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Testing the warmness of dark matter
Nunes, Rafael C.; Kumar, Suresh; Yadav, Santosh Kumar
Dark matter (DM) as a pressureless perfect fluid provides a good fit of the standard Λ cold dark matter (ΛCDM) model to the astrophysical and cosmological data. In this paper, we investigate two extended properties of DM: a possible time dependence of the equation of state of DM via Chevallier-Polarski-Linder parametrization, wdm = w
Searching for fast extragalactic X-ray transients in Chandra surveys
Bauer, F. E.; Brandt, W. N.; Xue, Y. Q. +4 more
Recent works have discovered two fast (≈10 ks) extragalactic X-ray transients in the Chandra Deep Field-South (CDF-S XT1 and XT2). These findings suggest that a large population of similar extragalactic transients might exist in archival X-ray observations. We develop a method that can effectively detect such transients in a single Chandra exposur…
The XUV irradiation and likely atmospheric escape of the super-Earth π Men c
Wheatley, Peter J.; Bourrier, Vincent; Ehrenreich, David +1 more
π Men c was recently announced as the first confirmed exoplanet from the TESS mission. The planet has a radius of just 2 R⊕ and it transits a nearby Sun-like star of naked-eye brightness, making it the ideal target for atmospheric characterization of a super-Earth. Here we analyse archival ROSAT and Swift observations of π Men in order …
OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing
Kim, S. -L.; Lee, C. -U.; Bennett, D. P. +102 more
We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismic analysis using ground-based data. We find that the source star is an oscillating red giant with a…
Physical Properties of Galactic RV Tauri Stars from Gaia DR2 Data
Kiss, L. L.; Bódi, A.
We present the first period-luminosity and period-radius relation of Galactic RV Tauri variable stars. We have surveyed the literature for all variable stars belonging to this class and compiled the full set of their photometric and spectroscopic measurements. We crossmatched the final list of stars with the Gaia Data Release 2 database and took t…
The MOSDEF Survey: No Significant Enhancement in Star Formation or Deficit in Metallicity in Merging Galaxy Pairs at 1.5 ≲ z ≲ 3.5
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +15 more
We study the properties of 30 spectroscopically identified pairs of galaxies observed during the peak epoch of star formation in the universe. These systems are drawn from the MOSFIRE Deep Evolution Field (MOSDEF) Survey at 1.4 ≤ z ≤ 3.8, and are interpreted as early-stage galaxy mergers. Galaxy pairs in our sample are identified as two objects wh…
Initial phases of high-mass star formation: a multiwavelength study towards the extended green object G12.42+0.50
Tej, Anandmayee; Liu, Tie; Ishwara Chandra, C. H. +4 more
We present a multiwavelength study of the extended green object, G12.42+0.50, in this paper. The associated ionized, dust, and molecular components of this source are studied in detail employing various observations at near-, mid- and far-infrared, submillimetre, and radio wavelengths. Radio continuum emission mapped at 610 and 1390 MHz, using the…
Observations of Solar Wind from Earth-directed Coronal Pseudostreamers
Panasenco, O.; Wang, Y. -M.
Low-speed (≲450 km s-1) solar wind is widely considered to originate from streamer loops that intermittently release their contents into the heliosphere, in contrast to high-speed wind, which has its source in large coronal holes. To account for the presence of slow wind far from the heliospheric current sheet (HCS), it has been suggest…
The nature of the soft excess and spectral variability in the Seyfert 1 galaxy Zw 229.015
Welsh, W. F.; Gallo, L. C.; Waddell, S. G. H. +2 more
We have carried out a systematic analysis of the nearby (z = 0.0279) active galaxy Zw 229.015 using multi-epoch, multi-instrument, and deep pointed observations with XMM-Newton, Suzaku, Swift,and NuSTAR. Spectral and temporal variability are examined in detail on both the long (weeks-to-years) and short (hours) time-scales. A deep Suzaku observati…
Simulating cosmological substructure in the solar neighbourhood
Grand, Robert J. J.; Gómez, Facundo A.; Marinacci, Federico +8 more
We explore the predictive power of cosmological, hydrodynamical simulations for stellar phase-space substructure and velocity correlations with the AURIGA simulations and AURIGAIA mock Gaia catalogues. We show that at the solar circle the AURIGA simulations commonly host phase-space structures in the stellar component that have constant orbital en…