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Condensate clouds in Titan's north polar stratosphere
Samuelson, Robert E.; Mayo, Louis A.
Analysis of the 250-560 cm -1 spectral continuum of Titan's north polar hood just after spring equinox reveals, in addition to the ubiquitous aerosol, a tenuous but relatively uniform cloud of small particles permeating the lower stratosphere at altitudes between 58 and 90 km. Voyager 1 IRIS data suggest the particles are highly scatter…
3-200 keV Spectral States and Variability of the INTEGRAL Black Hole Binary IGR J17464-3213
Capitanio, F.; Bird, A. J.; Ubertini, P. +12 more
On March 2003, IBIS, the gamma-ray imager on board the INTEGRAL satellite, detected an outburst from a new source, IGR J17464-3213, that turned out to be a HEAO 1 transient, H1743-322. In this paper we report on the high-energy behavior of this black hole candidate (BHC) studied with the three main instruments on board INTEGRAL. The data, collecte…
The opacity of spiral galaxy disks. VI. Extinction, stellar light and color
Holwerda, B. W.; Allen, R. J.; van der Kruit, P. C. +1 more
In this paper we explore the relation between dust extinction and stellar light distribution in disks of spiral galaxies. Extinction influences our dynamical and photometric perception of disks, since it can distort our measurement of the contribution of the stellar component. To characterize the total extinction by a foreground disk, González et …
Plasmoid in the high latitude boundary/cusp region observed by Cluster
Balogh, A.; Glassmeier, K. -H.; Zhang, H. +8 more
A plasmoid-like structure without a core magnetic field has been observed by Cluster spacecraft in the high latitude magnetopause region when the interplanetary magnetic field (IMF) is northward and has a dominant duskward component. Bursty electrons and ions are found to be well confined in this plasmoid-like structure. The structure possesses a …
INTEGRAL high energy observations of 2S 0114+65
Bonning, E. W.; Falanga, M.
We report the first INTEGRAL timing and spectral analysis of the high mass X-ray binary source 2S 0114+65 at high energies (5-100 keV). The pulse period was found at 2.668 h with a high pulsed fraction, 80% in both the 20-40 keV and 40-80 keV energy bands. The spin-up trend over 8 years was measured to be dot P = -8.9 × 10-7 s s-1<…
Evidence of an Untruncated Accretion Disk in the Broad-Line Radio Galaxy 4C 74.26
Fabian, A. C.; Ballantyne, D. R.
We present evidence of a broad ionized Fe Kα line in the XMM-Newton spectrum of the broad-line radio galaxy (BLRG) 4C 74.26. This is the first indication that the innermost regions of the accretion flow in BLRGs contain thin, radiatively efficient disks. Analysis of the 35 ks XMM-Newton observation finds a broad line with an inner radius close to …
Looking for obscured QSOs in the X-ray emitting ERO population
Braito, V.; Mannucci, F.; Bender, R. +8 more
We present XMM-Newton data centered on one of the MUNICS Near Infrared Cluster Survey fields (S2F1) and we discuss the X-ray properties of the 6 X-ray emitting EROs found. For one of them we have already obtained the redshift using near-infrared spectroscopic data, while for the remaining 5 EROs the analysis is based on photometric redshifts. We f…
A Redshift z ~ 5.4 Lyα Emitting Galaxy with Linear Morphology in the GRAPES/Hubble Ultra Deep Field
Gardner, Jonathan P.; Stiavelli, Massimo; Daddi, Emanuele +21 more
We have discovered an extended Lyα plume (UDF 5225) associated with a compact source at redshift z~5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Science (GRAPES) project. The spatial extent of the emission is about 6×1.5 kpc (1''×0.25"). Combining our grism data and the broadband images from the Hubble …
M74 X-1 (CXOU J013651.1+154547): An Extremely Variable Ultraluminous X-Ray Source
Roberts, T. P.; Krauss, M. I.; Kilgard, R. E. +2 more
Ultraluminous X-ray sources (ULXs) have been described variously as the most luminous normal X-ray binaries, hypernovae, and ``intermediate-mass'' black holes with masses of hundreds to thousands of solar masses. We present results on M74 X-1 (CXOU J013651.1+154547), a ULX in the nearby spiral galaxy M74 (NGC 628), from observations by Chandra and…
The High-Energy Spectrum of NGC 4151
Gehrels, N.; Petrucci, P. -O.; Shrader, C. R. +5 more
We present the first INTEGRAL observations of the type 1.5 Seyfert galaxy NGC 4151. Combining several INTEGRAL observations performed during 2003, totaling ~400 ks of exposure time, allows us to study the spectrum in the 2-300 keV range. The measurements presented here reveal an overall spectrum from X-rays up to soft gamma-rays that can be descri…