Have had to turn the brightnesses on my phone up to high
26 May 2012, 9:06 am
Have had to turn the brightnesses on my phone up to high

God, i knew that u are my father and my bestfriend :) be with me today and let ur brightnesses shine on me!! Amen.
23 May 2012, 4:35 pm
God, i knew that u are my father and my bestfriend :) be with me today and let ur brightnesses shine on me!! Amen.

The optically unbiased GRB host (TOUGH) survey. V. VLT/X-shooter emission-line redshifts for Swift GRBs at z~2. (arXiv:1205.4036v1 [astro-ph.CO])
20 May 2012, 8:05 pm
Brown astroph The optically unbiased GRB host (TOUGH) survey. V. VLT/X-shooter emission-line redshifts for Swift GRBs at z~2. (arXiv:1205.4036v1 [astro-ph.CO]) - http://arxiv.org/abs/1205.4036 May 20 from astro-ph updates on arXiv.org - Comment - Like Authors: Thomas Krühler, Daniele Malesani, Bo Milvang-Jensen, Johan P. U. Fynbo, Jens Hjorth, Páll Jakobsson, Andrew J. Levan, Martin Sparre, Nial R. Tanvir, Darach J. Watson We present simultaneous optical and near-infrared (NIR) spectroscopy of 19 Swift GRB host galaxies with VLT/X-shooter with the aim of measuring their redshifts. Galaxies were selected from The Optically Unbiased GRB Host (TOUGH) survey (15 of the 19 galaxies) or because they hosted GRBs without a bright optical afterglow. Here, we provide emission-line redshifts for 13 of the observed galaxies with brightnesses between F606W > 27 mag and R=22.9 mag (median R=24.6 mag). The median redshift is z=2.1 for all, and z=2.3 for the TOUGH hosts. Our new data significantly improve the redshift completeness of the TOUGH survey, which now stands at 77% (53 out of 69 GRBs). They furthermore provide accurate redshifts for eight prototype-dark GRBs (e.g., GRBs 071021 at z=2.452 and 080207 at z=2.086), which are exemplary of... - Alex

The optically unbiased GRB host (TOUGH) survey. V. VLT/X-shooter emission-line redshifts for Swift GRBs at z~2. (arXiv:1205.4036v1 [astro-ph.CO])
20 May 2012, 8:05 pm
Brown astro-ph The optically unbiased GRB host (TOUGH) survey. V. VLT/X-shooter emission-line redshifts for Swift GRBs at z~2. (arXiv:1205.4036v1 [astro-ph.CO]) - http://arxiv.org/abs/1205.4036 May 20 from astro-ph updates on arXiv.org - Comment - Like Authors: Thomas Krühler, Daniele Malesani, Bo Milvang-Jensen, Johan P. U. Fynbo, Jens Hjorth, Páll Jakobsson, Andrew J. Levan, Martin Sparre, Nial R. Tanvir, Darach J. Watson We present simultaneous optical and near-infrared (NIR) spectroscopy of 19 Swift GRB host galaxies with VLT/X-shooter with the aim of measuring their redshifts. Galaxies were selected from The Optically Unbiased GRB Host (TOUGH) survey (15 of the 19 galaxies) or because they hosted GRBs without a bright optical afterglow. Here, we provide emission-line redshifts for 13 of the observed galaxies with brightnesses between F606W > 27 mag and R=22.9 mag (median R=24.6 mag). The median redshift is z=2.1 for all, and z=2.3 for the TOUGH hosts. Our new data significantly improve the redshift completeness of the TOUGH survey, which now stands at 77% (53 out of 69 GRBs). They furthermore provide accurate redshifts for eight prototype-dark GRBs (e.g., GRBs 071021 at z=2.452 and 080207 at z=2.086), which are exemplary of... - Alex

brightnesses at St. Oberholz http://t.co/OkJWlwSF
18 May 2012, 7:32 am
brightnesses at St. Oberholz http://t.co/OkJWlwSF

@nerdtalker @richardlai Crafty :) BTW an interesting test would be how fast you get screen burn, colour shift from blue at high brightnesses
18 May 2012, 4:28 am
@nerdtalker @richardlai Crafty :) BTW an interesting test would be how fast you get screen burn, colour shift from blue at high brightnesses

@nerdtalker @richardlai How do you do your brightness measurement on the OLEDs? Some reduce the pixel brightnesses when all screen is white
18 May 2012, 4:18 am
@nerdtalker @richardlai How do you do your brightness measurement on the OLEDs? Some reduce the pixel brightnesses when all screen is white

Fundamentals of the Dwarf Fundamental Plane. (arXiv:1204.1074v1 [astro-ph.CO])
5 April 2012, 8:20 pm
Brown astroph Fundamentals of the Dwarf Fundamental Plane. (arXiv:1204.1074v1 [astro-ph.CO]) - http://arxiv.org/abs/1204.1074 April 5 from astro-ph updates on arXiv.org - Comment - Like Authors: Marshall L. McCall, O. Vaduvescu, F. Pozo Nunez, A. Barr Dominguez, R. Fingerhut, E. Unda-Sanzana, Bintao Li, M. Albrecht Star-forming dwarfs are studied to elucidate the physical underpinnings of their fundamental plane. It is confirmed that residuals in the Tully-Fisher relation are correlated with surface brightness, but that even after accommodating the surface brightness dependence through the dwarf fundamental plane, residuals in absolute magnitude are far larger than expected from observational errors. Rather, a more fundamental plane is identified which connects the potential to HI line width and surface brightness. Residuals correlate with the axis ratio in a way which can be accommodated by recognizing the galaxies to be oblate spheroids viewed at varying angles. Correction of surface brightnesses to face-on leads to a correlation among the potential, line width, and surface brightness for which residuals are entirely attributable to observational uncertainties. The... - Alex

Fundamentals of the Dwarf Fundamental Plane. (arXiv:1204.1074v1 [astro-ph.CO])
5 April 2012, 8:20 pm
Brown astro-ph Fundamentals of the Dwarf Fundamental Plane. (arXiv:1204.1074v1 [astro-ph.CO]) - http://arxiv.org/abs/1204.1074 April 5 from astro-ph updates on arXiv.org - Comment - Like Authors: Marshall L. McCall, O. Vaduvescu, F. Pozo Nunez, A. Barr Dominguez, R. Fingerhut, E. Unda-Sanzana, Bintao Li, M. Albrecht Star-forming dwarfs are studied to elucidate the physical underpinnings of their fundamental plane. It is confirmed that residuals in the Tully-Fisher relation are correlated with surface brightness, but that even after accommodating the surface brightness dependence through the dwarf fundamental plane, residuals in absolute magnitude are far larger than expected from observational errors. Rather, a more fundamental plane is identified which connects the potential to HI line width and surface brightness. Residuals correlate with the axis ratio in a way which can be accommodated by recognizing the galaxies to be oblate spheroids viewed at varying angles. Correction of surface brightnesses to face-on leads to a correlation among the potential, line width, and surface brightness for which residuals are entirely attributable to observational uncertainties. The... - Alex

HST/ACS Photometry of Old Stars in NGC 1569: The Star Formation History of a Nearby Starburst. (arXiv:1204.0989v1 [astro-ph.GA])
4 April 2012, 7:52 pm
Brown astroph HST/ACS Photometry of Old Stars in NGC 1569: The Star Formation History of a Nearby Starburst. (arXiv:1204.0989v1 [astro-ph.GA]) - http://arxiv.org/abs/1204.0989 April 4 from astro-ph updates on arXiv.org - Comment - Like Authors: Aaron J. Grocholski, Roeland P. van der Marel, Alessandra Aloisi, Francesca Annibali, Laura Greggio, Monica Tosi (abridged) We used HST/ACS to obtain deep V- and I-band images of NGC 1569, one of the closest and strongest starburst galaxies in the Universe. These data allowed us to study the underlying old stellar population, aimed at understanding NGC 1569's evolution over a full Hubble time. We focus on the less-crowded outer region of the galaxy, for which the color-magnitude diagram (CMD) shows predominantly a red giant branch (RGB) that reaches down to the red clump/horizontal branch feature (RC/HB). A simple stellar population analysis gives clear evidence for a more complicated star formation history (SFH) in the outer region. We derive the full SFH using a newly developed code, SFHMATRIX, which fits the CMD Hess diagram by solving a non-negative least squares problem. Our analysis shows that the relative brightnesses of the RGB tip and RC/HB, along with the curvature... - Alex