Search Publications
Broad-line region clouds orbiting an AGN sample
Logan, C. H. A.; Llerena, M.; Armijos-Abendaño, J. +1 more
We present a spectral and temporal analysis of XMM-Newton data from a sample of six galaxies (NGC 3783, Mrk 279, Mrk 766, NGC 3227, NGC 7314, and NGC 3516). Using the hardness-ratio curves, we identify time intervals in which clouds are eclipsing the central X-ray source in five of the six sources. We detect three occultations in NGC 3227 and one …
H α-based star formation rates in and around z 0.5 EDisCS clusters
Weiner, Benjamin J.; Teplitz, Harry I.; Moustakas, John +14 more
We investigate the role of environment on star formation rates (SFRs) of galaxies at various cosmic densities in well-studied clusters. We present the star-forming main sequence for 163 galaxies in four EDisCS clusters in the range 0.4 < z < 0.7. We use Hubble Space Telescope/Wide Field Camera 3 observations of the H α emission line to span …
Weather forecast of the Milky Way: shear and stellar feedback determine the lives of Galactic-scale filaments
Li, Guang-Xing; Chen, Bing-Qiu; Zhou, Ji-Xuan
The interstellar medium (ISM) is an inseparable part of the Milky Way ecosystem whose evolutionary history remains a challenging question. We trace the evolution of the molecular ISM using a sample of young stellar objects (YSO) association-molecular cloud complex (YSO-MC complex). We derive their three-dimensional (3D) velocities by combining the…
A survey of deuterated ammonia in the Cepheus star-forming region L1251
Di Francesco, James; Keown, Jared; Shirley, Yancy L. +4 more
Understanding the chemical processes during starless core and prestellar core evolution is an important step in understanding the initial stages of star and disc formation. This project is a study of deuterated ammonia, o-NH2D, in the L1251 star-forming region towards Cepheus. Twenty-two dense cores (20 of which are starless or prestell…
Recent formation and likely cometary activity of near-Earth asteroid pair 2019 PR2-2019 QR6
Gustafsson, Annika; Christensen, Eric; Micheli, Marco +13 more
Asteroid pairs are genetically related asteroids that recently separated (<few million years), but still reside on similar heliocentric orbits. A few hundred of these systems have been identified, primarily in the asteroid main belt. Here, we studied a newly discovered pair of near-Earth objects (NEOs): 2019 PR2 and 2019 QR6. Based on broad-ban…
Multiresolution angular momentum measurements of z 1.5-2 star-forming galaxies
Glazebrook, Karl; Fisher, Deanne B.; Obreschkow, Danail +5 more
We present detailed stellar specific angular momentum (j*) measurements of 10 star-forming galaxies at z ~ 1.5-2, using both high and low spatial resolution integral field spectroscopic data. We developed a code that simultaneously models the adaptive optics (AO) assisted observations from OSIRIS/SINFONI along with their natural seeing …
GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline
Kumar, Brajesh; De, Kishalay; Sharma, Yashvi +17 more
S190426c/GW190426_152155 was the first probable neutron star-black hole merger candidate detected by the LIGO-Virgo Collaboration. We undertook a tiled search for optical counterparts of this event using the 0.7-m GROWTH-India Telescope. Over a period of two weeks, we obtained multiple observations over a 22.1 deg2 area, with a 17.5 per…
Discovery of quasi-periodic oscillations in the persistent X-ray emission of accreting binary X-ray pulsar LMC X-4
Paul, Biswajit; Paul, K. T.; Rikame, Ketan +1 more
We report the discovery of quasi-periodic oscillations (QPOs) in the high-mass X-ray binary (HMXB) pulsar LMC X-4 in its non-flaring (persistent) state using observations with XMM-Newton. In addition to the 74 mHz coherent pulsations, the persistent emission light curve shows a QPO feature in the frequency range of 20-30 mHz. Quasi-periodic flares…
Combining Rosetta's GIADA and MIDAS data: morphological versus dynamical properties of dust at 67P/Churyumov-Gerasimenko
Lasue, J.; Fulle, M.; Della Corte, V. +10 more
We related morphological (size/shape) and dynamical properties of the dust ejected from the 67P/Churyumov-Gerasimenko comet by combining data from two instruments onboard the ESA's Rosetta mission, i.e. the MIDAS atomic force microscope and the GIADA dust detector. The two instruments detected dust of different size (10-6-10-5
A survey for variable young stars with small telescopes - V. Analysis of TX Ori, V505 Ori, and V510 Ori, the HST ULLYSES targets in the σ Ori cluster
Eislöffel, Jochen; Hambsch, Franz-Josef; Froebrich, Dirk +2 more
Investigations of the formation of young stellar objects (YSOs) and planets require the detailed analysis of individual sources as well as statistical analysis of a larger number of objects. The Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) project provides such a unique opportunity by establishing a UV spectroscopic lib…