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Sizes and shapes of young star cluster light profiles in M83
Larsen, S.; Bastian, N.; Gallagher, J. S. +6 more
We measure the radii and two-dimensional light profiles of a large sample of young, massive star clusters in M83 using archival HST/Wide Field Camera 3 (WFC3) imaging of seven adjacent fields. We use GALFIT to fit the two-dimensional light profiles of the clusters, from which we find effective (half-light) radii, core radii, and slopes of the powe…
How clustering dark energy affects matter perturbations
Mehrabi, A.; Basilakos, S.; Pace, F.
The rate of structure formation in the Universe is different in homogeneous and clustered dark energy models. The degree of dark energy clustering depends on the magnitude of its effective sound speed c2_eff and for c2_eff=0 dark energy clusters in a similar fashion to dark matter while for c2_eff=1 it stays (appro…
A forecasting model of the magnetosphere driven by an optimal solar wind coupling function
Tsyganenko, N. A.; Andreeva, V. A.
A new empirical magnetospheric magnetic field model is described, driven by interplanetary parameters including a coupling function by Newell et al. (2007), termed henceforth as "N index." The model uses data from Polar, Geotail, Cluster, and Time History of Events and Macroscale Interactions during Substorms satellites, obtained in 1995-2013 at d…
NuSTAR and XMM-Newton Observations of the Extreme Ultraluminous X-Ray Source NGC 5907 ULX1: A Vanishing Act
Harrison, F. A.; Stern, D.; Bachetti, M. +15 more
We present results obtained from two broadband X-ray observations of the extreme ultraluminous X-ray source (ULX) NGC 5907 ULX1, known to have a peak X-ray luminosity of ~5 × 1040 erg s-1. These XMM-Newton and NuSTAR observations, separated by only ~4 days, revealed an extreme level of short-term flux variability. In the firs…
New Ultraviolet Extinction Curves for Interstellar Dust in M31
Gordon, Karl D.; Fitzpatrick, Edward L.; Bohlin, R. C. +4 more
New low-resolution UV spectra of a sample of reddened OB stars in M31 were obtained with the Hubble Space Telescope/STIS to study the wavelength dependence of interstellar extinction and the nature of the underlying dust grain populations. Extinction curves were constructed for four reddened sightlines in M31 paired with closely matching stellar a…
Herschel Galactic Plane Survey of [NII] Fine Structure Emission
Goldsmith, Paul F.; Pineda, Jorge L.; Yıldız, Umut A. +1 more
We present the first large-scale high angular resolution survey of ionized nitrogen in the Galactic Plane through emission of its two fine structure transitions ([N ii]) at 122 and 205 µm. The observations were largely obtained with the PACS instrument onboard the Herschel Space Observatory. The lines of sight were in the Galactic plane, fol…
ALMA imaging of SDP.81 - II. A pixelated reconstruction of the CO emission lines
Andreani, P.; Rybak, M.; Vegetti, S. +2 more
We present a sub-100 pc-scale analysis of the CO molecular gas emission and kinematics of the gravitational lens system SDP.81 at redshift 3.042 using Atacama Large Millimetre/submillimetre Array (ALMA) science verification data and a visibility-plane lens reconstruction technique. We find clear evidence for an excitation-dependent structure in th…
Neutrinos in the holographic dark energy model: constraints from latest measurements of expansion history and growth of structure
Zhang, Jing-Fei; Zhang, Xin; Li, Yun-He +1 more
The model of holographic dark energy (HDE) with massive neutrinos and/or dark radiation is investigated in detail. The background and perturbation evolutions in the HDE model are calculated. We employ the PPF approach to overcome the gravity instability difficulty (perturbation divergence of dark energy) led by the equation-of-state parameter w ev…
The resolved star-formation relation in nearby active galactic nuclei
Combes, Françoise; Casasola, Viviana; Hunt, Leslie +1 more
Aims: We present an analysis of the relation between the star formation rate (SFR) surface density (ΣSFR) and mass surface density of molecular gas (ΣH2), commonly referred to as the Kennicutt-Schmidt (K-S) relation, on its intrinsic spatial scale, i.e. the size of giant molecular clouds (~10-150 pc), in the c…
The Galactic 26Al Emission Map as Revealed by INTEGRAL SPI
Jourdain, Elisabeth; Roques, Jean-Pierre; Bouchet, Laurent
Diffuse emission is often challenging since it is undetectable by most instruments, which are generally dedicated to point-source studies. The 26Al emission is a good illustration: the only available 26Al map to date has been released, more than 15 yr ago, thanks to the COMPTEL instrument. However, at the present time, the SP…