Search Publications
Tracing the kinematics of the whole ram-pressure-stripped tails in ESO 137-001
Fumagalli, Michele; Fossati, Matteo; Sun, Ming +8 more
Ram pressure stripping (RPS) is an important process to affect the evolution of cluster galaxies and their surrounding environment. We present a large MUSE mosaic for ESO 137-001 and its stripped tails, and study the detailed distributions and kinematics of the ionized gas and stars. The warm, ionized gas is detected to at least 87 kpc from the ga…
Outflow densities and ionization mechanisms in the NLRs of the prototypical Seyfert galaxies NGC 1068 and NGC 4151
Holden, Luke R.; Tadhunter, Clive N.
Despite being thought to play an important role in galaxy evolution, the true impact of outflows driven by active galactic nuclei (AGNs) on their host galaxies is unclear. In part, this may be because electron densities of outflowing gas are often underestimated: recent studies that use alternative diagnostics have measured much higher densities t…
Exploring the correlation between Hα-to-UV ratio and burstiness for typical star-forming galaxies at z 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +12 more
The $\rm {H}\alpha$-to-UV luminosity ratio ($L(\text{H}\alpha)/L(\rm UV)$) is often used to probe bursty star formation histories (SFHs) of star-forming galaxies and it is important to validate it against other proxies for burstiness. To address this issue, we present a statistical analysis of the resolved distribution of star formation rate surfa…
Hidden deep in the halo: selection of a reduced proper motion halo catalogue and mining retrograde streams in the velocity space
Helmi, Amina; Starkenburg, Else; Viswanathan, Akshara +3 more
The Milky Way halo is one of the few galactic haloes that provides a unique insight into galaxy formation by resolved stellar populations. Here, we present a catalogue of ~47 million halo stars selected independent of parallax and line-of-sight velocities, using a combination of Gaia DR3 proper motion and photometry by means of their reduced prope…
The breakdown of current gyrochronology as evidenced by old coeval stars
Godoy-Rivera, Diego; Chanamé, Julio; Silva-Beyer, Joaquín
Gyrochronology can yield useful ages for field main-sequence stars, a regime where other techniques are problematic. Typically, gyrochronology relations are calibrated using young (≲2 Gyr) clusters, but the constraints at older ages are scarce, making them potentially inaccurate and imprecise. In order to test the performance of existing relations…
Multiple flares in the changing-look AGN NGC 5273
Kochanek, C. S.; Huber, M. E.; Stanek, K. Z. +15 more
NGC 5273 is a known optical and X-ray variable AGN. We analyse new and archival IR, optical, UV, and X-ray data in order to characterize its long-term variability from 2000-2022. At least one optical changing-look event occurred between 2011 and 2014 when the AGN changed from a Type 1.8/1.9 Seyfert to a Type 1. It then faded considerably at all wa…
The value-added catalogue of ASAS-SN eclipsing binaries - III. Masses and radii of Gaia spectroscopic binaries
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +4 more
Masses and radii of stars can be derived by combining eclipsing binary light curves with spectroscopic orbits. In our previous work, we modelled the All-Sky Automated Survey for Supernovae (ASAS-SN) light curves of more than 30 000 detached eclipsing binaries using PHOEBE. Here, we combine our results with 128 double-lined spectroscopic orbits fro…
Reanalysis of neutron-capture elements in the benchmark r-rich star CS 31082-001
Spite, M.; Evans, C. J.; Barbuy, B. +4 more
We revisit the abundances of neutron-capture elements in the metal-poor ([Fe/H] = -2.9) r-process-rich halo star CS 31082-001. Partly motivated by the development of the new near-ultraviolet Cassegrain U-band Efficient Spectrograph for the Very Large Telescope, we compiled an expanded line list for heavy elements over the range 3000-4000 Å, includ…
The chemical compositions of multiple stellar populations in the globular cluster NGC 2808
Milone, A. P.; Cordoni, G.; Marino, A. F. +8 more
Pseudo two-colour diagrams or Chromosome maps (ChM) indicate that NGC 2808 host five different stellar populations. The existing ChMs have been derived by the Hubble Space Telescope photometry, and comprise of stars in a small field of view around the cluster centre. To overcome these limitations, we built a ChM with U, B, I photometry from ground…
WISDOM Project - XV. Giant molecular clouds in the central region of the barred spiral galaxy NGC 5806
Williams, Thomas G.; Cappellari, Michele; Davis, Timothy A. +7 more
We present high spatial resolution (≈24 pc) Atacama Large Millimeter/sub-millimeter Array 12CO(2-1) observations of the central region of the nearby barred spiral galaxy NGC 5806. NGC 5806 has a highly structured molecular gas distribution with a clear nucleus, a nuclear ring, and offset dust lanes. We identify 170 spatially and spectra…