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Spatially resolved spectroscopy of close massive visual binaries with HST/STIS. I. Seven O-type systems
Maíz Apellániz, J.; Barbá, R. H.
Context. The spectroscopic characterization of many O-type stars is hampered by a nearby companion.
Aims: We want to obtain spatially resolved spectroscopy of close O-type visual binaries to derive their spectral types.
Methods: We used the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) to obtain long-sli…
Radial variation of the stellar mass functions in the globular clusters M15 and M30: clues of a non-standard IMF?
Dalessandro, E.; Monaco, L.; Beccari, G. +5 more
We exploit a combination of high-resolution Hubble Space Telescope and wide-field ESO-VLT observations to study the slope of the global mass function (αG) and its radial variation (α(r)) in the two dense, massive and post core-collapse globular clusters M15 and M30. The available data set samples the clusters' main sequence down to ∼0.2…
Rest-frame UV properties of luminous strong gravitationally lensed Lyα emitters from the BELLS GALLERY Survey
Pérez-Fournon, I.; Poidevin, F.; Shirley, R. +15 more
We present deep rest-frame UV spectroscopic observations using the Gran Telescopio Canarias of six gravitationally lensed Lyα emitters (LAEs) at 2.36 < z < 2.82 selected from the BELLS GALLERY survey. By taking the magnifications into account, we show that LAEs can be as luminous as LLyα ≃ 30 × 1042 erg s-1 a…
The Ionized- and Cool-gas Content of the BR1202-0725 System as Seen by MUSE and ALMA
Walter, F.; Riechers, D.; Decarli, R. +7 more
We present Multi Unit Spectroscopic Explorer (MUSE) observations of the gas-rich major merger BR1202-0725 at z ∼ 4.7, which constitutes one of the most overdense fields known in the early universe. We utilize these data in conjunction with existing Atacama Large Millimeter/submillimeter Array (ALMA) observations to compare and contrast the spatial…
Drift-Bounce Resonance Between Charged Particles and Ultralow Frequency Waves: Theory and Observations
Zong, Qiu-Gang; Liu, Ying; Zhang, Shuai +7 more
Ultralow frequency (ULF) waves have long been known to resonate with magnetospheric charged particles through their drift and bounce motions. Most research interest has focused on the resonance with drift motion, which can accelerate charged particles at very high energies. The role of the bounce motion, especially for particles with lower energie…
Plasma Diagnostics of the Supernova Remnant N132D using Deep XMM-Newton Observations with the Reflection Grating Spectrometer
Miller, Eric D.; Ishida, Manabu; Yamaguchi, Hiroya +4 more
We present XMM-Newton observations of N132D, the X-ray brightest supernova remnant in the Large Magellanic Cloud, using the Reflection Grating Spectrometer (RGS), which enables high-resolution spectroscopy in the soft X-ray band. A dozen emission lines from L-shell transitions of Si, S, Ar, Ca, and Fe at intermediate charge states are newly detect…
Chandra reveals a luminous Compton-thick QSO powering a Lyα blob in a z = 4 starbursting protocluster
Ivison, R. J.; Lehmer, B. D.; Bauer, F. E. +7 more
Context. Galaxy clusters in the local universe descend from high-redshift overdense regions known as protoclusters. The large gas reservoirs and high rate of galaxy interaction in protoclusters are expected to enhance star-formation activity and trigger luminous supermassive black-hole accretion in the nuclear regions of the host galaxies.
Ai…
Observations and Modeling of the Onset of Fast Reconnection in the Solar Transition Region
Peter, H.; De Pontieu, Bart; Huang, Y. -M. +2 more
Magnetic reconnection is a fundamental plasma process that plays a critical role not only in energy release in the solar atmosphere, but also in fusion, astrophysics, and other space plasma environments. One of the challenges in explaining solar observations in which reconnection is thought to play a critical role is to account for the transition …
Discarding the disc in a changing-state AGN: the UV/X-ray relation in NGC 4151
Done, Chris; Mahmoud, Ra'ad D.
Recent monitoring campaigns designed to map the accretion regime in active galactic nuclei (AGN) show major discrepancies with models where the optical/ultraviolet (UV) is produced by X-ray-illuminated, optically thick disc material within a few hundred gravitational radii. However, these campaigns only monitored X-rays below 10 keV, whereas the b…
Young stars as tracers of a barred-spiral Milky Way
Ragan, Sarah E.; Pettitt, Alex R.; Smith, Martin C.
Identifying the structure of our Galaxy has always been fraught with difficulties, and while modern surveys continue to make progress building a map of the Milky Way, there is still much to understand. The arm and bar features are important drivers in shaping the interstellar medium (ISM), but their exact nature and influence still require attenti…