Search Publications
A search for variable and transient radio sources in the extended Chandra Deep Field South at 5.5 GHz
Gaensler, B. M.; Bell, M. E.; Murphy, Tara +5 more
We present a three epoch survey for transient and variables in the extended Chandra Deep Field South at 5.5 GHz with the Australia Telescope Compact Array. A region covering ∼0.3 deg2 was observed on time-scales of 2.5 months and 2.5 yr and typical sensitivities 12.1-17.1 µJy beam-1 (1σ) were achieved. This survey repre…
Dust energy balance study of two edge-on spiral galaxies in the Herschel-ATLAS survey
De Looze, Ilse; Baes, Maarten; Bendo, George J. +18 more
Interstellar dust in galaxies can be traced either through its extinction effects on the star light or through its thermal emission at infrared wavelengths. Recent radiative transfer studies of several nearby edge-on galaxies have found an apparent inconsistency in the dust energy balance: the radiative transfer models that successfully explain th…
X-ray time lags and non-linear variability in the ultraluminous X-ray sources NGC 5408 X-1 and NGC 6946 X-1
Vaughan, S.; Roberts, T. P.; Middleton, M. +1 more
We present our analysis of the X-ray variability of two ultraluminous X-ray sources (ULXs) based on multiple XMM-Newton observations. We show that the linear rms-flux relation is present in eight observations of NGC 5408 X-1 and also in three observations of NGC 6946 X-1, but data from other ULXs are generally not sufficient to constrain any rms-f…
Characterizing extragalactic anomalous microwave emission in NGC 6946 with CARMA
Hensley, Brandon; Murphy, Eric; Staguhn, Johannes
Using 1 cm and 3 mm observations from the Combined Array for Research in Millimeter-wave Astronomy and 2 mm observations from the Goddard IRAM Superconducting 2 Millimeter Observer observations, we follow up the first extragalactic detection of anomalous microwave emission (AME) reported by Murphy et al. in an extranuclear region (Enuc. 4) of the …
Dissecting galactic bulges in space and time - I. The importance of early formation scenarios versus secular evolution
Seidel, M. K.; Falcón-Barroso, J.; Vogt, F. P. A. +7 more
The details of bulge formation via collapse, mergers, secular processes or their interplay remain unresolved. To start answering this question and quantify the importance of distinct mechanisms, we mapped a sample of three galactic bulges using data from the integral field spectrograph WiFeS on the ANU's 2.3-m telescope in Siding Spring Observator…
Observed trend in the star formation history and the dark matter fraction of galaxies at redshift z ≈ 0.8
Cappellari, Michele; Shetty, Shravan
We study the star formation history for a sample of 154 galaxies with stellar mass 10^{10}≲ M_{*} ≲ 10^{12} { M_{⊙}} in the redshift range 0.7 < z < 0.9. We do this using stellar population models combined with full-spectrum fitting of good quality spectra and high-resolution photometry. For a subset of 68 galaxies (M_{*}≳ 10^{11}{ M_{⊙}}) w…
Multiband variability in the blazar 3C 273 with XMM-Newton
Bhagwan, Jai; Gupta, Alok C.; Wiita, Paul J. +2 more
We have undertaken a nearly simultaneous optical/UV and X-ray variability study of the flat spectrum radio quasar, 3C 273 using data available from the XMM-Newton satellite mission from 2000 June to 2012 July. Here, we focus on the multiwavelength flux variability on both intra-day and long time-scales of this very well known radio-loud source. We…
Large-scale cosmic microwave background temperature and polarization cross-spectra likelihoods
Mangilli, A.; Plaszczynski, S.; Tristram, M.
We present a cross-spectra-based approach for the analysis of cosmic microwave background data at large angular scales to constrain the reionization optical depth τ, the tensor to scalar ratio r and the amplitude of the primordial scalar perturbations As. With respect to the pixel-based approach developed so far, using cross-spectra has…
GRO J1744-28: an intermediate B-field pulsar in a low-mass X-ray binary
Sanna, A.; Robba, N. R.; Dauser, T. +10 more
The bursting pulsar, GRO J1744-28, went again in outburst after ∼18 yr of quiescence in 2014 mid-January. We studied the broad-band, persistent, X-ray spectrum using X-ray data from a XMM-Newton observation, performed almost at the peak of the outburst, and from a close INTEGRAL observation, performed 3 d later, thus covering the 1.3-70.0 keV band…
Investigating powerful jets in radio-loud narrow-line Seyfert 1s
Larsson, J.; Giroletti, M.; Dallacasa, D. +5 more
We report results on multiband observations from radio to γ-rays of the two radio-loud narrow-line Seyfert 1 (NLSy1) galaxies PKS 2004-447 and J1548+3511. Both sources show a core-jet structure on parsec scale, while they are unresolved at the arcsecond scale. The high core dominance and the high variability brightness temperature make these NLSy1…