Search Publications
The Existence and Nature of the Interstellar Bow Shock
Ben-Jaffel, Lotfi; Grygorczuk, J.; Strumik, M. +1 more
We report a new diagnosis of two different states of the local interstellar medium (LISM) near our solar system by using a sensitivity study constrained by several distinct and complementary observations of the LISM, solar wind, and inner heliosphere. Assuming the Interstellar Boundary Explorer (IBEX) He flow parameters for the LISM, we obtain a s…
Multi-Wavelength Study of a Complete IRAC 3.6 µm Selected Galaxy Sample: A Fair Census of Red and Blue Populations at Redshifts 0.4-1.2
Barmby, P.; Wang, T.; Rigopoulou, D. +14 more
We present a multi-wavelength study of a 3.6 µm selected galaxy sample in the Extended Groth Strip (EGS). The sample is complete for galaxies with stellar mass >109.5 M ⊙ and redshift 0.4 < z < 1.2. In this redshift range, the Infrared Array Camera 3.6 µm band measures the rest-frame near-infrared band, p…
Wide-field Multiband Photometry of Globular Cluster Systems in the Fornax Galaxy Cluster
Kim, Hak-Sub; Chung, Chul; Sohn, Sangmo Tony +5 more
We present wide-field multiband photometry of globular cluster (GC) systems in NGC 1399, NGC 1404, and NGC 1387 located in the central region of the Fornax galaxy cluster. Observation was carried out through U, B, V, and I bands, which marks one of the widest and deepest U-band studies on extragalactic GC systems. The present U-band photometry ena…
Bright Ray-like Features in the Aftermath of Coronal Mass Ejections: White Light versus Ultraviolet Spectra
Webb, D. F.; Raymond, J. C.; Ciaravella, A. +1 more
Current sheets (CSs) are important signatures of magnetic reconnection in the eruption of confined solar magnetic structures. Models of coronal mass ejections (CMEs) involve formation of a CS connecting the ejected flux rope with the post-eruption magnetic loops. CSs have been identified in white light (WL) images of CMEs as narrow rays trailing t…
Probing the Radial Temperature Structure of Protoplanetary Disks with Herschel/HIFI
Fedele, D.; Henning, Th.; van Dishoeck, E. F. +4 more
Herschel/HIFI spectroscopic observations of CO J = 10-9, CO J = 16-15 and [C II] toward HD 100546 are presented. The objective is to resolve the velocity profile of the lines to address the emitting region of the transitions and directly probe the distribution of warm gas in the disk. The spectra reveal double-peaked CO line profiles centered on t…
A Comparison of Solar Energetic Particle Event Timescales with Properties of Associated Coronal Mass Ejections
Kahler, S. W.
The dependence of solar energetic proton (SEP) event peak intensities Ip on properties of associated coronal mass ejections (CMEs) has been extensively examined, but the dependence of SEP event timescales is not well known. We define three timescales of 20 MeV SEP events and ask how they are related to speeds v CME or widths W of their …
Discovery of a Quadruple Lens in CANDELS with a Record Lens Redshift z = 1.53
Ferguson, H. C.; Finkelstein, S. L.; Rudnick, G. H. +10 more
Using spectroscopy from the Large Binocular Telescope and imaging from the Hubble Space Telescope we discovered the first strong galaxy lens at z lens > 1. The lens has a secure photometric redshift of z = 1.53 ± 0.09 and the source is spectroscopically confirmed at z = 3.417. The Einstein radius (0.''35; 3.0 kpc) encloses 7.6 × 10
Comparing the White Dwarf Cooling Sequences in 47 Tuc and NGC 6397
Dotter, Aaron; Rich, R. Michael; Richer, Harvey B. +7 more
Using deep Hubble Space Telescope imaging, color-magnitude diagrams are constructed for the globular clusters 47 Tuc and NGC 6397. As expected, because of its lower metal abundance, the main sequence of NGC 6397 lies well to the blue of that of 47 Tuc. A comparison of the white dwarf cooling sequences of the two clusters, however, demonstrates tha…
Fast Extreme-ultraviolet Dimming Associated with a Coronal Jet Seen in Multi-wavelength and Stereoscopic Observations
Moon, Y. -J.; Innes, D. E.; Shibata, K. +3 more
We have investigated a coronal jet observed near the limb on 2010 June 27 by the Hinode/X-Ray Telescope (XRT), EUV Imaging Spectrograph (EIS), and Solar Optical Telescope (SOT), and by the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and on the disk by STEREO-A/EUVI. From EUV (AIA and EIS) and soft X-ray (XRT) images we hav…
Polycyclic Aromatic Hydrocarbon Emission in the Proplyd HST10: What is the Mechanism behind Photoevaporation?
Kamp, I.; Carmona, A.; Pantin, E. +4 more
Proplyds are photodissociation-region-(PDR)-like cometary cocoons around young stars which are thought to originate through photoevaporation of the central protoplanetary disk by external UV radiation from the nearby OB stars. This Letter presents spatially resolved mid-infrared imaging and spectroscopy of the proplyd HST10 obtained with the Very …