The luminosities of type Ia supernovae (SNe), the thermonuclear explosions of white-dwarf stars, vary systematically with their intrinsic color and the rate at which they fade. From images taken with the Galaxy Evolution Explorer (GALEX), we identified SNe Ia that erupted in environments that have high ultraviolet surface brightness and star-formation surface density. When we apply a steep model extinction law, we calibrate these SNe using their broadband optical light curves to within ~0.065 to 0.075 magnitude, corresponding to <4% in distance. The tight scatter, probably arising from a small dispersion among progenitor ages, suggests that variation in only one progenitor property primarily accounts for the relationship between their light-curve widths, colors, and luminosities.

Download full-text PDF

Source
http://dx.doi.org/10.1126/science.1261475DOI Listing

Publication Analysis

Top Keywords

distances
4
distances
1

Similar Publications

Background And Objectives: A typical workflow for deep brain stimulation (DBS) surgery consists of head frame placement, followed by stereotactic computed tomography (CT) or MRI before surgical implantation of the hardware. At some institutions, this workflow is prolonged when the imaging scanner is located far away from the operating room, thereby increasing workflow times by the addition of transport times. Recently, the intraoperative O-arm has been shown to provide accurate image fusion with preoperative CT or MR imaging, suggesting the possibility of obtaining an intraoperative localization scan and postoperative confirmation.

View Article and Find Full Text PDF

Background And Objectives: Accurate intraoperative assessment of coronal alignment is critical to achieving favorable clinical outcomes in adult spinal deformity surgery. However, surgical positioning creates challenges in predicting standing coronal alignment. Gravity-based plumblines require an upright posture and are not possible intraoperatively.

View Article and Find Full Text PDF

The hippocampal dentate gyrus (DG) is thought to orthogonalize inputs from the entorhinal cortex (pattern separation) and relay this information to the CA3 region. In turn, attractor dynamics in CA3 perform a pattern completion or error correction operation before sending its output to CA1. In a mouse model of congenital hypoplasia of the DG, a deficiency in the (Wls) gene, specifically in cells expressing , which targets neuronal progenitors, led to an almost total absence of dentate granule cells and modestly impaired performance in spatial tasks.

View Article and Find Full Text PDF

A feature-based approach for atlas selection in automatic pelvic segmentation.

PLoS One

January 2025

Department of Radiation Physics, Zhejiang Key Laboratory of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou Institute of Medicine (HIM), Chinese Academy of Sciences, Hangzhou, Zhejiang, China.

Accurate and efficient automatic segmentation is essential for various clinical tasks such as radiotherapy treatment planning. However, atlas-based segmentation still faces challenges due to the lack of representative atlas dataset and the computational limitations of deformation algorithms. In this work, we have proposed an atlas selection procedure (subset atlas grouping approach, MAS-SAGA) which utilized both image similarity and volume features for selecting the best-fitting atlases for contour propagation.

View Article and Find Full Text PDF
Article Synopsis
  • Laser-structuring techniques, particularly Direct Laser Interference Patterning, can significantly enhance the performance of pure Ni electrodes in water electrolysis by optimizing their structure.
  • A study revealed that the spatial distance between laser-structures is critical for improving electrode performance, resulting in an increase in the electrochemically active surface area by up to 12 times compared to nonstructured electrodes.
  • Optimal structuring leads to lower onset potential and overpotential during the oxygen evolution reaction due to the superhydrophilic surface, which enhances bubble growth dynamics and minimizes electrode resistance.
View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!