Science Archives Publication System

A Quadrupolar Preplanetary Nebula: IRAS 19475+3119

DOI: 10.1086/511294 Bibcode: 2007ApJ...658..410S

Sahai, Raghvendra; Sánchez Contreras, Carmen; Morris, Mark +1 more

Our imaging of the preplanetary nebula IRAS 19475+3119 (hereafter I19475) at 0.43 and 0.6 µm with HST reveals a quadrupolar nebula of size about 10.5^''×4.7^'', with two bipolar elongated lobes emanating from the center of the nebula. One of the bipolar lobes shows detailed point-symmetric structure with respect to the ce…

2007 • The Astrophysical Journal

eHST 29

Coronal and Chromospheric Dimmings during a Halo-Type CME Event

DOI: 10.1086/519490 Bibcode: 2007ApJ...662L.131J

Yang, Liheng; Jiang, Yunchun; Li, Kejun +1 more

We present complementary solar observations of a filament eruption occurring in association with a halo-type coronal mass ejection (CME) on 2006 July 6 in AR 10898. This eruption was followed by an M2.5 flare and has led to the formation of a pair of dimmings, observed in Hα, over network patterns in regions of opposite magnetic polarities located…

2007 • The Astrophysical Journal

SOHO 29

Search for tidal dwarf galaxy candidates in a sample of ultraluminous infrared galaxies

DOI: 10.1051/0004-6361:20066760 Bibcode: 2007A&A...472..421M

Colina, L.; Monreal-Ibero, A.; Arribas, S. +1 more

Context: Small star-forming galaxies made out of collisional debris have been found in a variety of merging systems. So far only a few of them are known in Ultraluminous Infrared Galaxies (ULIRGs) although they show clear signs of interactions. Whether external star formation may take place in such objects in an open question.
Aims: The aim of…

2007 • Astronomy and Astrophysics

eHST 29

Saturn's auroral/polar H ⁺₃ infrared emission . I. General morphology and ion velocity structure

DOI: 10.1016/j.icarus.2006.12.027 Bibcode: 2007Icar..189....1S

Melin, Henrik; Miller, Steve; Stallard, Tom +3 more

We present an analysis of an extensive dataset of observations of the auroral/polar regions of Saturn, carried out in 2004 and 2005 using the high-resolution facility spectrometer CSHELL on the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii. The paper outlines the morphology of emission in the H ⁺₃νQ(1,0) line a…

2007 • Icarus

Cassini 29

The X-Ray Structure and Spectrum of the Pulsar Wind Nebula Surrounding PSR B0540-69.3

DOI: 10.1086/518019 Bibcode: 2007ApJ...662..988P

Safi-Harb, S.; Holt, S. S.; Williams, R. M. +2 more

We present the first spatially resolved spectral study of an extragalactic pulsar wind nebula (PWN), that surrounding the 50 ms pulsar B0540-69.3 in the Large Magellanic Cloud, using the ACIS instrument on board the Chandra X-ray Observatory. The spectral properties of the PWN change at a radius of ~5", corresponding to a shell detected optically …

2007 • The Astrophysical Journal

eHST 29

Elemental Abundances of Nearby Galaxies through High Signal-to-Noise Ratio XMM-Newton Observations of Ultraluminous X-Ray Sources

DOI: 10.1086/510200 Bibcode: 2007ApJ...655..163W

Reynolds, Christopher S.; Mushotzky, Richard F.; Winter, Lisa M.

In this paper we examined XMM-Newton EPIC spectra of 14 ultraluminous X-ray sources (ULXs) in addition to the XMM-Newton RGS spectra of two sources (Holmberg II X-1 and Holmberg IX X-1). We determined oxygen and iron abundances of the host galaxy's ISM using K-shell (O) and L-shell (Fe) X-ray photoionization edges toward these ULXs. We found that …

2007 • The Astrophysical Journal

XMM-Newton 29

Saturn's neutral torus versus Jupiter's plasma torus

DOI: 10.1029/2007GL029437 Bibcode: 2007GeoRL..34.9105D

Delamere, P. A.; Bagenal, F.; Ray, L. C. +1 more

With the recent discovery of an atmospheric plume of H₂O it is thought that Enceladus could deliver as much as 300 kg/s of neutral gas to Saturn's inner magnetosphere. Io is the source of roughly 1 ton/s of sulfur and oxygen gas at Jupiter. Despite the apparent similarity, the neutral/ion ratio at Saturn is 3 orders of magnitude higher …

2007 • Geophysical Research Letters

Cassini 29

D/H and Nearby Interstellar Cloud Structures

DOI: 10.1007/s11214-007-9160-z Bibcode: 2007SSRv..130..367L

Linsky, J. L.

Analysis of UV spectra obtained with the HST, FUSE and other satellites provides a new understanding of the deuterium abundance in the local region of the galactic disk. The wide range of gas-phase D/H measurements obtained outside of the Local Bubble can now be explained as due to different amounts of deuterium depletion on carbonaceous grains. T…

2007 • Space Science Reviews

eHST 29

Effects of a large convective storm on Saturn's equatorial jet

DOI: 10.1016/j.icarus.2006.10.020 Bibcode: 2007Icar..187..520S

Showman, Adam P.; Sayanagi, Kunio M.

Hubble Space Telescope observations revealed that Saturn's equatorial jet at the cloud level blows at ∼275 m s ^-1 today, approximately half the ∼470 m s ^-1 wind during the Voyager flybys in 1980-1981. Radiative transfer calculations estimate the clouds to be significantly higher today than in 1980. The higher clouds make it d…

2007 • Icarus

Cassini 28

High-resolution X-ray spectroscopy and imaging of the nuclear outflow of the starburst galaxy NGC 253

DOI: 10.1051/0004-6361:20066340 Bibcode: 2007A&A...467..979B

Pietsch, W.; Ehle, M.; Bauer, M. +3 more

Aims:Using XMM-Newton data, we have studied the nuclear outflow of the nearby starburst galaxy NGC 253 in X-rays with respect to its morphology and to spectral variations along the outflow.
Methods: We analysed XMM-Newton RGS spectra, RGS brightness profiles in cross-dispersion direction, narrow-band RGS and EPIC images, and EPIC PN brightness…

2007 • Astronomy and Astrophysics

XMM-Newton 28