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An Asymmetric Dust Ring around a Very Low Mass Star ZZ Tau IRS
Dong, Ruobing; Hashimoto, Jun; Muto, Takayuki
We present Atacama Large Millimeter/submillimeter Array (ALMA) gas and dust observations at band 7 (339 GHz: 0.89 mm) of the protoplanetary disk around a very low mass star ZZ Tau IRS with a spatial resolution of 0"25. The 12CO J = 3 → 2 position-velocity diagram suggests a dynamical mass of ZZ Tau IRS of ∼0.1-0.3 M⊙. The dis…
Massive young stellar objects in the Local Group irregular galaxy NGC 6822 identified using machine learning
van Loon, Jacco Th; Oliveira, Joana M.; Kinson, David A.
We present a supervised machine learning methodology to classify stellar populations in the Local Group dwarf-irregular galaxy NGC 6822. Near-IR colours (J - H, H - K, and J - K), K-band magnitudes and far-IR surface brightness (at 70 and 160 $\mu$m) measured from Spitzer and Herschel images are the features used to train a Probabilistic Random Fo…
The dependence of the hierarchical distribution of star clusters on galactic environment
Grebel, Eva K.; Smith, Linda J.; Calzetti, Daniela +15 more
We use the angular two-point correlation function (TPCF) to investigate the hierarchical distribution of young star clusters in 12 local (3-18 Mpc) star-forming galaxies using star cluster catalogs obtained with the Hubble Space Telescope (HST) as part of the Treasury Program Legacy ExtraGalactic UV Survey. The sample spans a range of different mo…
Physical characterization of recently discovered globular clusters in the Sagittarius dwarf spheroidal galaxy. I. Metallicities, ages, and luminosities
Minniti, D.; Alonso-García, J.; Gómez, M. +1 more
Context. Globular clusters (GCs) are important tools for rebuilding the accretion history of a galaxy. In particular, newly discovered GCs in the Sagittarius (Sgr) dwarf galaxy can be used as probes of the accretion event onto the Milky Way (MW).
Aims: Our main aim is to characterize the GC system of the Sgr dwarf galaxy by measuring its main…
Tracing the Milky Way's Vestigial Nuclear Jet
Bland-Hawthorn, Joss; Mukherjee, Dipanjan; Wagner, Alexander Y. +2 more
MeerKAT radio continuum and XMM-Newton X-ray images have recently revealed a spectacular bipolar channel at the Galactic Center that spans several degrees (~0.5 kpc). An intermittent jet likely formed this channel and is consistent with earlier evidence of a sustained, Seyfert-level outburst fueled by black hole accretion onto Sgr A* several Myr a…
Searching for new solar twins: The Inti survey for the Northern Sky
Meléndez, Jorge; Reggiani, Henrique; Schlaufman, Kevin C. +9 more
Solar twins are key in different areas of astrophysics, however only just over a hundred were identified and well-studied in the last two decades. In this work, we take advantage of the very precise Gaia (DR2/EDR3), Tycho, and 2MASS photometric systems to create the ${{Inti}}$ survey of new solar twins in the Northern Hemisphere. The spectra of ou…
Calibrating X-Ray Binary Luminosity Functions via Optical Reconnaissance. I. The Case of M83
Chandar, Rupali; Mok, Angus; Gallo, Elena +4 more
Building on recent work by Chandar et al., we construct X-ray luminosity functions (XLFs) for different classes of X-ray binary (XRB) donors in the nearby star-forming galaxy M83 through a novel methodology. Rather than classifying low- versus high-mass XRBs based on the scaling of the number of X-ray sources with stellar mass and star formation r…
Structure and dynamics of the inner nebula around the symbiotic stellar system R Aquarii
Alcolea, J.; Santander-García, M.; Bujarrabal, V. +5 more
Aims: We investigate the structure, dynamics, and chemistry of the molecule-rich nebula around the stellar symbiotic system R Aqr, which is significantly affected by the presence of a white dwarf (WD) companion. We study the effects of the strong dynamical interaction between the AGB wind and the WD and of photodissociation by the WD UV radia…
StrayCats: A Catalog of NuSTAR Stray Light Observations
Hare, Jeremy; García, Javier A.; Madsen, Kristin K. +10 more
We present StrayCats, a catalog of NuSTAR stray light observations of X-ray sources. Stray light observations arise for sources 1°-4° away from the telescope pointing direction. At this off-axis angle, X-rays pass through a gap between the optics and aperture stop and so do not interact with the X-ray optics; instead, they directly illuminate the …
Statistical analysis of soft X-ray solar flares during solar cycles 22, 23, and 24
Xiong, Bo; Li, Xiaolin; Wang, Ting +1 more
This paper presents a statistical analysis of soft X-ray flares during the period January 1986 to June 2017 covering the last three solar cycles (SCs) 22, 23, and 24. We have analyzed the distribution of flare number, the relationship between the occurrence rate of soft X-ray flares and solar activity, and the duration of different intensity class…