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MC2: Multiwavelength and Dynamical Analysis of the Merging Galaxy Cluster ZwCl 0008.8+5215: An Older and Less Massive Bullet Cluster
Dawson, William A.; Jee, M. James; van Weeren, Reinout J. +2 more
We present and analyze a rich data set including Subaru/SuprimeCam, HST/Advanced Camera for Surveys and Wide Field Camera 3, Keck/DEIMOS, Chandra/ACIS-I, and JVLA/C and D array for the merging cluster of galaxies ZwCl 0008.8+5215. With a joint Subaru+HST weak gravitational lensing analysis, we identify two dominant subclusters and estimate the mas…
Constraining the ΛCDM and Galileon models with recent cosmological data
Möller, A.; Astier, P.; Guy, J. +4 more
Aims: The Galileon theory belongs to the class of modified gravity models that can explain the late-time accelerated expansion of the Universe. In previous works, cosmological constraints on the Galileon model were derived, both in the uncoupled case and with a disformal coupling of the Galileon field to matter. There, we showed that these mo…
IRIS Burst Spectra Co-spatial to a Quiet-Sun Ellerman-like Brightening
Erdélyi, R.; Mathioudakis, M.; Oliver, R. +3 more
Ellerman bombs (EBs) have been widely studied over the past two decades; however, only recently have the counterparts of these events been observed in the quiet-Sun. The aim of this article is to further understand small-scale quiet-Sun Ellerman-like brightenings (QSEBs) through research into their spectral signatures, including investigating whet…
Polarimetry at millimeter wavelengths with the NIKA camera: calibration and performance
Adam, R.; Benoît, A.; Catalano, A. +37 more
Magnetic fields, which play a major role in a large number of astrophysical processes can be traced via observations of dust polarization. In particular, Planck low-resolution observations of dust polarization have demonstrated that Galactic filamentary structures, where star formation takes place, are associated to well organized magnetic fields.…
Impact of theoretical priors in cosmological analyses: The case of single field quintessence
Peirone, Simone; Raveri, Marco; Silvestri, Alessandra +1 more
We investigate the impact of general conditions of theoretical stability and cosmological viability on dynamical dark energy models. As a powerful example, we study whether minimally coupled, single field quintessence models that are safe from ghost instabilities, can source the Chevallier-Polarski-Linder (CPL) expansion history recently shown to …
Modeling the Gravitational Potential of a Cosmological Dark Matter Halo with Stellar Streams
Helmi, Amina; Sanderson, Robyn E.; Hartke, Johanna
Stellar streams result from the tidal disruption of satellites and star clusters as they orbit a host galaxy, and can be very sensitive probes of the gravitational potential of the host system. We select and study narrow stellar streams formed in a Milky-Way-like dark matter halo of the Aquarius suite of cosmological simulations, to determine if t…
A Suzaku, NuSTAR, and XMM-Newton view on variable absorption and relativistic reflection in NGC 4151
Dauser, T.; Wilms, J.; Kadler, M. +6 more
We disentangle X-ray disk reflection from complex line-of-sight absorption in the nearby Seyfert NGC 4151, using a suite of Suzaku, NuSTAR, and XMM-Newton observations. Extending upon earlier published work, we pursue a physically motivated model using the latest angle-resolved version of the lamp-post geometry reflection model relxillCp_lp togeth…
Hierarchical star formation across the grand-design spiral NGC 1566
Gouliermis, Dimitrios A.; Grebel, Eva K.; Smith, Linda J. +19 more
We investigate how star formation is spatially organized in the grand-design spiral NGC 1566 from deep Hubble Space Telescope photometry with the Legacy ExtraGalactic UV Survey. Our contour-based clustering analysis reveals 890 distinct stellar conglomerations at various levels of significance. These star-forming complexes are organized in a hiera…
Probing cosmological isotropy with Planck Sunyaev-Zeldovich galaxy clusters
Bernui, A.; Ferreira, I. S.; Alcaniz, J. S. +1 more
We probe the statistical isotropy hypothesis of the large-scale structure with the second Planck Sunyaev-Zeldovich (PSZ2) galaxy clusters data set. Our analysis adopts a statistical-geometrical method that compares the two-point angular-correlation function of objects in antipodal patches of the sky. Given possible observational biases, such as th…
A Multi-wavelength Study of the Turbulent Central Engine of the Low-mass AGN Hosted by NGC 404
Davis, Timothy A.; Nguyen, Dieu D.; Nyland, Kristina +9 more
The nearby dwarf galaxy NGC 404 harbors a low-luminosity active galactic nucleus powered by the lowest-mass (<150,000 M ⊙) central massive black hole (MBH), with a dynamical mass constraint, currently known, thus providing a rare low-redshift analog to the MBH “seeds” that formed in the early universe. Here, we present new imaging of…