Search Publications
Molecular ion abundances in the diffuse ISM: CF+, HCO+, HOC+, and C3H+
Godard, B.; Roueff, E.; Gerin, M. +4 more
Aims: The transition between atomic and molecular hydrogen is associated with important changes in the structure of interstellar clouds, and marks the beginning of interstellar chemistry. Most molecular ions are rapidly formed (in ion-molecule reactions) and destroyed (by dissociative recombination) in the diffuse ISM. Because of the relative…
Cold Giant Planets Evaporated by Hot White Dwarfs
Gänsicke, Boris T.; Schreiber, Matthias R.; Toloza, Odette +2 more
Atmospheric escape from close-in Neptunes and hot Jupiters around Sun-like stars driven by extreme ultraviolet (EUV) irradiation plays an important role in the evolution of exoplanets and in shaping their ensemble properties. Intermediate and low mass stars are brightest at EUV wavelengths at the very end of their lives, after they have expelled t…
Rest-frame far-ultraviolet to far-infrared view of Lyman break galaxies at z = 3: Templates and dust attenuation
Ilbert, O.; Buat, V.; Burgarella, D. +2 more
Aims: This work explores, from a statistical point of view, the rest-frame far-ultraviolet (FUV) to far-infrared (FIR) emission of a population of Lyman-break galaxies (LBGs) at z ∼ 3 that cannot be individually detected from current FIR observations.
Methods: We performed a stacking analysis over a sample of ∼17 000 LBGs at redshift 2.5…
Modeling Mg II h, k and Triplet Lines at Solar Flare Ribbons
Kowalski, Adam F.; Carlsson, Mats; Tian, Hui +3 more
Observations from the Interface Region Imaging Spectrograph often reveal significantly broadened and non-reversed profiles of the Mg II h, k and triplet lines at flare ribbons. To understand the formation of these optically thick Mg II lines, we perform plane-parallel radiative hydrodynamics modeling with the RADYN code, and then recalculate the M…
A Momentum-conserving Accretion Disk Wind in the Narrow-line Seyfert 1 I Zwicky 1
Reeves, J. N.; Braito, V.
I Zwicky 1 (hereafter I Zw 1) is the prototype optical narrow-line Seyfert 1 galaxy. It is also a nearby (z = 0.0611), luminous quasi-stellar object (QSO), accreting close to the Eddington limit. XMM-Newton observations of I Zw 1 in 2015 reveal the presence of a broad and blueshifted P Cygni iron K profile, as observed through a blueshifted absorp…
The XMM-Newton/HST View of the Obscuring Outflow in the Seyfert Galaxy Mrk 335 Observed at Extremely Low X-Ray Flux
Komossa, S.; Mathur, Smita; Krongold, Yair +8 more
The Seyfert galaxy Mrk 335 is known for its frequent changes of flux and spectral shape in the X-ray band that occurred during recent years. These variations may be explained by the onset of a wind that previous, noncontemporaneous high-resolution spectroscopy in X-ray and UV bands located at accretion disk scale. A simultaneous new campaign by XM…
Discrepancies in the ages of young star clusters; evidence for mergers?
Smith, Nathan; Bastian, Nate; Beasor, Emma R. +1 more
There is growing evidence that star clusters can no longer be considered simple stellar populations. Intermediate- and old-age clusters are often found to have extended main-sequence turn-offs (eMSTOs) which are difficult to explain with single-age isochrones, an effect attributed to rotation. In this paper, we provide the first characterization o…
X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
Sanna, A.; Motta, S. E.; Segreto, A. +3 more
MAXI J1820+070, a black hole candidate first detected in early 2018 March, was observed by XMM-Newton during the outburst rise. In this letter we report on the spectral and timing analysis of the XMM-Newton X-ray and UV data, as well as contemporaneous X-ray data from the Swift satellite. The X-ray spectrum is well described by a hard thermal Comp…
Discovery of disc truncations above the galaxies' mid-plane in Milky Way-like galaxies
Trujillo, Ignacio; Knapen, Johan H.; Martínez-Lombilla, Cristina
Disc truncations are the closest feature to an edge that galaxies have, but the nature of this phenomenon is not yet understood. In this paper we explore the truncations in two nearby (D ∼15 Mpc) Milky Way-like galaxies: NGC 4565 and NGC 5907. We cover a wide wavelength range from the NUV and optical to 3.6 {µ m}. We find that the radius of …
WISDOM project - IV. A molecular gas dynamical measurement of the supermassive black hole mass in NGC 524
Sarzi, Marc; Cappellari, Michele; Davis, Timothy A. +6 more
We present high angular resolution (0.3 arcsec or 37 pc) Atacama Large Millimeter/submillimeter Array observations of the CO(2-1) line emission from a central disc in the early-type galaxy NGC 524. This disc is shown to be dynamically relaxed, exhibiting ordered rotation about a compact 1.3 mm continuum source, which we identify as emission from a…