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The Wolf-Rayet star population in the dwarf galaxy NGC 625
Walsh, J. R.; Monreal-Ibero, A.; Relaño, M. +4 more
Context. Quantifying the number, type, and distribution of Wolf-Rayet (W-R) stars is a key component in the context of galaxy evolution, since they put constraints on the age of the star formation bursts. Nearby galaxies (distances ≲5 Mpc) are particularly relevant in this context since they fill the gap between studies in the Local Group, where i…
AKARI/IRC source catalogues and source counts for the IRAC Dark Field, ELAIS North and the AKARI Deep Field South
Serjeant, S.; Pearson, C.; Matsuhara, H. +4 more
We present the first detailed analysis of three extragalactic fields (IRAC Dark Field, ELAIS-N1, ADF-S) observed by the infrared satellite, AKARI, using an optimized data analysis toolkit specifically for the processing of extragalactic point sources. The InfaRed Camera (IRC) on AKARI complements the Spitzer Space Telescope via its comprehensive c…
On the estimation of the current density in space plasmas: Multi- versus single-point techniques
Sorriso-Valvo, Luca; Perri, Silvia; Malara, Francesco +2 more
Thanks to multi-spacecraft mission, it has recently been possible to directly estimate the current density in space plasmas, by using magnetic field time series from four satellites flying in a quasi perfect tetrahedron configuration. The technique developed, commonly called ;curlometer; permits a good estimation of the current density when the ma…
Testing the Interacting Dark Energy Model with Cosmic Microwave Background Anisotropy and Observational Hubble Data
Yang, Weiqiang; Xu, Lixin; Wu, Yabo +2 more
The coupling between dark energy and dark matter provides a possible approach to mitigate the coincidence problem of the cosmological standard model. In this paper, we assumed the interacting term was related to the Hubble parameter, energy density of dark energy, and equation of state of dark energy. The interaction rate between dark energy and d…
Flare Ribbons Approach Observed by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory
Hou, Yijun; Li, Ting; Zhang, Jun
We report flare ribbons approach (FRA) during a multiple-ribbon M-class flare on 2015 November 4 in NOAA AR 12443, obtained by the Interface Region Imaging Spectrograph and the Solar Dynamics Observatory. The flare consisted of a pair of main ribbons and two pairs of secondary ribbons. The two pairs of secondary ribbons were formed later than the …
Above the Noise: The Search for Periodicities in the Inner Heliosphere
De Moortel, Ineke; Threlfall, James; Conlon, Thomas
Remote sensing of coronal and heliospheric periodicities can provide vital insight into the local conditions and dynamics of the solar atmosphere. We seek to trace long (one hour or longer) periodic oscillatory signatures (previously identified above the limb in the corona by, e.g., Telloni et al. in Astrophys. J.767, 138, 2013) from their origin …
Removing Visual Bias in Filament Identification: A New Goodness-of-fit Measure
Green, C. -E.; Dawson, J. R.; Cunningham, M. R. +3 more
Different combinations of input parameters to filament identification algorithms, such as disperse and filfinder, produce numerous different output skeletons. The skeletons are a one-pixel-wide representation of the filamentary structure in the original input image. However, these output skeletons may not necessarily be a good representation of th…
Segmentation of photospheric magnetic elements corresponding to coronal features to understand the EUV and UV irradiance variability
Giono, G.; Zender, J. J.; Kariyappa, R. +5 more
Context. The magnetic field plays a dominant role in the solar irradiance variability. Determining the contribution of various magnetic features to this variability is important in the context of heliospheric studies and Sun-Earth connection.
Aims: We studied the solar irradiance variability and its association with the underlying magnetic fi…
M32 Analogs? A Population of Massive Ultra-compact Dwarf and Compact Elliptical Galaxies in Intermediate-redshift Clusters
Bell, Eric F.; Zhang, Yuanyuan
We report the discovery of relatively massive, M32-like ultra compact dwarf (UCD) and compact elliptical (CE) galaxy candidates in 0.2< z< 0.6 massive galaxy clusters imaged by the Cluster Lensing And Supernova survey with Hubble (CLASH) survey. Examining the nearly unresolved objects in the survey, we identify a sample of compact objects co…
Exploring the multifaceted circumstellar environment of the luminous blue variable HR Carinae
Umana, G.; Agliozzo, C.; Riggi, S. +9 more
We present a multiwavelength study of the Galactic luminous blue variable HR Carinae, based on new high-resolution mid-infrared (IR) and radio images obtained with the Very Large Telescope (VLT) and the Australia Telescope Compact Array (ATCA), which have been complemented by far-infrared Herschel-Photodetector Array Camera and Spectrometer (PACS)…