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Detection of two power-law tails in the probability distribution functions of massive GMCs.
Abergel, A.; Hill, T.; Arzoumanian, D. +20 more
We report the novel detection of complex high column density tails in the probability distribution functions (PDFs) for three high-mass star-forming regions (CepOB3, MonR2, NGC 6334), obtained from dust emission observed with Herschel. The low column density range can be fitted with a lognormal distribution. A first power-law tail starts above an …
A Multiwavelength Study of the Relativistic Tidal Disruption Candidate Swift J2058.4+0516 at Late Times
Fruchter, Andrew S.; Filippenko, Alexei V.; Cenko, S. Bradley +12 more
We report a multiwavelength (X-ray, ultraviolet/optical/infrared (UVOIR), radio) analysis of the relativistic tidal disruption event (TDE) candidate Sw J2058+05 from 3 months to 3 yr post-discovery in order to study its properties and compare its behavior with that of Sw J1644+57. Our main results are as follows: (1) The long-term X-ray light curv…
The Metagalactic Ionizing Background: A Crisis in UV Photon Production or Incorrect Galaxy Escape Fractions?
Shull, J. Michael; Danforth, Charles W.; Tilton, Evan M. +1 more
Recent suggestions of a “photon underproduction crisis” have generated concern over the intensity and spectrum of ionizing photons in the metagalactic ultraviolet background (UVB). The balance of hydrogen photoionization and recombination determines the opacity of the low-redshift intergalactic medium (IGM). We calibrate the hydrogen photoionizati…
The neutron star in HESS J1731-347: Central compact objects as laboratories to study the equation of state of superdense matter
Werner, K.; Klochkov, D.; Santangelo, A. +3 more
Context. Central compact objects (CCOs) in supernova remnants are isolated thermally emitting neutron stars (NSs). They are most probably characterized by a magnetic field strength that is roughly two orders of magnitude lower than that of most of the radio and accreting pulsars. The thermal emission of CCOs can be modeled to obtain constraints on…
Dynamical features and spatial structures of the plasma interaction region of 67P/Churyumov-Gerasimenko and the solar wind
Glassmeier, K. -H.; Richter, I.; Koenders, C. +2 more
In the advent of the Rosetta arrival at the comet 67P/Churyumov-Gerasimenko, we present a global 3D hybrid simulation model of the cometary plasma interaction which resolves the innermost coma sufficiently. As Rosetta will only provide local information, global simulations are required to put these local observations into a wider global perspectiv…
Storm in a "Teacup": A Radio-quiet Quasar with ≈10 kpc Radio-emitting Bubbles and Extreme Gas Kinematics
Thomson, A. P.; Alexander, D. M.; Bauer, F. E. +5 more
We present multi-frequency (1-8 GHz) Very Large Array data, combined with VIsible MultiObject Spectrograph integral field unit data and Hubble Space Telescope imaging, of a z = 0.085 radio-quiet type 2 quasar (with L 1.4 GHz ≈ 5 × 1023 W Hz-1 and L AGN ≈ 2 × 1045 erg s-1). Due to th…
An Extreme Metallicity, Large-scale Outflow from a Star-forming Galaxy at z ~ 0.4
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
We present a detailed analysis of a large-scale galactic outflow in the circumgalactic medium of a massive ({M}{{h}}∼ {10}12.5 {M}⊙ ), star-forming (∼ 6.9 {M}⊙ yr-1), sub-L* (∼ 0.5{L}B*) galaxy at z = 0.39853 that exhibits a wealth of metal-line absorption in …
Suzaku observations of Mrk 335: confronting partial covering and relativistic reflection
Fabian, A. C.; Komossa, S.; Gallo, L. C. +7 more
We report on the deepest X-ray observation of the narrow-line Seyfert 1 galaxy Mrk 335 in the low-flux state obtained with Suzaku. The data are compared to a 2006 high-flux Suzaku observation when the source was ∼10 times brighter. Describing the two flux levels self-consistently with partial covering models would require extreme circumstances, as…
First observations of H2O and CO2 vapor in comet 67P/Churyumov-Gerasimenko made by VIRTIS onboard Rosetta
Kührt, E.; Encrenaz, T.; Erard, S. +29 more
Context. Outgassing from cometary nuclei involves complex surface and subsurface processes that need to be understood to investigate the composition of cometary ices from coma observations.
Aims: We investigate the production of water, carbon dioxide, and carbon monoxide from the nucleus of comet 67P/Churyumov-Gerasimenko (67P). These species…
A strong seasonal dependence in the Martian hydrogen exosphere
Bertaux, Jean-Loup; Chaufray, Jean-Yves; Clarke, John T. +2 more
Hubble Space Telescope and Mars Express observed unexpected rapid changes in the Martian hydrogen exosphere involving a decrease in scattered Lyman α intensity in fall 2007 (solar longitude, Ls = 331°-345°). These changes detected were speculated to be a combination of seasonal variation and/or dust storms and lower atmospheric dynamics…