Search Publications
Looking for obscured QSOs in the X-ray emitting ERO population
Braito, V.; Mannucci, F.; Bender, R. +8 more
We present XMM-Newton data centered on one of the MUNICS Near Infrared Cluster Survey fields (S2F1) and we discuss the X-ray properties of the 6 X-ray emitting EROs found. For one of them we have already obtained the redshift using near-infrared spectroscopic data, while for the remaining 5 EROs the analysis is based on photometric redshifts. We f…
A Redshift z ~ 5.4 Lyα Emitting Galaxy with Linear Morphology in the GRAPES/Hubble Ultra Deep Field
Gardner, Jonathan P.; Stiavelli, Massimo; Daddi, Emanuele +21 more
We have discovered an extended Lyα plume (UDF 5225) associated with a compact source at redshift z~5.4 in slitless spectroscopic data from the Grism ACS Program for Extragalactic Science (GRAPES) project. The spatial extent of the emission is about 6×1.5 kpc (1''×0.25"). Combining our grism data and the broadband images from the Hubble …
M74 X-1 (CXOU J013651.1+154547): An Extremely Variable Ultraluminous X-Ray Source
Roberts, T. P.; Krauss, M. I.; Kilgard, R. E. +2 more
Ultraluminous X-ray sources (ULXs) have been described variously as the most luminous normal X-ray binaries, hypernovae, and ``intermediate-mass'' black holes with masses of hundreds to thousands of solar masses. We present results on M74 X-1 (CXOU J013651.1+154547), a ULX in the nearby spiral galaxy M74 (NGC 628), from observations by Chandra and…
The High-Energy Spectrum of NGC 4151
Gehrels, N.; Petrucci, P. -O.; Shrader, C. R. +5 more
We present the first INTEGRAL observations of the type 1.5 Seyfert galaxy NGC 4151. Combining several INTEGRAL observations performed during 2003, totaling ~400 ks of exposure time, allows us to study the spectrum in the 2-300 keV range. The measurements presented here reveal an overall spectrum from X-rays up to soft gamma-rays that can be descri…
Final analysis of ELAIS 15-µm observations: method, reduction and catalogue
Aussel, H.; Pozzi, F.; Franceschini, A. +15 more
We present the final analysis of the European Large Area Infrared Space Observatory (ISO) Survey (ELAIS) 15-µm observations, carried out with the ISO Camera (ISOCAM) instrument on board the ISO.
The data-reduction method, known as the Lari Method, is based on a mathematical model of the behaviour of the detector and was specifically des…Unveiling the nature of the high energy source IGRJ19140+0951
Rodriguez, J.; Schultz, J.; Beckmann, V. +3 more
We report on high energy observations of IGR J19140+0951 performed with RXTE on three occasions in 2002, 2003 and 2004, and INTEGRAL during a very well sampled and unprecedented high energy coverage of this source from early-March to mid-May 2003. Our analysis shows that IGR J19140+0951 spends most of its time in a very low luminosity state, proba…
Constraints on the star formation history of the Large Magellanic Cloud
Santiago, B. X.; Kerber, L. O.; Javiel, S. C.
We present the analysis of deep colour-magnitude diagrams (CMDs) of 6 stellar fields in the LMC. The data were obtained using HST/WFPC2 in the F814W (∼I) and F555W (∼V) filters, reaching V555 ∼ 26.5. We discuss and apply a method of correcting CMDs for photometric incompleteness. A method to generate artificial CMDs based on a model sta…
Infrared mergers and infrared quasi-stellar objects with galactic winds - III. Mrk 231: an exploding young quasi-stellar object with composite outflow/broad absorption lines (and multiple expanding superbubbles)
Zheng, W.; Terlevich, R.; Lípari, S. +3 more
We present a study of outflow (OF) and broad absorption line (BAL) systems in Mrk 231, and in similar infrared (IR) quasi-stellar objects (QSOs). This study is based mainly on one-dimensional and two-dimensional spectroscopy (obtained at La Palma/William Herschel Telescope, Hubble Space Telescope, International Ultraviolet Explorer, European South…
Coronal Mass Ejections and Galactic Cosmic-Ray Modulation
Gopalswamy, N.; Yashiro, S.; Lara, A. +3 more
We present a study of the long-term evolution of coronal mass ejections (CMEs) observed by the Large Angle and Spectrometric Coronograph (LASCO) on board SOHO during the ascending, maximum, and part of the descending phases of solar cycle 23 and their relation with the modulation of galactic cosmic-ray (GCR) intensity observed at 1 AU by the Clima…
Carbon monoxide fluorescence from Titan's atmosphere
Lellouch, E.; López-Valverde, M. A.; Coustenis, A.
We report on the discovery of emissions due to carbon monoxide from Titan's atmosphere, from mid-infrared observations with the ISAAC spectrometer at the Very Large Telescope and covering the 4.50-4.85 µm range. We detected about 45 emission lines coinciding with CO ro-vibrational lines, including CO(1-0) (P18 to R11) and CO(2-1) (P11 to R11…