Science Archives Publication System

Saturn's G and D Rings Provide Nearly Complete Measured Scattering Phase Functions of Nearby Debris Disks

DOI: 10.1088/0004-637X/811/1/67 Bibcode: 2015ApJ...811...67H

Hedman, Matthew M.; Stark, Christopher C.

The appearance of debris disks around distant stars depends upon the scattering/phase function (SPF) of the material in the disk. However, characterizing the SPFs of these extrasolar debris disks is challenging because only a limited range of scattering angles are visible to Earth-based observers. By contrast, Saturn’s tenuous rings can be observe…

2015 • The Astrophysical Journal

Cassini 43

Panchromatic Hubble Andromeda Treasury. XII. Mapping Stellar Metallicity Distributions in M31

DOI: 10.1088/0004-6256/150/6/189 Bibcode: 2015AJ....150..189G

Monachesi, Antonela; Dolphin, Andrew E.; Skillman, Evan D. +14 more

We present a study of spatial variations in the metallicity of old red giant branch stars in the Andromeda galaxy. Photometric metallicity estimates are derived by interpolating isochrones for over seven million stars in the Panchromatic Hubble Andromeda Treasury (PHAT) survey. This is the first systematic study of stellar metallicities over the i…

2015 • The Astronomical Journal

eHST 43

Interstellar Dust Properties from a Survey of X-Ray Halos

DOI: 10.1088/0004-637X/809/1/66 Bibcode: 2015ApJ...809...66V

Smith, Randall K.; Valencic, Lynne A.

Interstellar dust grains produce X-ray halos around bright sources due to small-angle X-ray scattering. Numerous studies have examined these halos, but no systematic study has yet tested the available halo data against the large number of well-defined dust models in circulation. We have therefore obtained the largest sample to date of X-ray dust h…

2015 • The Astrophysical Journal

XMM-Newton 43

Stellar multiplicity and debris discs: an unbiased sample

DOI: 10.1093/mnras/stv483 Bibcode: 2015MNRAS.449.3160R

Duchêne, Gaspard; Greaves, Jane; Matthews, Brenda +4 more

Circumstellar dust discs have been observed around many nearby stars. However, many stars are part of binary or multiple stellar systems. A natural question arises regarding the presence and properties of such discs in systems with more than one star. To address this, we consider a sample of 449 systems (spectral types A-M) observed with the Hersc…

2015 • Monthly Notices of the Royal Astronomical Society

Herschel 43

Interhemispheric differences in ionospheric convection: Cluster EDI observations revisited

DOI: 10.1002/2014JA020774 Bibcode: 2015JGRA..120.5805F

Haaland, S.; Förster, M.

The interaction between the interplanetary magnetic field and the geomagnetic field sets up a large-scale circulation in the magnetosphere. This circulation is also reflected in the magnetically connected ionosphere. In this paper, we present a study of ionospheric convection based on Cluster Electron Drift Instrument (EDI) satellite measurements …

2015 • Journal of Geophysical Research (Space Physics)

Cluster 43

Titan's atmosphere as observed by Cassini/VIMS solar occultations: CH₄, CO and evidence for C₂H₆ absorption

DOI: 10.1016/j.icarus.2014.10.004 Bibcode: 2015Icar..248....1M

Nicholson, Philip D.; Maltagliati, Luca; Bézard, Bruno +6 more

We present an analysis of the VIMS solar occultations dataset, which allows us to extract vertically resolved information on the characteristics of Titan's atmosphere between ∼100 and 700 km with a vertical resolution of ∼10 km. After a series of data treatment procedures to correct problems in pointing stability and parasitic light, 4 occultation…

2015 • Icarus

Cassini 43

Jet-ISM Interaction in the Radio Galaxy 3C 293: Jet-driven Shocks Heat ISM to Power X-Ray and Molecular H₂ Emission

DOI: 10.1088/0004-637X/801/1/17 Bibcode: 2015ApJ...801...17L

Appleton, P. N.; Guillard, P.; Emonts, B. +3 more

We present a 70 ks Chandra observation of the radio galaxy 3C 293. This galaxy belongs to the class of molecular hydrogen emission galaxies (MOHEGs) that have very luminous emission from warm molecular hydrogen. In radio galaxies, the molecular gas appears to be heated by jet-driven shocks, but exactly how this mechanism works is still poorly unde…

2015 • The Astrophysical Journal

eHST 43

Lepto-hadronic model for the broadband emission of Cygnus X-1

DOI: 10.1051/0004-6361/201527156 Bibcode: 2015A&A...584A..95P

Romero, Gustavo E.; Pepe, Carolina; Vila, Gabriela S.

Context. Cygnus X-1 is a well-observed microquasar. Broadband observations at all wavelengths have been collected over the years. The origin of the MeV tail observed with COMPTEL and INTEGRAL is still under debate and it has mostly been attributed to the corona, although its high degree of polarization suggests that it is synchrotron radiation fro…

2015 • Astronomy and Astrophysics

INTEGRAL 43

Whatever happened to the progenitors of supernovae 2008cn, 2009kr and 2009md?

DOI: 10.1093/mnras/stu2658 Bibcode: 2015MNRAS.447.3207M

Fraser, Morgan; Ergon, Mattias; Mattila, Seppo +2 more

We present new late-time, high-resolution observations of the sites of supernovae (SNe) 2008cn, 2009kr and 2009md, acquired with the Hubble Space Telescope. In all instances, significant flux from the SNe is still recovered at late times. We show that the previous identification of the progenitor of SN 2008cn was actually a blend of two sources, w…

2015 • Monthly Notices of the Royal Astronomical Society

eHST 43

Herschel spectroscopic observations of the compact obscured nucleus in Zw 049.057

DOI: 10.1051/0004-6361/201526114 Bibcode: 2015A&A...580A..52F

Veilleux, S.; Farrah, D.; van der Werf, P. P. +6 more

Context. The luminous infrared galaxy Zw 049.057 contains a compact obscured nucleus where a considerable amount of the galaxy's luminosity is generated. This nucleus contains a dusty environment that is rich in molecular gas. One approach to probing this kind of environment and to revealing what is hidden behind the dust is to …

2015 • Astronomy and Astrophysics

Herschel 43