Search Publications
Mid-infrared interferometric variability of DG Tauri : Implications for the inner-disk structure
Jaffe, W.; Ábrahám, P.; Chen, L. +12 more
Context. DG Tau is a low-mass pre-main sequence star, whose strongly accreting protoplanetary disk exhibits a so-far enigmatic behavior: its mid-infrared thermal emission is strongly time-variable, even turning the 10 µm silicate feature from emission to absorption temporarily.
Aims: We look for the reason for the spectral variability a…
The XXL survey: First results and future
Smith, G. P.; Okabe, N.; Chiappetti, L. +108 more
The XXL survey currently covers two 25 deg2 patches with XMM observations of ∼10 ks. We summarize the scientific results associated with the first release of the XXL dataset, which occurred in mid-2016. We review several arguments for increasing the survey depth to 40 ks during the next decade of XMM operations. X-ray (z < 2) cluster…
Testing the Universality of the Stellar IMF with Chandra and HST
Lehmer, B. D.; Hornschemeier, A. E.; Maccarone, T. +8 more
The stellar initial mass function (IMF), which is often assumed to be universal across unresolved stellar populations, has recently been suggested to be “bottom-heavy” for massive ellipticals. In these galaxies, the prevalence of gravity-sensitive absorption lines (e.g., Na I and Ca II) in their near-IR spectra implies an excess of low-mass (m≲ 0.…
The intricate Galaxy disk: velocity asymmetries in Gaia-TGAS
Prusti, T.; Figueras, F.; Antoja, T. +3 more
We use Gaia-TGAS data to compare the transverse velocities in Galactic longitude (coming from proper motions and parallaxes) in the Milky Way disk for negative and positive longitudes as a function of distance. The transverse velocities are strongly asymmetric and deviate significantly from the expectations for an axisymmetric galaxy. The value an…
A systematic analysis of the XMM-Newton background: III. Impact of the magnetospheric environment
Tiengo, Andrea; De Luca, Andrea; Marelli, Martino +6 more
A detailed characterization of the particle induced background is fundamental for many of the scientific objectives of the Athena X-ray telescope, thus an adequate knowledge of the background that will be encountered by Athena is desirable. Current X-ray telescopes have shown that the intensity of the particle induced background can be highly vari…
Radio and infrared study of the star-forming region IRAS 20286+4105
Ojha, D. K.; Vig, S.; Ghosh, S. K. +3 more
In this paper, we present a multiwavelength investigation of the star-forming complex IRAS 20286+4105, located in the Cygnus X region. Near-infrared K-band data are used to revisit the cluster/stellar group identified in previous studies. Radio continuum observations at 610 and 1280 MHz show the presence of a H II region possibly powered by a star…
Type I X-ray Bursts Detected by the JEM-X Telescope Onboard the INTEGRAL Observatory in 2003-2015
Grebenev, S. A.; Mereminskiy, I. A.; Chelovekov, I. V. +1 more
We present the results of our analysis of the JEM-X/INTEGRAL data obtained from January 2003 to January 2015 aimed at searching for type I X-ray bursts from known and new bursters. Such bursts are caused by thermonuclear explosions on the surface of a neutron star. We have searched for bursts in the records of the count rate of the JEM-X detectors…
Follow-up observations for the Asteroid Catalog using AKARI Spectroscopic Observations
Hasegawa, Sunao; Usui, Fumihiko; Yanagisawa, Kenshi +1 more
In the 1-2.5 µm range, spectroscopic observations are made on the AcuA-spec asteroids, the spectra of which were obtained in a continuous covered mode between 2.5-5.0 µm by AKARI. Based on the Bus-DeMeo taxonomy (DeMeo et al. 2009, Icarus, 202, 160), all the AcuA-spec asteroids are classified, using both published and our observational…
Gas kinematics in the H II regions G351.69-1.15 and G351.63-1.25
Vig, S.; Ghosh, S. K.; Veena, V. S. +2 more
We probe the structure and kinematics of two neighbouring H II regions identified as cometary and bipolar, using radio recombination lines (RRLs). The H172α RRLs from these H II regions: G351.69-1.15 and G351.63-1.25, are mapped using Giant Metrewave Radio Telescope, India. We also detect carbon RRLs C172α towards both these regions. The hydrogen …
Star Formation in the Cluster Merger DLSCL J0916.2+2953
Dawson, W. A.; Lemaux, B. C.; Wittman, D. +3 more
We investigate star formation in DLSCL J0916.2+2953, a dissociative merger of two clusters at z = 0.53 that has progressed {1.1}-0.4+1.3 Gyr since the first pass-through. We attempt to reveal the effects a collision may have had on the evolution of the cluster galaxies by tracing their star formation history. We probe current…