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ALMA resolves molecular clouds in metal-poor Magellanic Bridge A
Bolatto, A. D.; Rubio, M.; Saldaño, H. P. +2 more
Context. The Magellanic Bridge is a tidal feature located between the Magellanic Clouds, containing young stars formed in situ. Its proximity allows high-resolution studies of molecular gas, dust, and star formation in a tidal low-metallicity environment.
Aims: Our goal is to characterize gas and dust emission in Magellanic Bridge A, the sour…
Individual optical variability of active galactic nuclei from the MEXSAS2 sample
Paolillo, M.; Middei, R.; Vagnetti, F. +1 more
At present, most of the variability studies of active galactic nuclei (AGNs) are based on ensemble analyses. Nevertheless, it is interesting to provide estimates of the individual variability properties of each AGN, in order to relate them with intrinsic physical quantities. A useful data set is provided by the Catalina Surveys Data Release 2 (CSD…
Discovery of a Nearby Young Brown Dwarf Disk
Debes, John H.; Kiman, Rocio; Schneider, Adam C. +16 more
We report the discovery of the youngest brown dwarf with a disk at 102 pc from the Sun, WISEA J120037.79-784508.3 (W1200-7845), via the Disk Detective citizen science project. We establish that W1200-7845 is located in the ${3.7}_{-1.4}^{+4.6}$ Myr old ɛ Cha association. Its spectral energy distribution (SED) exhibits clear evidence of an infrared…
Calibrating the BHB star distance scale and the halo kinematic distance to the Galactic Centre
Utkin, Nikita D.; Dambis, Andrei K.
We report the first determination of the distance to the Galactic Centre based on the kinematics of halo objects. We apply the statistical-parallax technique to the sample of ~2500 blue horizontal branch (BHB) stars compiled by Xue et al. to simultaneously constrain the correction factor to the photometric distances of BHB stars as reported by tho…
Wavelet analysis of low frequency plasma oscillations in the magnetosheath of Mars
Fränz, M.; Bolzan, M. J. A.; Echer, E. +1 more
Wavelet analysis was employed to identify the major frequencies present in the plasma oscillations in the Martian magnetosheath. We have selected magnetosheath crossings and applied the Morlet wavelet transform to the electron density and temperature data, obtained from the Analyzer of Space Plasmas and Energetic Atoms experiment (ASPERA-3), onboa…
Long-period High-amplitude Red Variables in the KELT Survey
Pepper, Joshua; Stassun, Keivan G.; Siverd, Robert J. +8 more
We present a sample of 4132 Mira-like variables (red variables with long periods and high amplitudes) in the Kilodegree Extremely Little Telescope (KELT) survey. Of these, 376 are new Mira-like detections. We used Two Micron All Sky Survey (2MASS) colors to identify candidate asymptotic giant branch stars. We searched for photometric variability a…
The unusual behavior of the young X-ray pulsar SXP 1062 during the 2019 outburst
Maitra, Chandreyee; Haberl, Frank; Doroshenko, Victor +6 more
We present the results of the first dedicated observation of the young X-ray pulsar SXP 1062 in the broad X-ray energy band obtained during its 2019 outburst with the NuSTAR and XMM-Newton observatories. The analysis of the pulse-phase averaged and phase-resolved spectra in the energy band from 0.5 to 70 keV did not reveal any evidence for the pre…
Automatic catalog of RR Lyrae from ∼14 million VVV light curves: How far can we go with traditional machine-learning?
Gurovich, S.; Cabral, J. B.; Granitto, P. M. +1 more
Context. The creation of a 3D map of the bulge using RR Lyrae (RRL) is one of the main goals of the VISTA Variables in the Via Lactea Survey (VVV) and VVV(X) surveys. The overwhelming number of sources undergoing analysis undoubtedly requires the use of automatic procedures. In this context, previous studies have introduced the use of machine lear…
Peak Temperatures of Large Solar X-Ray Flares and Associated CME Speeds and Widths
Kahler, S. W.; Ling, A. G.
We recently repeated an earlier analysis by Garcia showing that large (≥M3.0) solar X-ray flares associated with solar energetic particle (SEP) events have significantly lower peak X-ray flux ratios R = (0.04-0.5 nm)/(0.1-0.8 nm), proxies for flare peak temperatures, than those without SEP events. As we expect SEP events to be produced by shocks a…
A Mean Density of 112 M⊙ pc-3 for Central Molecular Zone Clumps—Evidences for Shear-enabled Pressure Equilibrium in the Galactic Center
Zhang, Chuan-Peng; Li, Guang-Xing
We carry out a systematic study of the density structure of gas in the Central Molecular Zone (CMZ) in the Galactic center by extracting clumps from the APEX Telescope Large Area Survey of the Galaxy survey at 870 µm. We find that the clumps follow a scaling of m = ρ0r3, which corresponds to a characteristic density of …