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The HST Large Programme on NGC 6752 - II. Multiple populations at the bottom of the main sequence probed in NIR
Salaris, M.; Apai, D.; Anderson, J. +12 more
Historically, multiple populations in globular clusters (GCs) have been mostly studied from ultraviolet and optical filters down to stars that are more massive than ∼0.6 M_{\odot }. Here, we exploit deep near-infrared (NIR) photometry from the Hubble Space Telescope to investigate multiple populations among M-dwarfs in the GC NGC 6752. We discover…
Evolution of galactic planes of satellites in the EAGLE simulation
Frenk, Carlos S.; Cautun, Marius; Shao, Shi
We study the formation of planes of dwarf galaxies around Milky Way (MW)-mass haloes in the EAGLE galaxy formation simulation. We focus on satellite systems similar to the one in the MW: spatially thin or with a large fraction of members orbiting in the same plane. To characterize the latter, we introduce a robust method to identify the subsets of…
Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-line Holiday in NGC 5548
Brandt, W. N.; Knigge, C.; Kriss, G. A. +27 more
The Space Telescope and Optical Reverberation Mapping Project (AGN STORM) on NGC 5548 in 2014 is one of the most intensive multiwavelength AGN monitoring campaigns ever. For most of the campaign, the emission-line variations followed changes in the continuum with a time lag, as expected. However, the lines varied independently of the observed UV-o…
The Relationship between Galaxy ISM and Circumgalactic Gas Metallicities
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +3 more
We present interstellar matter (ISM) and circumgalactic medium (CGM) metallicities for 25 absorption systems associated with isolated star-forming galaxies (≤ft< z\right> =0.28) with 9.4 ≤ log(M */M ⊙) ≤ 10.9 and with absorption detected within (200 kpc). Galaxy ISM metallicities were measured using Hα/[N II] emission l…
A survey of water production in 61 comets from SOHO/SWAN observations of hydrogen Lyman-alpha: Twenty-one years 1996-2016
Bertaux, J. -L.; Combi, M. R.; Quémerais, E. +2 more
The Solar Wind Anisotropies (SWAN) instrument on the SOlar and Heliospheric Observatory (SOHO) satellite has observed 44 long period and new Oort cloud comets and 36 apparitions of 17 short period comets since its launch in December 1995. Water production rates have been determined from the over 3700 images producing a consistent set of activity v…
Complex Rotational Modulation of Rapidly Rotating M Stars Observed with TESS
Dai, F.; Rowden, P.; Seager, S. +23 more
We have searched for short periodicities in the light curves of stars with T eff cooler than 4000 K made from 2-minute cadence data obtained in Transiting Exoplanet Survey Satellite sectors 1 and 2. Herein we report the discovery of 10 rapidly rotating M dwarfs with highly structured rotational modulation patterns among 371 M dwarfs fou…
Demonstration of Magnetic Field Tomography with Starlight Polarization toward a Diffuse Sightline of the ISM
Tassis, Konstantinos; Potter, Stephen B.; Liodakis, Ioannis +7 more
The availability of large data sets with stellar distance and polarization information will enable a tomographic reconstruction of the (plane-of-the-sky-projected) interstellar magnetic field in the near future. We demonstrate the feasibility of such a decomposition within a small region of the diffuse interstellar medium (ISM). We combine measure…
The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
Testi, L.; Tazzari, M.; Williams, J. P. +10 more
Context. The cyanide radical CN is abundant in protoplanetary disks, with line fluxes often comparable to those of 13CO. It is known to be sensitive to UV irradiation of the upper disk atmosphere, with models predicting ring-shaped emission.
Aims: We seek to characterize the CN emission from 94 Class-II disks in the Lupus star-form…
SOFIA mid-infrared observations of Supernova 1987A in 2016 - forward shocks and possible dust re-formation in the post-shocked region
Matsuura, Mikako; Barlow, M. J.; Meixner, Margaret +10 more
The equatorial ring of Supernova (SN) 1987A has been exposed to forward shocks from the SN blast wave, and it has been suggested that these forward shocks have been causing ongoing destruction of dust in the ring. We obtained Stratospheric Observatory For Infrared Astronomy The Faint Object InfraRed CAmera for the SOFIA Telescope (FORCAST) 11.1, 1…
H-band discovery of additional second-generation stars in the Galactic bulge globular cluster NGC 6522 as observed by APOGEE and Gaia
Schultheis, M.; Minniti, D.; Souto, Diogo +34 more
We present an elemental abundance analysis of high-resolution spectra for five giant stars spatially located within the innermost regions of the bulge globular cluster NGC 6522 and derive Fe, Mg, Al, C, N, O, Si, and Ce abundances based on H-band spectra taken with the multi-object APOGEE-north spectrograph from the SDSS-IV Apache Point Observator…