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On the multiwavelength spectrum of the microquasar 1E 1740.7-2942
Bassani, L.; Bazzano, A.; Del Santo, M. +3 more
Context: .The microquasar 1E 1740.7-2942 is a source located in the direction of the Galactic Center. It has been detected at X-rays, soft gamma-rays, and in the radio band, showing an extended radio component in the form of a double-sided jet. Although no optical counterpart has been found so far for 1E 1740.7-2942, its X-ray activity strongly po…
Planetary nebula candidates in extragalactic young star clusters
Larsen, S. S.; Richtler, T.
Context: .During an analysis of optical spectra of 80 young star clusters in several nearby spiral galaxies, [O III] and [N II] emission lines were noted in some cases. Three of these emission line sources are associated with clusters older than 30 Myr, and are identified as likely planetary nebula (PN) candidates.
Aims: .These objects may re…
Properties and nature of Be stars. 24. Better data and model for the Be+F binary V360 Lacertae
Wolf, M.; Harmanec, P.; Yang, S. +10 more
Aims.We include existing photometric and spectroscopic material with new observations in a detailed study of the Be+F binary
Methods: .We used the programs FOTEL and KOREL to derive an improved linear ephemeris and to disentangle the line profiles of both binary components and telluric lines. The BINSYN software su…
Recent star formation in the inner Galactic Bulge seen by ISOGAL. I. Classification of bright mid-IR sources in a test field
Price, S. D.; Glass, I. S.; Omont, A. +3 more
Context.The stellar populations in the central region of the Galaxy are poorly known because of the high visual extinction and very great source density in this direction.
Aims.To use recent infrared surveys for studying the dusty stellar objects in this region.
Methods.We analyse the content of a ∼20×20 arcmin2 field centred at (…
XMM-Newton and ESO observations of the two unidentified γ-ray sources 3EG J0616-3310 and 3EG J1249-8330
Bignami, G. F.; Schirmer, M.; Hatziminaoglou, E. +3 more
The limited angular resolution of γ-ray telescopes prevents a direct identification of the majority of sources detected so far. This is particularly true for the low latitude, probably galactic, ones only 10% of which has been identified. Most counterparts of the identified low-latitude γ-ray sources are Isolated Neutron Stars (INS), both radio-lo…
The first brown dwarf with a disk in Chamaeleon II
Alcalá, J. M.; Frasca, A.; Merín, B. +4 more
In this letter we characterize the candidates for young stars and brown dwarfs detected in a survey with ISOCAM in the Chamaeleon II dark cloud. Photometric data coming from a wide-field optical imaging survey, combined with IR measurements from the 2MASS catalogue and from the Spitzer satellite, allow us to study the nature of the candidates. Usi…
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…
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…
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…
Searching for X-ray luminous "normal" galaxies in 2dFGRS
Georgakakis, A.; Georgantopoulos, I.; Tzanavaris, P.
Aims.We cross-correlated the Chandra XASSIST and XMM-Newton Serendipitous Source Catalogues with the 2 degree Field Galaxy Redshift Survey (2dFGRS) database. Our aim was to identify the most X-ray luminous (LX > 1042 erg s-1) examples of galaxies in the local Universe whose X-ray emission is dominated by stellar…