Search Publications
Planck's view on the spectrum of the Sunyaev-Zeldovich effect
Bertoldi, Frank; Chluba, Jens; Basu, Kaustuv +1 more
We present a detailed analysis of the stacked frequency spectrum of a large sample of galaxy clusters using Planck data, together with auxiliary data from the AKARI and IRAS missions. Our primary goal is to search for the imprint of relativistic corrections to the thermal Sunyaev-Zeldovich effect (tSZ) spectrum, which allow to measure the temperat…
The spectral energy distribution of powerful starburst galaxies - I. Modelling the radio continuum
Callingham, J. R.; Filipović, M. D.; Seymour, N. +24 more
We have acquired radio-continuum data between 70 MHz and 48 GHz for a sample of 19 southern starburst galaxies at moderate redshifts (0.067 < z < 0.227) with the aim of separating synchrotron and free-free emission components. Using a Bayesian framework, we find the radio continuum is rarely characterized well by a single power law, instead …
Young star clusters in nearby molecular clouds
Garmire, G. P.; Getman, K. V.; Kuhn, M. A. +3 more
The SFiNCs (Star Formation in Nearby Clouds) project is an X-ray/infrared study of the young stellar populations in 22 star-forming regions with distances ≲ 1 kpc designed to extend our earlier MYStIX (Massive Young Star-Forming Complex Study in Infrared and X-ray) survey of more distant clusters. Our central goal is to give empirical constraints …
Low-frequency pulse profile variation in PSR B2217+47: evidence for echoes from the interstellar medium
Kramer, M.; Pilia, M.; Grießmeier, J. -M. +17 more
We have observed a complex and continuous change in the integrated pulse profile of PSR B2217+47, manifested as additional components trailing the main peak. These transient components are detected over 6 yr at 150 MHz using the LOw Frequency ARray (LOFAR), but they are not seen in contemporaneous Lovell observations at 1.5 GHz. We argue that prop…
Polarization of seven MBM clouds at high Galactic latitude
Neha, S.; Soam, A.; Maheswar, G. +1 more
We made R-band polarization measurements of 234 stars towards the direction of the MBM 33-39 cloud complex. The distance of the MBM 33-39 complex was determined as 120 ± 10 pc using polarization results and near-infrared photometry from the 2MASS survey. The magnetic field geometry of the individual clouds inferred from our polarimetric results re…
Spectroscopic and photometric study of the eclipsing interacting binary V495 Centauri
Mennickent, R. E.; Djurašević, G.; Curé, M. +2 more
Double Periodic Variables (DPV) are among the new enigmas of semidetached eclipsing binaries. These are intermediate-mass binaries characterized by a long photometric period lasting on average 33 times the orbital period. We present a spectroscopic and photometric study of the DPV V495 Cen based on new high-resolution spectra and the ASAS V-band l…
The curious case of II Lup: a complex morphology revealed with SAM/NACO and ALMA
Avison, A.; Zijlstra, A. A.; Tuthill, P. G. +5 more
We present the first-ever images of the circumstellar environment of the carbon-rich asymptotic giant branch (AGB) star II Lup in the infrared and sub-mm wavelengths, and the discovery of the envelope's non-spherical morphology with the use of high angular resolution imaging techniques with the sparse aperture masking mode on NACO/Very Large Teles…
On the detection of CO and mass-loss of bulge OH/IR stars
Blommaert, J. A. D. L.; Justtanont, K.; Decin, L. +1 more
We report on the successful search for CO (2-1) and (3-2) emission associated with OH/IR stars in the Galactic bulge. We observed a sample of eight extremely red asymptotic giant branch stars with the Atacama Pathfinder EXperiment telescope and detected seven. The sources were selected at a sufficiently high galactic latitude to avoid interference…
A D'-type symbiotic binary in the planetary nebula SMP LMC 88
Udalski, Andrzej; Kozłowski, Szymon; Miszalski, Brent +2 more
SMP LMC 88 is one of the planetary nebulae (PNe) in the Large Magellanic Cloud. We identify in its spectrum Raman scattered O VI lines at 6825 and 7083 Å. This unambiguously classifies the central object of the nebula as a symbiotic star (SySt). We identified the cold component to be a K-type giant, making this the first D'-type (yellow) SySt disc…
Probing the 9.7 µm interstellar silicate extinction profile through the Spitzer/IRS spectroscopy of OB stars
Gao, Jian; Li, Aigen; Shao, Zhenzhen +3 more
The 9.7 {µ}m interstellar spectral feature, arising from the Si-O stretch of amorphous silicate dust, is the strongest extinction feature in the infrared (IR). In principle, the spectral profile of this feature could allow one to diagnose the mineralogical composition of interstellar silicate material. However, observationally, the 9.7 {&mic…