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Traveling Convective Modes in the Sun's Subsurface Shear Layer
Kosovichev, A. G.; Green, C. A.
Observations reveal that supergranular convective cells on the Sun rotate faster than the plasma on the solar surface. Recent time-distance helioseismology results from the Solar and Heliospheric Observatory Michelson Doppler Imager suggest that supergranulation has properties of traveling waves. We consider the idea that these properties are rela…
Keck Spectroscopy of Globular Clusters in the Virgo Cluster Dwarf Elliptical Galaxy VCC 1386
Conselice, Christopher J.
We present the results of a Keck spectroscopic study of globular clusters associated with the Virgo Cluster dwarf elliptical galaxy (dE) VCC 1386. We analyze blue spectroscopic absorption lines from 3500 to 5500 Å for 13 globular cluster candidates and confirm that five are associated with VCC 1386. By comparing metal and Balmer line indices of th…
The properties of the circumnuclear regions in the Circinus galaxy
Bianchi, S.; Matt, G.; Nicastro, F. +2 more
We analysed the spectra from the XMM-Newton and the three longest Chandra observations of the Circinus Galaxy, the X-ray brightest, Compton-thick Seyfert 2 galaxy, to derive the physical and morphological parameters of the circumnuclear matter. We compare the line and continuum parameters with extensive calculations performed with the well-known p…
Imprints of Environment on Cluster and Field Late-Type Galaxies at z~1
Ford, H. C.; Demarco, R.; Menanteau, F. +6 more
We present a comparison of late-type galaxies (Sa and later) in intermediate-redshift clusters and in the field using images from the Advanced Camera for Surveys aboard the Hubble Space Telescope. Cluster and field galaxies are selected by matching photometric and spectroscopic catalogs of four cluster fields: Cl 0152-1357, Cl 1056-0337 (MS 1054),…
The Serendipitous XMM-Newton Cluster Athens Survey (SEXCLAS): sample selection and the cluster logN-logS
Georgakakis, A.; Georgantopoulos, I.; Plionis, M. +4 more
In this paper we serendipitously identify X-ray cluster candidates using XMM-Newton archival observations complemented by five-band optical photometric follow-up observations (r~ 23 mag) as part of the X-ray Identification (XID) programme. Our sample covers an area of ~2.1 deg2 (15 XMM-Newton fields) and comprises a total of 21 (19 sere…
Coordinated observation of field line resonance in the mid-tail
Russell, C. T.; Balogh, A.; Rème, H. +9 more
Standing Alfvén waves of 1.1 mHz (~15 min in period) were observed by the Cluster satellites in the mid-tail during 06:00-07:00 UT on 8 August 2003. Pulsations with the same frequency were also observed at several ground stations near Cluster's footpoint. The standing wave properties were determined from the electric and magnetic field measurement…
Bright X-Ray Transients in M31: 2004 July XMM-Newton Observations
Trudolyubov, Sergey; Priedhorsky, William; Cordova, France
We present the results of X-ray observations of four bright transients sources detected in the 2004 July XMM-Newton observations of the central bulge of M31. Two X-ray sources, XMMU J004315.5+412440 and XMMU J004144.7+411110, were discovered for the first time. Two other sources, CXOM31 J004309.9+412332 and CXOM31 J004241.8+411635, were previously…
The CdC2000 Bordeaux Carte du Ciel catalogue (+11° ≤ δ ≤ +18°)
Ducourant, C.; Soubiran, C.; Teixeira, R. +9 more
Context: .This work is part of a program of proper motion measurements in the Bordeaux Carte du Ciel zone.Aims.We present the CdC2000 catalogue issued from the reduction of the complete Bordeaux Carte du Ciel zone observed at the begining of last century with the Bordeaux astrograph.Methods.Plates have been individually reduced using the TYCHO-2 C…
Extreme solar EUV flares and ICMEs and resultant extreme ionospheric effects: Comparison of the Halloween 2003 and the Bastille Day events
Tsurutani, B. T.; Verkhoglyadova, O. P.; Judge, D. L. +9 more
Extreme solar flares can cause extreme ionospheric effects. The 28 October 2003 flare caused a ~25 total electron content units (TECU = 1016 el/m2 column density), or a ~30%, increase in the local noon equatorial ionospheric column density. The rise in the TEC enhancement occurred in ~5 min. This TEC increase was ~5 times the…
Optical identification of IGR J19140+0951
O'Brien, K.; in't Zand, J. J. M.; Nelemans, G. +2 more
IGR J19140+0951 was discovered by INTEGRAL in 2003 in the 4-100 keV band. Observations with INTEGRAL and RXTE provide a tentative identification as a high-mass X-ray binary (HMXB) with a neutron star as accretor. However, an optical counterpart was thus far not established, nor was the presence of a pulsar which is commonly observed in HMXBs. We o…