Search Publications
The Proper Motion of the Pulsar J1124-5916 in the Galactic Supernova Remnant G292.0+1.8
Long, Xi; Plucinsky, Paul P.; Patnaude, Daniel J. +1 more
We present the first direct measurement of the proper motion of pulsar J1124-5916 in the young, oxygen-rich supernova remnant G292.0+1.8. Using deep Chandra ACIS-I observations from 2006 to 2016, we measure a positional change of 0.″21 ± 0.″05 over the ~10 yr baseline, or ~0.″02 yr-1. At a distance of 6.2 ± 0.9 kpc, this corresponds to …
The ESO-VLT MIKiS Survey Reloaded: Velocity Dispersion Profile and Rotation Curve of NGC 1904
Vesperini, Enrico; Pallanca, Cristina; Dalessandro, Emanuele +8 more
We present an investigation of the internal kinematic properties of M79 (NGC 1904). Our study is based on radial velocity measurements obtained from the ESO-VLT Multi-Instrument Kinematic Survey (MIKiS) of Galactic globular clusters for more than 1700 individual stars distributed between ~0.″3 and 770″ (~14 three-dimensional half-mass radii) from …
Plasma Composition Measurements in an Active Region from Solar Orbiter/SPICE and Hinode/EIS
Teriaca, Luca; Schmutz, Werner; Warren, Harry P. +28 more
A key goal of the Solar Orbiter mission is to connect elemental abundance measurements of the solar wind enveloping the spacecraft with extreme-UV (EUV) spectroscopic observations of their solar sources, but this is not an easy exercise. Observations from previous missions have revealed a highly complex picture of spatial and temporal variations o…
Connecting Chromospheric Condensation Signatures to Reconnection-driven Heating Rates in an Observed Flare
Qiu, Jiong; Longcope, Dana W.; Zhu, Chunming +1 more
Observations of solar flare reconnection at very high spatial and temporal resolution can be made indirectly at the footpoints of reconnected loops into which flare energy is deposited. The response of the lower atmosphere to this energy input includes a downward-propagating shock called chromospheric condensation, which can be observed in the UV …
The Molecular Composition of Shadowed Proto-solar Disk Midplanes Beyond the Water Snowline
Walsh, Catherine; Nomura, Hideko; Ohno, Kazumasa +3 more
The disk midplane temperature is potentially affected by the dust traps/rings. The dust depletion beyond the water snowline will cast a shadow. In this study, we adopt a detailed gas-grain chemical reaction network, and investigate the radial gas and ice abundance distributions of dominant carbon-, oxygen-, and nitrogen-bearing molecules in disks …
Concordance between Observations and Simulations in the Evolution of the Mass Relation between Supermassive Black Holes and Their Host Galaxies
Treu, Tommaso; Bhowmick, Aklant K.; Blecha, Laura +7 more
We carry out a comparative analysis of the relation between the mass of supermassive black holes (BHs) and the stellar mass of their host galaxies at 0.2 < z < 1.7 using well-matched observations and multiple state-of-the-art simulations (e.g., MassiveBlackII, Horizon-AGN, Illustris, TNG, and a semianalytic model). The observed sample consis…
Searching for Compact Objects in Binaries with Gaia DR3
Liu, Jifeng; Gu, Wei-Min; Yi, Tuan +4 more
We search for compact objects in binaries based on Gaia DR3. A sample of 10 targets is derived under the following conditions: the radial velocity variable, low temperature (T eff < 6000 K), high mass function (f(M 2) > 1M ⊙), and ellipsoidal-like light curves. Two targets have LAMOST spectroscopic observatio…
Observationally Constraining the Starspot Properties of Magnetically Active M67 Sub-subgiant S1063
Tofflemire, Benjamin M.; Gully-Santiago, Michael A.; Gosnell, Natalie M. +1 more
Our understanding of the impact of magnetic activity on stellar evolution continues to unfold. This impact is seen in sub-subgiant stars, defined to be stars that sit below the subgiant branch and red of the main sequence in a cluster color-magnitude diagram. Here we focus on S1063, a prototypical sub-subgiant in open cluster M67. We use a novel t…
Improving White Dwarfs as Chronometers with Gaia Parallaxes and Spectroscopic Metallicities
Fouesneau, Morgan; El-Badry, Kareem; Bailer-Jones, Coryn A. L. +9 more
White dwarfs (WDs) offer unrealized potential in solving two problems in astrophysics: stellar age accuracy and precision. WD cooling ages can be inferred from surface temperatures and radii, which can be constrained with precision by high-quality photometry and parallaxes. Accurate and precise Gaia parallaxes along with photometric surveys provid…
Compton-thick AGN in the NuSTAR Era. IX. A Joint NuSTAR and XMM-Newton Analysis of Four Local AGN
Cusumano, G.; Ajello, M.; La Parola, V. +7 more
We present the results of the broadband X-ray spectral analysis of simultaneous NuSTAR and XMM-Newton observations of four nearby Compton-thick active galactic nuclei (AGN) candidates selected from the Swift Burst Alert Telescope 150 month catalog. This work is part of a larger effort to identify and characterize all Compton-thick (N H …