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Serendipitous XMM-Newton Discovery of a Cluster of Galaxies at z = 0.28
Barth, Aaron J.; Humphrey, Philip J.; Buote, David A. +5 more
We report the discovery of a galaxy cluster serendipitously detected as an extended X-ray source in an offset observation of the group NGC 5044. The cluster redshift, z=0.281, determined from the optical spectrum of the brightest cluster galaxy, agrees with that inferred from the X-ray spectrum using the Fe Kα complex of the hot ICM (z=0.27+/-0.01…
Deep Hubble space telescope ultraviolet imaging of the M87 jet
Perlman, Eric S.; Sparks, William B.; Harris, D. E. +3 more
Near-ultraviolet imaging with HST offers the best possible spatial resolution currently available for optical/UV astronomical imaging. The giant elliptical galaxy M87 hosts one of the most spectacular, best studied and nearest (d=16 Mpc) galactic-scale relativistic (synchrotron emitting plasma) jets. We have extracted from the HST archive all 220 …
Titan: Atmospheric and surface features as observed with Nasmyth Adaptive Optics System Near-Infrared Imager and Spectrograph at the time of the Huygens mission
Drossart, P.; Gendron, E.; Rannou, P. +5 more
At the time of the Huygens probe descent in Titan's atmosphere, on 14 January 2005, many ground-based telescopes were pointed toward Saturn's satellite. Here, we describe the data collected on 15 and 16 January with Nasmyth Adaptive Optics System Near-Infrared Imager and Spectrograph (NACO) at the Very Large Telescope. We acquired adaptive optics …
On periodicities in long term climatic variations near 68° N, 30° E
Kasatkina, E. A.; Shumilov, O. I.; Krapiec, M.
It is generally believed that the low-frequency variability of climatic parameters seems to be connected to solar cycles. The principal periodicities are: 11-year (Schwabe), 22-year (Hale), 33-year (Bruckner) and 80-100-year (Gleissberg) cycles. The main heliophysical factors acting on climate, the biosphere and the atmosphere are solar irradiance…
High resolution imaging of the early-type galaxy NGC 1380: an insight into the nature of extended extragalactic star clusters
Santiago, B. X.; Pastoriza, M. G.; Chies-Santos, A. L.
Context: NGC 1380 is a lenticular galaxy located near the centre of the Fornax Cluster, northeast of NGC 1399. The globular cluster system of this galaxy has hitherto only been studied from the ground. Recent studies of similar early-type galaxies, specially lenticular ones, reveal the existence of star clusters that apparently break up the tradit…
A low mass cluster of extremely red galaxies at z = 1.10 in the GOODS Southern Field
Rebolo, Rafael; Díaz-Sánchez, Anastasio; Pérez-Garrido, Antonio +1 more
We have studied the spatial clustering of high redshift (z > 1) extremely red objects (EROs) as a function of photometric redshift in the GOODS Southern Field using public data. A remarkable overdensity of extremely red galaxies (I - Ks > 4) is found at an average photometric redshift zphot = 1.10. Nine objects (six are…
Constituents of the soft X-ray background
Sołtan, A. M.
Context: The X-ray background (XRB) is generated by various classes of objects and a variety of emission mechanisms. Relative contribution of individual components depends on energy.
Aims: The goal is to assess the integral emission of the major components of the soft XRB (extragalactic discrete sources dominated by active galactic nuclei (AGN…
A direct and differential imaging search for sub-stellar companions to ɛ Indi A
Henning, T.; Kürster, M.; Brandner, W. +7 more
We have carried out a direct and differential imaging search for sub-stellar companions to
INTEGRAL high-energy monitoring of the X-ray burster KS 1741-293
Ubertini, P.; Bazzano, A.; De Cesare, G. +4 more
KS 1741-293, discovered in 1989 by the X-ray camera TTM on the Kvant module of the Mir space station and identified as an X-ray burster, had not been detected in the hard X-ray band until the advent of the INTEGRAL observatory. Moreover, this source has recently been the object of scientific discussion, being also associated with a nearby extended…
A deep XMM-Newton X-ray observation of the Chamaeleon I dark cloud
Schmitt, J. H. M. M.; Robrade, J.
Context: Low-mass stars are known to exhibit strong X-ray emission during the early stages of evolution. Nearby star forming regions are ideal targets to study the X-ray properties of pre-main sequence stars.
Aims: A deep XMM-Newton exposure is used to investigate X-ray properties of the pre-main sequence population of the Chamaeleon I star fo…