Search Publications
Physical properties and evolutionary state of the Lyman alpha emitting starburst galaxy IRAS 08339+6517
Schaerer, D.; Östlin, G.; Hayes, M. +5 more
Context. Though Lyα emission is one of the most used tracers of massive star formation at high redshift, it is strongly affected by neutral gas radiation transfer effects. A correct understanding of these effects is required to properly quantify the star formation rate along the history of the Universe.
Aims: We aim to parameterize the escape…
The protoplanetary disk of FT Tauri: multiwavelength data analysis and modeling
Ménard, F.; Woitke, P.; Kamp, I. +7 more
Context. Investigating the evolution of protoplanetary disks is crucial for our understanding of star and planet formation. There have been several theoretical and observational studies in past decades to advance this knowledge. The launch of satellites operating at infrared wavelengths, such as the Spitzer Space Telescope and the Herschel Space O…
Are the Faint Structures Ahead of Solar Coronal Mass Ejections Real Signatures of Driven Shocks?
Moon, Y. -J.; Lee, Kyoung-Sun; Kim, Sujin +3 more
Recently, several studies have assumed that the faint structures ahead of coronal mass ejections (CMEs) are caused by CME-driven shocks. In this study, we have conducted a statistical investigation to determine whether or not the appearance of such faint structures depends on CME speeds. For this purpose, we use 127 Solar and Heliospheric Observat…
A 30 kpc Chain of "Beads on a String" Star Formation between Two Merging Early Type Galaxies in the Core of a Strong-lensing Galaxy Cluster
Baum, Stefi A.; O'Dea, Christopher P.; Rigby, Jane R. +10 more
New Hubble Space Telescope ultraviolet and optical imaging of the strong-lensing galaxy cluster SDSS J1531+3414 (z = 0.335) reveals two centrally dominant elliptical galaxies participating in an ongoing major merger. The interaction is at least somewhat rich in cool gas, as the merger is associated with a complex network of 19 massive supercluster…
Detection of a dense clump in a filament interacting with W51e2
Persson, C. M.; Gerin, M.; Goldsmith, P. F. +8 more
In the framework of the Herschel/PRISMAS guaranteed time key program, the line of sight to the distant ultracompact H ii region W51e2 has been observed using several selected molecular species. Most of the detected absorption features are not associated with the background high-mass star-forming region and probe the diffuse matter along the line o…
Power spectrum analysis of limb and disk spicule using Hinode Ca H-line broadband filter
Tavabi, E.
We present observations of a solar quiet region obtained using the Hinode Solar Optical telescope (SOT) in the Ca II H-line with broadband filter taken on November 2006. We study off-limb and on-disk spicules to find a counterpart of the limb spicule on the disk. This investigation shows a strong correspondence between the limb and near limb spicu…
Automated Detection of Low-Contrast Solar Features Using the Phase-Congruency Algorithm
Yang, Yunfei; Ji, Kaifan; Feng, Song +3 more
We propose a new feature-detection technique based on phase-congruency (PC) measurements to automatically recognize or enhance faint features in solar observations, such as off-limb coronal loops and umbral dots. Compared with other feature-detection methods that are based on gradient illuminance and imaging filtering, PC-based measurements are pa…
Merger Signatures in the Galaxy Cluster A98
Paterno-Mahler, R.; Johnson, R. E.; Bulbul, E. +5 more
We present results from Chandra and XMM-Newton observations of Abell 98 (A98), a galaxy cluster with three major components: a relatively bright subcluster to the north (A98N), a disturbed subcluster to the south (A98S), and a fainter subcluster to the far south (A98SS). We find evidence for surface brightness and temperature asymmetries in A98N c…
A Detailed Study of the Structure of the Nested Planetary Nebula, Hb 12, the Matryoshka Nebula
Winge, C.; López, J. A.; Edwards, M. L. +1 more
We present near-IR, integral field spectroscopic observations of the planetary nebula (PN) Hb 12 using Near-infrared Integral Field Spectrograph (NIFS) on Gemini-North. Combining NIFS with the adaptive optics system Altair, we provide a detailed study of the core and inner structure of this PN. We focus the analysis in the prominent emission lines…
Hard X-ray emission cutoff in the anomalous X-ray pulsar 4U 0142+61 detected by INTEGRAL
Wang, Wei; Guo, Yan-Jun; Tong, Hao
The anomalous X-ray pulsar 4U 0142+61 has been studied with observations from INTEGRAL. The hard X-ray spectrum in the range 18-500 keV for 4U 0142+61 was derived using nearly nine years of INTEGRAL/IBIS data. We obtained the average hard X-ray spectrum of 4U 0142+61 with all available data. The spectrum of 4U 0142+61 can be fitted with a power la…