Search Publications
Physical Properties of a Pilot Sample of Spectroscopic Close Pair Galaxies at z ~ 2
Shapley, Alice E.; Steidel, Charles C.; Law, David R. +1 more
We use Hubble Space Telescope Wide-field Camera 3 rest-frame optical imaging to select a pilot sample of star-forming galaxies in the redshift range z = 2.00-2.65 whose multi-component morphologies are consistent with expectations for major mergers. We follow up this sample of major merger candidates with Keck/NIRSPEC long-slit spectroscopy obtain…
A Deep Herschel/PACS Observation of CO(40-39) in NGC 1068: A Search for the Molecular Torus
Lutz, D.; Genzel, R.; Poglitsch, A. +14 more
Emission from high-J CO lines in galaxies has long been proposed as a tracer of X-ray dominated regions (XDRs) produced by active galactic nuclei (AGNs). Of particular interest is the question of whether the obscuring torus, which is required by AGN unification models, can be observed via high-J CO cooling lines. Here we report on the analysis of …
Ultraviolet Spectroscopy of PQ Gem and V405 Aur from the HST and IUE Satellites
Sanad, M. R.
Ultraviolet spectra of two intermediate polars (IPs), PQ Gem and V405 Aur, observed with Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph and Faint Object Spectrograph and International Ultraviolet Explorer (IUE) satellites were analyzed during the period between 1994-2000. We estimated the reddening of the two systems from the 22…
Prominence Visibility in Hinode/XRT Images
Heinzel, P.; Anzer, U.; Jejčič, S. +2 more
In this paper we study the soft X-ray (SXR) signatures of one particular prominence. The X-ray observations used here were made by the Hinode/X-Ray Telescope instrument using two different filters. Both of them have a pronounced peak of the response function around 10 Å. One of them has a secondary smaller peak around 170 Å, which leads to a conta…
X-Raying the Coronae of HD 155555
Singh, K. P.; Lalitha, S.; Kashyap, V. +1 more
We present an analysis of the high-resolution Chandra observation of the multiple system, HD 155555 (an RS Canum Venaticorum; RS CVn type binary system, HD 155555 AB, and its spatially resolved low-mass companion HD 155555 C). This is an intriguing system that shows properties of both an active pre-main-sequence star and a synchronized (main seque…
Chandra and XMM-Newton Observations of the Merging Cluster of Galaxies PLCK G036.7+14.9
Dahle, H.; Arnaud, M.; Pointecouteau, E. +13 more
We present Chandra and XMM-Newton observations of PLCK G036.7+14.9 from the Chandra-Planck Legacy Program. The high resolution X-ray observations reveal two close (∼72″ = 193 kpc in projection) subclusters, G036N and G036S, which were not resolved by previous ROSAT, optical, or recent Planck observations. We perform detailed imaging and spectral a…
Spectroscopic Studies of an Ultraluminous Supersoft X-Ray Source in M81
Bai, Yu; Wang, Song; Liu, JiFeng
Ultraluminous supersoft X-ray sources (ULSs) exhibit supersoft X-ray spectra with blackbody temperatures below 0.1 keV and bolometric luminosities above 1039 ergs s-1. In this Letter, we report the first optical spectroscopic observations of a ULS in M81 using the LRIS spectrograph on the Keck I telescope. The detected Balmer…
Modulation of Galactic Cosmic Rays Observed at L1 in Solar Cycle 23
Fludra, A.
We analyze a unique 15 yr record of galactic cosmic-ray (GCR) measurements made by the SOHO Coronal Diagnostic Spectrometer NIS detectors, recording integrated GCR numbers with energies above 1.0 GeV between 1996 July and 2011 June. We are able to closely reproduce the main features of the SOHO/CDS GCR record using the modulation potential calcula…
Silicates on Iapetus from Cassini’s Composite Infrared Spectrometer
Clark, Roger N.; Spencer, John R.; Wray, James J. +5 more
We present the first spectral features obtained from Cassini’s Composite Infrared Spectrometer (CIRS) for any icy moon. The spectral region covered by CIRS focal planes (FP) 3 and 4 is rich in emissivity features, but previous studies at these wavelengths have been limited by low signal-to-noise ratios (S/Ns) for individual spectra. Our approach i…
Long-term Monitoring of the Black Hole Candidate Swift J1753.5-0127 with INTEGRAL/SPI
Jourdain, E.; Roques, J. P.; Rodi, J.
The black hole candidate (BHC) Swift J1753.5-0127 went into outburst in 2005 June. Rather than fade into quiescence as most BHC transients do, it has remained in a low hard spectral state for most of the ∼9 years after its outburst. Its persistent emission during the hard state is reminiscent of the black hole Cyg X-1 and the BHCs 1E 1740.7-2942 a…