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Rotation curve and mass distribution in the Galaxy from the velocities of objects at distances up to 200 kpc
Bobylev, V. V.; Bajkova, A. T.
Three three-component (bulge, disk, halo) model Galactic gravitational potentials differing by the expression for the dark matter halo are considered. The central (bulge) and disk components are described by the Miyamoto-Nagai expressions. The Allen-Santillán (I), Wilkinson-Evans (II), and Navarro-Frenk-White (III) models are used to describe the …
Discovery of a fast, broad, transient outflow in NGC 985
Kaastra, J. S.; Kriss, G. A.; Ebrero, J. +1 more
Aims: We observed the Seyfert 1 galaxy NGC 985 on several occasions to search for variability in its UV and X-ray absorption features to establish their location and physical properties.
Methods: We used XMM-Newton to obtain X-ray spectra using the EPIC-pn camera, and the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (H…
Search for compensated isocurvature perturbations with Planck power spectra
Kovetz, Ely D.; Kamionkowski, Marc; Muñoz, Julian B. +2 more
In the standard inflationary scenario, primordial perturbations are adiabatic. The amplitudes of most types of isocurvature perturbations are generally constrained by current data to be small. If, however, there is a baryon-density perturbation that is compensated by a dark-matter perturbation in such a way that the total matter density is unpertu…
DDO 68: A Flea with Smaller Fleas that on Him Prey
Aloisi, Alessandra; Cignoni, Michele; Sacchi, Elena +7 more
We present new photometry of the dwarf irregular galaxy DDO 68, one of the most metal-poor and least massive dwarfs, located in the Lynx-Cancer Void. The images were acquired with the Large Binocular Telescope in the g and r passbands and show unequivocally that DDO 68 has previously unknown stellar streams related to the accretion of at least two…
H2S in the L1157-B1 bow shock
Viti, Serena; Bachiller, Rafael; Ceccarelli, Cecilia +8 more
Sulphur-bearing molecules are highly reactive in the gas phase of the interstellar medium. However, the form in which most of the sulphur is locked on to interstellar dust grains is unknown. By taking advantage of the short time-scales of shocks in young molecular outflows, one could track back the main form of sulphur in the ices. In this paper, …
Structure and stability in TMC-1: Analysis of NH3 molecular line and Herschel continuum data
Kirk, J.; Ward-Thompson, D.; Kraus, A. +5 more
Aims: We examined the velocity, density, and temperature structure of Taurus molecular cloud-1 (TMC-1), a filamentary cloud in a nearby quiescent star forming area, to understand its morphology and evolution.
Methods: We observed high signal-to-noise (S/N), high velocity resolution NH3(1,1), and (2, 2) emission on an extended …
Abundance stratification in Type Ia supernovae - V. SN 1986G bridging the gap between normal and subluminous SNe Ia
Pian, E.; Ashall, C.; Mazzali, P. A. +1 more
A detailed spectroscopic analysis of SN 1986G has been performed. SN 1986G `bridges the gap' between normal and subluminous Type Ia supernovae (SNe Ia). The abundance tomography technique is used to determine the abundance distribution of the elements in the ejecta. SN 1986G was found to be a low-energy Chandrasekhar mass explosion. Its kinetic en…
Explaining the reportedly overmassive black holes in early-type galaxies with intermediate-scale discs
Graham, Alister W.; Savorgnan, Giulia A. D.
The classification `early-type' galaxy includes both elliptically and lenticular-shaped galaxies. Theoretically, the spheroid-to-disc flux ratio of an early-type galaxy can assume any positive value, but in practice studies often consider only spheroid/disc decompositions in which the disc neatly dominates over the spheroid at large galaxy radii, …
The formation of bulges, discs and two-component galaxies in the CANDELS Survey at z < 3
Conselice, Christopher J.; Mortlock, Alice; Dekel, Avishai +5 more
We examine a sample of 1495 galaxies in the CANDELS fields to determine the evolution of two-component galaxies, including bulges and discs, within massive galaxies at the epoch 1 < z < 3 when the Hubble sequence forms. We fit all of our galaxies' light profiles with a single Sérsic fit, as well as with a combination of exponential and Sérsi…
Characterizing X-Ray and Radio Emission in the Black Hole X-Ray Binary V404 Cygni during Quiescence
Gandhi, Poshak; Chakrabarty, Deepto; Walton, Dominic J. +17 more
We present results from multi-wavelength simultaneous X-ray and radio observations of the black hole X-ray binary V404 Cyg in quiescence. Our coverage with NuSTAR provides the very first opportunity to study the X-ray spectrum of V404 Cyg at energies above 10 keV. The unabsorbed broadband (0.3-30 keV) quiescent luminosity of the source is 8.9 × 10…