Search Publications
Seasonal Evolution on the Nucleus of Comet C/2013 A1 (Siding Spring)
Samarasinha, Nalin H.; A'Hearn, Michael F.; Bodewits, Dennis +6 more
We observed Comet C/Siding Spring using the Hubble Space Telescope (HST) during its close approach to Mars. The high spatial resolution images obtained through the F689M, F775W, and F845M filters reveal the characteristics of the dust coma. The dust production rate of C/Siding Spring, quantified by Afρ, is 590 ± 30, 640 ± 30, and 670 ± 30 cm in a …
Star Formation in Ultraluminous Infrared Galaxies Probed with AKARI Near-infrared Spectroscopy
Nakagawa, Takao; Isobe, Naoki; Shirahata, Mai +1 more
We conducted systematic observations of the H I Brα line (4.05 µm) and the polycyclic aromatic hydrocarbon (PAH) feature (3.3 µm) in 50 nearby (z\lt 0.3) ultraluminous infrared galaxies (ULIRGs) with AKARI. The Brα line is predicted to be the brightest among the H I lines under conditions of high dust extinction ({A}V\gt 15 …
Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters. II. NGC 5024, NGC 5272, and NGC 6352
Jefferys, W. H.; Stenning, D. C.; Wagner-Kaiser, R. +5 more
We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival Advanced Camera for Surveys Treasury observations of Galactic Globular Clusters to find and characterize two stellar populations in NGC 5024 (M53), NGC 5272 (M3), and NGC 6352. For these three clusters, both single and double-population analyses are used to determine a best…
From the LIR-T Relation to the Limited Sizes of Dusty Starbursting Regions at High Redshifts
Yan, Haojing; Ma, Zhiyuan
Using the far-infrared (IR) data obtained by the Herschel Space Observatory, we study the relation between the IR luminosity (LIR) and the dust temperature (T) of dusty starbursting galaxies at high redshifts (high-z). We focus on the total IR luminosity from the cold-dust component ({L}{IR}({cd)}), whose emission …
Wide Field CO Mapping in the Region of IRAS 19312+1950
Zhang, Yong; Hsia, Chih-Hao; Yung, Bosco H. K. +3 more
We report the results of wide field CO mapping in the region of IRAS 19312+1950. This Infrared Astronomical Satellite (IRAS) object exhibits SiO/H2O/OH maser emission, and is embedded in a chemically rich molecular component, the origin of which is still unknown. In order to reveal the entire structure and gas mass of the surrounding mo…
Current Sheet Structures Observed by the TESIS EUV Telescope during a Flux Rope Eruption on the Sun
Reva, A. A.; Ulyanov, A. S.; Kuzin, S. V.
We use the TESIS EUV telescope to study the current sheet signatures observed during flux rope eruption. The special feature of the TESIS telescope was its ability to image the solar corona up to a distance of 2 {R}⊙ from the Sun’s center in the Fe 171 Å line. The Fe 171 Å line emission illuminates the magnetic field lines, and the TES…
The Cold Dust Content of the Oxygen-rich Supernova Remnant G292.0+1.8
Ghavamian, Parviz; Williams, Brian J.
We present far-infrared images of the Galactic oxygen-rich supernova remnant (SNR) G292.0+1.8, acquired with the PACS and SPIRE instruments of the Herschel Space Observatory. We find that the SNR shell is detected in the PACS blue (100 µm) band, but not in the red (160 µm) band, broadly consistent with results from AKARI observations. …
A Decameter Stationary Type IV Burst in Imaging Observations on 2014 September 6
Koval, Artem; Stanislavsky, Aleksander; Chen, Yao +3 more
First-of-its-kind radio imaging of a decameter solar stationary type IV radio burst has been presented in this paper. On 2014 September 6 the observations of type IV burst radio emission were carried out with the two-dimensional heliograph based on the Ukrainian T-shaped radio telescope (UTR-2), together with other telescope arrays. Starting at ∼0…
Multi-wavelength Study of HESS J1741-302
Kargaltsev, Oleg; Sonbas, Eda; Hare, Jeremy +2 more
We present the results of two Chandra X-ray Observatory (CXO) observations of TeV γ-ray source HESS J1741-302. We investigate whether there is any connection between HESS J1741-302 and the sources seen at lower energies. One of the brightest X-ray sources in the HESS J1741-302 field, CXOU J174112.1-302908, appears to be associated with a low-mass …
Thermal Characteristics and the Differential Emission Measure Distribution During a B8.3 Flare on 2009 July 4
Awasthi, Arun Kumar; Jain, Rajmal; Sylwester, Barbara +1 more
We investigate the evolution of the differential emission measure distribution (DEM[T]) in various phases of a B8.3 flare which occurred on 2009 July 04. We analyze the soft X-ray (SXR) emission in the 1.6-8.0 keV range, recorded collectively by the Solar Photometer in X-rays (SphinX; Polish) and the Solar X-ray Spectrometer (Indian) instruments. …