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Planck's dusty GEMS. III. A massive lensing galaxy with a bottom-heavy stellar initial mass function at z = 1.5
Kneissl, R.; Le Floc'h, E.; Dole, H. +8 more
We study the properties of the foreground galaxy of the Ruby, the brightest gravitationally lensed high-redshift galaxy on the sub-millimeter sky as probed by the Planck satellite, and part of our sample of Planck's dusty GEMS. The Ruby consists of an Einstein ring of 1.4'' diameter at z = 3.005 observed with ALMA at 0.1'' resolution, centered on …
Modeling Type II-P/II-L Supernovae Interacting with Recent Episodic Mass Ejections from Their Presupernova Stars with MESA and SNEC
Das, Sanskriti; Ray, Alak
We show how dense, compact, discrete shells of circumstellar gas immediately outside of red supergiants affect the optical light curves of Type II-P/II-L supernovae (SNe), using the example of SN 2013ej. Earlier efforts in the literature had used an artificial circumstellar medium (CSM) stitched to the surface of an evolved star that had not gone …
Herschel Observations in the Akari NEP Field: Initial Source Counts
Burgarella, Denis; Pearson, Chris; Serjeant, Stephen +7 more
Detection of faint broad emission lines in type 2 AGN - I. Near-infrared observations and spectral fitting
Maiolino, R.; Fiore, F.; Bianchi, S. +8 more
We present medium resolution near-infrared spectroscopic observations of 41 obscured and intermediate class active galactic nuclei (AGN; type 2, 1.9 and 1.8; AGN2) with redshift z ≲ 0.1, selected from the Swift/Burst Alert Telescope 70-month catalogue. The observations have been carried out in the framework of a systematic study of the AGN2 near-i…
Imaging Observations of the Hydrogen Coma of Comet 67P/Churyumov-Gerasimenko in 2015 September by the PROCYON/LAICA
Combi, Michael R.; Shinnaka, Yoshiharu; Fougere, Nicolas +8 more
The water production rate of a comet is one of the fundamental parameters necessary to understand cometary activity when a comet approaches the Sun within 2.5 au, because water is the most abundant icy material in the cometary nucleus. Wide-field imaging observations of the hydrogen Lyα emission in comet 67P/Churyumov-Gerasimenko were performed by…
IFU spectroscopy of southern planetary nebulae IV: a physical model for IC 418
Ali, A.; Dopita, M. A.; Sutherland, R. S. +2 more
We describe high spectral resolution, high dynamic range integral field spectroscopy of IC 418 covering the spectral range 3300-8950 Å and compare with earlier data. We determine line fluxes, derive chemical abundances, provide a spectrum of the central star and determine the shape of the nebular continuum. Using photoionization models, we derive …
The Evolution of Star formation Activity in Cluster Galaxies over 0.15 < z < 1.5
Stanford, S. A.; Stern, Daniel; Snyder, Gregory F. +3 more
We explore 7.5 billion years of evolution in the star formation activity of massive ({M}\star > {10}10.1 {M}⊙ ) cluster galaxies using a sample of 25 clusters over 0.15< z< 1 from the Cluster Lensing And Supernova survey with Hubble and 11 clusters over 1< z< 1.5 from the IRAC Shallow Cluster Survey.…
PTF11kx: A Type Ia Supernova with Hydrogen Emission Persisting after 3.5 Years
Fox, O. D.; Filippenko, A. V.; Nugent, P. E. +4 more
The optical transient PTF11kx exhibited both the characteristic spectral features of Type Ia supernovae (SNe Ia) and the signature of ejecta interacting with circumstellar material (CSM) containing hydrogen, indicating the presence of a nondegenerate companion. We present an optical spectrum at 1342 days after peak from Keck Observatory, in which …
A three-dimensional modelling of the layered structure of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +53 more
We provide a three-dimensional model of the inner layered structure of comet 67P based on the hypothesis of an extended layering independently wrapping each lobe. A large set of terrace orientations was collected on the latest shape model and then used as a proxy for the local orientation of the surfaces of discontinuity which defines the layers. …
The nature of 50 Palermo Swift-BAT hard X-ray objects through optical spectroscopy
Palazzi, E.; Minniti, D.; Masetti, N. +16 more
We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy campaign performed at seven telescopes in the northern and southern hemispheres. These objects were detected with the Burst Alert Telescope (BAT) instrument onboard the Swift satellite and listed as of unidentified nature in the 54-month Palermo BAT ca…