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4 results on '"Wyder TK"'

1. GALEX UV Color-Magnitude Relations and Evidence for Recent Star Formation in Early-type Galaxies

Author

Yi, S, Yoon, SJ, Kaviraj, S, Deharveng, JM, Rich, RM, Salim, S, Boselli, A, Lee, YW, Ree, CH, Sohn, YJ, Rey, SC, Lee, JW, Rhee, J, Bianchi, L, Byun, YI, Donas, J, Friedman, PG, Heckman, TM, Jelinsky, P, Madore, BF, Malina, R, Martin, DC, Milliard, B, Morrissey, P, Neff, S, Schiminovich, D, Siegmund, O, Small, T, Szalay, AS, Jee, MJ, Kim, SW, Barlow, T, Forster, K, Welsh, B, and Wyder, TK

Subjects
Astrophysics
Abstract

We have used the GALEX UV photometric data to construct a first near-ultraviolet (NUV) color-magnitude relation (CMR) for the galaxies pre-classified as early-type by SDSS studies. The NUV CMR is a powerful tool for tracking the recent star formation history in early-type galaxies, owing to its high sensitivity to the presence of young stellar populations. Our NUV CMR for UV-weak galaxies shows a well-defined slope and thus will be useful for interpreting the restframe NUV data of distant galaxies and studying their star formation history. Compared to optical CMRs, the NUV CMR shows a substantially larger scatter, which we interpret as evidence of recent star formation activities. Roughly 15% of the recent epoch (z < 0.13) bright (M[r] < -22) early-type galaxies show a sign of recent (< 1Gyr) star formation at the 1-2% level (lower limit) in mass compared to the total stellar mass. This implies that low level residual star formation was common during the last few billion years even in bright early-type galaxies., Comment: This paper will be published as part of the Galaxy Evolution Explorer (GALEX) Astrophysical Journal Letters Special Issue. Links to the full set of papers will be available at http://www.galex.caltech.edu/PUBLICATIONS/ after November 22, 2004

Published
2004
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2. The WiggleZ Dark Energy Survey: probing the epoch of radiation domination using large-scale structure

Author

Poole, GB, Blake, C, Parkinson, D, Brough, S, Colless, M, Contreras, C, Couch, W, Croton, DJ, Croom, S, Davis, T, Drinkwater, MJ, Forster, K, Gilbank, D, Gladders, M, Glazebrook, K, Jelliffe, B, Jurek, RJ, Li, I-H, Madore, B, Martin, DC, Pimbblet, K, Pracy, M, Sharp, R, Wisnioski, E, Woods, D, Wyder, TK, Yee, HKC, Poole, GB, Blake, C, Parkinson, D, Brough, S, Colless, M, Contreras, C, Couch, W, Croton, DJ, Croom, S, Davis, T, Drinkwater, MJ, Forster, K, Gilbank, D, Gladders, M, Glazebrook, K, Jelliffe, B, Jurek, RJ, Li, I-H, Madore, B, Martin, DC, Pimbblet, K, Pracy, M, Sharp, R, Wisnioski, E, Woods, D, Wyder, TK, and Yee, HKC

Published
2013

3. The GALEX ultraviolet luminosity function of the cluster of galaxies A1367

Author

Cortese, L, Boselli, A, Gavazzi, G, Paramo, J, Madore, B, Barlow, T, Bianchi, L, Byun, Y, Donas, J, Forster, K, Friedman, P, Heckman, T, Jelinsky, P, Lee, Y, Malina, R, Martin, D, Milliard, B, Morrissey, P, Neff, S, Rich, R, Schiminovich, D, Siegmund, O, Small, T, Szalay, A, Treyer, M, Welsh, B, Wyder, T, Paramo, JI, Madore, BF, Byun, YI, Friedman, PG, Heckman, TM, Lee, YW, Martin, DC, Rich, RM, Szalay, AS, Treyer, MA, Wyder, TK, GAVAZZI, GIUSEPPE, Cortese, L, Boselli, A, Gavazzi, G, Paramo, J, Madore, B, Barlow, T, Bianchi, L, Byun, Y, Donas, J, Forster, K, Friedman, P, Heckman, T, Jelinsky, P, Lee, Y, Malina, R, Martin, D, Milliard, B, Morrissey, P, Neff, S, Rich, R, Schiminovich, D, Siegmund, O, Small, T, Szalay, A, Treyer, M, Welsh, B, Wyder, T, Paramo, JI, Madore, BF, Byun, YI, Friedman, PG, Heckman, TM, Lee, YW, Martin, DC, Rich, RM, Szalay, AS, Treyer, MA, Wyder, TK, and GAVAZZI, GIUSEPPE

Abstract

We present the Galaxy Evolution Exlorer (GALEX) near-ultraviolet (2310 angstrom) and far-ultraviolet ( 1530 angstrom) galaxy luminosity functions of the nearby cluster of galaxies A1367 in the magnitude range -20.3 <= M-AB <= -13.3. The luminosity functions are consistent with previous (similar to 2 mag shallower) estimates based on the FOCA and FAUST experiments, but they display a steeper faint-end slope than the GALEX luminosity function for local field galaxies. Using spectrophotometric optical data, we select star-forming systems from quiescent galaxies and study their separate contributions to the cluster luminosity function. We find that the UV luminosity function of cluster star-forming galaxies is consistent with the field. The difference between the cluster and field luminosity functions is entirely due to the contribution at low luminosities (M-AB > -16 mag) of non - star-forming, early-type galaxies that are significantly overdense in clusters.

Published
2005

4. Suppression of star formation in early-type galaxies by feedback from supermassive black holes.

Author

Schawinski K, Khochfar S, Kaviraj S, Yi SK, Boselli A, Barlow T, Conrow T, Forster K, Friedman PG, Martin DC, Morrissey P, Neff S, Schiminovich D, Seibert M, Small T, Wyder TK, Bianchi L, Donas J, Heckman T, Lee YW, Madore B, Milliard B, Rich RM, and Szalay A

Abstract

Detailed high-resolution observations of the innermost regions of nearby galaxies have revealed the presence of supermassive black holes. These black holes may interact with their host galaxies by means of 'feedback' in the form of energy and material jets; this feedback affects the evolution of the host and gives rise to observed relations between the black hole and the host. Here we report observations of the ultraviolet emissions of massive early-type galaxies. We derive an empirical relation for a critical black-hole mass (as a function of velocity dispersion) above which the outflows from these black holes suppress star formation in their hosts by heating and expelling all available cold gas. Supermassive black holes are negligible in mass compared to their hosts but nevertheless seem to play a critical role in the star formation history of galaxies.

Published
2006
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