Search Publications
The z=2.51 Extremely Red Submillimeter Galaxy SMM J04431+0210
Ivison, R. J.; Frayer, D. T.; Smail, Ian +4 more
We report the redshift measurement for the submillimeter selected galaxy SMM J04431+0210 (N4) using the Near Infrared Spectrograph on the Keck II Telescope. The data show Hα, [N II] λλ6583, 6548, and [O III] λ5007 lines at a redshift of z=2.51. The high nuclear [N II]/Hα line ratio is consistent with a LINER or type II active galactic nucleus (AGN…
Sympathetic Coronal Mass Ejections
Moon, Y. -J.; Wang, Haimin; Choe, G. S. +1 more
We address the question whether there exist sympathetic coronal mass ejections (CMEs), which take place almost simultaneously in different locations with a certain physical connection. For this study, the following three investigations are performed. First, we have examined the waiting-time distribution of the CMEs that were observed by the SOHO L…
Anatomy of the Herbig-Haro object HH7 bow shock
Smith, Michael D.; Davis, Christopher J.; Khanzadyan, Tigran
We perform a detailed shock diagnosis of the Herbig-Haro object HH7, a well-defined bow shock from a protostellar outflow. We first present molecular hydrogen images in the 2-1 S(1) and 1-0 S(1) K-band emission lines. We then introduce revised models for magneto-hydrodynamic bow shocks that incorporate a limited C and O chemistry and account for t…
X-Ray Observations of the Compact Central Object in Supernova Remnant G347.3-0.5
Gaensler, B. M.; Hughes, J. P.; Galloway, D. K. +4 more
We present Chandra, XMM-Newton, and Rossi X-Ray Timing Explorer observations of 1WGA J1713.4-3949, a compact source at the center of the Galactic supernova remnant (SNR) G347.3-0.5. The X-ray spectrum of the source is well fitted by the sum of a blackbody component with a temperature of ~0.4 keV plus a power-law component with a photon index of ~4…
Searching for Bulges at the End of the Hubble Sequence
Böker, Torsten; van der Marel, Roeland P.; Stanek, Rebecca
We investigate the stellar disk properties of a sample of 19 nearby spiral galaxies with low inclination and late Hubble type (Scd or later). We combine our high-resolution Hubble Space Telescope I-band observations with existing ground-based optical images to obtain surface brightness profiles that cover a high dynamic range of galactic radii. Mo…
Absorption-Line Systems and Galaxies in Front of the Second-brightest Quasar, PHL 1811
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B. +4 more
The extraordinarily bright quasar PHL 1811, at a redshift zem=0.192, provides an attractive opportunity to use ultraviolet absorption-line spectroscopy to study the properties of gas systems in the local universe. A short (11.3 ks), exploratory spectrum of this object was obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE) wit…
Far infra-red emission from NGC 7078: First detection of intra-cluster dust in a globular cluster
van Loon, J. Th.; Eyres, S. P. S.; Evans, A. +3 more
Improved data analysis of far infrared imaging data of the globular cluster NGC 7078 obtained with the ISO instrument ISOPHOT at 60 µm, 70 µm and 90 µm has detected the thermal emission from dust in its core, the first secure detection of intra-cluster dust in a globular cluster. The amount of dust is broadly consistent with mass…
Massive Elliptical Galaxies at High Redshift: NICMOS Imaging of z~1 Radio Galaxies
Dickinson, Mark; Dey, Arjun; Zirm, Andrew W.
We present deep, ~1.6 µm, continuum images of 11 high-redshift (0.811<z<1.875) 3CR radio galaxies observed with NICMOS on board the Hubble Space Telescope. Our NICMOS images probe the rest-frame optical light where stars are expected to dominate the galaxy luminosity. The rest-frame ultraviolet light of eight of these galaxies demonstr…
An XMM-Newton view of the extended ``filament'' near the cluster of galaxies Abell 85
Churazov, E.; Forman, W.; Durret, F. +1 more
We have observed with XMM-Newton the extended 4 Mpc filament detected by the ROSAT PSPC in the neighbourhood of the cluster of galaxies Abell 85. We confirm that there is an extended feature, aligned at the same position angle as the major axis of the central cD, the bright cluster galaxies, and nearby groups and clusters. We find that the X-ray e…
MHD tomography using interplanetary scintillation measurement
Hayashi, Keiji; Kojima, Masayoshi; Tokumaru, Munetoshi +1 more
The MHD tomography analysis, an advanced version of the computer-assisted tomography (CAT) analysis for interplanetary scintillation (IPS) observational data, is presented. When combined with a MHD simulation, the CAT analysis can reconstruct the MHD-based three-dimensional solar wind structure within 1 AU from the IPS line-of-sight integrated vel…