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Stars that Move Together Were Born Together
Conroy, Charlie; Ting, Yuan-Sen; Brown, Anthony G. A. +3 more
It is challenging to reliably identify stars that were born together outside of actively star-forming regions and bound stellar systems. However, conatal stars should be present throughout the Galaxy, and their demographics can shed light on the clustered nature of star formation and the dynamical state of the disk. In previous work we presented a…
A Triple AGN in a Mid-infrared Selected Late-stage Galaxy Merger
Ellison, Sara L.; Ricci, Claudio; Blecha, Laura +11 more
The coevolution of galaxies and the supermassive black holes (SMBHs) at their centers via hierarchical galaxy mergers is a key prediction of ΛCDM cosmology. As gas and dust are funneled to the SMBHs during the merger, the SMBHs light up as active galactic nuclei (AGNs). In some cases, a merger of two galaxies can encounter a third galaxy, leading …
Constraining nuclear star cluster formation using MUSE-AO observations of the early-type galaxy FCC 47
Coccato, Lodovico; Fahrion, Katja; Leaman, Ryan +12 more
Context. Nuclear star clusters (NSCs) are found in at least 70% of all galaxies, but their formation path is still unclear. In the most common scenarios, NSCs form in-situ from the galaxy's central gas reservoir, through the merging of globular clusters (GCs), or through a combination of both.
Aims: As the scenarios pose different expectation…
The mass-loss, expansion velocities, and dust production rates of carbon stars in the Magellanic Clouds
Goldman, Steven R.; Boyer, Martha L.; van Loon, Jacco Th +5 more
The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as a function of the stellar parameters by consistently following the growth for several dust species…
Catalog of quasars from the Kilo-Degree Survey Data Release 3
Brescia, M.; Napolitano, N. R.; Maddox, N. +5 more
We present a catalog of quasars selected from broad-band photometric ugri data of the Kilo-Degree Survey Data Release 3 (KiDS DR3). The QSOs are identified by the random forest (RF) supervised machine learning model, trained on Sloan Digital Sky Survey (SDSS) DR14 spectroscopic data. We first cleaned the input KiDS data of entries with excessively…
The impact of stellar feedback from velocity-dependent ionized gas maps - a MUSE view of Haro 11
Östlin, G.; Hayes, M.; Adamo, A. +6 more
We have used the capability of the Multi-Unit Spectroscopic Explorer (MUSE) instrument to explore the impact of stellar feedback at large scales in Haro 11, a galaxy under extreme starburst condition and one of the first galaxies where Lyman continuum (LyC) has been detected. Using H α, [O III] λ5007, and [O I] λ6300 emission lines from deep MUSE …
NuSTAR and XMM-Newton broad-band spectrum of SAX J1808.4-3658 during its latest outburst in 2015
Sanna, A.; Papitto, A.; Di Salvo, T. +4 more
The first discovered accreting millisecond pulsar, SAX J1808.4-3658, went into X-ray outburst in 2015 April. We triggered a 100 ks XMM-Newton ToO, taken at the peak of the outburst, and a 55 ks NuSTAR ToO, performed 4 d apart. We report here the results of a detailed spectral analysis of both the XMM-Newton and NuSTAR spectra. While the XMM-Newton…
Faint end of the z ∼ 3-7 luminosity function of Lyman-alpha emitters behind lensing clusters observed with MUSE
Laporte, N.; Bauer, F. E.; Bina, D. +21 more
Contact. This paper presents the results obtained with the Multi-Unit Spectroscopic Explorer (MUSE) at the ESO Very Large Telescope on the faint end of the Lyman-alpha luminosity function (LF) based on deep observations of four lensing clusters. The goal of our project is to set strong constraints on the relative contribution of the Lyman-alpha em…
The Red Dead Redemption Survey of Circumgalactic Gas about Massive Galaxies. I. Mass and Metallicity of the Cool Phase
Bowen, David V.; Tejos, Nicolas; Lehner, Nicolas +6 more
We present a search for H I in the circumgalactic medium (CGM) of 21 massive (< {log}{M}\star > ∼ 11.4), luminous red galaxies (LRGs) at z ∼ 0.5. Using UV spectroscopy of QSO sightlines projected within 500 kpc (∼{R}vir}) of these galaxies, we detect H I absorption in 11/21 sightlines, including two partial Lyman limit …
Photochemistry of water in the martian thermosphere and its effect on hydrogen escape
Krasnopolsky, Vladimir A.
Recent SPICAM IR solar occultations reveal significant abundances of water vapor up to ≈80 km near Mars perihelion. These abundances are stimulated by dust that heats the atmosphere and precludes condensation of water. This phenomenon correlates with detections of high escape of hydrogen near perihelion using the H Lyman-alpha in the SPICAM UV and…