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Constraints on the Luminosity of the Central Source in SNR 1987A
Gilfanov, M. R.; Sunyaev, R. A.; Lutovinov, A. A. +1 more
We obtained constraints on the luminosity of the central source in SNR 1987 A using XMM-Newton and INTEGRAL data. XMM-Newton yields an upper limit on the SNR luminosity in the 2 10 keV energy band, L X ≲ 5 × 1034 erg s-1. Since the optical depth of the envelope is still large in the XMM-Newton energy band, this constraint carries no useful informa…
The Trail of Discrete X-Ray Sources in the Early-Type Galaxy NGC 4261: Anisotropy in the Globular Cluster Distribution?
Trinchieri, Ginevra; Wolter, Anna; Cortese, Luca +4 more
Chandra images of the elliptical galaxy NGC 4261 have revealed an anisotropy in the spatial distribution of the off-nuclear X-ray sources, interpreted by Zezas et al. as evidence of an association with a young stellar population. Our independent analysis of archive X-ray (Chandra) and optical (INT and HST) observations confirms the anisotropy of t…
<sl>Chandra</sl> and RXTE spectroscopy of the accreting msec pulsar IGR J00291+5934
Nowak, M. A.; Rodriguez, J.; Wilms, J. +4 more
We report on an observation of the recently discovered accreting millisecond X-ray pulsar IGR J00291+5934 performed with the RXTE-Proportional Counter Array (PCA) and <sl>Chandra</sl>-High Energy Transmission Grating Spectrometer (HETGS). The RXTE data are from a two-week follow-up of the source, while the <sl>Chandra</sl> …
The Nature of Radio Continuum Emission at Very Low Metallicity: Very Large Array Observations of I Zw 18
Cannon, John M.; Skillman, Evan D.; Walter, Fabian +1 more
We present the first resolved study of the radio continuum properties of I Zw 18, the dwarf galaxy with the lowest known nebular metal abundance in the local universe. New Very Large Array radio continuum images at 20 and 3.6 cm are compared to various Hubble Space Telescope images, and we find a striking morphological similarity between high-reso…
Small rampart craters in an equatorial region on Mars: Implications for near-surface water or ice
Jaumann, R.; Neukum, G.; Hauber, E. +3 more
Small onset diameters (1 km) of rampart craters were identified in High Resolution Stereo Camera (HRSC) imagery in the equatorial region of the Valles Marineris plateaus. This is in contrast to previous global studies based on Viking imagery, which showed onset diameters in the range of 4 km to 7 km in equatorial regions. The observed small rampar…
Asymmetrical structure of ionization and kinematics in the Seyfert galaxy NGC 5033
Battaner, E.; Arribas, S.; García-Lorenzo, B. +5 more
We present integral field spectroscopy of NGC 5033, a low luminosity Seyfert galaxy. The observations were made with INTEGRAL, a fiber based system operating at the WHT. The intensity map of the Hβ emission line represents a spiral or ring-like pattern of HII regions. On the contrary, the [OIII] intensity map morphology is markedly anisotropic. Th…
Galaxy populations of double cluster RX J1053.7+5735 at z = 1.13
Hasinger, G.; Schmidt, M.; Hashimoto, Yasuhiro +2 more
We present a study of the galaxy population in the cluster RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies and one which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hol…
Astrophysical laser operating in the OI 8446-Åline in the Weigelt blobs of η Carinae
Johansson, S.; Letokhov, V. S.
Within the framework of a simple model of photophysical processes in the Weigelt blobs in the vicinity of the luminous blue variable (LBV) star η Carinae, we explain the presence of the fluorescent <OI> 8446-Åand forbidden [OI] 6300-Ålines as well as the absence of the allowed OI 7774-Åline in spectra recorded with the Hubble Space Telescope…
Resolving the Shocks in Radio Galaxy Nebulae: Hubble Space Telescope and Radio Imaging of 3C 171, 3C 277.3, and PKS 2250-41
Koekemoer, Anton M.; Baum, Stefi A.; O'Dea, Christopher P. +5 more
We present the results of Hubble Space Telescope (HST) WFPC2 medium-band and narrowband imaging and Very Large Array and MERLIN2 radio imaging of three powerful radio galaxies: 3C 171, 3C 277.3, and PKS 2250-41. We obtained images of the rest frame [O III] λ5007 and [O II] λ3727 line emission using the linear ramp filters on WFPC2. The correlation…
INTEGRAL observations of the Be/X-ray binary EXO 2030+375 during outburst
Connell, P.; Beckmann, V.; Blay, P. +4 more
We present a type-I outburst of the high-mass X-ray binary EXO 2030+375, detected during INTEGRAL's Performance and Verification phase in December 2002 (on-source time about 106 s). In addition, six more outbursts have been observed during INTEGRAL's Galactic Plane Scans. X-ray pulsations have been detected with a pulse period of 41.691…