, Sundheim, Beth A., Tibbetts, Michael S., Van Stone, David W., Winkelman, Sherry L., Xiangqun, Zografou, Panagoula   +38 more
core   +3 more sources