An enlargement of the Westerlund cluster of stars from the original image, linked below. Credit: ESO
The star at the heart of this story is called Westerlund 1-26 or just W 26, it is about the biggest star we know of in our galaxy. It is some 1,500 + times the size of our sun! As the press release below tells, the star is in the process of dying, surly to become a black hole.
The star W 26 is part of a cluster of stars especially notable because of the large number of very massive stars.
The cluster was discovered in 1961 by Bengt Westerlund. The cluster was difficult to study for a long time because of dust and gas clouds and is one of the reasons distance estimates vary so much, last estimate I saw was a little over 4,900 pc, or around 16,000-light years.
The problem of the gas and dust doesn’t seem to be much of a problem for a very amazing telescope the VLT Survey Telescope. If the telescope isn’t cool enough, the camera on it, the OmegaCAM is incredible!
From the ESO (use this link to see the original image):
This new picture from the VLT Survey Telescope (VST) at ESO’s Paranal Observatory shows the remarkable super star cluster Westerlund 1 (eso1034). This exceptionally bright cluster lies about 16 000 light-years from Earth in the southern constellation of Ara (The Altar). It contains hundreds of very massive and brilliant stars, all of which are just a few million years old — babies by stellar standards. But our view of this cluster is hampered by gas and dust that prevents most of the visible light from the cluster’s stars from getting to Earth.
The Cat’s Paw Nebula is the first for ArTeMis. Credit: ESO et al.
Oh my! Just look at this! The Cat’s Paw Nebula (also known as NGC 6334) is a supernova remnant between about 1,687 parsecs (5500 light-years) away in the constellation Scorpius.
Here’s a SEDS page on NGC 6334, with an older image.
From the ESO:
ArTeMiS  is a new wide-field submillimetre-wavelength camera that will be a major addition to APEX’s suite of instruments and further increase the depth and detail that can be observed. The new generation detector array of ArTeMIS acts more like a CCD camera than the previous generation of detectors. This will let wide-field maps of the sky be made faster and with many more pixels.
Hubble’s view of PGC 10922. Click for larger. ESA/Hubble & NASA, Acknowledgement: Judy Schmidt
Here is an image of PGC 10922. The ESA caption is below but for some other particulars that makes this Hubble view even more outstanding:
The galaxy is located at RA 02h 53m 35.9s and DEC -83d 08m 32s and it’s about 67.92 Mpc away (about 221 million light-years). It shines at a magnitude 13.7 and is small at around one (1) arc minute +/-.
Want a comparison between Hubble and a ground based image? Have a look at this image from the 2MASS 1.3m telescope at the ESO.
One other interesting thing about the image is it is has a redshift velocity (moving away from us) of 4,830 km/second (z = 0.016111), that’s nearly 11 million mph for the metrically challenged.
Here’s the ESA caption (via NASA and you can get different sizes of the image at this link):
The NASA/ESA Hubble Space Telescope has captured this image of PGC 10922, an example of a lenticular galaxy — a galaxy type that lies on the border between ellipticals and spirals.
Seen face-on, the image shows the disk and tightly-wound spiral structures of dark dust encircling the bright center of the galaxy. There is also a remarkable outer halo of faint wide arcs or shells extending outwards, covering much of the picture. These are likely to have been formed by a gravitational encounter or even a merger with another galaxy. Some dust also appears to have escaped from the central structure and has spread out across the inner shells. An extraordinarily rich background of more remote galaxies can also be seen in the image.
ALMA and NTT and a Newborn Star Click for larger. Credit:ESO/ALMA (ESO/NAOJ/NRAO)/H. Arce. Acknowledgements: Bo Reipurth
The Atacama Large Millimeter/submillimeter Array (ALMA) and the 3.58-meter New Technology Telescope (NTT) team up for a very nice look at a newborn star. The colors and filters are explained in the ESO caption below, you might get a better sense of them by going to the ESO website. While you are there you can get desktop versions of the image, it looks good on mine.
Unrelated Observing note: The full moon was quite orange when it was setting this morning. Apparently the color I am seeing is from smoke high in the atmosphere from the fires in western Canada, that according to the local weather guy. He’s good like that, even announces visible Hubble passes.
Here’s the ESO caption:
This unprecedented image of Herbig-Haro object HH 46/47 combines radio observations acquired with the Atacama Large Millimeter/submillimeter Array (ALMA) with much shorter wavelength visible light observations from ESO’s New Technology Telescope (NTT). The ALMA observations (orange and green, lower right) of the newborn star reveal a large energetic jet moving away from us, which in the visible is hidden by dust and gas. To the left (in pink and purple) the visible part of the jet is seen, streaming partly towards us.