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Close-up view of a luminous star-forming galaxy at z = 2.95
Berta, S.; Ivison, R. J.; Omont, A. +35 more
Exploiting the sensitivity of the IRAM NOrthern Extended Millimeter Array (NOEMA) and its ability to process large instantaneous bandwidths, we have studied the morphology and other properties of the molecular gas and dust in the star forming galaxy, H-ATLAS J131611.5+281219 (HerBS-89a), at z = 2.95. High angular resolution (0.″3) image…
The Red Supergiant Binary Fraction as a Function of Metallicity in M31 and M33
Neugent, Kathryn F.
Recent work measuring the binary fraction of evolved red supergiants (RSGs) in the Magellanic Clouds points to a value between 15% and 30%, with the majority of the companions being unevolved B-type stars as dictated by stellar evolution. Here I extend this research to the Local Group galaxies M31 and M33 and investigate the RSG binary fraction as…
Bottlenecks to interstellar sulfur chemistry. Sulfur-bearing hydrides in UV-illuminated gas and grains
Goicoechea, J. R.; Riquelme, D.; Fuente, A. +8 more
Hydride molecules lie at the base of interstellar chemistry, but the synthesis of sulfuretted hydrides is poorly understood and their abundances often crudely constrained. Motivated by new observations of the Orion Bar photodissociation region (PDR) - 1″ resolution ALMA images of SH+; IRAM 30 m detections of bright H232<…
The Age of Westerlund 1 Revisited
Smith, Nathan; Gehrz, Robert D.; Figer, Donald F. +2 more
The cluster Westerlund 1 (Wd1) is host to a large variety of post-main-sequence (MS) massive stars. The simultaneous presence of these stars can only be explained by stellar models if the cluster has a finely tuned age of 4-5 Myr, with several published studies independently claiming ages within this range. At this age, stellar models predict that…
Relationship Between the Ozone and Water Vapor Columns on Mars as Observed by SPICAM and Calculated by a Global Climate Model
Forget, F.; Montmessin, F.; Fedorova, A. +10 more
Ozone (O3) in the atmosphere of Mars is produced following the photolysis of CO2 and is readily destroyed by the hydrogen radicals (HOx) released by the photolysis and oxidation of water vapor. As a result, an anti correlation between ozone and water vapor is expected. We describe here the O3 H2
The Sun's dynamic extended corona observed in extreme ultraviolet
Seaton, Daniel B.; Caspi, Amir; Slater, Gregory +6 more
The `middle corona' is a critical transition between the highly disparate physical regimes of the lower and outer solar coronae. Nonetheless, it remains poorly understood due to the difficulty of observing this faint region (1.5-3 R⊙). New observations from the Solar Ultraviolet Imager of a Geostationary Operational Environmental Satell…
A new lepto-hadronic model applied to the first simultaneous multiwavelength data set for Cygnus X-1
Bremer, M.; Wilms, J.; Uttley, P. +10 more
Cygnus X-1 is the first Galactic source confirmed to host an accreting black hole. It has been detected across the entire electromagnetic spectrum from radio to GeV gamma-rays. The source's radio through mid-infrared radiation is thought to originate from the relativistic jets. The observed high degree of linear polarization in the MeV X-rays sugg…
TESS Data for Asteroseismology: Photometry
Huber, Daniel; Jenkins, Jon M.; Pope, Benjamin J. S. +12 more
Over the last two decades, asteroseismology has increasingly proven to be the observational tool of choice for the study of stellar physics, aided by the high quality of data available from space-based missions such as CoRoT, Kepler, K2, and the Transiting Exoplanet Survey Satellite (TESS). TESS in particular will produce more than an order of mag…
GIARPS High-resolution Observations of T Tauri stars (GHOsT). III. A pilot study of stellar and accretion properties
Munari, U.; Alcalá, J. M.; Manara, C. F. +8 more
The mass-accretion rate, Ṁacc, is a crucial parameter for the study of the evolution of accretion disks around young low-mass stellar objects (YSOs) and for planet formation studies. The Taurus star forming region (SFR) is rich in pre-main sequence stars, most of them of the T Tauri class. A variety of methodologies have been used in th…
A Solid Interpretation of Bright Radar Reflectors Under the Mars South Polar Ice
Smith, I. B.; Horgan, B. H. N.; Whitten, J. L. +4 more
Bright radar reflections observed beneath the south polar layered deposits (SPLD) by the Mars Advanced Radar for Subsurface and Ionosphere Sounding instrument were interpreted to represent liquid water, but the required amounts of salt and heat to form and maintain liquids in this location are implausible given what is known about Mars. Here, we p…