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The compactness of the isolated neutron star RX J0720.4-3125
Werner, K.; Haberl, F.; Neuhäuser, R. +4 more
Aims: To estimate the compactness of the thermally-emitting isolated neutron star (INS) RX J0720.4-3125, an X-ray spin-phase-resolved spectroscopic study is conducted. In addition, to identify the genuine spin-period, an X-ray timing analysis is performed.
Methods: The data from all observations of RX J0720.4-3125 conducted by XMM-Newton…
Cosmic rays, gas and dust in nearby anticentre clouds. I. CO-to-H2 conversion factors and dust opacities
Marshall, D. J.; Casandjian, J. M.; Grenier, I. A. +1 more
Aims: We aim to explore the capabilities of dust emission and γ rays for probing the properties of the interstellar medium in the nearby anti-centre region, using γ-ray observations with the Fermi Large Area Telescope (LAT), and the thermal dust optical depth inferred from Planck and IRAS observations. We also aim to study massive star-formin…
Probing the solar transition region: current status and future perspectives
Tian, Hui
The solar transition region (TR) is the temperature regime from roughly 0.02 MK to 0.8 MK in the solar atmosphere. It is the transition layer from the collisional and partially ionized chromosphere to the collisionless and fully ionized corona. The TR plays an important role in the mass and energy transport in both the quiet solar atmosphere and s…
The most distant, luminous, dusty star-forming galaxies: redshifts from NOEMA and ALMA spectral scans
Pérez-Fournon, I.; Ivison, R. J.; Omont, A. +23 more
We present 1.3- and/or 3-mm continuum images and 3-mm spectral scans, obtained using Northern Extended Millimeter Array (NOEMA) and Atacama Large Millimeter Array (ALMA), of 21 distant, dusty, star-forming galaxies. Our sample is a subset of the galaxies selected by Ivison et al. on the basis of their extremely red far-infrared (far-IR) colours an…
A high fraction of Be stars in young massive clusters: evidence for a large population of near-critically rotating stars
Cabrera-Ziri, I.; Usher, C.; Bastian, N. +6 more
Recent photometric analyses of the colour-magnitude diagrams of young massive clusters (YMCs) have found evidence for splitting in the main sequence and extended main-sequence turn-offs, both of which have been suggested to be caused by stellar rotation. Comparison of the observed main-sequence splitting with models has led various authors to sugg…
The statistical properties of neutral gas at z < 1.65 from UV measurements of Damped Lyman Alpha systems
Turnshek, David A.; Rao, Sandhya M.; Monier, Eric M. +1 more
We derive the statistical properties of neutral gas at redshifts 0.11 < z < 1.65 from ultraviolet (UV) measurements of quasar Ly α absorption lines corresponding to 369 Mg II systems with W^{λ 2796}0 ≥ 0.3 Å. In addition to the 41 damped Lyman alpha (DLA) systems presented in Rao et al. (2006), the current DLA sample includes 29 n…
Calibration of Ultraviolet, Mid-infrared, and Radio Star Formation Rate Indicators
Imanishi, Masatoshi; Peek, J. E. G.; Kennicutt, Robert C. +12 more
We present calibrations for star formation rate (SFR) indicators in the ultraviolet, mid-infrared, and radio-continuum bands, including one of the first direct calibrations of 150 MHz as an SFR indicator. Our calibrations utilize 66 nearby star-forming galaxies with Balmer-decrement-corrected {{H}}α luminosities, which span five orders of magnitud…
Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
Seok, Ji Yeon; Li, Aigen
A distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 µm, is often detected in protoplanetary disks (PPDs). These features are commonly attributed to polycyclic aromatic hydrocarbons (PAHs). We model these emission features in the infrared spectra of 69 PPDs around 14 T Tauri and 55 Herbig Ae/Be stars in terms of as…
Magnetar Broadband X-Ray Spectra Correlated with Magnetic Fields: Suzaku Archive of SGRs and AXPs Combined with NuSTAR, Swift, and RXTE
Enoto, Teruaki; Makishima, Kazuo; Kitaguchi, Takao +7 more
The 1-70 keV persistent spectra of 15 magnetars, observed with Suzaku from 2006 to 2013, were studied as a complete sample. Combined with early NuSTAR observations of four hard X-ray emitters, nine objects showed a hard power-law emission dominating at ≳ 10 keV with the 15-60 keV flux of ∼1-11× {10}-11 erg s-1 cm-2…
Partially acoustic dark matter cosmology and cosmological constraints
Raveri, Marco; Hu, Wayne; Hoffman, Timothy +1 more
Observations of the cosmic microwave background (CMB) together with weak lensing measurements of the clustering of large scale cosmological structures and local measurements of the Hubble constant pose a challenge to the standard Λ CDM cosmological model. On one side CMB observations imply a Hubble constant that is lower than local measurements an…