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Extended Tidal Structure in Two Lyα-emitting Starburst Galaxies
Cannon, John M.; Skillman, Evan D.; Östlin, Göran +4 more
We present new Very Large Array (VLA) C-configuration H I imaging of the Lyα-emitting starburst galaxies Tol 1924-416 and IRAS 08339+6517. The effective resolution probes neutral gas structures larger than 4.7 kpc in Tol 1924-416 and larger than 8.1 kpc in IRAS 08339+6517. Both systems are revealed to be tidally interacting: Tol 1924-416 with ESO …
The H II Regions of the Damped Lyα Absorber SBS 1543+593
Turnshek, David A.; Rao, Sandhya M.; Pettini, Max +3 more
We report new imaging and spectroscopic observations of the damped Lyα absorber (DLA) galaxy SBS 1543+593, a nearby dwarf galaxy whose stellar disk is intersected by the sight line to the bright background QSO HS 1543+5921. Hubble Space Telescope imaging observations with WFPC2 in the F450W and F702W bands are used to measure the DLA galaxy's prop…
Quasi-simultaneous XMM-Newton and VLA observation of the non-thermal radio emitter HD 168112 (O5.5III(f+))
Blomme, R.; Rauw, G.; De Becker, M. +8 more
We report the results of a multiwavelength study of the non-thermal radio emitter HD 168112 (O5.5III(f+)). The detailed analysis of two quasi-simultaneous XMM-Newton and VLA observations reveals strong variability of this star both in the X-ray and radio ranges. The X-ray observations separated by five months reveal a decrease of the X-…
The spectral energy distributions of the revised 200-mJy sample
Bondi, M.; Browne, I. W. A.; Antón, S. +2 more
We address the question of why low-luminosity radio sources with similar flat radio spectra show a range of optical activity. The investigation is based on the spectral energy distributions (SEDs) of objects from the 200-mJy sample. We gathered new data from the VLA at 43 GHz, from SCUBA in the JCMT at 2000, 1350 and 850 µm, and from the ISO…
Characteristics of quasi-static potential structures observed in the auroral return current region by Cluster
André, M.; Buchert, S.; Kistler, L. M. +6 more
Temporal and spatial characteristics of intense quasi-static electric fields and associated electric potential structures in the return current region are discussed using Cluster observations at geocentric distances of about 5 Earth radii. Results are presented from four Cluster encounters with such acceleration structures to illustrate common as …
The X-Ray Spectrum of the z=6.30 QSO SDSS J1030+0524
Farrah, D.; McMahon, R.; Priddey, R. +2 more
We present a deep XMM-Newton observation of the z=6.30 QSO SDSS J1030+0524, the second most distant quasar currently known. The data contain sufficient counts for spectral analysis, demonstrating the ability of XMM-Newton to measure X-ray spectral shapes of z~6 QSOs with integration times >~100 ks. The X-ray spectrum is well fitted by a power l…
Dynamics and Radiation of Young Type-Ia Supernova Remnants: Important Physical Processes
Lundqvist, P.; Sorokina, E. I.; Blinnikov, S. I. +1 more
We analyze the physical processes that should be taken into account when modeling young type-Ia supernova remnants (SNRs) with ages of several hundred years in which forward (into the interstellar medium) and reverse (into the ejection) shocks propagate. We show that the energy losses in a heavy-element-rich ejection can be significant for SNRs ev…
A Bias in Optical Observations of High-Redshift Luminous Infrared Galaxies
Le Floc'h, E.; Charmandaris, V.; Mirabel, I. F.
We present evidence for the dramatically different morphology between the rest-frame UV and 7 µm mid-IR emission of VV 114 and Arp 299, two nearby (z~0) violently interacting luminous infrared galaxies (LIRGs). Nearly all LIRGs are interacting systems, and it is currently accepted that they dominate the IR emission at z>1. LIRGs located a…
Three-Dimensional Photoionization Structure and Distances of Planetary Nebulae. I. NGC 6369
Monteiro, Hektor; Heathcote, Steve; Schwarz, Hugo E. +1 more
We present the results of mapping the planetary nebula NGC 6369 by using multiple long-slit spectra taken with the Cerro Tololo Inter-American Observatory 1.5 m telescope. We create two-dimensional emission-line images from our spectra and use these to derive fluxes for 17 lines, the Hα/Hβ extinction map, the [S II ] line ratio density map, and th…
An XMM-Newton view of M101 - I. The luminous X-ray source population
Warwick, R. S.; Roberts, T. P.; Ward, M. J. +2 more
We present the first results of an XMM-Newton EPIC observation of the luminous X-ray source population in the face-on supergiant spiral galaxy M101. We have studied the spectral and temporal properties of the 14 most luminous sources, all of which have intrinsic X-ray luminosities exceeding the Eddington limit for a 1.4-Msolar neutron s…