Search Publications
67P/Churyumov-Gerasimenko active areas before perihelion identified by GIADA and VIRTIS data fusion
Fulle, M.; Erard, S.; Capaccioni, F. +16 more
We characterized 67P/Churyumov-Gerasimenko's cometary activity during its inbound arc before perihelion (2014 August-2015 January). We focused on the geomorphological regions of the Northern hemisphere observed by the ESA/Rosetta space probe during this time period. The GIADA dust detector characterized the physical properties of the fluffy and co…
Constraining the magnetic field on white dwarf surfaces; Zeeman effects and fine structure constant variation
Barstow, M. A.; Holberg, J. B.; Webb, J. K. +12 more
White dwarf (WD) atmospheres are subjected to gravitational potentials around 105 times larger than occur on Earth. They provide a unique environment in which to search for any possible variation in fundamental physics in the presence of strong gravitational fields. However, a sufficiently strong magnetic field will alter absorption lin…
Subaru narrow-band imaging search for Lyman continuum from galaxies at z > 3 in the GOODS-N field
Inoue, Akio K.; Yamada, Toru; Iwata, Ikuru +2 more
We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru/Suprime-Cam in an ∼800 arcmin2 blank field around the GOODS-N. We use 103 star-forming galaxies (SFGs) and 8 active galactic nuclei (AGNs) with spectroscopic redshifts in a range between 3.06 and 3.5 an…
Lack of close-in, massive planets of main-sequence A-type stars from Kepler
Skarka, Marek; Grziwa, Sascha; Guenther, Eike W. +5 more
Some theories of planet formation and evolution predict that intermediate-mass stars host more hot Jupiters than Sun-like stars, others reach the conclusion that such objects are very rare. By determining the frequencies of those planets we can test those theories.
Investigating the origin of the Fe emission lines of the Seyfert 1 galaxy Mrk 205
Guainazzi, Matteo; Laha, Sibasish; Tripathi, Shruti +1 more
We have investigated the nature and origin of the Fe K emission lines in Mrk 205 using observations with Suzaku and XMM-Newton, aiming to resolve the ambiguity between a broad emission line and multiple unresolved lines of higher ionization. We detect the presence of a narrow Fe K α emission line along with a broad-band Compton reflection hump at …
The imprint of the thick stellar disc in the mid-plane of three early-type edge-on galaxies in the Fornax cluster
Katkov, Ivan Yu; Kniazev, Alexei Yu; Kasparova, Anastasia V. +1 more
Galactic stellar discs, such as that of the Milky Way, have usually a complex structure consisting of a thin and a thick component. The study of galactic disc sub-structures and their differences can shed light on the galaxy assembling processes and their evolution. However, due to observational difficulties there is a lack of information about th…
A deeper look at the dust attenuation law of star-forming galaxies at high redshift
Bressan, A.; Pérez-González, P. G.; Barro, G. +4 more
A diverse range of dust attenuation laws is found in star-forming galaxies. In particular, Tress et al. (2018) studied the SHARDS survey to constrain the NUV bump strength (B) and the total-to-selective ratio (RV) of 1753 star-forming galaxies in the GOODS-N field at 1.5 < z < 3. We revisit here this sample to assess the implicati…
Discovery of a radio transient in M81
Gandhi, P.; Miller-Jones, J. C. A.; Fender, R. P. +9 more
We report the discovery of a radio transient in the spiral galaxy M81. The transient was detected in early 2015 as part of a two-year survey of M81 made up of 12 epochs using the Karl G. Jansky Very Large Array. While undetected on 2014 September 12, the source was first detected on 2015 January 2, from which point it remained visible at an approx…
The beamed jet and quasar core of the distant blazar 4C 71.07
Lähteenmäki, A.; Giroletti, M.; Villata, M. +61 more
The object 4C 71.07 is a high-redshift blazar whose spectral energy distribution shows a prominent big blue bump and a strong Compton dominance. We present the results of a 2-yr multiwavelength campaign led by the Whole Earth Blazar Telescope (WEBT) to study both the quasar core and the beamed jet of this source. The WEBT data are complemented by …
Primeval very low-mass stars and brown dwarfs - VII. The discovery of the first wide M + L extreme subdwarf binary
Zhang, ZengHua
I present the discovery of the first wide M + L extreme subdwarf binary system Gaia J0452-36AB. The binary is located at a distance of 137.27 ^{+0.68}_{-0.67} pc with a projected separation of 15828 ± 78 au. I classified Gaia J0452-36AB as esdM1 and esdL0 subdwarfs, respectively. Gaia J0452-36AB have typical halo kinematics, metallicity of [Fe/H] …