Science Current Events | Science News | Brightsurf.com
 

Hubble observes a dwarf galaxy with a bright nebula

May 10, 2012
The starry mist streaking across this image obtained by the NASA/ESA Hubble Space Telescope is the central part of the dwarf galaxy known as NGC 2366. The most obvious feature in this galaxy is a large nebula visible in the upper-right part of the image, an object listed just a few entries prior in the New General Catalogue as NGC 2363.

A nearby yellowish swirl is not in fact part of the nebula. It is a spiral galaxy much further away, whose light is shining right through NGC 2366. This is possible because galaxies are not solid objects. While we see the stars because they shine brightly, galaxies are overwhelmingly made up of the empty space between them. Hubble's high-resolution image illustrates this perfectly: the stars are small points of light surrounded by the darkness of space.

The splendid interconnected objects of NGC 2366 and NGC 2363 are located about 10 million light-years away in the constellation of Camelopardalis (the Giraffe). As a dwarf galaxy, NGC 2366's size is in the same ballpark as the two main satellite galaxies of our Milky Way, named the Large and Small Magellanic Clouds. Like the Magellanic clouds, NGC 2366's lack of well-defined structure leads astronomers to further classify it as an irregular galaxy.

Although NGC 2366 might be small by the standards of galaxies, many of its stars are not, and the galaxy is home to numerous gigantic blue stars. The blue dots scattered throughout the galaxy speak to the burst of star formation that the galaxy has undergone in recent cosmic time. A new generation of these stellar titans has lit up the nebula NGC 2363.

In gas-rich star-forming regions, the ultraviolet radiation from young, big, blue stars excites the hydrogen gas, making it glow. NGC 2363, as well as other, smaller patches seen throughout Hubble's image, serve as the latest formation sites for stellar giants.

Imaged through green and infrared filters, these nebulae take on a blueish tinge in this image, though the actual colour is a shade of red.

This image was produced from two adjacent fields observed by Hubble's Advanced Camera for Surveys. The field of view is approximately 5.5 arcminutes across, which is equivalent to a little over a fifth of the diameter of the full Moon. Although this is comparatively large by the standard of Hubble's images, NGC 2366 is much too faint to observe with the naked eye.

ESA/Hubble Information Centre


Related Dwarf Galaxy Current Events and Dwarf Galaxy News Articles


Small but Plentiful: How the Faintest Galaxies Illuminated the Early Universe
Light from tiny galaxies more than 13 billion years ago played a larger role than previously thought in creating the conditions in the universe as we know it today, according to a new study by researchers at the Georgia Institute of Technology and the San Diego Supercomputer Center (SDSC) at the University of California, San Diego.

Failed dwarf galaxy survives galactic collision thanks to full dark-matter jacket
Like a bullet wrapped in a full metal jacket, a high-velocity hydrogen cloud hurtling toward the Milky Way appears to be encased in a shell of dark matter, according to a new analysis of data from the National Science Foundation's Robert C. Byrd Green Bank Telescope (GBT).

Stream of stars in Andromeda satellite galaxy shows cosmic collision
The Andromeda Galaxy is surrounded by a swarm of small satellite galaxies. Researchers from the Niels Bohr Institute, among others, have detected a stream of stars in one of the Andromeda Galaxy's outer satellite galaxies, a dwarf galaxy called Andromeda II.

ALMA Spots Supernova Dust Factory
Striking new observations with the Atacama Large Millimeter/submillimeter Array (ALMA) telescope capture, for the first time, the remains of a recent supernova brimming with freshly formed dust.

Puzzle of how spiral galaxies set their arms comes into focus
As the shapes of galaxies go, the spiral disk - with its characteristic pinwheel profile - is by far the most pedestrian.

Supernova remnant 1987A continues to reveal its secrets
A team of astronomers led by the International Centre for Radio Astronomy Research (ICRAR) have succeeded in observing the death throws of a giant star in unprecedented detail.

MOND used to predict key property in Andromeda's satellites
Using modified laws of gravity, researchers from Case Western Reserve University and Weizmann Institute of Science closely predicted a key property measured in faint dwarf galaxies that are satellites of the nearby giant spiral galaxy Andromeda.

Nearby dwarf galaxy and possible protogalaxy discovered Optical and radio telescopes lead to finds, reconstruction of intergalactic traffic jam
Peering deep into the dim edges of a distorted pinwheel galaxy in the constellation Ursa Major (the Great Bear), astronomers at Case Western Reserve University and their colleagues have discovered a faint dwarf galaxy and another possible young dwarf caught before it had a chance to form any stars.

NASA's GALEX Reveals the Largest-Known Spiral Galaxy
The spectacular barred spiral galaxy NGC 6872 has ranked among the biggest stellar systems for decades. Now a team of astronomers from the United States, Chile and Brazil has crowned it the largest-known spiral, based on archival data from NASA's Galaxy Evolution Explorer (GALEX) mission, which has since been loaned to the California Institute of Technology, Pasadena, Calif.

Most-distant galaxy candidate found
A team of astronomers including Carnegie's Daniel Kelson have set a new distance record for finding the farthest galaxy yet seen in the universe.
More Dwarf Galaxy Current Events and Dwarf Galaxy News Articles

Galaxies

Galaxies
by Seymour Simon (Author)


This close-up look at our own Milky Way and other enormous clusters of stars describes the many different types of galaxies, how they were formed, and how they got their different shapes. "A dazzling photo-essay."--School Library Journal.

Pluto: A Dwarf Planet (Exploring the Galaxy)

Pluto: A Dwarf Planet (Exploring the Galaxy)
by Thomas K. Adamson (Author)


Pluto is now a dwarf planet. Learn more about the fascinating, cold world of Pluto.

Stars and Galaxies

Stars and Galaxies
by Michael A. Seeds (Author), Dana Backman (Author)


With this newly revised Eighth Edition of STARS AND GALAXIES, the authors' goals are to help you use astronomy to understand science--and use science to understand what we are. Fascinating, engaging, and visually vibrant, this text will help you answer two fundamental questions: What are we? And how do we know?

Low-metallicity Star Formation (IAU S255): From the First Stars to Dwarf Galaxies (Proceedings of the International Astronomical Union Symposia and Colloquia)

Low-metallicity Star Formation (IAU S255): From the First Stars to Dwarf Galaxies (Proceedings of the International Astronomical Union Symposia and Colloquia)
by Leslie K. Hunt (Editor), Suzanne C. Madden (Editor), Raffaella Schneider (Editor)


Although low-mass metal-poor galaxies in the local universe have often been proposed as the 'primordial building blocks' in the hierarchical scenario of structure formation, several lines of evidence suggest that this may not be true. Moreover, it is not clear to what extent dwarf galaxies, because they are metal poor and because of their kinematics and structure, can tell us about how star formation proceeded in the early universe. This volume provides an overview and the most recent advances in this debate. IAU Symposium 255 presents the most up-to-date developments in six key areas, including: Population III and metal-free star formation; metal-enrichment, chemical evolution and feedback; explosive events in low-metallicity environments; dust and gas as seeds for metal-poor star...

Dwarf Galaxies: Keys to Galaxy Formation and Evolution: Proceedings of Symposium 3 of JENAM 2010 (Astrophysics and Space Science Proceedings)

Dwarf Galaxies: Keys to Galaxy Formation and Evolution: Proceedings of Symposium 3 of JENAM 2010 (Astrophysics and Space Science Proceedings)
by Polychronis Papaderos (Editor), Simone Recchi (Editor), Gerhard Hensler (Editor)


Dwarf galaxy research constitutes an extremely vibrant field of astrophysical research, with many long-standing questions still unsettled and new ones constantly arising. The intriguing diversity of the dwarf galaxy population, observed with advanced ground-based and space-borne observatories over a wide spectral window providing an unprecedented level of detail, poses new challenges for both observers and theoreticians.

The aim of this symposium was to bring together these two groups to exchange ideas and new results on the many evolutionary aspects of and open issues concerning dwarf galaxies. The main topics addressed include: the birth of dwarf galaxies: theoretical concepts and observable relics across wavelengths and time, the morphological, structural and chemical evolution...

Scientific American / March, 2014. The New Century of the Brain; Dwarf Galaxies and the Dark Web; Gene Therapy's Second Act; The Oldest Rocks on Earth; The Case of the Stolen Words; The American Chestnut's Genetic Rebirth; Why Good Thoughts Block Better Ones

Scientific American / March, 2014. The New Century of the Brain; Dwarf Galaxies and the Dark Web; Gene Therapy's Second Act; The Oldest Rocks on Earth; The Case of the Stolen Words; The American Chestnut's Genetic Rebirth; Why Good Thoughts Block Better Ones
by Mariette DiChristina (Editor In Chief) (Author)


New York: Scientific American, a Division of Nature America, Inc., 2014. The March, 2014 issue of Scientific American, volume 310, number 3. Quarto, perfect-bound illustrated wraps, 88 pp. As New; pristine and immaculate, with subscriber's pre-printed address label. See scan. Feature articles: The New Century of the Brain; Dwarf Galaxies and the Dark Web; Gene Therapy's Second Act; The Oldest Rocks on Earth; The Case of the Stolen Words; The American Chestnut's Genetic Rebirth; Why Good Thoughts Block Better Ones. Departments: From the Editor, Letters, Science Agenda, Forum, Advances, The Science of Health, Technofiles, Recommended, Skeptic, Anti Gravity, 50, 100, and 150 Years Ago, Graphic Science. LPR3

Mysteries of Galaxy Formation (Springer Praxis Books / Popular Astronomy)

Mysteries of Galaxy Formation (Springer Praxis Books / Popular Astronomy)
by Francoise COMBES (Author)


The mystery of how the galaxies formed is a complex and intriguing subject, involving several different theories and an understanding of many different phenomena. Françoise Combes outlines the context in which the Big Bang and the expansion of the universe occurred and the first ‘inhomogeneities’ from which arose the early structures of the universe. The author describes how, contrary to our everyday experience, space and time appear to be intimately connected. In astronomy, a telescope is a time machine. We can look today at distant galaxies and, although we describe them in the present tense, we are really seeing them in their youthful stages, now long over. Having outlined the evolution and structure of galaxies, black holes are introduced. What do we know about their origins and...

Galaxy Formation and Evolution

Galaxy Formation and Evolution
by Houjun Mo (Author), Frank van den Bosch (Author), Simon White (Author)


The rapidly expanding field of galaxy formation lies at the interface between astronomy, particle physics, and cosmology. Covering diverse topics from these disciplines, all of which are needed to understand how galaxies form and evolve, this book is ideal for researchers entering the field. Individual chapters explore the evolution of the Universe as a whole and its particle and radiation content; linear and nonlinear growth of cosmic structure; processes affecting the gaseous and dark matter components of galaxies and their stellar populations; the formation of spiral and elliptical galaxies; central supermassive black holes and the activity associated with them; galaxy interactions; and the intergalactic medium. Emphasizing both observational and theoretical aspects, this book provides...

Stars and Galaxies

Stars and Galaxies
by Dana Backman (Author), Michael A. Seeds (Author)


Addressing the newest developments and latest discoveries in the exciting study of astronomy, this revised seventh edition of STARS AND GALAXIES helps students use astronomy to understand science and use science to understand what we are. Fascinating and engaging, STARS AND GALAXIES illustrates the scientific method and guides students to answer these fundamental questions: What are we? How do we know? In discussing the interplay between evidence and hypothesis, author Michael Seeds provides not only facts but also a conceptual framework for understanding the logic of science. Coverage includes observations of the shapes of stars; evidence of dark energy, quasars, and galaxy collisions; and a look inside supernova explosions. And whether you choose to assign homework in an online...

Galaxies: A Very Short Introduction

Galaxies: A Very Short Introduction
by John Gribbin (Author)


In this fascinating Very Short Introduction, popular science writer John Gribben tells the story of our growing understanding of galaxies, from the days before Galileo to our present-day observations of our many hundreds of millions of galactic neighbors. Not only are galaxies fascinating astronomical structures in themselves, but their study has revealed much of what we know today about the cosmos, providing a window on the Big Bang and the origins of the Universe. Gribben looks at our own "Milky Way" Galaxy in detail, from the different kinds of stars that are born within it, to the origins of its magnificent spiral structure. Perhaps most interesting, Gribben describes the many exciting discoveries have been made about our own galaxy and about those beyond: how a supermassive black...

© 2014 BrightSurf.com