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Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies
Skillman, Evan D.; Erb, Dawn K.; Berg, Danielle A. +2 more
The study of carbon and oxygen abundances yields information on the time evolution and nucleosynthetic origins of these elements, yet they remain relatively unexplored. At low metallicities, (12+log(O/H) < 8.0), nebular carbon measurements are limited to rest-frame UV collisionally excited emission lines. Therefore, we present the UV spectropho…
No Thermal Inversion and a Solar Water Abundance for the Hot Jupiter HD 209458b from HST/WFC3 Spectroscopy
Madhusudhan, Nikku; Fortney, Jonathan J.; Stevenson, Kevin B. +6 more
The nature of the thermal structure of hot Jupiter atmospheres is one of the key questions raised by the characterization of transiting exoplanets over the past decade. There have been claims that many hot Jupiters exhibit atmospheric thermal inversions. However, these claims have been based on broadband photometry rather than the unambiguous iden…
The Shape of the Inner Milky Way Halo from Observations of the Pal 5 and GD--1 Stellar Streams
Bovy, Jo; Kallivayalil, Nitya; Fritz, Tobias K. +1 more
We constrain the shape of the Milky Way’s halo by dynamical modeling of the observed phase-space tracks of the Pal 5 and GD-1 tidal streams. We find that the only information about the potential gleaned from the tracks of these streams are precise measurements of the shape of the gravitational potential—the ratio of vertical to radial acceleration…
Mass Measurements in Protoplanetary Disks from Hydrogen Deuteride
Henning, Th.; van Dishoeck, E. F.; Pontoppidan, K. M. +8 more
The total gas mass of a protoplanetary disk is a fundamental, but poorly determined, quantity. A new technique has been demonstrated to assess directly the bulk molecular gas reservoir of molecular hydrogen using the HD J = 1-0 line at 112 µm. In this work we present a Herschel Space Observatory 10 survey of six additional T Tauri…
Planck intermediate results. XXXII. The relative orientation between the magnetic field and structures traced by interstellar dust
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +201 more
The role of the magnetic field in the formation of the filamentary structures observed in the interstellar medium (ISM) is a debated topic owing to the paucity of relevant observations needed to test existing models. The Planck all-sky maps of linearly polarized emission from dust at 353 GHz provide the required combination of imaging and statisti…
Masses and scaling relations for nuclear star clusters, and their co-existence with central black holes
Lützgendorf, Nora; Böker, Torsten; Neumayer, Nadine +2 more
Galactic nuclei typically host either a Nuclear Star Cluster (NSC, prevalent in galaxies with masses $\lesssim 10^{10}M_\odot$) or a Massive Black Hole (MBH, common in galaxies with masses $\gtrsim 10^{12}M_\odot$). In the intermediate mass range, some nuclei host both a NSC and a MBH. In this paper, we explore scaling relations between NSC mass (…
Reconciling CMB and structure growth measurements with dark energy interactions
Pourtsidou, Alkistis; Tram, Thomas
We study a coupled quintessence model with pure momentum exchange and present the effects of such an interaction on the cosmic microwave background (CMB) and matter power spectrum. For a wide range of negative values of the coupling parameter β structure growth is suppressed and the model can reconcile the tension between cosmic microwave backgrou…
Galaxy And Mass Assembly (GAMA): Panchromatic Data Release (far-UV-far-IR) and the low-z energy budget
Holwerda, Benne W.; Wilkins, Stephen M.; Conselice, Christopher J. +63 more
We present the Galaxy And Mass Assembly (GAMA) Panchromatic Data Release (PDR) constituting over 230 deg2 of imaging with photometry in 21 bands extending from the far-UV to the far-IR. These data complement our spectroscopic campaign of over 300k galaxies, and are compiled from observations with a variety of facilities including: GALax…
Evidence for dark matter interactions in cosmological precision data?
Lesgourgues, Julien; Marques-Tavares, Gustavo; Schmaltz, Martin
We study a two-parameter extension of the cosmological standard model ΛCDM in which cold dark matter interacts with a new form of dark radiation. The two parameters correspond to the energy density in the dark radiation fluid ΔNfluid and the interaction strength between dark matter and dark radiation. The interactions give rise to a ver…
A quasi-periodic modulation of the iron line centroid energy in the black hole binary H1743-322
Ingram, Adam; Done, Chris; Middleton, Matthew +5 more
Accreting stellar-mass black holes often show a `Type-C' quasi-periodic oscillation (QPO) in their X-ray flux and an iron emission line in their X-ray spectrum. The iron line is generated through continuum photons reflecting off the accretion disc, and its shape is distorted by relativistic motion of the orbiting plasma and the gravitational pull …