Search Publications
Physical Properties and Morphology of a Newly Identified Compact z = 4.04 Lensed Submillimeter Galaxy in Abell 2218
Richard, Johan; Kneib, Jean-Paul; Egami, Eiichi +2 more
We present the identification of a bright submillimeter (submm) source, SMM J163555.5+661300, detected in the lensing cluster Abell 2218, for which we have accurately determined the position using observations from the Submillimeter Array (SMA). The identified optical counterpart has a spectroscopic redshift of z = 4.044 ± 0.001 if we attribute th…
Space Velocities of Southern Globular Clusters. VI. Nine Clusters in the Inner Milky Way
Casetti-Dinescu, Dana I.; Girard, Terrence M.; Korchagin, Vladimir I. +2 more
We have measured the absolute proper motions of nine low-latitude, inner Galaxy globular clusters, namely, NGC 6273 (M 19), NGC 6284, NGC 6287, NGC 6293, NGC 6333 (M 9), NGC 6342, NGC 6356, NGC 6388, and NGC 6441. These are the first determinations ever made for these clusters. The proper motions are on the International Celestial Reference System…
The evolutionary sequence of submillimetre galaxies: from diffuse discs to massive compact ellipticals?
Conselice, C. J.; Buitrago, F.; Ricciardelli, E. +1 more
The population of compact massive galaxies observed at z > 1 is hypothesized, both observationally and in simulations, to be merger remnants of gas-rich disc galaxies. To probe such a scenario, we analyse a sample of 12 gas-rich and active star-forming submillimetre galaxies (SMGs) at 1.8 < z < 3. We present a structural and size measurem…
Intermittency and Multifractality Spectra of the Magnetic Field in Solar Active Regions
Yurchyshyn, Vasyl; Abramenko, Valentyna
We present the results of a study of intermittency and multifractality of magnetic structures in solar active regions (ARs). Line-of-sight magnetograms for 214 ARs of different flare productivity observed at the center of the solar disk from 1997 January until 2006 December are utilized. Data from the Michelson Doppler Imager (MDI) instrument on b…
Resolving the cold debris disc around a planet-hosting star . PACS photometric imaging observations of q1 Eridani (HD 10647, HR 506)
Heras, A. M.; Olofsson, G.; Krivov, A. V. +32 more
Context. About two dozen exo-solar debris systems have been spatially resolved. These debris discs commonly display a variety of structural features such as clumps, rings, belts, excentric distributions and spiral patterns. In most cases, these features are believed to be formed, shaped and maintained by the dynamical influence of planets orbiting…
Magnetic structures of an emerging flux region in the solar photosphere and chromosphere
Solanki, S. K.; Lagg, A.; Xu, Z.
Aims: We investigate the vector magnetic field and Doppler velocity in the photosphere and upper chromosphere of a young emerging flux region of the sun close to disk center.
Methods: Spectropolarimetric scans of a young active region made using the second generation Tenerife Infrared Polarimeter (TIP II) on the German Vacuum Tower Teles…
HD/H2 molecular clouds in the early Universe: The problem of primordial deuterium
Balashev, S. A.; Ivanchik, A. V.; Varshalovich, D. A.
We have detected new HD absorption systems at high redshifts, z abs = 2.626 and z abs = 1.777, identified in the spectra of the quasars J0812+3208 and Q1331+170, respectively. Each of these systems consists of two subsystems. The HD column densities have been determined: log N {HD/A} = 15.70 ± 0.07 for z…
Discovery of a Highly Energetic Pulsar Associated with IGR J14003-6326 in the Young Uncataloged Galactic Supernova Remnant G310.6-1.6
Tomsick, J. A.; Rodriguez, J.; Gotthelf, E. V. +6 more
We report the discovery of 31.18 ms pulsations from the INTEGRAL source IGR J14003-6326 using the Rossi X-ray Timing Explorer (RXTE). This pulsar is most likely associated with the bright Chandra X-ray point source lying at the center of G310.6-1.6, a previously unrecognized Galactic composite supernova remnant (SNR) with a bright central non-ther…
Transiting exoplanets from the CoRoT space mission . XIII. CoRoT-13b: a dense hot Jupiter in transit around a star with solar metallicity and super-solar lithium content
Mazeh, T.; Aigrain, S.; Alonso, R. +45 more
We announce the discovery of the transiting planet CoRoT-13b. Ground-based follow-up in CFHT and IAC80 confirmed CoRoT's observations. The mass of the planet was measured with the HARPS spectrograph and the properties of the host star were obtained analyzing HIRES spectra from the Keck telescope. It is a hot Jupiter-like planet with an orbital per…
Multi-Epoch Hubble Space Telescope Observations of IZw18: Characterization of Variable Stars at Ultra-Low Metallicities
Saha, A.; Tosi, M.; Clementini, G. +7 more
Variable stars have been identified for the first time in the very metal-poor blue compact dwarf galaxy IZw18, using deep multi-band (F606W, F814W) time-series photometry obtained with the Advanced Camera for Surveys on board the Hubble Space Telescope. We detected 34 candidate variable stars in the galaxy. We classify three of them as Classical C…