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Building an Acceleration Ladder with Tidal Streams and Pulsar Timing
Craig, Peter; Chakrabarti, Sukanya; Sanderson, Robyn E. +1 more
We analyse stellar streams in action-angle coordinates combined with recent local direct acceleration measurements to provide joint constraints on the potential of our galaxy. Our stream analysis uses the Kullback-Leibler divergence with a likelihood analysis based on the two-point correlation function. We provide joint constraints from pulsar acc…
Measuring mass transfer of AM CVn binaries with a space-based gravitational wave detector
Wang, Zijian; Cao, Zhoujian; Zhang, Xian-Fei
The formation mechanism of AM CVn binary has not been well understood yet. Accurate measurements of the mass transfer rate can help us to determine the formation mechanism. But unfortunately such observation by electromagnetic means is quite challenging. One possible formation channel of AM CVn binary is a semidetached white dwarf binary. Such sys…
XMM-Newton and INTEGRAL Observations of the Bright GRB 230307A: Vanishing of the Local Absorption and Limits on the Dust in the Magellanic Bridge
Mereghetti, Sandro; Tiengo, Andrea; Salvaterra, Ruben +2 more
GRB 230307A is the second brightest gamma-ray burst detected in more than 50 years of observations and is located in the direction of the Magellanic Bridge. Despite its long duration, it is most likely the result of the merger of a compact binary ejected from a galaxy in the local universe (redshift z = 0.065). Our XMM-Newton observation of its af…
Population study of astrophysical false positive detections in the southern PLATO field
Bray, J. C.; Kolb, U.; Rowden, P. +3 more
For the upcoming PLAnetary Transits and Oscillation of stars (PLATO) satellite mission, a large number of target stars are required to yield a statistically significant number of planet transits. Locating the centres of the long duration observational phase (LOP) fields closer to the Galactic plane will increase the target star numbers but also th…
High-resolution SOFIA/EXES Spectroscopy of Water Absorption Lines in the Massive Young Binary W3 IRS 5
Montiel, Edward; Neufeld, David; Indriolo, Nick +9 more
We present in this paper mid-infrared (5-8 µm) spectroscopy toward the massive young binary W3 IRS 5, using the Echelon Cross Echelle Spectrograph (EXES) spectrometer in high-resolution mode (R ~ 50,000) from the NASA Stratospheric Observatory for Infrared Astronomy (SOFIA). Many (~180) ν 2 = 1-0 and (~90) ν 2 = 2-1 abs…
Massive Molecular Gas Companions Uncovered by Very Large Array CO(1-0) Observations of the z = 5.2 Radio Galaxy TN J0924-2201
Imanishi, Masatoshi; Kohno, Kotaro; Schramm, Malte +9 more
We present Karl G. Jansky Very Large Array K-band (19 GHz) observations of the redshifted CO(1-0) line emission toward the radio galaxy TN J0924-2201 at z = 5.2, which is one of the most distant radio galaxies with CO detected. With an angular resolution of ~2″, the CO(1-0) line emission is resolved into three clumps, within ±500 km s-1…
Validating Stellar Abundance Measurements from Multiresolution Spectroscopy
Ting, Yuan-Sen; Weisz, Daniel R.; Sandford, Nathan R.
Large-scale surveys will provide spectroscopy for ~50 million resolved stars in the Milky Way and Local Group. However, these data will have a high degree of heterogeneity and most will be low-resolution (R < 10,000), posing challenges to measuring consistent and reliable stellar labels. Here, we introduce a framework for identifying and remedy…
Concurrence of a Kelvin-Helmholtz instability and Kármán vortex street in the Sun's corona
Long, David M.; Fu, Hui; Li, Bo +4 more
Context. Instabilities are crucial to understanding the mass transportation and energy transformation in the solar atmosphere. Observations of the concurrence among the Kelvin-Helmholtz instability (KHI) and Kármán vortex street (KVS) in conditions as extreme as the Sun's corona have yet to be reported.
Aims: We aim to find evidence of a conc…
First r-process enhanced star confirmed as a member of the Galactic bulge
Schultheis, M.; Ryde, N.; Rich, R. M. +4 more
Aims: Stars with strong enhancements of r-process elements are rare and tend to be metal-poor, generally with [Fe/H] < −2 dex, and located in the halo. In this work, we aim to investigate a candidate r-process enriched bulge star with a relatively high metallicity of [Fe/H] ~ − 0.65 dex and to compare it with a previously published r-rich …
Characteristics of X-class flares of solar cycles 23 and 24 in X-ray and EUV bands
Bhardwaj, Anil; Kumar, A.; Chakrabarty, D. +4 more
The characteristics of X-class flares of solar cycles 23 and 24 are examined based on the soft X-ray (0.1-0.8 nm) and EUV (26-34 nm) light curves. First, the commonly used correction factors for the center-to-limb variation of EUV flux are compared. Subsequently, enhancements in X-ray and EUV levels are used to calculate the relative apportionment…