Search Publications
Integral field spectroscopy of luminous infrared main-sequence galaxies at cosmic noon
Magdis, G. E.; Rigopoulou, D.; Huang, J. -S. +5 more
We present the results of an integral field spectroscopy survey of a sample of dusty (ultra) luminous infrared galaxies (U/LIRGs) at 2 < z < 2.5 using KMOS on the Very Large Telescope. The sample has been drawn from Herschel deep field surveys and benefits from ancillary multiwavelength data. Our goal is to investigate the physical character…
Broad He I 1.08-µm absorption from the obscurer in the active galaxy NGC 5548
Czerny, Bożena; Landt, Hermine; Kynoch, Daniel +2 more
The nucleus of the active galaxy NGC 5548 was the target of two intensive spectroscopic monitoring campaigns at X-ray, ultraviolet (UV), and optical frequencies in 2013/2014. These campaigns detected the presence of a massive obscuration event. In 2016/2017, Landt et al. conducted a near-IR spectroscopic monitoring campaign on NGC 5548 and discove…
On the partial eruption of a bifurcated solar filament structure
Liu, Jiajia; Uddin, Wahab; Chandra, Ramesh +4 more
The partial eruption of a filament channel with bifurcated substructures is investigated using data sets obtained from both ground-based and space-borne facilities. Small-scale flux reconnection/cancellation events in the region triggered the pile-up of ambient magnetic field, observed as bright extreme ultraviolet (EUV) loops in close proximity t…
Testing the chemical homogeneity of chemically tagged dissolved birth clusters
Bovy, Jo; Cheng, Chloe M.; Price-Jones, Natalie
Chemically tagging stars back to common formation sites in the Milky Way and establishing a high level of chemical homogeneity in these chemically tagged birth clusters is crucial for understanding the chemical and dynamical history of the Galactic disc. We constrain the intrinsic abundance scatter in 17 newly chemically tagged dissolved birth clu…
NGC 6611 601: a hot pre-main-sequence spectroscopic binary containing a centrifugal magnetosphere host star
Wade, G. A.; Shultz, M. E.; Alecian, E. +5 more
W 601 (NGC 6611 601) is one of the handful of known magnetic Herbig Ae/Be stars. We report the analysis of a large data set of high-resolution spectropolarimetry. The star is a previously unreported spectroscopic binary, consisting of two B2 stars with a mass ratio of 1.8, masses of 12 and 6.2 M⊙, in an eccentric 110-d orbit. The magnet…
Explosive nucleosynthesis of a metal-deficient star as the source of a distinct odd-even effect in the solar twin HIP 11915
Meléndez, Jorge; Karakas, Amanda I.; Asplund, Martin +2 more
The abundance patterns observed in the Sun and in metal-poor stars show a clear odd-even effect. An important question is whether the odd-even effect in solar-metallicity stars is similar to the Sun, or if there are variations that can tell us about different chemical enrichment histories. In this work, we report for the first time observational e…
New X-ray detections of known Wolf-Rayet stars
Nazé, Yaël; Gosset, Eric; Marechal, Quentin
Using XMM-Newton, we undertook a dedicated project to search for X-ray bright wind-wind collisions in 18 WR+OB systems. We complemented these observations with Swift and Chandra data sets, allowing for the study of two additional systems. We also improved the ephemerides, for these systems displaying photometric changes, using TESS, Kepler, and AS…
AzTEC survey of the central molecular zone: data reduction, analysis, and preliminary results
Zavala, Jorge A.; Gutermuth, Robert A.; Yun, Min S. +14 more
We present a large-scale survey of the central molecular zone (CMZ) of our Galaxy, as well as a monitoring program of Sgr A*, with the AzTEC/Large Millimeter Telescope in the 1.1 mm continuum. Our 1.1 mm map covers the main body of the CMZ over a field of 1.6 × 1.1 deg2 with an angular resolution of 10.5 arcsec and a depth of 15 mJy bea…
Fractal dimension of optical cirrus in Stripe82
Gontcharov, George A.; Mosenkov, Aleksandr V.; Román, Javier +4 more
The geometric characteristics of dust clouds provide important information on the physical processes that structure such clouds. One of such characteristics is the 2D fractal dimension D of a cloud projected on to the sky plane. In previous studies, which were mostly based on infrared (IR) data, the fractal dimension of individual clouds was found…
Observing correlations between dark matter accretion and galaxy growth - I. Recent star formation activity in isolated Milky Way-mass galaxies
Behroozi, Peter; More, Surhud; O'Donnell, Christine
The correlation between fresh gas accretion on to haloes and galaxy star formation is critical to understanding galaxy formation. Different theoretical models have predicted different correlation strengths between halo accretion rates and galaxy star formation rates, ranging from strong positive correlations to little or no correlation. Here, we p…