Search Publications
Missions
Journals
Publication Years
The XXL Survey. VI. The 1000 brightest X-ray point sources
Chiappetti, L.; Paltani, S.; Lidman, C. +36 more
Context. X-ray extragalactic surveys are ideal laboratories for the study of the evolution and clustering of active galactic nuclei (AGN). Usually, a combination of deep and wide surveys is necessary to create a complete picture of the population. Deep X-ray surveys provide the faint population at high redshift, while wide surveys provide the rare…
The Intermediate Luminosity Optical Transient SN 2010da: The Progenitor, Eruption, and Aftermath of a Peculiar Supergiant High-mass X-Ray Binary
Berger, E.; Brown, P. J.; Chornock, R. +7 more
We present optical spectroscopy, ultraviolet-to-infrared imaging, and X-ray observations of the intermediate luminosity optical transient (ILOT) SN 2010da in NGC 300 (d = 1.86 Mpc) spanning from -6 to +6 years relative to the time of outburst in 2010. Based on the light-curve and multi-epoch spectral energy distributions of SN 2010da, we conclude …
Magnetic Field in Atypical Prominence Structures: Bubble, Tornado, and Eruption
Schmieder, B.; Labrosse, N.; Dalmasse, K. +3 more
Spectropolarimetric observations of prominences have been obtained with the THEMIS telescope during four years of coordinated campaigns. Our aim is now to understand the conditions of the cool plasma and magnetism in “atypical” prominences, namely when the measured inclination of the magnetic field departs, to some extent, from the predominantly h…
Abundance ratios and IMF slopes in the dwarf elliptical galaxy NGC 1396 with MUSE
Smith, R.; Peletier, R. F.; Paolillo, M. +16 more
Deep observations of the dwarf elliptical (dE) galaxy NGC 1396 (MV = -16.60, Mass ∼4 × 108 M⊙), located in the Fornax cluster, have been performed with the Very Large Telescope/Multi Unit Spectroscopic Explorer spectrograph in the wavelength region from 4750 to 9350 Å. In this paper, we present a stellar population…
Striations in the Taurus molecular cloud: Kelvin-Helmholtz instability or MHD waves?
Falgarone, E.; Goldsmith, P. F.; Yıldız, U. A. +3 more
The origin of striations aligned along the local magnetic field direction in the translucent envelope of the Taurus molecular cloud is examined with new observations of 12CO and 13CO J = 2-1 emission obtained with the 10-m Submillimeter Telescope of the Arizona Radio Observatory. These data identify a periodic pattern of exce…
Anatomy of the AGN in NGC 5548. VI. Long-term variability of the warm absorber
Kaastra, J. S.; Kriss, G. A.; Bianchi, S. +13 more
Context. We observed the archetypal Seyfert 1 galaxy NGC 5548 in 2013-2014 in the context of an extensive multiwavelength campaign involving several satellites, which revealed the source to be in an extraordinary state of persistent heavy obscuration.
Aims: We re-analyzed the archival grating spectra obtained by XMM-Newton and Chandra between…
Ages of Massive Galaxies at 0.5 > z > 2.0 from 3D-HST Rest-frame Optical Spectroscopy
Franx, Marijn; Labbé, Ivo; van Dokkum, Pieter +10 more
We present low-resolution near-infrared stacked spectra from the 3D-HST survey up to z = 2.0 and fit them with commonly used stellar population synthesis models: BC03, FSPS10 (Flexible Stellar Population Synthesis), and FSPS-C3K. The accuracy of the grism redshifts allows the unambiguous detection of many emission and absorption features and thus …
Weakening of Jupiter's main auroral emission during January 2014
Fujimoto, M.; Yoshioka, K.; Steffl, A. J. +13 more
In January 2014 Jupiter's FUV main auroral oval decreased its emitted power by 70% and shifted equatorward by ∼1°. Intense, low-latitude features were also detected. The decrease in emitted power is attributed to a decrease in auroral current density rather than electron energy. This could be caused by a decrease in the source electron density, an…
Transition-region/Coronal Signatures and Magnetic Setting of Sunspot Penumbral Jets: Hinode (SOT/FG), Hi-C, and SDO/AIA Observations
Tiwari, Sanjiv K.; Winebarger, Amy R.; Moore, Ronald L. +1 more
Penumbral microjets (PJs) are transient narrow bright features in the chromosphere of sunspot penumbrae, first characterized by Katsukawa et al. using the Ca II H-line filter on Hinode's Solar Optical Telescope (SOT). It was proposed that the PJs form as a result of reconnection between two magnetic components of penumbrae (spines and interspines)…
An enhanced fraction of starbursting galaxies among high Eddington ratio AGNs
Daddi, E.; Ciesla, L.; Mullaney, J. R. +2 more
We investigate the star-forming properties of 1620 X-ray selected active galactic nuclei (AGN) host galaxies as a function of their specific X-ray luminosity (I.e. X-ray luminosity per unit host stellar mass) - a proxy of the Eddington ratio. Our motivation is to determine whether there is any evidence of a suppression of star formation at high Ed…