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High Forbidden-to-resonance Line Ratio of O VII Discovered from the Cygnus Loop
Tanaka, T.; Mori, K.; Gu, L. +5 more
Charge exchange (CX) is an important process in shock physics because it indicates an interaction between downstream ions and ambient neutral hydrogen, suggesting the presence of a collisionless shock. We present a high-resolution spectroscopy of an X-ray bright spot in a nearby supernova remnant (SNR), the Cygnus Loop, with the Reflection Grating…
DustPedia: the relationships between stars, gas, and dust for galaxies residing in different environments
Bianchi, S.; Fritz, J.; Madden, S. C. +20 more
We use a sub-set of the DustPedia galaxy sample (461 galaxies) to investigate the effect the environment has had on galaxies. We consider Virgo cluster and field samples and also assign a density contrast parameter to each galaxy, as defined by the local density of SDSS galaxies. We consider their chemical evolution (using MDust/MB…
Preflare Processes, Flux Rope Activation, Large-scale Eruption, and Associated X-class Flare from the Active Region NOAA 11875
Joshi, Bhuwan; Mitra, Prabir K.
We present a multiwavelength analysis of the eruption of a hot coronal channel associated with an X1.0 flare (SOL2013-10-28T02:03) from the active region NOAA 11875 by combining observations from Atmospheric Imaging Assembly/Solar Dynamics Observatory (SDO), Helioseismic and Magnetic Imager/SDO, Reuven Ramaty High Energy Solar Spectroscopic Imager…
Identification of RR Lyrae Stars in Multiband, Sparsely Sampled Data from the Dark Energy Survey Using Template Fitting and Random Forest Classification
Bechtol, K.; Smith, M.; D'Andrea, C. B. +76 more
Many studies have shown that RR Lyrae variable stars (RRL) are powerful stellar tracers of Galactic halo structure and satellite galaxies. The Dark Energy Survey (DES), with its deep and wide coverage (g ∼ 23.5 mag in a single exposure; over 5000 deg2) provides a rich opportunity to search for substructures out to the edge of the Milky …
The fate of the interstellar medium in early-type galaxies. I. First direct measurement of the timescale of dust removal
Frayer, D. T.; Michałowski, M. J.; Hughes, D. H. +12 more
Context. An important aspect of quenching star formation is the removal of the cold interstellar medium (ISM; non-ionised gas and dust) from a galaxy. In addition, dust grains can be destroyed in a hot or turbulent medium. The adopted timescale of dust removal usually relies on uncertain theoretical estimates. It is tricky to track dust removal be…
A rogues gallery of Andromeda's dwarf galaxies - II. Precise distances to 17 faint satellites
Lewis, Geraint F.; Dolphin, Andrew E.; Skillman, Evan D. +8 more
We present new horizontal branch (HB) distance measurements to 17 of the faintest known M31 satellites (-6 ≲ MV ≲ -13) based on deep Hubble Space Telescope (HST) imaging. The colour-magnitude diagrams extend ∼1-2 mag below the HB, which provides for well-defined HBs, even for faint galaxies in which the tip of the red giant branch (TRGB…
HD 99458: First time ever Ap-type star as a δ Scuti pulsator in a short period eclipsing binary?
Sabotta, S.; Paunzen, E.; Skarka, M. +18 more
We present the discovery of a unique object, a chemically peculiar Ap-type star showing δ Scuti pulsations that is bound in an eclipsing binary system with an orbital period shorter than 3 d. HD 99458 is therefore a complex astrophysical laboratory opening doors for studying various, often contradictory, physical phenomena at the same time. It is …
Supergranular turbulence in the quiet Sun: Lagrangian coherent structures
Miranda, Rodrigo A.; Chian, Abraham C. -L.; Kusano, Kanya +6 more
The quiet Sun exhibits a wealth of magnetic activities that are fundamental for our understanding of solar magnetism. The magnetic fields in the quiet Sun are observed to evolve coherently, interacting with each other to form prominent structures as they are advected by photospheric flows. The aim of this paper is to study supergranular turbulence…
GIARPS High-resolution Observations of T Tauri stars (GHOsT). I. Jet line emission
Munari, U.; Bacciotti, F.; Fedele, D. +9 more
Context. The mechanism for jet formation in the disks of T Tauri stars remains poorly understood. Observational benchmarks to launching models can be provided by tracing the physical properties of the kinematic components of the wind and jet in the inner 100 au of the disk surface.
Aims: In the framework of the GIARPS High-resolution Observat…
The Massive Star-forming Regions Omnibus X-ray Catalog, Third Installment
Garmire, Gordon P.; Townsley, Leisa K.; Broos, Patrick S. +1 more
We offer to the star formation community the third installment of the Massive Star-forming Regions (MSFRs) Omnibus X-ray Catalog (MOXC3), a compilation of X-ray point sources detected in 50 archival Chandra Advanced CCD Imaging Spectrometer observations of 14 Galactic MSFRs and surrounding fields. The MOXC3 MSFRs are NGC 2264, NGC 6193, RCW 108-IR…