Galaxies

Blogs about galaxies, singles ones on in clusters

HDUV GOODS-North Field Compass (Image NASA, ESA, P. Oesch (University of Geneva), and M. Montes (University of New South Wales))

An article published in the journal “Astrophysical Journal Supplement Series” presents the Hubble Deep UV (HDUV) Legacy Survey program, a great panorama of the universe’s evolutionary history based on observations carried out with the Hubble Space Telescope. A team of researchers exploited Hubble’s ultraviolet detection capabilities, combining it with infrared and visible light observations, also from other telescopes, to extend previous surveys with a field of view that includes about 15,000 galaxies, including 12,000 in which there’s star formation.

A Hot DOG galaxy seen at X-rays

An article to be published in the journal “Astronomy & Astrophysics” describes the first detailed X-ray observation of a galaxy cataloged as W1835+4355 of a rare type because at its center there’s a quasar of the Hot DOG (Hot Dust-Obscured Galaxies) type. A team led by Luca Zappacosta of INAF in Rome, Italy, used data collected by ESA’s XMM-Newton and NASA’s NuSTAR space telescopes to obtain the most accurate X-ray emission detections from a Hot DOG galaxy. This will be useful to better understand the nature of this type of galaxies and the activity of the supermassive black hole at their center.

The sky around NGC 5018

An article accepted for publication in “The Astrophysical Journal” describes the VST Early-type GAlaxy Survey (VEGAS). A team of researchers led by Marilena Spavone from INAF-Astronomical Observatory of Capodimonte in Naples, Italy, used ESO’s VLT Survey Telescope (VST) in Chile to obtain highly detailed images of many elliptical galaxies. Among them there’s NGC 5018, interesting among other things for structures such as what’s called a tidal tail, a stream of gas containing various stars stretching outwards from that galaxy. These are evidence of interactions between galaxies that provide information on the characteristics of primordial galaxies.

Artist's concept of a blazar emitting neutrinos and gamma rays (Image courtesy IceCube/NASA)

Various articles published in different journals shows various aspects of a research that allowed to associate a neutrino detected by the IceCube instrument at the South Pole to the blazar known as TXS 0506+056. In an article published in February 2018 in “The Astrophysical Journal Letters” a team led by Simona Paiano of the INAF of Padua showed that connection. In two articles just published in the journal “Science”, groups of scientists from 18 different observatories describe what was defined multimessenger observations of neutrino and electromagnetic emissions and a second analysis showing that other neutrinos detected by IceCube came from the same source.

Artist's impressione of the Milky Way and the Sausage dwarf galaxy (Image courtesy V. Belokurov (Cambridge, UK); Based on image by ESO/Juan Carlos Muñoz)

A series of articles published in the journals “Monthly Notices of the Royal Astronomical Society” and “The Astrophysical Journal Letters” or on the arXiv website describe various aspects of a study on the consequences of the merger of the Milky Way and a dwarf galaxy nicknamed Sausage. A team of astronomers used data collected by ESA’s Gaia space probe to reconstruct that event from 8-10 billion years ago that profoundly influenced the Milky Way.