Search Publications
A photodissociation region study of NGC 4038
Barlow, M. J.; Bell, T. A.; Viti, S. +3 more
We present a model of the photodissociation regions of NGC 4038, which is part of the Antennae galaxies. We have considered one-dimensional slabs of uniform density, all having a maximum AV = 10 mag, interacting with plane-parallel radiation. The density range in our simulations spans four orders of magnitude (100 ≤ n ≤ 106 c…
The X-ray properties of the cometary blue compact dwarf galaxies Mrk 59 and Mrk 71
Bauer, F. E.; Thuan, T. X.; Izotov, Y. I.
We present XMM-Newton and Chandra observations of two low-metallicity cometary blue compact dwarf (BCD) galaxies, Mrk 59 and Mrk 71. The first BCD, Mrk 59, contains two ultraluminous X-ray sources (ULXs), IXO 72 and IXO 73, both associated with bright massive stars and H II complexes, as well as one fainter extended source associated with a massiv…
Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay
Belloni, T.; Tomsick, J. A.; Wilms, J. +12 more
We characterized the broad-band X-ray spectra of Swift J1745-26 during the decay of the 2013 outburst using INTEGRAL ISGRI, JEM-X and Swift XRT. The X-ray evolution is compared to the evolution in optical and radio. We fit the X-ray spectra with phenomenological and Comptonization models. We discuss possible scenarios for the physical origin of an…
The energy source and dynamics of infrared luminous galaxy ESO 148-IG002
Kewley, Lisa J.; Dopita, Michael A.; Rich, Jeffrey A. +1 more
ESO 148-IG002 represents a transformative stage of galaxy evolution, containing two galaxies at close separation which are currently coalescing into a single galaxy. We present integral field data of this galaxy from the ANU Wide Field Spectrograph. We analyse our integral field data using optical line ratio maps and velocity maps. We apply active…
Herschel, Spitzer and Magellan infrared observations of the star-forming region RCW 121 (IRAS 17149-3916)
Roth, M.; Elia, D.; Gómez, M. +4 more
We present new deep near-infrared broad- and narrow-band imaging and low-resolution spectroscopy of the star formation region RCW 121 (IRAS 17149-3916) which we analyse in combination with Herschel (70, 160, 250, 350 and 500 µm) and Spitzer (3.6, 4.5, 5.8 and 8 µm) images. The near-infrared photometry reveals the presence of a stellar …
Tracing CNO exposed layers in the Algol-type binary system u Her
Southworth, J.; Pavlovski, K.; Dervişoğlu, A. +1 more
The chemical composition of stellar photospheres in mass-transferring binary systems is a precious diagnostic of the nucleosynthesis processes that occur deep within stars, and preserves information on the components' history. The binary system u Her belongs to a group of hot Algols with both components being B stars. We have isolated the individu…
Helioseismic measurements in the solar envelope using group velocities of surface waves
Vorontsov, S. V.; Baturin, V. A.; Ayukov, S. V. +1 more
At intermediate- and high-degree l, solar p and f modes can be considered as surface waves. Using variational principle, we derive an integral expression for the group velocities of the surface waves in terms of adiabatic eigenfunctions of normal modes, and address the benefits of using group-velocity measurements as a supplementary diagnostic too…
Dust formation by failed supernovae
Kochanek, C. S.
We consider dust formation during the ejection of the hydrogen envelope of a red supergiant during a failed supernova (SN) creating a black hole. While the dense, slow moving ejecta are very efficient at forming dust, only the very last phases of the predicted visual transient will be obscured. The net grain production consists of Md ∼ …
A partial eclipse of the heart: the absorbed X-ray low state in Mrk 1048
Schartel, N.; Santos-Lleó, M.; Fabian, A. C. +4 more
We present two new XMM-Newton observations of an unprecedented low-flux state in the Seyfert 1 Mrk 1048 (NGC 985), taken in 2013. The X-ray flux below 1 keV drops by a factor of 4-5, whereas the spectrum above 5 keV is essentially unchanged. This points towards an absorption origin for the low state, and we confirm this with spectral fitting, find…
The Herschel Fornax Cluster Survey II: FIR properties of optically selected Fornax cluster galaxies
Bianchi, S.; De Looze, I.; Auld, R. +13 more
The Herschel Fornax Cluster Survey is a deep, far-infrared (FIR) survey of the Fornax cluster. The survey is in five Herschel bands (100-500 µm) and covers an area of 16 deg2 centred on NGC 1399. This paper presents photometry, detection rates, dust masses, and temperatures using an optically selected sample from the Fornax Cluste…