Search Publications
Discovery of spin-up in the X-ray pulsar companion of the hot subdwarf HD 49798
Pintore, Fabio; Mereghetti, Sandro; Esposito, Paolo +4 more
The hot subdwarf HD 49798 has an X-ray emitting compact companion with a spin-period of 13.2 s and a dynamically measured mass of 1.28 ± 0.05 M⊙, consistent with either a neutron star or a white dwarf. Using all the available XMM-Newton and Swift observations of this source, we could perform a phase-connected timing analysis extending b…
A SINFONI view of the nuclear activity and circumnuclear star formation in NGC 4303
Colina, L.; Storchi-Bergmann, T.; Riffel, Rogemar A. +8 more
We present new maps of emission-line flux distributions and kinematics in both ionized (traced by H I and [Fe II] lines) and molecular (H2) gas of the inner 0.7 × 0.7 kpc2 of the galaxy NGC 4303, with a spatial resolution 40-80 pc and velocity resolution 90-150 km s- 1 obtained from near-IR integral field spectrosc…
The fossil wind structures of Eta Carinae: changes across one 5.54-yr cycle
Hamaguchi, Kenji; Corcoran, Michael; Moffat, Anthony F. J. +11 more
Eta Carinae, the closest, active, massive binary containing a highly unstable Luminous Blue Variable, exhibits expanding, compressed wind shells, seen in emission, that are spatially and spectrally resolved by Hubble Space Telescope/Space Telescope Imaging Spectrograph. Starting in 2009 June, these structures were mapped across its 5.54-yr, highly…
H I-deficient galaxies in intermediate-density environments
Koribalski, B. S.; Dénes, H.; Wong, O. I. +1 more
Observations show that spiral galaxies in galaxy clusters tend to have on average less neutral hydrogen (H I) than galaxies of the same type and size in the field. There is accumulating evidence that such H I-deficient galaxies are also relatively frequent in galaxy groups. An important question is that which mechanisms are responsible for the gas…
Charged particle signatures of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Szego, K.; Goetz, C.; Henri, P. +9 more
One of the scientific objectives of the Rosetta mission is to investigate the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko. We employed combined data of several instruments of the Rosetta Plasma Consortium to identify and study diamagnetic cavity crossing events. Using electron data from the Ion Electron Sensor to complement the Magnetome…
Wolf-Rayet stars in M81: detection and characterization using GTC/OSIRIS spectra and HST/ACS images
Gómez-González, V. M. A.; Mayya, Y. D.; Rosa-González, D.
We here report the properties of Wolf-Rayet (W-R) stars in 14 locations in the nearby spiral galaxy M81. These locations were found serendipitously while analysing the slit spectra of a sample of ∼150 star-forming complexes, taken using the long-slit and multiobject spectroscopic modes of the OSIRIS instrument at the 10.4-m Gran Telescopio Canaria…
Mt. Wendelstein imaging of the post-perihelion dust coma of 67P/Churyumov-Gerasimenko in 2015/2016
Hopp, Ulrich; Riffeser, Arno; Kluge, Matthias +3 more
Comet 67P/Churyumov-Gerasimenko (67P) was imaged with the 2 m telescope at Mt. Wendelstein Observatory in the Alps. Coma and tail monitoring was performed during 51 nights between 2015 August 22 and 2016 May 9. The images through r and I Sloan Digital Sky Survey (SDSS) filters show the dust distribution around the comet, while images in the SDSS g…
Optical and near-infrared observations of SN 2014ck: an outlier among the Type Iax supernovae
Howell, D. A.; Kankare, E.; Turatto, M. +18 more
We present a comprehensive set of optical and near-infrared (NIR) photometric and spectroscopic observations for SN 2014ck, extending from pre-maximum to six months later. These data indicate that SN 2014ck is photometrically nearly identical to SN 2002cx, which is the prototype of the class of peculiar transients named SNe Iax. Similar to SN 2002…
Recurring X-ray outbursts in the supernova impostor SN 2010da in NGC 300
Skillman, E. D.; Kong, A. K. H.; Williams, B. F. +4 more
We present new observations of the `supernova impostor' SN 2010da using the Chandra X-ray Observatory and the Hubble Space Telescope. During the initial 2010 outburst, the 0.3-10 keV luminosity was observed by Swift to be ∼5 × 1038 erg s-1 and faded by a factor of ∼25 in a four month period. Our two new Chandra observations s…
Optical and NIR observations of the nearby type Ia supernova SN 2014J
Ojha, D. K.; Anupama, G. C.; Prabhu, T. P. +4 more
Optical and NIR observations of the Type Ia supernova SN 2014J in M82 are presented. The observed light curves are found to be similar to normal Type Ia supernovae (SNe Ia), with a decline rate parameter Δm15(B) = 1.08 ± 0.03. The supernova reached B-band maximum on JD 2456690.14, at an apparent magnitude mB(max) = 11.94. The…