Search Publications
The Near-infrared CO Absorption Band as a Probe to the Innermost Part of an AGN-obscuring Material
Nakagawa, Takao; Baba, Shunsuke; Isobe, Naoki +1 more
We performed a systematic analysis of the 4.67 µm CO ro-vibrational absorption band toward nearby active galactic nuclei (AGNs) and analyzed the absorption profiles of 10 nearby galaxies collected from the AKARI and Spitzer spectroscopic observations that show the CO absorption feature by fitting a plane-parallel local thermal equilibrium ga…
Concurrent Starbursts in Molecular Gas Disks within a Pair of Colliding Galaxies at z = 1.52
Daddi, E.; Rodighiero, G.; Smolčić, V. +20 more
We report on the discovery of a merger-driven starburst at z = 1.52, PACS-787, based on high signal-to-noise ALMA observations. CO(5-4) and continuum emission (850 µm) at a spatial resolution of 0.″3 reveal two compact (r 1/2 ∼ 1 kpc) and interacting molecular gas disks at a separation of 8.6 kpc, indicative of an early stage in a…
Observation and Modeling of Chromospheric Evaporation in a Coronal Loop Related to Active Region Transient Brightening
Gupta, G. R.; Tripathi, Durgesh; Sarkar, Aveek
Using the observations recorded by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory and the Interface Region Imaging Spectrograph (IRIS) and the Extreme-ultraviolet Imaging Spectrometer and X-Ray Telescope both on board Hinode, we present evidence of chromospheric evaporation in a coronal loop after the occurrence of …
Around the Way: Testing ΛCDM with Milky Way Stellar Stream Constraints
Robertson, Brant E.; Madau, Piero; Dai, Biwei
Recent analyses of the Pal 5 and GD-1 tidal streams suggest that the inner dark matter halo of the Milky Way is close to spherical, in tension with predictions from collisionless N-body simulations of cosmological structure formation. We use the Eris simulation to test whether the combination of dissipative physics and hierarchical structure forma…
Discovery of Tidal RR Lyrae Stars in the Bulge Globular Cluster M62
Minniti, Dante; Marconi, Marcella; Ripepi, Vincenzo +3 more
The RR Lyrae (RRL) rich globular cluster M62 (NGC 6266) is one of the most massive globular clusters in the Milky Way, located in the dense region of the Galactic bulge, where dynamical processes that affect the survival of globular clusters are maximized. Using Gaia second data release data we have found clear evidence for an excess of RRLs beyon…
Comprehensive Analysis of HD 105, A Young Solar System Analog
Marshall, J. P.; del Burgo, C.; Ertel, S. +5 more
HD 105 is a nearby, pre-main-sequence G0 star hosting a moderately bright debris disk (L dust/L ⋆ ∼ 2.6 × 10-4). The star and its surroundings might therefore be considered an analog of the young solar system. We refine the stellar parameters based on an improved Gaia parallax distance and identify it as a pre-main…
Importance of the Hα Visibility and Projection Effects for the Interpretation of Prominence Fine-structure Observations
Heinzel, Petr; Aulanier, Guillaume; Schmieder, Brigitte +2 more
We construct a new 3D Whole-prominence Fine-structure (WPFS) model based on a prominence magnetic field configuration designed to qualitatively approximate the morphology of a quiescent prominence observed on 2010 June 22. The model represents an entire prominence with its numerous fine structures formed by a prominence plasma located in dips in t…
Reconnection Acceleration in Saturn’s Dayside Magnetodisk: A Multicase Study with Cassini
Coates, A. J.; Krupp, N.; Dougherty, M. K. +16 more
Recently, rotationally driven magnetic reconnection was first discovered in Saturn’s dayside magnetosphere. This newly confirmed process could potentially drive bursty phenomena at Saturn, i.e., pulsating energetic particles and auroral emissions. Using Cassini’s measurements of magnetic fields and charged particles, we investigate particle accele…
Spatially Resolved Dust, Gas, and Star Formation in the Dwarf Magellanic Irregular NGC 4449
Östlin, G.; Roussel, H.; Rosa González, D. +17 more
We investigate the relation between gas and star formation in subgalactic regions, ∼360 pc to ∼1.5 kpc in size, within the nearby starburst dwarf NGC 4449, in order to separate the underlying relation from the effects of sampling at varying spatial scales. Dust and gas mass surface densities are derived by combining new observations at 1.1 mm, obt…
The 12CO2 and 13CO2 Absorption Bands as Tracers of the Thermal History of Interstellar Icy Grain Mantles
Boogert, Adwin; He, Jiao; Emtiaz, SM +1 more
Analyses of infrared signatures of CO2 in water-dominated ices in the ISM can give information on the physical state of CO2 in icy grains and on the thermal history of the ices themselves. In many sources, CO2 was found in the “pure” crystalline form, as signatured by the splitting in the bending mode absorption pr…