Search Publications
K-CLASH: spatially resolving star-forming galaxies in field and cluster environments at z ≈ 0.2-0.6
Bunker, Andrew; Cappellari, Michele; Bureau, Martin +10 more
We present the KMOS-CLASH (K-CLASH) survey, a K-band Multi-Object Spectrograph (KMOS) survey, of the spatially resolved gas properties and kinematics of 191 (pre-dominantly blue) H α-detected galaxies at 0.2 ≲ z ≲ 0.6 in field and cluster environments. K-CLASH targets galaxies in four Cluster Lensing And Supernova survey with Hubble (CLASH) fields…
Unravelling the enigmatic ISM conditions in Minkowski's object
Groves, Brent; Kewley, Lisa; Mukherjee, Dipanjan +7 more
Local examples of jet-induced star formation lend valuable insight into its significance in galaxy evolution and can provide important observational constraints for theoretical models of positive feedback. Using optical integral field spectroscopy, we present an analysis of the ISM conditions in Minkowski's object (z = 0.0189), a peculiar star-for…
Characterizing brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B
Heng, K.; D'Orazi, V.; Boccaletti, A. +9 more
The determination of the fundamental properties (mass, separation, age, gravity, and atmospheric properties) of brown dwarf companions allows us to infer crucial informations on their formation and evolution mechanisms. Spectroscopy of substellar companions is available to date only for a limited number of objects (and mostly at very low resolutio…
The AGN contribution to the UV-FIR luminosities of interacting galaxies and its role in identifying the main sequence
Smith, Howard A.; Ashby, M. L. N.; Ramos Padilla, Andrés F. +5 more
Emission from active galactic nuclei (AGNs) is known to play an important role in the evolution of many galaxies including luminous and ultraluminous systems (U/LIRGs), as well as merging systems. However, the extent, duration, and exact effects of its influence are still imperfectly understood. To assess the impact of AGNs on interacting systems,…
Birth sites of young stellar associations and recent star formation in a flocculent corrugated disc
Minchev, Ivan; Gagné, Jonathan; Chakrabarti, Sukanya +3 more
With backwards orbit integration, we estimate birth locations of young stellar associations and moving groups identified in the solar neighbourhood that are younger than 70 Myr. The birth locations of most of these stellar associations are at a smaller galactocentric radius than the Sun, implying that their stars moved radially outwards after birt…
A chromosome map to unveil stellar populations with different magnesium abundances. The case of ω Centauri
Milone, A. P.; Cordoni, G.; Marino, A. F. +7 more
Historically, photometry has been largely used to identify stellar populations [multiple populations (MPs)] in globular clusters (GCs) by using diagrams that are based on colours and magnitudes that are mostly sensitive to stars with different metallicities or different abundances of helium, carbon, nitrogen, and oxygen. In particular, the pseudo-…
Blueshifted absorption lines from X-ray reflection in IRAS 13224-3809
Young, A. J.; Fabian, A. C.; Miller, J. M. +17 more
We explore a disc origin for the highly blueshifted, variable absorption lines seen in the X-ray spectrum of the narrow-line Seyfert 1 galaxy IRAS 13224-3809. The blueshift corresponds to a velocity of ∼0.25c. Such features in other active galactic nuclei are often interpreted as ultrafast outflows. The velocity is of course present in the orbital…
A magnetic snapshot survey of F-type stars
Neiner, C.; Folsom, C. P.; Marsden, S. C. +5 more
We present a spectropolarimetric magnetic snapshot survey of 55 stars which includes 53 F-type stars ranging from spectral types F0 to F9 plus 2 chemically peculiar stars β CrB, and δ Cap. We look for magnetic fields in stars spanning a range of effective temperatures where the transition from fossil to dynamo magnetic fields is believed to occur.…
Clumpiness: time-domain classification of red giant evolutionary states
Bell, Keaton J.; Hekker, Saskia; Kuszlewicz, James S.
Long, high-quality time-series data provided by previous space missions such as CoRoT and Kepler have made it possible to derive the evolutionary state of red giant stars, i.e. whether the stars are hydrogen-shell burning around an inert helium core or helium-core burning, from their individual oscillation modes. We utilize data from the Kepler mi…
Time evolution of cyclotron line of Her X-1: a detailed statistical analysis including new AstroSat data
Staubert, R.; Maitra, C.; Bhattacharya, D. +1 more
The cyclotron line feature in the X-ray spectrum of the accretion-powered pulsar Her X-1 has been observed and monitored for over three decades. The line energy exhibited a slow secular decline over the period 1995-2014, with a possible (not confirmed) indication of a reversal thereafter. Recent works have shown that the temporal evolution of the …