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IRIS Si IV Line Profiles at Flare Ribbons as Indications of Chromospheric Condensation
Ding, M. D.; Li, Y.; Li, D. +3 more
We present temporal variations of the Si IV line profiles at the flare ribbons in three solar flares observed by the Interface Region Imaging Spectrograph. In the M1.1 flare on 2014 September 6 and the X1.6 flare on 2014 September 10, the Si IV line profiles evolve from wholly redshifted to red-wing enhanced with the flare development. However, in…
A plague of magnetic spots among the hot stars of globular clusters
Gullieuszik, M.; Milone, A. P.; Stetson, P. B. +15 more
For more than six decades, the quest to understand the formation of hot (about 20,000-30,000 K) extreme horizontal branch (EHB) stars in Galactic globular clusters has remained one of the most elusive in stellar evolutionary theory. Here we report on two discoveries that challenge the idea of the stable luminosity of EHB stars. The first mode of E…
Investigating the growing population of massive quiescent galaxies at cosmic noon
Papovich, Casey; Finkelstein, Steven L.; Stevans, Matthew L. +10 more
We explore the build-up of quiescent galaxies using a sample of 28 469 massive (M⋆ ≥ 1011 M⊙) galaxies at redshifts 1.5 < $z$ < 3.0, drawn from a 17.5 deg2 area (0.33 Gpc3 comoving volume at these redshifts). This allows for a robust study of the quiescent fraction as a function of mass …
Nature of Compton-thick Active Galactic Nuclei in "Nonmerging" Luminous Infrared Galaxies UGC 2608 and NGC 5135 Revealed with Broadband X-Ray Spectroscopy
Imanishi, Masatoshi; Tanimoto, Atsushi; Ueda, Yoshihiro +4 more
We have analyzed the broadband X-ray spectra of active galactic nuclei (AGNs) in two "nonmerging" luminous infrared galaxies (LIRGs), UGC 2608 and NGC 5135, utilizing the data of Nuclear Spectroscopic Telescope Array, Suzaku, XMM-Newton, and Chandra. Applying the X-ray clumpy-torus model (XCLUMPY), we find that both sources have similar spectra ch…
SPIDERS: overview of the X-ray galaxy cluster follow-up and the final spectroscopic data release
Finoguenov, A.; Salvato, M.; Merloni, A. +19 more
SPIDERS (The SPectroscopic IDentification of eROSITA Sources) is a large spectroscopic programme for X-ray selected galaxy clusters as part of the Sloan Digital Sky Survey-IV (SDSS-IV). We describe the final data set in the context of SDSS Data Release 16 (DR16): the survey overall characteristics, final targeting strategies, achieved completeness…
V1460 Her: a fast spinning white dwarf accreting from an evolved donor star
Thorstensen, John R.; Gänsicke, B. T.; Pala, A. F. +6 more
We present time-resolved optical and ultraviolet (UV) spectroscopy and photometry of V1460 Her, an eclipsing cataclysmic variable with a 4.99-h orbital period and an overluminous K5-type donor star. The optical spectra show emission lines from an accretion disc along with absorption lines from the donor. We use these to measure radial velocities, …
HST/WFC3 grism observations of z ∼ 1 clusters: evidence for evolution in the mass-size relation of quiescent galaxies from post-starburst galaxies
Demarco, R.; Brammer, G. B.; Matharu, J. +10 more
Minor mergers have been proposed as the driving mechanism for the size growth of quiescent galaxies with decreasing redshift. The process whereby large star-forming galaxies quench and join the quiescent population at the large size end has also been suggested as an explanation for this size growth. Given the clear association of quenching with cl…
A complete view of the outskirts of the Coma cluster
Walker, S. A.; Mirakhor, M. S.
We present a new extended XMM-Newton mosaic of the nearby Coma cluster, which covers the cluster out to the virial radius with nearly complete azimuthal coverage. This large mosaic is combined with the Planck Sunyaev Zel'dovich effect observations to recover the thermodynamic properties of the intracluster medium in an azimuthally averaged profile…
Updated theoretical period-age and period-age-colour relations for Galactic Classical Cepheids: an application to the Gaia DR2 sample
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +4 more
Updated evolutionary and pulsational model predictions are combined in order to interpret the properties of Galactic Classical Cepheids in the Gaia Data Release 2. In particular, the location of the instability strip boundaries and the analytical relations connecting pulsation periods to the intrinsic stellar parameters are combined with evolution…
Lyman Continuum Escape Fraction from Low-mass Starbursts at z = 1.3
Teplitz, Harry I.; Scarlata, Claudia; Henry, Alaina +8 more
We present a new constraint on the Lyman continuum (LyC) escape fraction at $z\sim 1.3$ . We obtain deep, high sensitivity far-UV imaging with the Advanced Camera for Surveys Solar Blind Channel on the Hubble Space Telescope, targeting 11 star-forming galaxies at 1.2 < z < 1.4. The galaxies are selected from the 3D-HST survey to have high Hα…