Search Publications
Disturbed Zone and Piston Shock Ahead of Coronal Mass Ejection
Eselevich, M.; Eselevich, V.
The 2010 June 13 coronal mass ejection (CME) propagating toward the position angle P.A. ≈ 245° (measured counterclockwise from the Sun's north pole) was studied from the SDO/AIA and SOHO/LASCO C2, C3 data. We show that ahead of the CME frontal structure, as a result of its interaction with the undisturbed solar wind, a disturbed region (with an in…
Three-dimensional Structure and Evolution of Extreme-ultraviolet Bright Points Observed by STEREO/SECCHI/EUVI
Moon, Yong-Jae; Chae, Jongchul; Zhang, Jie +4 more
We unveil the three-dimensional structure of quiet-Sun EUV bright points and their temporal evolution by applying a triangulation method to time series of images taken by SECCHI/EUVI on board the STEREO twin spacecraft. For this study we examine the heights and lengths as the components of the three-dimensional structure of EUV bright points and t…
Physical Properties of Lyα Emitters at z ~ 0.3 from UV-to-FIR Measurements
Berta, S.; Magnelli, B.; Lutz, D. +25 more
The analysis of the physical properties of low-redshift Lyα emitters (LAEs) can provide clues in the study of their high-redshift analogs. At z ~ 0.3, LAEs are bright enough to be detected over almost the entire electromagnetic spectrum and it is possible to carry out a more precise and complete study than at higher redshifts. In this work, we exa…
Early Ultraviolet Observations of a Type IIn Supernova (2007pk)
Brown, P. J.; Oates, S. R.; Holland, S. T. +6 more
We present some of the earliest UV observations of a Type IIn supernova (SN)—SN 2007pk, where UV and optical observations using Swift's Ultra-Violet/Optical Telescope began 3 days after discovery or ~5 days after shock breakout. The SN observations commence at approximately maximum light in the UV and u-band filters, suggesting that the UV light c…
Preprocessing Magnetic Fields with Chromospheric Longitudinal Fields
Kusano, K.; Yamamoto, Tetsuya T.
Nonlinear force-free field (NLFFF) extrapolation is a powerful tool for the modeling of the magnetic field in the solar corona. However, since the photospheric magnetic field does not in general satisfy the force-free condition, some kind of processing is required to assimilate data into the model. In this paper, we report the results of new prepr…
Spatially Resolved HST Grism Spectroscopy of a Lensed Emission Line Galaxy at z ~ 1
Broadhurst, Tom; Frye, Brenda L.; Bowen, David V. +6 more
We take advantage of gravitational lensing amplification by A1689 (z = 0.187) to undertake the first space-based census of emission line galaxies (ELGs) in the field of a massive lensing cluster. Forty-three ELGs are identified to a flux of i 775 = 27.3 via slitless grism spectroscopy. One ELG (at z = 0.7895) is very bright owing to len…
The Central Blue Straggler Population in Four Outer-halo Globular Clusters
Lützgendorf, Nora; Ferraro, Francesco R.; Lanzoni, Barbara +6 more
Using Hubble Space Telescope/Wide Field Planetary Camera 2 data, we have performed a comparative study of the Blue Straggler Star (BSS) populations in the central regions of the globular clusters (GCs) AM 1, Eridanus, Palomar 3, and Palomar 4. Located at distances R GC > 50 kpc from the Galactic center, these are (together with Palom…
Detection of the 3.3 µm Aromatic Feature in the Supernova Remnant N49 with AKARI
Onaka, Takashi; Seok, Ji Yeon; Koo, Bon-Chul
We present an infrared (IR) study of the supernova remnant (SNR) N49 in the Large Magellanic Cloud with the near-IR (NIR; 2.5-5 µm) spectroscopic observations performed by AKARI. The observations were performed as a coarse spectral mapping to cover most of the bright region in the east, which enables us to compare the distribution of various…
Near-infrared Survey of the GOODS-North Field: Search for Luminous Galaxy Candidates at z >~ 6.5
Ferguson, Henry C.; Hathi, Nimish P.; Mobasher, Bahram +2 more
We present near-infrared (NIR; J and K s) survey of the Great Observatories Origins Deep Survey-North (GOODS-N) field. The publicly available imaging data were obtained using the MOIRCS instrument on the 8.2 m Subaru and the WIRCam instrument on the 3.6 m Canada-France-Hawaii Telescope (CFHT). These observations fulfill a serious wavele…
Chandra and Hubble Space Telescope Observations of the Supersoft ULX in NGC 247: Candidate for Standard Disk Emission
Tao, Lian; Feng, Hua; Grisé, Fabien +2 more
We report on multiwavelength observations of the supersoft ultraluminous X-ray source (ULX) in NGC 247 made with the Chandra X-Ray Observatory and Hubble Space Telescope. We aligned the X-ray and optical images using three objects present on both and identified a unique, point-like optical counterpart to the ULX. The X-ray to optical spectrum is w…