Search Publications
Multifractal analysis of the interstellar medium: first application to Hi-GAL observations
Hennebelle, Patrick; Elia, Davide; Molinari, Sergio +6 more
The multifractal geometry remains an underexploited approach to describe and quantify the large-scale structure of interstellar clouds. In this paper, the typical tools of multifractal analysis are applied to Herschel far-infrared (70-500µ m) dust continuum maps, which represent an ideal case of study. This dust component is a relatively opt…
Searching for signatures of dark matter-dark radiation interaction in observations of large-scale structure
Knox, Lloyd; Pan, Zhen; Kaplinghat, Manoj
In this paper, we conduct a search in the latest large-scale structure measurements for signatures of the dark matter-dark radiation interaction proposed by Buen-Abad et al. (2015). We show that prior claims of an inference of this interaction at ∼3 σ significance rely on a use of the Sunyaev-Zeldovich cluster mass function that ignores uncertaint…
The High Cadence Transit Survey (HiTS): Compilation and Characterization of Light-curve Catalogs
Pignata, Giuliano; Galbany, Lluis; González-Gaitán, Santiago +12 more
The High Cadence Transient Survey (HiTS) aims to discover and study transient objects with characteristic timescales between hours and days, such as pulsating, eclipsing, and exploding stars. This survey represents a unique laboratory to explore large etendue observations from cadences of about 0.1 days and test new computational tools for the ana…
Mystery solved: discovery of extended radio emission in the merging galaxy cluster Abell 2146
Fabian, A. C.; Hlavacek-Larrondo, J.; van Weeren, R. J. +11 more
Abell 2146 (z = 0.232) is a massive galaxy cluster currently undergoing a spectacular merger in the plane of the sky with a bullet-like morphology. It was the first system in which both the bow and upstream shock fronts were detected at X-ray wavelengths (Mach ∼2), yet deep Giant MetreWave Telescope 325 MHz observations failed to detect extended r…
Balmer-dominated Shocks Exclude Hot Progenitors for Many Type Ia Supernovae
Badenes, C.; Gilfanov, M.; Woods, T. E. +1 more
The evolutionary mechanism underlying Type Ia supernova explosions remains unknown. However, recent efforts to constrain progenitor models based on the influence that their high energy emission would have on the interstellar medium within galaxies have proven successful. For individual remnants, Balmer-dominated shocks reveal the ionization state …
Ultraviolet spectral reflectance of carbonaceous materials
Gillis-Davis, Jeffrey J.; Hendrix, Amanda R.; Roush, Ted L. +5 more
A number of planetary spacecraft missions have carried instruments with sensors covering the ultraviolet (UV) wavelength range. However, there exists a general lack of relevant UV reflectance laboratory data to compare against these planetary surface remote sensing observations in order to make confident material identifications. To address this n…
The Progenitor Age and Mass of the Black Hole Formation Candidate N6946-BH1
Dolphin, Andrew E.; Díaz-Rodríguez, Mariangelly; Murphy, Jeremiah W. +3 more
The failed supernova N6946-BH1 likely formed a black hole (BH); we age-date the surrounding population and infer an age and initial mass for the progenitor of this BH formation candidate. First, we use archival Hubble Space Telescope imaging to extract broadband photometry of the resolved stellar populations surrounding this event. Using this phot…
Gamma-ray observations of Nova Sgr 2015 No. 2 with INTEGRAL
Starrfield, Sumner; Savchenko, Volodymyr; Diehl, Roland +11 more
Context. INTEGRAL observed Nova Sgr 2015 No. 2 (V5668 Sgr) around the time of its optical emission maximum on 21 March 2015. Studies at UV wavelengths showed spectral lines of freshly produced 7Be. This could also be measurable in gamma rays at 478 keV from the decay to 7Li. Novae are also expected to synthesise 22…
A new ultraluminous X-ray source in the galaxy NGC 5907
Salvaterra, R.; Tiengo, A.; Israel, G. +14 more
We report on the serendipitous discovery of a new transient in NGC 5907, at a peak luminosity of 6.4 × 1039 erg s-1. The source was undetected in previous 2012 Chandra observations with a 3σ upper limit on the luminosity of 1.5 × 1038 erg s-1, implying a flux increase of a factor of >35. We analysed t…
Constraining Gravity at Large Scales with the 2MASS Photometric Redshift Catalog and Planck Lensing
Reichardt, Christian L.; Bianchini, Federico
We present a new measurement of structure growth at z ≃ 0.08 obtained by correlating the cosmic microwave background (CMB) lensing potential map from the Planck satellite with the angular distribution of the 2MASS Photometric Redshift galaxies. After testing for, and finding no evidence for systematic effects, we calculate the angular auto- and cr…