Search Publications
Discovery of Fe Kα X-Ray Reverberation around the Black Holes in MCG-5-23-16 and NGC 7314
Fabian, A. C.; Miniutti, G.; Cackett, E. M. +3 more
Several X-ray observations have recently revealed the presence of reverberation time delays between spectral components in active galactic nuclei. Most of the observed lags are between the power-law Comptonization component, seen directly, and the soft excess produced by reflection in the vicinity of the black hole. NGC 4151 was the first object t…
Mapping H-band Scattered Light Emission in the Mysterious SR21 Transitional Disk
Henning, Thomas; Terada, Hiroshi; Usuda, Tomonori +50 more
We present the first near infrared (NIR) spatially resolved images of the circumstellar transitional disk around SR21. These images were obtained with the Subaru HiCIAO camera, adaptive optics, and the polarized differential imaging technique. We resolve the disk in scattered light at H-band for stellocentric 0.''1 <= r <= 0.''6 (12 <~ r …
A global topographic map of Titan
Barnes, Jason W.; Stiles, Bryan W.; Kirk, Randolph L. +8 more
Cassini RADAR SARtopo and altimetry data are used to construct a global gridded 1 × 1° elevation map, for use in Global Circulation Models, hydrological models and correlative studies. The data are sparse, and so most of the map domain (∼90%) is populated with interpolated values using a spline algorithm. The highest (∼+520 m) gridded point observ…
Three-Dimensional Evolution of Erupted Flux Ropes from the Sun (2 - 20 R ⊙) to 1 AU
Kilpua, E. K. J.; Vourlidas, A.; Isavnin, A.
Studying the evolution of magnetic clouds entrained in coronal mass ejections using in-situ data is a difficult task, since only a limited number of observational points is available at large heliocentric distances. Remote sensing observations can, however, provide important information for events close to the Sun. In this work we estimate the flu…
The ATLAS3D Project - XXIII. Angular momentum and nuclear surface brightness profiles
Krajnović, Davor; Emsellem, Eric; Sarzi, Marc +22 more
We investigate nuclear light profiles in 135 ATLAS3D galaxies for which the Hubble Space Telescope (HST) imaging is available and compare them to the large-scale kinematics obtained with the SAURON integral-field spectrograph. Specific angular momentum, λR, correlates with the shape of nuclear light profiles, where, as sugges…
Focusing on warm dark matter with lensed high-redshift galaxies.
Pacucci, F.; Mesinger, A.; Haiman, Z.
We propose a novel use of high-redshift galaxies, discovered in deep Hubble Space Telescope (HST) fields around strong lensing clusters. These fields probe small comoving volumes (∼103 Mpc3) at high magnification (µ ≳ 10) and can detect otherwise inaccessible ultra-faint galaxies. Even a few galaxies found in such small…
Rotation in NGC 2264: a study based on CoRoT photometric observations
Bouvier, J.; Micela, G.; Favata, F. +2 more
Rotation is one of the key stellar parameters which undergo substantial evolution during the stellar lifetime, in particular during the early stages. Stellar rotational periods can be determined on the basis of the periodic modulation of starlight produced by non-uniformities on the surface of the stars, due to manifestation of stellar activity. W…
ALMA observations of the Red Rectangle, a preliminary analysis
Sánchez Contreras, C.; Alcolea, J.; Santander-García, M. +5 more
Aims: We aim to study equatorial disks in rotation and axial outflows in post-AGB objects so as to disclose the formation and shaping mechanisms in planetary nebulae. So far, both disks and outflows have not been observed simultaneously.
Methods: We obtained high-quality ALMA observations of 12CO and 13CO J = 3-2 an…
Contamination of Broadband Photometry by Nebular Emission in High-redshift Galaxies: Investigations with Keck's MOSFIRE Near-infrared Spectrograph
Stark, Daniel P.; Ellis, Richard S.; Konidaris, Nick P. +1 more
Earlier work has raised the potential importance of nebular emission in the derivation of the physical characteristics of high-redshift Lyman break galaxies. Within certain redshift ranges, and especially at z ~= 6-7, such lines may be strong enough to reduce estimates of the stellar masses and ages of galaxies compared with those derived assuming…
Bursty magnetic reconnection at Saturn's magnetopause
Coates, A. J.; Dougherty, M. K.; Hasegawa, H. +6 more
We infer the evolution of magnetopause reconnection from simultaneous in situ magnetopause crossings and auroral observations by Cassini on 19 July 2008. Depending on the magnetosheath field, it proceeds from (i) the high-latitude lobe, producing a cusp spot in the aurora, to (ii) lower latitude but north of Cassini, evidenced by an enhancement of…