Search Publications
A rapid occultation event in NGC 3227
Turner, T. J.; Kraemer, S.; Reeves, J. N. +3 more
NGC 3227 exhibits rapid flux and spectral variability in the X-ray band. To understand this behaviour, we conducted a coordinated observing campaign using 320 ks of XMM-Newton exposures together with 160 ks of overlapping NuSTAR observations, spanning a month. Here, we present a rapid variability event that occurs toward the end of the campaign. T…
The infrared-radio correlation of spheroid- and disc-dominated star-forming galaxies to z ∼ 1.5 in the COSMOS field
Zamorani, Giovanni; Schinnerer, Eva; Murphy, Eric J. +14 more
Using infrared data from the Herschel Space Observatory and Karl G. Jansky Very Large Array 3 GHz observations in the COSMOS field, we investigate the redshift evolution of the infrared-radio correlation (IRRC) for star-forming galaxies (SFGs) we classify as either spheroid- or disc-dominated based on their morphology. The sample predominantly con…
Evolution of spatially resolved star formation main sequence and surface density profiles in massive disc galaxies at 0 ≲ z ≲ 1: inside-out stellar mass buildup and quenching
Abdurro'uf; Akiyama, Masayuki
We investigate a relation between surface densities of star formation rate (SFR) and stellar mass (M*) at a ∼1 kpc scale namely spatially resolved star formation main sequence (SFMS) in massive (log (M*/M⊙) > 10.5) face-on disc galaxies at 0.01 < z < 0.02 and 0.8 < z < 1.8 and examine evolution of th…
Dust-obscured star-forming galaxies in the early universe
Wilkins, Stephen M.; Croft, Rupert; Lovell, Christopher C. +3 more
Motivated by recent observational constraints on dust reprocessed emission in star-forming galaxies at z ∼ 6 and above, we use the very large cosmological hydrodynamical simulation BLUETIDES to explore predictions for the amount of dust-obscured star formation in the early Universe (z > 8). BLUETIDES matches current observational constraints on…
The cataclysmic variable QZ Lib: a period bouncer
Gänsicke, B. T.; Pala, A. F.; Mehner, A. +2 more
While highly evolved cataclysmic variables (CVs) with brown dwarf donors, often called `period bouncers', are predicted to make up ≃40-70 per cent of the Galactic CV population, only a handful of such systems are currently known. The identification and characterization of additional period bouncers is therefore important to probe this poorly under…
Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey
da Costa, L. N.; Ogando, R. L. C.; Bizyaev, D. +20 more
Combining stellar atmospheric parameters, such as effective temperature, surface gravity, and metallicity, with barycentric radial velocity data provides insight into the chemo-dynamics of the Milky Way and our local Galactic environment. We analyse 3075 stars with spectroscopic data from the Sloan Digital Sky Survey III MARVELS radial velocity su…
Probing the structure of the gas in the Milky Way through X-ray high-resolution spectroscopy
Churazov, Eugene; Gatuzz, Efraín
We have developed a new X-ray absorption model, called IONeq, which computes the optical depth τ(E) simultaneously for ions of all abundant elements, assuming ionization equilibrium and taking into account turbulent broadening. We use this model to analyse the interstellar medium (ISM) absorption features in the Milky Way for a sample of 18 Galact…
Scattering of exocomets by a planet chain: exozodi levels and the delivery of cometary material to inner planets
Kral, Quentin; Wyatt, Mark C.; Marino, Sebastian +1 more
Exocomets scattered by planets have been invoked to explain observations in multiple contexts, including the frequently found near- and mid-infrared excess around nearby stars arising from exozodiacal dust. Here we investigate how the process of inward scattering of comets originating in an outer belt is affected by the architecture of a planetary…
ALMACAL - III. A combined ALMA and MUSE survey for neutral, molecular, and ionized gas in an H I-absorption-selected system
Smail, I.; Swinbank, A. M.; Klitsch, A. +5 more
Studying the flow of baryons into and out of galaxies is an important part of understanding the evolution of galaxies over time. We present a detailed case study of the environment around an intervening Ly α absorption line system at zabs = 0.633, seen towards the quasar J0423-0130 (zQSO = 0.915). We detect with ALMA the
Optical spectroscopy of local type-1 AGN LINERs
García-Burillo, S.; Balmaverde, B.; González-Martín, O. +6 more
The Balmer emission originated in the broad-line region (BLR) of active galactic nuclei (AGNs) could be either weak and difficult to detect, or even absent, for low-luminosity AGNs, as low-ionization nuclear emission-line regions (LINERs). Our goals in this paper are threefold. First, we want to explore the AGN nature of nearby type-1 LINERs. Seco…