Search Publications
Spatially resolved dust emission of extremely metal-poor galaxies*
Li, Aigen; Armus, Lee; Helou, George +4 more
We present infrared (IR) spectral energy distributions (SEDs) of individual star-forming regions in four extremely metal-poor (EMP) galaxies with metallicity Z ≲ Z⊙/10 as observed by the Herschel Space Observatory. With the good wavelength coverage of the SED, it is found that these EMP star-forming regions show distinct SED shapes as c…
H-ATLAS: the far-infrared properties of galaxies in and around the Coma cluster
Ibar, E.; Dunne, L.; Dye, S. +12 more
We describe a far-infrared survey of the Coma cluster and the galaxy filament it resides within. Our survey covers an area of ∼150 deg2 observed by Herschel H-ATLAS (Herschel Astrophysical Terahertz Large Area Survey) in five bands at 100, 160, 250, 350 and 500 µm. The SDSS spectroscopic survey (mr ≤ 17.8) is used to de…
Evidence for variable, correlated X-ray and optical/IR extinction towards the nearby, pre-main-sequence binary TWA 30
Kastner, J. H.; Alcalá, J. M.; Principe, David A. +2 more
We present contemporaneous XMM-Newton X-ray and ground-based optical/near-IR spectroscopic observations of the nearby (D ≈ 42 pc), low-mass (mid-M) binary system TWA 30A and 30B. The components of this wide (separation ∼3400 au) binary are notable for their nearly edge-on disc viewing geometries, high levels of variability, and evidence for collim…
A tale of two tails: exploring stellar populations in the tidal tails of NGC 3256
Gronwall, Caryl; Ciardullo, Robin; Charlton, Jane +7 more
We have developed an observing programme using deep, multiband imaging to probe the chaotic regions of tidal tails in search of an underlying stellar population, using NGC 3256's 400 Myr twin tidal tails as a case study. These tails have different colours of u - g = 1.05 ± 0.07 and r - I = 0.13 ± 0.07 for NGC 3256W, and u - g = 1.26 ± 0.07 and r -…
SEDEBLEND: a new method for deblending spectral energy distributions in confused imaging
Scott, Douglas; Swinbank, Mark; MacKenzie, Todd P.
For high-redshift submillimetre or millimetre sources detected with single-dish telescopes, interferometric follow-up has shown that many are multiple submillimetre galaxies blended together. Confusion-limited Herschel observations of such targets are also available, and these sample the peak of their spectral energy distribution (SED) in the far-…
Digging process in NGC 6951: the molecular disc bumped by the jet
Ricci, T. V.; Steiner, J. E.; May, D. +2 more
We present a study of the central 200 pc of the galaxy NGC 6951, SAB(rs)bc, an active twin of the Milky Way, at a distance of 24 Mpc. Its nucleus has been observed in the optical with the Integral Field Unit of the Gemini Multi-Object Spectrograph, showing an outflow, and with the HST/ACS, revealing two extended structures with similar orientation…
Ultraviolet spectral synthesis of HD 72660
Landstreet, J. D.; Golriz, S. S.
The study of chemical abundances in stellar atmosphere provides a useful tool to investigate the formation and evolution history of stars. The optical wavelength range has been used almost exclusively in the past to determine the elemental abundance in A-type stars. We use high-resolution, high signal-to-noise ultraviolet spectra obtained from the…
Constraining MOND using the vertical motion of stars in the solar neighbourhood
Margalit, Ben; Shaviv, Nir J.
Stars with a different vertical motion relative to the Galactic disc have a different average acceleration. According to modified Newtonian dynamics (MOND) theories, they should therefore have a different average orbital velocity while revolving around the Milky Way. We show that this property can be used to constrain MOND theories by studying sta…
Discovery of a long-lived, high-amplitude dusty infrared transient
Maccarone, T. J.; Torres, M. A. P.; Nelemans, G. +15 more
We report the detection of an infrared-selected transient which has lasted at least five years, first identified by a large mid-infrared and optical outburst from a faint X-ray source detected with the Chandra X-ray Observatory. In this paper we rule out several scenarios for the cause of this outburst, including a classical nova, a luminous red n…
Low-end mass function of the Quintuplet cluster
Kim, Sungsoo S.; Shin, Jihye
The Quintuplet and Arches clusters, which were formed in the harsh environment of the Galactic Centre (GC) a few million years ago, have been excellent targets for studying the effects of a star-forming environment on the initial mass function (IMF). In order to estimate the shape of the low-end IMF of the Arches cluster, Shin & Kim devised a …