Search Publications
Study of the X-ray properties of the neutron star binary 4U 1728-34 from the soft-to-hard state
Motta, S. E.; Belloni, T. M.; Méndez, Mariano +7 more
We studied five XMM-Newton observations of the neutron star binary 4U 1728-34 covering the hard, intermediate and soft spectral states. By jointly fitting the spectra with several reflection models, we obtained an inclination angle of 25°-53° and an iron abundance up to 10 times the solar. From the fits with reflection models, we found that the fl…
A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959
Brunetti, G.; Shimwell, T. W.; Cassano, R. +9 more
The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, we present new detections of both a radio halo (with a spectral index of α _{143}^{1400}=1.48^{+0.06}_{-0.23}) and a likely ra…
Probing X-ray emission in different modes of PSR J1023+0038 with a radio pulsar scenario
Campana, S.; Torres, D. F.; Papitto, A. +3 more
Transitional pulsars provide us with a unique laboratory to study the physics of accretion onto a magnetic neutron star. PSR J1023+0038 (J1023) is the best studied of this class. We investigate the X-ray spectral properties of J1023 in the framework of a working radio pulsar during the active state. We modelled the X-ray spectra in three modes (lo…
ALMA Reveals Kinematics of Super Star Cluster Candidate H72.97-69.39 in LMC-N79
Indebetouw, R.; Nayak, O.; Meixner, M. +6 more
Conditions in super star clusters (SSCs) lead to the formation of dozens of massive stars in close proximity. However, SSCs are rare in the local universe. H72.97-69.39, located in the N79 region of the Large Magellanic Cloud (LMC), is an SSC candidate. In this paper we report the ALMA observations of the potential SSC. ALMA reveals colliding fila…
A compact jet at the infrared heart of the prototypical low-luminosity AGN in NGC 1052
Tristram, K. R. W.; Prieto, M. A.; Asmus, D. +4 more
The feeble radiative efficiency characteristic of Low-Luminosity Active Galactic Nuclei (LLAGNs) is ascribed to a sub-Eddington accretion rate, typically at log (Lbol/Ledd) ≲ -3. At the finest angular resolutions that are attainable nowadays using mid-infrared (mid-IR) interferometry, the prototypical LLAGN in NGC 1052 remain…
Hubble Ultraviolet Spectroscopy of Jupiter Trojans
Ehlmann, Bethany L.; Brown, Michael E.; Mahjoub, Ahmed +2 more
We present the first ultraviolet spectra of Jupiter Trojans. These observations were carried out using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope and cover the wavelength range 200-550 nm at low resolution. The targets include objects from both of the Trojan color subpopulations (less-red and red). We do not observe any…
Variability of young stellar objects in the star-forming region Pelican Nebula
Chen, W. P.; Herczeg, G. J.; Bhardwaj, A. +2 more
Context. Pre-main-sequence variability characteristics can be used to probe the physical processes leading to the formation and initial evolution of both stars and planets.
Aims: The photometric variability of pre-main-sequence stars is studied at optical wavelengths to explore star-disk interactions, accretion, spots, and other physical mech…
Antlia 2’s Role in Driving the Ripples in the Outer Gas Disk of the Galaxy
Hernquist, Lars; Price-Whelan, Adrian M.; Chang, Philip +3 more
We employ the earlier published proper motions of the newly discovered Antlia 2 dwarf galaxy derived from Gaia data to calculate its orbital distribution in the cosmologically recent past. Using these observationally motivated orbits, we calculate the effect of the Antlia 2 dwarf galaxy on the outer H I disk of the Milky Way, using both test parti…
Hyperluminous starburst gives up its secrets
Ivison, R. J.; Page, M. J.; Mainieri, V. +4 more
HATLAS J084933.4 + 021443 was identified as a dusty starburst via its rest-frame far-infrared (far-IR) emission. Multifrequency imaging and spectroscopy revealed a cluster of four dusty galaxies at z = 2.41, covering 80 kpc. Here, we use Atacama Large Millimetre Array to confirm a more distant, fifth protocluster member, and present X-ray and rest…
Learning mid-IR emission spectra of polycyclic aromatic hydrocarbon populations from observations
Joblin, C.; Berné, O.; Foschino, S.
Context. The James Webb Space Telescope (JWST) will deliver an unprecedented quantity of high-quality spectral data over the 0.6-28 µm range. It will combine sensitivity, spectral resolution, and spatial resolution. Specific tools are required to provide efficient scientific analysis of such large data sets.
Aims: Our aim is to illustra…