All posts; Tags Include "Galaxy Evolution"
- January 31, 2010
- 07:25 AM
- 243 views
Shape matters in black hole growth
by sarah in SarahAskew
Active galaxies have gone by many names: active galactic nuclei, quasars, QSOs, Seyfert galaxies, radio galaxies. Astronomers used to think these were all distinct types of objects, unified by the observation of large amounts of energy emerging from a compact region at the centre of the galaxy. These days, despite a great variety in observational [...]... Read more »
Kevin Schawinski, C. Megan Urry, Shanil Virani, Paolo Coppi, Steven P. Bamford, Ezequiel Treister, Chris J. Lintott, Marc Sarzi, William C. Keel, Sugata Kaviraj.... (2010) Galaxy Zoo: The fundamentally different co-evolution of supermassive black holes and their early- and late-type host galaxies. accepted to ApJ. arXiv: 1001.3141v1
- October 26, 2009
- 02:22 AM
- 294 views
A surprisingly compact early galaxy
by Charles Daney in Science and Reason
Astronomers are beginning to learn significant details of the structure of galaxies in the early universe. And what they're learning is rather surprising: at least some early galaxies are almost as massive as otherwise similar galaxies in the present universe, yet they are much smaller in linear size, by a factor of five, thus much more compact.What time period are we talking about here? It's not actually the time that the earliest galaxies formed, which was less than a billion years after the b........ Read more »
van Dokkum, P., Kriek, M., & Franx, M. (2009) A high stellar velocity dispersion for a compact massive galaxy at redshift z . Nature, 460(7256), 717-719. DOI: 10.1038/nature08220
- October 3, 2009
- 03:52 PM
- 615 views
Puffing up elliptical galaxies
by sarah in SarahAskew
Elliptical galaxies are the boring uncles of the galaxy family: they’re amorphous blobby things, ubiquitous in the Universe, that contain a fairly uniform population of old, red stars. Without the interstellar gas and dust that is needed to harbour pretty sites of star formation, they are supremely unphotogenic. But they have far more going on [...]... Read more »
Damjanov, I., & et al. (2009) Red nuggets at z~1.5: Compact passive galaxies and the formation of the Kormendy relation. The Astrophysical Journal, 695(1), 101-115. DOI: 10.1088/0004-637X/695/1/101
Bezanson, R., van Dokkum, P., Tal, T., Marchesini, D., Kriek, M., Franx, M., & Coppi, P. (2009) The relation between compact, quiescent high-redshift galaxies and massive nearby elliptical galaxies: Evidence for hierarchical, inside-out growth. The Astrophysical Journal, 697(2), 1290-1298. DOI: 10.1088/0004-637X/697/2/1290
Fan, L., Lapi, A., De Zotti, G., & Danese, L. (2008) The Dramatic Size Evolution of Elliptical Galaxies and the Quasar Feedback. The Astrophysical Journal, 689(2). DOI: 10.1086/595784
Glazebrook, K. (2009) Galaxy formation: Too small to ignore. Nature, 460(7256), 694-695. DOI: 10.1038/460694a
Tomonori Totani. (2009) Size Evolution of Early-Type Galaxies and Massive Compact Objects as the Dark Matter. PASJ. arXiv: 0908.3295v1
- September 13, 2009
- 02:44 PM
- 510 views
Revamped Hubble breaks new ground
by sarah in SarahAskew
Quick on the heels of NASA’s showcasing of the first images taken by a reborn Hubble Space Telescope come a pair of papers posted to astro-ph showing a glimpse of Hubble potential new power. These papers, by a collaboration of US, Swiss and Dutch astronomers, report the detection of galaxies using Hubble’s new optical/infrared camera [...]... Read more »
R. J. Bouwens, G. D. Illingworth, P. A. Oesch, M. Stiavelli, P. van Dokkum, M. Trenti, D. Magee, I. Labbe, M. Franx, & M. Carollo. (2009) z~8 galaxies from ultra-deep WFC3/IR Observations over the HUDF. ApJL. arXiv: 0909.1803v1
P. A. Oesch, R. J. Bouwens, G. D. Illingworth, C. M. Carollo, M. Franx, I. Labbe, D. Magee, M. Stiavelli, M. Trenti, & P. G. van Dokkum. (2009) z~7 Galaxies in the HUDF: First Epoch WFC3/IR Results. ApJL (submitted). arXiv: 0909.1806v1
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