Search Publications
The Relation between [O III]/Hβ and Specific Star Formation Rate in Galaxies at z ∼ 2
van Dokkum, Pieter G.; Franx, Marijn; Leja, Joel +7 more
Recent surveys have identified a seemingly ubiquitous population of galaxies with elevated [O III]/Hβ emission line ratios at z > 1, although the nature of this phenomenon continues to be debated. The [O III]/Hβ line ratio is of interest because it is a main component of the standard diagnostic tools used to differentiate between active galacti…
Star formation towards the southern cometary H II region IRAS 17256-3631
Chandrasekhar, T.; Vig, S.; Ghosh, S. K. +4 more
IRAS 17256-3631 is a southern Galactic massive star-forming region located at a distance of 2 kpc. In this paper, we present a multiwavelength investigation of the embedded cluster, the H II region, as well as the parent cloud. Radio images at 325, 610 and 1372 MHz were obtained using Giant Metrewave Radio Telescope, India while the near-infrared …
Updated galactic radio constraints on Dark Matter
Cirelli, Marco; Taoso, Marco
We perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. We consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. We then confront these signals with radio and microwave maps, including Planck measurements, from a frequen…
Spectroscopic study of the HgMn star HD 49606: the quest for binarity, abundance stratifications and magnetic field
Giarrusso, M.; Leone, F.; Scalia, C. +4 more
In this paper, we present a multi-instrument analysis of the mercury-manganese star HD 49606. New spectroscopic observations have been obtained by us with Catania Astrophysical Observatory Spectropolarimeter (CAOS@OAC) and High Accuracy Radial Velocity Planet Searcher-North@Telescopio Nazionale Galileo (HARPS-N@TNG). Combining these observations w…
Anomalous temporal behaviour of broadband Lyα observations during solar flares from SDO/EVE
Chamberlin, Phillip C.; Milligan, Ryan O.
Although it is the most prominent emission line in the solar spectrum, there has been a notable lack of studies devoted to variations in Lyα emission during solar flares in recent years. However, the few examples that do exist have shown Lyα emission to be a substantial radiator of the total energy budget of solar flares (of the order of 10%). It …
On the Connection between Propagating Solar Coronal Disturbances and Chromospheric Footpoints
De Pontieu, B.; Bryans, P.; McIntosh, S. W. +1 more
The Interface Region Imaging Spectrograph (IRIS) provides an unparalleled opportunity to explore the (thermal) interface between the chromosphere, transition region, and the coronal plasma observed by the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO). The SDO/AIA observations of coronal loop footpoints show strong recu…
Near-infrared Spectroscopy of the Y0 WISEP J173835.52+273258.9 and the Y1 WISE J035000.32-565830.2: The Importance of Non-equilibrium Chemistry
Tremblin, P.; Saumon, D.; Morley, Caroline V. +5 more
We present new near-infrared spectra, obtained at Gemini Observatory, for two Y dwarfs: WISE J035000.32-565830.2 (W0350) and WISEP J173835.52+273258.9 (W1738). A FLAMINGOS-2 R = 540 spectrum was obtained for W0350, covering 1.0\lt λ µ {{m}} \lt 1.7, and a cross-dispersed Gemini near-infrared spectrograph R = 2800 spectrum was obtained for W1…
H-ATLAS/GAMA: the nature and characteristics of optically red galaxies detected at submillimetre wavelengths
Cooray, A.; Hony, S.; De Zotti, G. +39 more
We combine Herschel/SPIRE submillimetre (submm) observations with existing multiwavelength data to investigate the characteristics of low-redshift, optically red galaxies detected in submm bands. We select a sample of galaxies in the redshift range 0.01 ≤ z ≤ 0.2, having >5σ detections in the SPIRE 250 µm submm waveband. Sources are then …
Properties of Magnetic Tongues over a Solar Cycle
Démoulin, Pascal; Mandrini, Cristina H.; López Fuentes, Marcelo +1 more
The photospheric spatial distribution of the main magnetic polarities of bipolar active regions (ARs) present during their emergence deformations are known as magnetic tongues. They are attributed to the presence of twist in the toroidal magnetic-flux tubes that form the ARs. The aim of this article is to study the twist of newly emerged ARs from …
Population of post-nova supersoft X-ray sources
Gilfanov, Marat; Bildsten, Lars; Soraisam, Monika D. +1 more
Novae undergo a supersoft X-ray phase of varying duration after the optical outburst. Such transient post-nova supersoft X-ray sources (SSSs) are the majority of the observed SSSs in M31. In this paper, we use the post-nova evolutionary models of Wolf et al. to compute the expected population of post-nova SSSs in M31. We predict that depending on …