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Observing the metal-poor solar neighbourhood: a comparison of galactic chemical evolution predictions*†
Jordan, C.; Soubiran, C.; Korotin, S. A. +15 more
Atmospheric parameters and chemical compositions for 10 stars with metallicities in the region of -2.2 < [Fe/H] < -0.6 were precisely determined using high-resolution, high signal-to-noise, spectra. For each star, the abundances, for 14-27 elements, were derived using both local thermodynamic equilibrium (LTE) and non-LTE (NLTE) approaches. …
Redshifted X-rays from the material accreting onto TW Hydrae: Evidence of a low-latitude accretion spot
Miceli, M.; Orlando, S.; Bonito, R. +3 more
Context. High resolution spectroscopy, providing constraints on plasma motions and temperatures, is a powerful means to investigate the structure of accretion streams in classical T Tauri stars (CTTS). In particular, the accretion shock region, where the accreting material is heated to temperatures of a few million degrees as it continues its inwa…
Detection of a Substantial Molecular Gas Reservoir in a Brightest Cluster Galaxy at z = 1.7
Muzzin, Adam; Yee, H. K. C.; Cybulski, Ryan +7 more
We report the detection of CO(2-1) emission coincident with the brightest cluster galaxy (BCG) of the high-redshift galaxy cluster SpARCS1049+56, with the Redshift Search Receiver (RSR) on the Large Millimeter Telescope (LMT). We confirm a spectroscopic redshift for the gas of z = 1.7091 ± 0.0004, which is consistent with the systemic redshift of …
The Fan Region at 1.5 GHz - I. Polarized synchrotron emission extending beyond the Perseus Arm
Leahy, J. P.; Gaensler, B. M.; McClure-Griffiths, N. M. +12 more
The Fan Region is one of the dominant features in the polarized radio sky, long thought to be a local (distance ≲500 pc) synchrotron feature. We present 1.3-1.8 GHz polarized radio continuum observations of the region from the Global Magneto-Ionic Medium Survey and compare them to maps of Hα and polarized radio continuum intensity from 0.408 to 35…
High-precision optical polarimetry of the accreting black hole V404 Cyg during the 2015 June outburst
Miles-Páez, Paulo A.; Piirola, Vilppu; Tsygankov, Sergey S. +4 more
Our simultaneous three-colour (BVR) polarimetric observations of the low-mass black hole X-ray binary V404 Cyg show a small but statistically significant change of polarization degree (Δp ∼ 1 per cent) between the outburst in 2015 June and the quiescence. The polarization of V404 Cyg in the quiescent state agrees within the errors with that of the…
Constrains on Kähler moduli inflation from reheating
Bhattacharya, Sukannya; Dutta, Koushik; Maharana, Anshuman
We present predictions of the Kähler moduli inflation model for the spectral tilt by parametrizing the reheating epoch by an effective equation-of-state parameter and the number of e-foldings of reheating; and taking into account the post-inflationary history of the model. This model has an epoch in which the energy density of the universe is domi…
Hubble Space Telescope Scattered-light Imaging and Modeling of the Edge-on Protoplanetary Disk ESO-Hα 569
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
We present new Hubble Space Telescope (HST) Advanced Camera for Surveys observations and detailed models for a recently discovered edge-on protoplanetary disk around ESO-Hα 569 (a low-mass T Tauri star in the Cha I star-forming region). Using radiative transfer models, we probe the distribution of the grains and overall shape of the disk (inclinat…
Polygonal ridge networks on Mars: Diversity of morphologies and the special case of the Eastern Medusae Fossae Formation
Head, James W.; Kerber, Laura; Dickson, James L. +1 more
Polygonal ridge networks, also known as boxwork or reticulate ridges, are found in numerous locations and geological contexts across Mars. Distinguishing the morphologies and geological context of the ridge networks sheds light on their potential as astrobiological and mineral resource sites of interest. The most widespread type of ridge morpholog…
Different Accretion Heating of the Neutron Star Crust during Multiple Outbursts in MAXI J0556-332
Homan, Jeroen; Miller, Jon M.; Fridriksson, Joel K. +12 more
The transient neutron star (NS) low-mass X-ray binary MAXI J0556-332 provides a rare opportunity to study NS crust heating and subsequent cooling for multiple outbursts of the same source. We examine MAXI, Swift, Chandra, and XMM-Newton data of MAXI J0556-332 obtained during and after three accretion outbursts of different durations and brightness…
Inferring the photometric and size evolution of galaxies from image simulations. I. Method
Bertin, Emmanuel; Le Borgne, Damien; Carassou, Sébastien +1 more
Context. Current constraints on models of galaxy evolution rely on morphometric catalogs extracted from multi-band photometric surveys. However, these catalogs are altered by selection effects that are difficult to model, that correlate in non trivial ways, and that can lead to contradictory predictions if not taken into account carefully.
Ai…