Search Publications
FIGS: spectral fitting constraints on the star formation history of massive galaxies since the cosmic noon
Finkelstein, Steven L.; Pirzkal, Nor; Hathi, Nimish +16 more
We constrain the stellar population properties of a sample of 52 massive galaxies - with stellar mass log (Ms/M⊙) ≳ 10.5 - over the redshift range 0.5 < z < 2 by use of observer-frame optical and near-infrared slitless spectra from Hubble Space Telescope's ACS and WFC3 grisms. The deep exposures (∼100 ks) allow us to ta…
The search campaign to identify and image the Philae Lander on the surface of comet 67P/Churyumov-Gerasimenko
Sierks, H.; Güttler, C.; Deller, J. +30 more
On the 12th of November 2014, the Rosetta Philae Lander descended to make the first soft touchdown on the surface of a comet - comet 67P/Churyumov-Gerasimenko. That soft touchdown did occur but due to the failure in the firing of its two harpoons, Philae bounced and travelled across the comet making contact with the surface twice more before final…
Dynamical Masses for the Hyades Binary 80 Tauri
Torres, Guillermo
The empirical mass-luminosity relation in the Hyades cluster rests on dynamical mass determinations for five binary systems, of which one is eclipsing and the other four are visual or interferometric binaries. The last one was identified and first measured more than 20 yr ago. Here we present dynamical mass measurements for a new binary system in …
Active Galactic Nuclei in Dusty Starbursts at z = 2: Feedback Still to Kick in
Daddi, E.; Rodighiero, G.; Rujopakarn, W. +18 more
We investigate a sample of 152 dusty sources at 1.5 < z < 2.5 to understand the connection of enhanced star formation rate (SFR) and black hole accretion rate. The sources are Herschel-selected, having stellar masses M * > 1010 M ⊙ and SFR (∼100-1000 M ⊙ yr-1) elevated (>4×) above …
SLUG IV: a novel forward-modelling method to derive the demographics of star clusters
Calzetti, Daniela; Fumagalli, Michele; Adamo, Angela +1 more
We describe a novel method for determining the demographics of a population of star clusters, for example distributions of cluster mass and age, from unresolved photometry. This method has a number of desirable properties: it fully exploits all the information available in a data set without any binning, correctly accounts for both measurement err…
Discovery of a diffuse optical line emitting halo in the core of the Centaurus cluster of galaxies: line emission outside the protection of the filaments
Fabian, A. C.; Combes, F.; Salomé, P. +6 more
We present the discovery of diffuse optical line emission in the Centaurus cluster seen with the MUSE (Multi Unit Spectroscopic Explorer) integral field unit. The unparalleled sensitivity of MUSE allows us to detect the faint emission from these structures which extend well beyond the bounds of the previously known filaments. Diffuse structures (e…
Stellar Pulsation and the Production of Dust and Molecules in Galactic Carbon Stars
McDonald, Iain; Sloan, G. C.; Groenewegen, Martin A. T. +3 more
New infrared spectra of 33 Galactic carbon stars from FORCAST on SOFIA reveal strong connections between stellar pulsations and the dust and molecular chemistry in their circumstellar shells. A sharp boundary in overall dust content, which predominantly measures the amount of amorphous carbon, separates the semiregular and Mira variables, with the…
Towards an informed quest for accretion disc winds in quasars: the intriguing case of Ton 28
Nardini, E.; Lusso, E.; Bisogni, S.
We report on the detection of a blueshifted Fe K absorption feature in two consecutive XMM-Newton observations of the luminous blue quasar Ton 28, at the 4σ cumulative significance. The rest energy of 9.2 keV implies the presence of an accretion disc wind with bulk outflow velocity of ∼0.28c, while the kinetic power is most likely a few per cent o…
The Time-domain Spectroscopic Survey: Radial Velocity Variability in Dwarf Carbon Stars
Roulston, Benjamin R.; Green, Paul J.; Anderson, Scott F. +6 more
Dwarf carbon (dC) stars (main-sequence stars showing carbon molecular bands) were initially thought to be an oxymoron because only asymptotic giant branch (AGB) stars dredge carbon into their atmospheres. Mass transfer from a former AGB companion that has since faded to a white dwarf seems the most likely explanation. Indeed, a few types of giants…
Formation of disc galaxies around z ∼ 2
Sachdeva, Sonali; Gogoi, Rupjyoti; Saha, Kanak +2 more
We present combined evolution of morphological and stellar properties of galaxies on the two sides of z = 2 (2.0 < z < 4.0 and 1.5 < z < 2.0) in CDFS, with ground-based spectroscopic redshifts. We perform bulge-disc decomposition on their images in J and H filters, from the 3DHST Legacy Survey obtained using HST/WFC3. Combining morphol…