Search Publications
On the triple peaks of SNHunt248 in NGC 5806
Sollerman, J.; Jerkstrand, A.; Smartt, S. J. +19 more
We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning ~15 yr before discovery, to ~1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at MR ~ -15.0 mag. The post-discovery evolution is consistent with the ejecta from the outburst interacting…
Gamma-Ray Flaring Activity from the Gravitationally Lensed Blazar PKS 1830-211 Observed by Fermi LAT
Troja, E.; Caraveo, P. A.; Bechtol, K. +125 more
The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope routinely detects the MeV-peaked flat-spectrum radio quasar PKS 1830-211 (z = 2.507). Its apparent isotropic γ-ray luminosity (E > 100 MeV), averaged over ~3 years of observations and peaking on 2010 October 14/15 at 2.9 × 1050 erg s-1, makes it am…
A Statistical Study of the Solar Wind Turbulence at Ion Kinetic Scales Using the k-filtering Technique and Cluster Data
Li, X.; Roberts, O. W.; Jeska, L.
Plasma turbulence at ion kinetic scales in the solar wind is investigated using the multi-point magnetometer data from the Cluster spacecraft. By applying the k-filtering method, we are able to estimate the full three-dimensional power spectral density P(ωsc, k) at a certain spacecraft frequency ωsc in wavevector (k) space. B…
Morphometry of small recent impact craters on Mars: Size and terrain dependence, short-term modification
Watters, W. A.; Geiger, L. M.; Fendrock, M. +1 more
Most recent studies of crater morphometry on Mars have addressed large craters (D>5 km) using elevation models derived from laser altimetry. In the present work, we examine a global population of small (25 m ≤D≤5 km), relatively well-preserved simple impact craters using HiRISE stereo-derived elevation models. We find that scaling laws from pri…
Grain size limits derived from 3.6 µm and 4.5 µm coreshine
Juvela, M.; Paladini, R.; Henning, Th. +8 more
Context. Recently discovered scattered light from molecular cloud cores in the wavelength range 3-5 µm (called "coreshine") seems to indicate the presence of grains with sizes above 0.5 µm.
Aims: We aim to analyze 3.6 and 4.5 µm coreshine from molecular cloud cores to probe the largest grains in the size distribution.
M…
A morpho-kinematic and spectroscopic study of the bipolar nebulae: M 2-9, Mz 3, and Hen 2-104
Akras, S.; Steffen, W.; Harvey, E. +3 more
Context. Complex bipolar shapes can be generated either as a planetary nebula or a symbiotic system. The origin of the material ionised by the white dwarf is very different in these two scenarios, and it complicates the understanding of the morphologies of planetary nebulae.
Aims: The physical properties, structure, and dynamics of the bipola…
X-ray spectral variability of Seyfert 2 galaxies
González-Martín, O.; Márquez, I.; Masegosa, J. +1 more
Context. Variability across the electromagnetic spectrum is a property of active galactic nuclei (AGN) that can help constrain the physical properties of these galaxies. Nonetheless, the way in which the changes happen and whether they occur in the same way in every AGN are still open questions.
Aims: This is the third in a series of papers w…
A Detailed Study of Non-thermal X-Ray Properties and Interstellar Gas toward the γ-Ray Supernova Remnant RX J1713.7-3946
Tanaka, T.; Fukui, Y.; Onishi, T. +19 more
We have carried out a spectral analysis of the Suzaku X-ray data in the 0.4-12 keV range toward the shell-type very high-energy γ-ray supernova remnant (SNR) RX J1713.7-3946. The aims of this analysis are to estimate detailed X-rays spectral properties at a high angular resolution up to 2 arcmin and to compare them with the interstellar gas. The X…
PS1-10jh Continues to Follow the Fallback Accretion Rate of a Tidally Disrupted Star
Berger, E.; Rest, A.; Chornock, R. +5 more
We present late-time observations of the tidal disruption event candidate PS1-10jh. UV and optical imaging with Hubble Space Telescope/WFC3 localize the transient to be coincident with the host galaxy nucleus to an accuracy of 0.023 arcsec, corresponding to 66 pc. The UV flux in the F225W filter, measured 3.35 rest-frame years after the peak of th…
Early Science with the Large Millimeter Telescope: CO and [C II] Emission in the z = 4.3 AzTEC J095942.9+022938 (COSMOS AzTEC-1)
Iono, D.; Pope, A.; Terlevich, E. +27 more
Measuring redshifted CO line emission is an unambiguous method for obtaining an accurate redshift and total cold gas content of optically faint, dusty starburst systems. Here, we report the first successful spectroscopic redshift determination of AzTEC J095942.9+022938 (`COSMOS AzTEC-1'), the brightest 1.1 mm continuum source found in the AzTEC/Ja…