Search Publications
The collisional and photoionized plasma in the polarized NLS1 galaxy Mrk 1239
Komossa, S.; Grupe, D.; Gallo, Luigi C. +4 more
Mrk 1239 is a highly polarized NLS1 in the optical band, whose 0.3-3 keV spectrum has remained remarkably consistent over more than two decades of observation. Previous analysis of this object suggested that the soft X-ray band was dominated by emission lines (collisionally and/or photoionized) from the distant host galaxy as the X-ray emission fr…
Development of a new Phobos spectral simulant: spectral properties from visible to the mid-infrared range
Barucci, M. A.; Fornasier, S.; Doressoundiram, A. +6 more
Phobos is the target of the Martian Moons eXploration (MMX), the next sample return mission of the Japanese space agency (JAXA). The mission will investigate the origin of Phobos and Deimos - the two martian moons, using a suite of dedicated instruments. Infrared analysis of the surface composition will be performed by the MIRS spectrometer onboar…
Will ALMA reveal the true core mass function of protoclusters?
Juvela, M.; Pelkonen, V. -M.; Haugbølle, T. +2 more
Characterizing pre-stellar cores in star-forming regions is an important step towards the validation of theoretical models of star formation. Due to their sub-arcsecond resolution, ALMA observations can potentially provide samples of pre-stellar cores up to distances of a few kpc, where regions of massive star formation can be targeted. However, t…
A Chandra X-ray study of millisecond pulsars in the globular cluster Omega Centauri: a correlation between spider pulsar companion mass and X-ray luminosity
Zhao, Jiaqi; Heinke, Craig O.
Millisecond pulsars (MSPs) are faint X-ray sources commonly observed in Galactic globular clusters (GCs). In this work, we investigate 18 MSPs newly found in the GC Omega Centauri (ω Cen) and search for their X-ray counterparts using Chandra observations with a total exposure time of 290.9 ks. We identify confident X-ray counterparts for 11 of the…
A GALEX view of the DA white dwarf population
Bergeron, P.; Wall, Renae E.; Kilic, Mukremin +1 more
We present a detailed model atmosphere analysis of 14001 DA white dwarfs from the Montreal White Dwarf Database with ultraviolet photometry from the GALEX mission. We use the 100 pc sample, where the extinction is negligible, to demonstrate that there are no major systematic differences between the best-fitting parameters derived from optical only…
Investigation of a small X-ray flaring event in NLS1 galaxy NGC 4051
Naik, Sachindra; Jana, Arghajit; Kumari, Neeraj +1 more
We performed a detailed broad-band spectral and timing analysis of a small flaring event of ~120 ks in the narrow-line Seyfert 1 galaxy NGC 4051 using simultaneous XMM-Newton and NuSTAR observations. The ~300 ks long NuSTAR observation and the overlapping XMM-Newton exposure were segregated into pre-flare, flare, and post-flare segments. During th…
The TESS Triple-9 Catalog II: a new set of 999 uniformly vetted exoplanet candidates
Quintana, Elisa V.; Cacciapuoti, Luca; Kostov, Veselin +20 more
The Transiting Exoplanet Survey Satellite (TESS) mission is providing the scientific community with millions of light curves of stars spread across the whole sky. Since 2018, the telescope has detected thousands of planet candidates that need to be meticulously scrutinized before being considered amenable targets for follow-up programs. We present…
A high-resolution extinction mapping technique for face-on disc galaxies
Peretto, Nicolas; Smith, Matthew W. L.; Davis, Timothy A. +5 more
We present a new dust extinction technique with which we are able to retrieve parsec-scale gas surface density maps for entire nearby galaxies. The method measures the dust attenuation in optical bands on a pixel-by-pixel basis against a smoothed, reconstructed stellar distribution. The contribution of foreground light along the line-of-sight is c…
Photometric metallicities of fundamental-mode RR Lyr stars from Gaia G band photometry of globular-cluster variables
Hajdu, Gergely; Jurcsik, Johanna
Photometric metallicity formulae of fundamental-mode RR Lyr (RRab) stars are presented using globular-cluster data exclusively. The aim is to check whether this selection may help increasing the overall accuracy of the fits and eliminating the systematic bias of the photometric results, namely that they tend to overestimate [Fe/H] of the most meta…
Comprehensive spectroscopic and photometric study of pulsating eclipsing binary star AI Hya
Handler, G.; Kambe, E.; Giarrusso, M. +9 more
The pulsating eclipsing binaries are remarkable systems that provide an opportunity to probe the stellar interior and to determine the fundamental stellar parameters precisely. Especially the detached eclipsing binary systems with (a) pulsating component(s) are significant objects to understand the nature of the oscillations since the binary effec…