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Morphology of galaxies in the Coma cluster region down to M_B = -14.25. I. A catalog of 473 members
Andreon, S.; Michard, R.
This paper presents morphological type, membership, and U{-}V color for a sample of galaxies in the Coma cluster direction, complete down to M_B=-15.00 mag and extending down to M_B=-14.25 mag. We have examined 1155 objects from the GMP 1983 catalog on B and V images of the CFH12K camera, and obtained the Hubble type in most cases. Coma cluster me…
Peering through the stellar wind of IGR J19140+0951 with simultaneous INTEGRAL/RXTE observations
Rodriguez, J.; Shaw, S. E.; Hannikainen, D. C. +1 more
We have used the RXTE and INTEGRAL satellites simultaneously to observe the high-mass X-ray binary (HMXB) IGR J19140+0951. The spectra obtained in the 3-80 keV range have allowed us to perform a precise spectral analysis of the system along its binary orbit. The spectral evolution confirms the supergiant nature of the companion star and the neutro…
The Planetary Nebula NGC 1360: A Test Case of Magnetic Collimation and Evolution after the Fast Wind
López, J. A.; Steffen, W.; García-Segura, G. +2 more
The central star of this nebula has an observed intense magnetic field and the fast wind is no longer present, indicating that a back flow process has probably developed. Long-slit, spatially resolved echelle spectra have been obtained across the main body of NGC 1360 and over its system of bipolar jets. Deep images of the knotty structures of the…
NGC 300 X-1 and IC 10 X-1: a new breed of black hole binary?
Barnard, R.; Clark, J. S.; Kolb, U. C.
Context: IC 10 X-1 has recently been confirmed as a black hole (BH) + Wolf-Rayet (WR) X-ray binary, and NGC 300 X-1 is thought to be. The only other known BH+WR candidate is Cygnus X-3. IC 10 X-1 and NGC 300 X-1 have similar X-ray properties, with 0.3-10 keV luminosities ~1038 erg s-1, and their X-ray lightcurves exhibit orbi…
Cassini encounters with hot flow anomaly-like phenomena at Saturn's bow shock
Coates, A. J.; Dougherty, M. K.; Thomsen, M. F. +7 more
The first observations of the kronian equivalent of hot flow anomalies (HFAs) are presented. Using magnetic field and plasma data we discuss two events that were observed upstream of Saturn's bow shock during the first two orbits of the Cassini spacecraft. We suggest that these events result from the interaction between interplanetary current shee…
X-ray absorption in distant type II QSOs
Barcons, X.; Carrera, F. J.; Watson, M. G. +7 more
Aims: We present the results of the X-ray spectral analysis of an XMM-Newton-selected type II QSO sample with z ≥ 0.5 and 0.5-10 keV flux of 0.3-33×10-14 erg/s/cm^2. The distribution of absorbing column densities in type II QSOs is investigated and the dependence of absorption on X-ray luminosity and redshift is studied.
Methods: We…
High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FUOri disc
Apai, D.; Ábrahám, P.; Kóspál, Á. +6 more
We present the first high spatial resolution near-infrared direct and polarimetric observations of Parsamian 21, obtained with the Nasmyth Adaptive Optics System-CONICA instrument at the Very Large Telescope (VLT). We complemented these measurements with archival infrared observations, such as Hubble Space Telescope (HST)/Wide Field Planetary Came…
The Blue Straggler Population in the Globular Cluster M53 (NGC 5024): A Combined HST, LBT, and CFHT Study
Pasian, F.; Fontana, A.; Grazian, A. +24 more
We used a proper combination of high-resolution and wide-field multiwavelength observations collected at three different telescopes (HST, LBT, and CFHT) to probe the blue straggler star (BSS) population in the globular cluster M53. Almost 200 BSSs have been identified over the entire cluster extension. The radial distribution of these stars has be…
Tailward flow of energetic neutral atoms observed at Mars
Kallio, E.; Barabash, S.; Holmström, M. +7 more
The ASPERA-3 experiment on Mars Express provides the first measurements of energetic neutral atoms (ENAs) from Mars. These measurements are used to study the global structure of the interaction of the solar wind with the Martian atmosphere. In this study we describe the tailward ENA flow observed at the nightside of Mars. After characterizing ener…
Understanding the global evolution of Saturn's ring current
Krimigis, S. M.; Mitchell, D. G.; Carbary, J. F. +3 more
An explanation for the morphology and evolution of the ring current in Saturn's magnetosphere is provided. We use global Energetic Neutral Atom (ENA) images of the 20-140 keV proton distribution obtained by the Ion and Neutral Camera (INCA) on board the Cassini spacecraft. A case where the ring current displays an exceptionally clear spiral shape …