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Central Engine and Host Galaxy of RXJ 1301.9+2747: A Multiwavelength View of a Low-mass Black Hole Active Galactic Nuclei with Ultra-soft X-Ray Emission
Shu, X. W.; Wang, J. X.; Wang, T. G. +3 more
RXJ 1301.9+2747 is an optically identified very-low-mass AGN candidate with {M}{BH}∼ 1× {10}6 {M}⊙ , which shows extremely soft X-ray emission and unusual X-ray variability in the form of short-lived flares. We present an analysis of multiwavelength observations of RXJ 1301.9+2747 in order to study the properties o…
A combined view of sterile-neutrino constraints from CMB and neutrino oscillation measurements
Bridle, Sarah; Elvin-Poole, Jack; Evans, Justin +3 more
We perform a comparative analysis of constraints on sterile neutrinos from the Planck experiment and from current and future neutrino oscillation experiments (MINOS, IceCube, SBN). For the first time, we express joint constraints on Neff and meffsterile from the CMB in the Δm2, sin2 2 θ para…
The Significance of the Influence of the CME Deflection in Interplanetary Space on the CME Arrival at Earth
Wang, Yuming; Shen, Chenglong; Zhuang, Bin +5 more
As one of the most violent astrophysical phenomena, coronal mass ejections (CMEs) have strong potential space weather effects. However, not all Earth-directed CMEs encounter the Earth and produce geo-effects. One reason is the deflected propagation of CMEs in interplanetary space. Although there have been several case studies clearly showing such …
X-ray variability of Seyfert 1.8/1.9 galaxies
Guainazzi, M.; Panessa, F.; González-Martín, O. +3 more
Context. Seyfert 1.8/1.9 are sources showing weak broad Hα components in their optical spectra. According to unification schemes, they are seen with an edge-on inclination, similar to type 2 Seyfert galaxies, but with slightly lower inclination angles.
Aims: We aim to test whether Seyfert 1.8/1.9 have similar properties at UV and X…
Early Science with the Large Millimeter Telescope: Detection of Dust Emission in Multiple Images of a Normal Galaxy at z > 4 Lensed by a Frontier Fields Cluster
Giavalisco, Mauro; Kirkpatrick, Allison; Zavala, Jorge A. +32 more
We directly detect dust emission in an optically detected, multiply imaged galaxy lensed by the Frontier Fields cluster MACSJ0717.5+3745. We detect two images of the same galaxy at 1.1 mm with the AzTEC camera on the Large Millimeter Telescope leaving no ambiguity in the counterpart identification. This galaxy, MACS0717_Az9, is at z > 4 and the…
Impact of basic angle variations on the parallax zero point for a scanning astrometric satellite
van Leeuwen, Floor; Lindegren, Lennart; Hobbs, David +2 more
Context. Determination of absolute parallaxes by means of a scanning astrometric satellite such as Hipparcos or Gaia relies on the short-term stability of the so-called basic angle between the two viewing directions. Uncalibrated variations of the basic angle may produce systematic errors in the computed parallaxes.
Aims: We examine the coupl…
New Low-mass Stars in the 25 Orionis Stellar Group and Orion OB1a Sub-association from SDSS-III/BOSS Spectroscopy
Stassun, Keivan G.; Petr-Gotzens, Monika G.; Suárez, Genaro +6 more
The Orion OB1a sub-association is a rich low-mass star (LMS) region. Previous spectroscopic studies have confirmed 160 LMSs in the 25 Orionis stellar group (25 Ori), which is the most prominent overdensity of Orion OB1a. Nonetheless, the current census of the 25 Ori members is estimated to be lower than 50% complete, leaving a large number of memb…
The Origin of [C II] 157 µm Emission in a Five-component Interstellar Medium: The Case of NGC 3184 and NGC 628
Armus, L.; Hunt, L. K.; Smith, J. D. +13 more
With its relatively low ionization potential, C+ can be found throughout the interstellar medium (ISM) and provides one of the main cooling channels of the ISM via the [C II] 157 µm emission. While the strength of the [C II] line correlates with the star formation rate, the contributions of the various gas phases to the [C II] emi…
On the relation between the mass of Compact Massive Objects and their host galaxies
Capuzzo-Dolcetta, R.; Tosta e Melo, I.
Supermassive black holes and/or very dense stellar clusters are found in the central regions of galaxies. Nuclear star clusters (NSCs) are present mainly in faint galaxies, while supermassive black holes are common in galaxies with masses ≥1010 M⊙. In the intermediate galactic mass range, both types of compact massive objects…
The Causes of Quasi-homologous CMEs
Temmer, M.; Veronig, A. M.; Wang, Yuming +8 more
In this paper, we identified the magnetic source locations of 142 quasi-homologous (QH) coronal mass ejections (CMEs), of which 121 are from solar cycle (SC) 23 and 21 from SC 24. Among those CMEs, 63% originated from the same source location as their predecessor (defined as S-type), while 37% originated from a different location within the same a…