Search Publications
Measuring Stellar Masses of Emission-line Galaxies at 1.2 < z < 1.9
Yang, Guang; Gronwall, Caryl; Ciardullo, Robin +4 more
The accurate measurement of stellar masses over a wide range of galaxy properties is essential for better constraining models of galaxy evolution. Emission-line galaxies (ELGs) tend to have better redshift estimates than continuum-selected objects, and have been shown to span a large range of physical properties, including stellar mass. Using data…
AGN Triality of Triple Mergers: Multiwavelength Classifications
Gültekin, Kayhan; Runnoe, Jessie C.; Foord, Adi +1 more
We present results from a multiwavelength analysis searching for multiple active galactic nucleus (AGN) systems in nearby (z < 0.077) triple galaxy mergers. Combining archival Chandra, Sloan Digital Data Survey (SDSS), Wide-field Infrared Survey Explorer (WISE), and Very Large Array observations, we quantify the rate of nearby triple AGNs, as w…
Fine Structures of an EUV Wave Event from Multi-viewpoint Observations
Moon, Yong-Jae; Chen, P. F.; Schmieder, Brigitte +4 more
In this study, we investigate an extreme ultraviolet (EUV) wave event on 2010 February 11, which occurred as a limb event from the Earth viewpoint and a disk event from the Solar Terrestrial Relations Observatory-Behind viewpoint. We use the data obtained by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory in various EUV ch…
Searching for Dwarf Galaxies in Gaia DR2 Phase-space Data Using Wavelet Transforms
Darragh-Ford, Elise; Wechsler, Risa H.; Nadler, Ethan O. +1 more
We present a wavelet-based algorithm to identify dwarf galaxies in the Milky Way in Gaia DR2 data. Our algorithm detects overdensities in 4D position-proper-motion space, making it the first search to explicitly use velocity information to search for dwarf galaxy candidates. We optimize our algorithm and quantify its performance by searching for m…
Shock Properties and Associated Characteristics of Solar Energetic Particles in the 2017 September 10 Ground-level Enhancement Event
Jin, Meng; Liu, Ying D.; Xu, Xiaojun +3 more
The solar eruption on 2017 September 10 was accompanied by a fast coronal mass ejection (~3000 km s-1) and produced a ground-level enhancement (GLE) event at Earth. Multiple-viewpoint remote sensing observations are used to find the three-dimensional (3D) structure of the shock. We determine the shock parameters by combining the 3D shoc…
Local Active Galactic Nuclei with Large Broad-Hα Variability Reside in Red Galaxies
Wang, Jing; Liu, Wen-Juan; Yao, Su +4 more
Inspired by our serendipitous discovery of six active galactic nuclei (AGNs) with varying broad-Hα fluxes over years from our search for intermediate-mass black holes (IMBHs), we conduct a systematic investigation of changing-look (CL) and large-variability AGNs. We collect all the CL AGNs at z < 0.15 and the reverberation-mapped AGNs with stro…
Physical and Chemical Structure of the Disk and Envelope of the Class 0/I Protostar L1527
Flock, Mario; Terebey, Susan; Isella, Andrea +3 more
Submillimeter spectral line and continuum emission from the protoplanetary disks and envelopes of protostars is a powerful probe of their structure, chemistry, and dynamics. Here we present a benchmark study of our modeling code, RadChemT, that for the first time uses a chemical model to reproduce ALMA C18O (2-1), and CARMA 12
Using Chandra Localizations and Gaia Distances and Proper Motions to Classify Hard X-Ray Sources Discovered by INTEGRAL
Hare, Jeremy; Fornasini, Francesca M.; Bodaghee, Arash +7 more
Here, we report on X-ray observations of ten 17-60 keV sources discovered by the International Gamma-Ray Astrophysics Laboratory satellite. The primary new information is sub-arcsecond positions obtained by the Chandra X-ray Observatory. In six cases (IGR J17040-4305, IGR J18017-3542, IGR J18112-2641, IGR J18434-0508, IGR J19504+3318, and IGR J200…
On the Collisional Disalignment of Dust Grains in Illuminated and Shaded Regions of IC 63
Soam, Archana; Andersson, B. -G.; Acosta-Pulido, Jose +5 more
Interstellar dust grain alignment causes polarization from UV to mm wavelengths, allowing the study of the geometry and strength of the magnetic field. Over the last couple of decades, observations and theory have led to the establishment of the radiative alignment torque mechanism as a leading candidate to explain the effect. With a quantitativel…
NOEMA Observations of CO Emission in Arp 142 and Arp 238
Xu, C. K.; Lisenfeld, U.; Gao, Y. +1 more
Previous studies have shown significant differences in the enhancement of the star formation rate (SFR) and star formation efficiency (SFE = SFR/Mmol) between spiral-spiral and spiral-elliptical mergers. In order to shed light on the physical mechanism of these differences, we present NOEMA observations of the molecular gas distribution…