Science Archives Publication System

A Chandra Study of the Multicomponent X-Ray Emission from the X-shaped Radio Galaxy 3C 403

DOI: 10.1086/427822 Bibcode: 2005ApJ...622..149K

Hardcastle, M. J.; Worrall, D. M.; Murray, S. S. +1 more

We present results from a 49.4 ks Chandra ACIS-S observation of the nearby (z=0.059) X-shaped FR type II (FR II) radio galaxy 3C 403. This is the first Chandra observation of an X-shaped radio galaxy, and one of the goals of this pioneering study is to determine the relationship between the X-ray-emitting gas and the X-shaped radio morphology. We …

2005 • The Astrophysical Journal

eHST 94

The first observed stellar X-ray flare oscillation: Constraints on the flare loop length and the magnetic field

DOI: 10.1051/0004-6361:20052834 Bibcode: 2005A&A...436.1041M

Mitra-Kraev, U.; Harra, L. K.; Williams, D. R. +1 more

We present the first X-ray observation of an oscillation during a stellar flare. The flare occurred on the active M-type dwarf AT Mic and was observed with XMM-Newton. The soft X-ray light curve (0.2-12 keV) is investigated with wavelet analysis. The flare's extended, flat peak shows clear evidence for a damped oscillation with …

2005 • Astronomy and Astrophysics

XMM-Newton 93

The Opacity of Spiral Galaxy Disks. IV. Radial Extinction Profiles from Counts of Distant Galaxies Seen through Foreground Disks

DOI: 10.1086/427716 Bibcode: 2005AJ....129.1396H

Allen, Ronald J.; Holwerda, B. W.; van der Kruit, P. C. +1 more

Dust extinction can be determined from the number of distant field galaxies seen through a spiral disk. To calibrate this number for the crowding and confusion introduced by the foreground image, González et al. and Holwerda et al. developed the Synthetic Field Method (SFM), which analyzes synthetic fields constructed by adding various deep exposu…

2005 • The Astronomical Journal

eHST 93

Drift-Kinetic Alfvén Waves Observed near a Reconnection X Line in the Earth's Magnetopause

DOI: 10.1103/PhysRevLett.95.065002 Bibcode: 2005PhRvL..95f5002C

Balogh, A.; Reme, H.; Goldstein, M. L. +7 more

We identify drift-kinetic Alfvén waves in the vicinity of a reconnection X line on the Earth’s magnetopause. The dispersive properties of these waves have been determined using wavelet interferometric techniques applied to multipoint observations from the Cluster spacecraft. Comparison of the observed wave dispersion with that expected for drift-k…

2005 • Physical Review Letters

Cluster 93

An X-Ray Variable Millisecond Pulsar in the Globular Cluster 47 Tucanae: Closing the Link to Low-Mass X-Ray Binaries

DOI: 10.1086/432249 Bibcode: 2005ApJ...630.1029B

Bogdanov, Slavko; van den Berg, Maureen; Grindlay, Jonathan E.

We report the discovery of peculiar X-ray spectral variability in the binary radio millisecond pulsar PSR J0024-7204W in the globular cluster 47 Tuc. The observed emission consists of a dominant nonthermal component, which is eclipsed for a portion of the orbit, and a thermal component, which appears to be persistent. We propose that the nontherma…

2005 • The Astrophysical Journal

eHST 93

Size distribution of circumstellar disks in the Trapezium cluster

DOI: 10.1051/0004-6361:20053540 Bibcode: 2005A&A...441..195V

Alves, J.; Vicente, S. M.

In this paper we present results on the size distribution of circumstellar disks in the Trapezium cluster as measured from HST/WFPC2 data. Direct diameter measurements of a sample of 135 bright proplyds and 14 silhouettes disks suggest that there is a single population of disks well characterized by a power-law distribution with…

2005 • Astronomy and Astrophysics

eHST 93

An Earth-like correspondence between Saturn's auroral features and radio emission

DOI: 10.1038/nature03334 Bibcode: 2005Natur.433..722K

Gurnett, D. A.; Dougherty, M. K.; Kurth, W. S. +12 more

Saturn is a source of intense kilometre-wavelength radio emissions that are believed to be associated with its polar aurorae, and which provide an important remote diagnostic of its magnetospheric activity. Previous observations implied that the radio emission originated in the polar regions, and indicated a strong correlation with solar wind dyna…

2005 • Nature

Cassini eHST 93

Moving Magnetic Features around Sunspots

DOI: 10.1086/497367 Bibcode: 2005ApJ...635..659H

Shine, Richard A.; Hagenaar, Hermance J.

We study statistical properties of small-scale magnetic features around sunspots using time sequences of high-resolution magnetograms of eight sunspots made with the Michelson Doppler Imager (MDI) on board SOHO. Flow maps around the spots are also derived from cross-correlation analysis of MDI continuum or TRACE white light and used for comparison…

2005 • The Astrophysical Journal

SOHO 92

Magnetic Reconnection Flux and Coronal Mass Ejection Velocity

DOI: 10.1086/498716 Bibcode: 2005ApJ...634L.121Q

Qiu, Jiong; Yurchyshyn, Vasyl B.

We explore the relationship between the total reconnection flux ψ_rec estimated from flare observations and the velocity V_CME of coronal mass ejections (CMEs) observed with the Large Angle and Spectrometric Coronagraph (LASCO) Experiment. Our study includes 13 events with varying magnetic configurations in source regions. It i…

2005 • The Astrophysical Journal

SOHO 92

Stellar Disk Truncations at High z: Probing Inside-Out Galaxy Formation

DOI: 10.1086/491472 Bibcode: 2005ApJ...630L..17T

Trujillo, Ignacio; Pohlen, Michael

We have conducted a systematic search for stellar disk truncations in disklike galaxies at intermediate redshift (z<1.1) using the Hubble Ultra Deep Field data. We use the position of the truncation as a direct estimator of the size of the stellar disk. After accounting for the surface brightness evolution of the galaxies, our results suggest t…

2005 • The Astrophysical Journal

eHST 92