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Using [C II] 158 µm Emission from Isolated ISM Phases as a Star Formation Rate Indicator
Hunt, Leslie K.; Calzetti, Daniela; Bolatto, Alberto D. +17 more
The brightest observed emission line in many star-forming galaxies is the [{{C}} {{II}}] 158 µm line, making it detectable up to z ∼ 7. In order to better understand and quantify the [{{C}} {{II}}] emission as a tracer of star formation, the theoretical ratio between the [{{N}} {{II}}] 205 µm emission and the [{{C}} {{II}}] 158 µ…
New Nearby Hypervelocity Stars and Their Spatial Distribution from Gaia DR2
Shi, Jianrong; Chen, Yuqin; Ma, Jun +5 more
Based on about 4500 large tangential velocity (V tan > 0.75V esc) with high-precision proper motions and 5σ parallaxes in Gaia data release 2 (DR2) 5D information derived from parallax and proper motion, we identify more than 600 high-velocity stars with a 50% unbound probability. Of these, 28 nearby (less than 6 kpc) late…
A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205)
Arellano Ferro, A.; Calderón, J. H.; Lázaro, C. +4 more
We present the results from VI CCD time-series photometry of the globular cluster M13 (NGC 6205). From the Fourier decomposition of the light curves of RRab and RRc stars we found an average metallicity of [Fe/H]zw = -1.58 ± 0.09. The distance to the cluster was estimated as 7.1 ± 0.1 kpc from independent methods related to the variable star famil…
Rediscovery of the Sixth Star Cluster in the Fornax Dwarf Spheroidal Galaxy
Bacon, D.; Bechtol, K.; Wang, M. Y. +60 more
Since first noticed by Shapley in 1939, a faint object coincident with the Fornax dwarf spheroidal has long been discussed as a possible sixth globular cluster (GC) system. However, debate has continued over whether this overdensity is a statistical artifact or a blended galaxy group. In this Letter we demonstrate, using deep DECam imaging data, t…
60Fe in core-collapse supernovae and prospects for X-ray and gamma-ray detection in supernova remnants
Safi-Harb, Samar; Fryer, Chris L.; Mumpower, Matthew R. +6 more
We investigate 60Fe in massive stars and core-collapse supernovae focussing on uncertainties that influence its production in 15, 20, and 25 M⊙ stars at solar metallicity. We find that the 60Fe yield is a monotonic increasing function of the uncertain 59Fe(n, γ)60Fe cross-section and that a fa…
A New Generation of Cool White Dwarf Atmosphere Models. III. WD J2356-209: Accretion of a Planetesimal with an Unusual Composition
Rich, R. M.; Koopmans, L. V. E.; Dufour, P. +3 more
WD J2356-209 is a cool metal-polluted white dwarf whose visible spectrum is dominated by a strong and broad sodium feature. Although it was discovered nearly two decades ago, no detailed and realistic analysis of this star had yet been realized. In the absence of atmosphere models taking into account the nonideal high-density effects arising at th…
Surviving companions of Type Ia supernovae: theory and observations
Ruiz-Lapuente, Pilar
We review the theoretical background and the observational searches made for surviving companions of Type Ia supernovae (SNe Ia). Theory comprises the characteristics of the stellar binary companions of the exploding white dwarfs at the time of the supernova outburst and the expected effects on them of the explosion, as well as their subsequent ev…
WASP-166b: a bloated super-Neptune transiting a V = 9 star
Bouchy, F.; Queloz, D.; Hellier, Coel +21 more
We report the discovery of WASP-166b, a super-Neptune planet with a mass of 0.1 MJup (1.9 MNep) and a bloated radius of 0.63 RJup. It transits a V = 9.36, F9V star in a 5.44-d orbit that is aligned with the stellar rotation axis (sky-projected obliquity angle λ = 3 ± 5 deg). Variations in the radial-velocity measur…
A Dramatic Decrease in Carbon Star Formation in M31
Chen, Y.; Dalcanton, J. J.; Girardi, L. +8 more
We analyze resolved stellar near-infrared photometry of 21 Hubble Space Telescope (HST) fields in M31 to constrain the impact of metallicity on the formation of carbon stars. Observations of nearby galaxies show that carbon stars are increasingly rare at higher metallicity. Models indicate that carbon star formation efficiency drops due to the dec…
Unbiased Differential Size Evolution and the Inside-out Growth of Galaxies in the Deep CANDELS GOODS Fields at 1 ≤ z ≤ 7
Conselice, C. J.; Duncan, K.; Bhatawdekar, R. +1 more
We present a size analysis of a sample of ∼49,000 galaxies from the Cosmic Assembly Near-infrared Deep Extragalactic Survey GOODS North and South fields, using redshift-independent relative surface-brightness metrics to determine an unbiased measure of the differential size evolution of galaxies at 1 ≤ z ≤ 7. We introduce a novel method of removin…