Search Publications
Superresolution Reconstruction of Severely Undersampled Point-spread Functions Using Point-source Stacking and Deconvolution
Zemcov, Michael; Symons, Teresa; Bock, James +4 more
Point-spread function (PSF) estimation in spatially undersampled images is challenging because large pixels average fine-scale spatial information. This is problematic when fine-resolution details are necessary, as in optimal photometry where knowledge of the illumination pattern beyond the native spatial resolution of the image may be required. H…
High-redshift Narrow-line Seyfert 1 Galaxies: A Candidate Sample
Stalin, C. S.; Rakshit, Suvendu; Shin, Jaejin +1 more
The study of narrow-line Seyfert 1 galaxies (NLS1s) is now mostly limited to low redshift (z < 0.8) because their definition requires the presence of the Hβ emission line, which is redshifted out of the spectral coverage of major ground-based spectroscopic surveys at z > 0.8. We studied the correlation between the properties of Hβ and Mg II …
WawHelioGlow: A Model of the Heliospheric Backscatter Glow. II. The Helioglow Buildup and the Potential Significance of the Anisotropy in the Solar EUV Output
Bzowski, M.; Kubiak, M. A.; Kowalska-Leszczynska, I. +1 more
The helioglow is the fluorescence of interstellar atoms inside the heliosphere, where they are excited by the solar EUV. Because the mean free path between collisions for interstellar gas is comparable to the size of the heliosphere, the distribution function of this gas inside the heliosphere strongly varies in space and with time and is non-Maxw…
TIMES. I. A Systematic Observation in Multiple Molecular Lines toward the Orion A and Ophiuchus Clouds
Cho, Jungyeon; Choi, Minho; Choi, Yunhee +16 more
We have used the Taeduk Radio Astronomy Observatory to observe the Orion A and Ophiuchus clouds in the J = 1-0 lines of 13CO, C18O, HCN, HCO+, and N2H+ and the J = 2-1 line of CS. The fully sampled maps with uniform noise levels are used to create moment maps. The variations of the line intens…
Chromospheric Activity of Periodic Variable Stars Based on the LAMOST Low- and Medium-resolution Spectral Survey
Shi, Jianrong; Han, Xianming L.; Zhang, Li-yun +5 more
We present a catalog of 75,867 periodic variable stars from data release 7 of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope. We calculated the chromospheric activity index, equivalent widths for 201,349 spectra, and excess fractional luminosity ( ${R}_{{\rm{H}}\alpha }^{{\prime} }$ ) for 130,796 spectra. Based on the intensity of t…
Hubble Frontier Field Clusters and Their Parallel Fields: Photometric and Photometric Redshift Catalogs
Mobasher, Bahram; Davidzon, I.; Sánchez, F. J. +1 more
We present a multiband analysis of the six Hubble Frontier Field clusters and their parallel fields, producing catalogs with measurements of source photometry and photometric redshifts. We release these catalogs to the public along with maps of intracluster light and models for the brightest galaxies in each field. This rich data set covers a wave…
Improved Atomic Transition Probabilities for UV and Optical Lines of Hf II and Determination of the Hf Abundance in Two Metal-poor Stars
Roederer, I. U.; Lawler, J. E.; Den Hartog, E. A.
We report new branching fraction measurements for 199 UV and optical transitions of Hf II. These transitions range in wavelength (wavenumber) from 2068 to 6584 Å (48,322-15,183 cm-1) and originate in 17 odd-parity upper levels ranging in energy from 38,578 to 53,227 cm-1. The branching fractions are combined with radiative li…
The HASHTAG Project: The First Submillimeter Images of the Andromeda Galaxy from the Ground
Ho, Luis C.; Lee, Chien-Hsiu; Clark, Christopher J. R. +46 more
Observing nearby galaxies with submillimeter telescopes on the ground has two major challenges. First, the brightness is significantly reduced at long submillimeter wavelengths compared to the brightness at the peak of the dust emission. Second, it is necessary to use a high-pass spatial filter to remove atmospheric noise on large angular scales, …
X-Ray-to-radio Offset Inference from Low-count X-Ray Jets
Georganopoulos, Markos; Meyer, Eileen T.; Reddy, Karthik
Observations of positional offsets between the location of X-ray and radio features in many resolved, extragalactic jets indicates that the emitting regions are not cospatial, an important piece of evidence in the debate over the origin of the X-ray emission on kiloparsec scales. The existing literature is nearly exclusively focused on jets with s…
Background Short-period Eclipsing Binaries in the Original Kepler Field
Bódi, Attila; Szabó, Róbert; Forró, Adrienn +2 more
During the primary Kepler mission, between 2009 and 2013, about 150,000 preselected targets were observed with a 29.42 minute long cadence. However, a survey of background stars that fall within the field of view (FOV) of the downloaded apertures of the primary targets has revealed a number of interesting objects. In this paper, we present the res…