The centre of the galaxy NGC 5643 has been chosen as an ESO Picture of the Week

Centre of NGC 5643 observed by ALMA and VLT. Credit: ESO/A. Alonso-Herrero et al.; ALMA (ESO/NAOJ/NRAO)

This ESO Picture of the Week shows the centre of a galaxy named NGC 5643. This galaxy is located 55 million light-years from Earth in the constellation of Lupus (The Wolf), and is known as a Seyfert galaxy. Seyfert galaxies have very luminous centres — thought to be powered by material being accreted onto a supermassive black hole lurking within — that can also be shrouded and obscured by clouds of dust and intergalactic material. Continue reading

The James Webb Space Telescope (JWST) passes another milestone

NASA’s James Webb Space Telescope is unloaded from a U.S. military C-5 Charlie aircraft at Los Angeles International Airport (LAX) on Feb. 2, 2018. Credits: NASA/Chris Gunn

The optics and scientific instrumentation (OTIS) of JWST arrived yesterday in the facilities
of Northrop Grumman in California, where the rest of the spacecraft (solar shields, communication elements, etc) is already. The OTIS passed the final performance tests
last year at NASAS’s Johnson Space Center in Houston, Texas. The spacecraft bus
and solar shields still need to perform a series of tests before the integration, however. Continue reading

A 100 kpc nebula associated with the “Teacup” fading quasar

HST image and GTC/OSIRIS spectra of the “Teacup” containing the Hα+[NII] lines. We highlight prominent emission line features such as the NE and SW bubbles. For further details, see Villar-Martín et al. 2017.

The “Teacup” (SDSS J143029.88+133912.0 at z=0.085) is a nearby quasar, whose nickname comes from the peculiar morphology of the extended ionized gas. It shows a loop-shaped structure reminiscent of a teacup “`handle” which extends up to ~12 kpc (~39,000 light years) NE of the active galactic nucleus. Continue reading

First detection of the 448 GHz H2O transition in space

Left: Map of the 448 GHz (rest frequency) continuum (top panel) and zeroth moment of the H2O 423 − 330 emission (bottom panel) of ESO 320-G030. Right: Continuum subtracted profile of the H2O 423 − 330 448 GHz emission. See Pereira-Santaella et al. 2017 for further details.

Water is a key molecule to probe dense and warm regions in the interstellar medium, because of its chemistry as well as its coupling to the far-infrared. This work presents the first detection of the ortho-H2O 4_23 – 3_30 transition at 448 GHz in space. Continue reading

The response of relativistic outflowing gas to the inner accretion disk of a black hole

Artist impression illustrating a super-massive black hole with X-ray emission emanating from its inner region (pink) and ultrafast winds streaming from the surrounding disk (purple). Credit: ESA

Active Galactic Nuclei (AGN) are thought to have a profound effect on large scales through feedback mechanisms. AGN gas outflows release vast amounts of energy into the interstellar medium and can clear out the surrounding gas, possibly regulating star formation in the host galaxy as well as preventing further gas accretion onto the black hole. Such feedback may well contribute to the intimate observed relationship between the central black hole and the host galaxy properties.

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Molecular gas in the halo fuels the growth of a massive cluster galaxy at high redshift

 

Molecular gas on multiple scales in the Spiderweb galaxy

The largest galaxies in the universe reside in galaxy clusters. Using sensitive observations of carbon monoxide, we show that the Spiderweb galaxy—a massive galaxy in a distant protocluster—is forming from a large reservoir of molecular gas. Most of this molecular gas lies between the protocluster galaxies and has low velocity dispersion, indicating that it is part of an enriched intergalactic medium. This may constitute the reservoir of gas that fuels the widespread star formation seen in earlier ultraviolet observations of the Spiderweb galaxy. Our results support the notion that giant galaxies in clusters formed from extended regions of recycled gas at high redshift.

Dusty doughnut around massive black hole spied for first time

The dust continuum emission at 694 GHz mapped by ALMA in the CND of NGC1068. See García-Burillo et al. 2016 for further details.

The dust continuum emission at 694 GHz mapped by ALMA in the circumnuclear disk of NGC1068. See García-Burillo et al. 2016 for further details.

An international team of astronomers lead by the spanish astronomer Santiago García-Burillo (OAN, Madrid), and with the participation of CAB scientists (Almudena Alonso Herrero and Luis Colina), have been able to resolve for the first time the dusty torus around the massive black hole in the nucleus of the nearby active galaxy NGC 1068.

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