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Mixed aliphatic and aromatic composition of evaporating very small grains in NGC 7023 revealed by the 3.4/3.3 µm ratio
Boulanger, F.; Joblin, C.; Onaka, T. +1 more
Context. A chemical scenario was proposed for photon-dominated regions (PDRs) according to which UV photons from nearby stars lead to the evaporation of very small grains (VSGs) and the production of gas-phase polycyclic aromatic hydrocarbons (PAHs).
Aims: Our goal is to achieve better insight into the composition and evolution of evaporating…
XMM-Newton Survey of Local O VII Absorption Lines in the Spectra of Active Galactic Nuclei
Fang, Taotao; Bullock, James; Buote, David +1 more
Highly ionized, z = 0 metal absorption lines detected in the X-ray spectra of background active galactic nuclei (AGNs) provide an effective method to probe the hot (T ∼ 106 K) gas and its metal content in and around the Milky Way. We present an all-sky survey of the {{K}α } transition of the local O vii absorption lines obtai…
Scientific assessment of the quality of OSIRIS images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +51 more
Context. OSIRIS, the scientific imaging system onboard the ESA Rosetta spacecraft, has been imaging the nucleus of comet 67P/Churyumov-Gerasimenko and its dust and gas environment since March 2014. The images serve different scientific goals, from morphology and composition studies of the nucleus surface, to the motion and trajectories of dust gra…
Determination of the Mass of IGR J17091-3624 from "Spectro-temporal" Variations during the Onset Phase of the 2011 Outburst
Nandi, A.; Mandal, S.; Iyer, N.
The 2011 outburst of the black hole candidate IGR J17091-3624 followed the canonical track of state transitions along with the evolution of quasi-periodic oscillation (QPO) frequencies before it began exhibiting various variability classes similar to GRS 1915+105. We use this canonical evolution of spectral and temporal properties to determine the…
Herschel-ATLAS: the connection between star formation and AGN activity in radio-loud and radio-quiet active galaxies
Ivison, R. J.; Fritz, J.; Hardcastle, M. J. +6 more
We examine the relationship between star formation and active galactic nuclei (AGN) activity by constructing matched samples of local (0 < z < 0.6) radio-loud and radio-quiet AGN in the Herschel-Astrophysical Terahertz Large Area Survey fields. Radio-loud AGN are classified as high-excitation and low-excitation radio galaxies using their emi…
Signals of a light dark force in the galactic center
Weiner, Neal; Liu, Jia; Xue, Wei
Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime ( m χ ≲ m Z /2). Because this is an experimentally well-trod energy range, it can be a challenge to develop simple models that explain this excess, consistent…
Helium and multiple populations in the massive globular cluster NGC 6266 (M 62)
Milone, A. P.
Recent studies suggest that the helium content of multiple stellar populations in globular clusters (GCs) is not uniform. The range of helium varies from cluster to cluster with more massive GCs having, preferentially, large helium spread. GCs with large helium variations also show extended-blue horizontal branch (HB). I exploit Hubble Space Teles…
The Spatial Distribution of the Young Stellar Clusters in the Star-forming Galaxy NGC 628
Cignoni, M.; Dale, D. A.; Calzetti, D. +21 more
We present a study of the spatial distribution of the stellar cluster populations in the star-forming galaxy NGC 628. Using Hubble Space Telescope broadband WFC3/UVIS UV and optical images from the Treasury Program LEGUS (Legacy ExtraGalactic UV Survey), we have identified 1392 potential young (≲ 100 Myr) stellar clusters within the galaxy using a…
Multiwavelength Observations of a Partially Eruptive Filament on 2011 September 8
Feng, L.; Cheng, X.; Guo, Y. +5 more
In this paper, we report our multiwavelength observations of a partial filament eruption event in NOAA active region (AR) 11283 on 8 September 2011. A magnetic null point and the corresponding spine and separatrix surface are found in the AR. Beneath the null point, a sheared arcade supports the filament along the highly complex and fragmented pol…
The High-mass Stellar Initial Mass Function in M31 Clusters
Bell, Eric F.; Dolphin, Andrew E.; Skillman, Evan D. +16 more
We have undertaken the largest systematic study of the high-mass stellar initial mass function (IMF) to date using the optical color-magnitude diagrams (CMDs) of 85 resolved, young (4 {Myr}\lt t\lt 25 {Myr}), intermediate mass star clusters (103-104 M⊙), observed as part of the Panchromatic Hubble Andromeda Treasur…