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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…
Response of Hinode XRT to quiet Sun, active region and flare plasma
Mason, H. E.; Del Zanna, G.; O'Dwyer, B.
Aims: We examine the response of the Hinode X-Ray Telescope (XRT), using simultaneous observations with the Hinode Extreme-ultraviolet Imaging Spectrometer (EIS), for a flare, an active region and a quiet Sun region. We also examine the relative intensity calibration of EIS and XRT.
Methods: EIS differential emission measure distribution…
Astrometry of χ and H Persei Based on Processing of Digitized Plates of Archive of the Astronomical Institute of the Academy of Sciences of the Republic of Uzbekistan
Ehgamberdiev, Sh. A.; Muminov, M. M.; Yuldoshev, Q. X. +3 more
Work is done with Epson Expression 10000XL scanner of Astronomical Institute (AI) of the Academy of Sciences of Uzbekistan. The plates were exposed with the Normal astrograph (D/F = 330mm / 3467mm, M = 59.56"/mm). The digitization of plates with (16x16) cm in size was made with resolution of 1200 dpi (1px = 1.25"). Test research was done using pla…