Zobrazeno 1 - 10
of 147
pro vyhledávání: '"Graham, J. F."'
The number of long-duration Gamma Ray Burst (LGRB) host galaxies with measured metallicities and host masses has now grown to over one hundred, allowing us to investigate how the distributions of both these properties change with redshift. Using the
Externí odkaz:
http://arxiv.org/abs/1904.02673
Autor:
Greiner, J., Bolmer, J., Wieringa, M., van der Horst, A. J., Petry, D., Schulze, S., Knust, F., de Bruyn, G., Krühler, T., Wiseman, P., Klose, S., Delvaux, C., Graham, J. F., Kann, D. A., Moin, A., Nicuesa-Guelbenzu, A., Schady, P., Schmidl, S., Schweyer, T., Tanga, M., Tingay, S., van Eerten, H., Varela, K.
Publikováno v:
A&A 614, A29 (2018)
Deriving physical parameters from gamma-ray burst afterglow observations remains a challenge, even now, 20 years after the discovery of afterglows. The main reason for the lack of progress is that the peak of the synchrotron emission is in the sub-mm
Externí odkaz:
http://arxiv.org/abs/1802.01882
Autor:
Tanga, M., Krühler, T., Schady, P., Klose, S., Graham, J. F., Greiner, J., Kann, D. A., Nardini, M.
Publikováno v:
A&A 615, A136 (2018)
The collapsar model has proved highly successful in explaining the properties of long gamma-ray bursts (GRBs), with the most direct confirmation being the detection of a supernova (SN) coincident with the majority of nearby long GRBs. Within this mod
Externí odkaz:
http://arxiv.org/abs/1708.06270
Autor:
Knust, F., Greiner, J., van Eerten, H. J., Schady, P., Kann, D. A., Chen, T. -W., Delvaux, C., Graham, J. F., Klose, S., Krühler, T., McConnell, N. J., Guelbenzu, A. Nicuesa, Perley, D. A., Schmidl, S., Schweyer, T., Tanga, M., Varela, K.
Publikováno v:
A&A 607, A84 (2017)
Short-duration GRBs with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) due to their smaller luminosity. We present a multi-band data se
Externí odkaz:
http://arxiv.org/abs/1707.01329
Autor:
Kann, D. A., Schady, P., E., F. Olivares, Klose, S., Rossi, A., Perley, D. A., Zhang, B., Krühler, T., Greiner, J., Guelbenzu, A. Nicuesa, Elliott, J., Knust, F., Cano, Z., Filgas, R., Pian, E., Mazzali, P., Fynbo, J. P. U., Leloudas, G., Afonso, P. M. J., Delvaux, C., Graham, J. F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., Varela, K.
Publikováno v:
A&A 617, A122 (2018)
Afterglows of Gamma-Ray Bursts (GRBs) are simple in the most basic model, but can show many complex features. The ultra-long duration GRB 111209A, one of the longest GRBs ever detected, also has the best-monitored afterglow in this rare class of GRBs
Externí odkaz:
http://arxiv.org/abs/1706.00601
Autor:
Kann, D. A., Schady, P., Olivares, F. E., Klose, S., Rossi, A., Perley, D. A., Krühler, T., Greiner, J., Guelbenzu, A. Nicuesa, Elliott, J., Knust, F., Filgas, R., Pian, E., Mazzali, P., Fynbo, J. P. U., Leloudas, G., Afonso, P. M. J., Delvaux, C., Graham, J. F., Rau, A., Schmidl, S., Schulze, S., Tanga, M., Updike, A. C., Varela, K.
Publikováno v:
A&A 624, A143 (2019)
GRB 111209A, one of the longest Gamma-Ray Bursts (GRBs) ever observed, is linked to SN 2011kl, the most luminous GRB-Supernova (SN) detected so far, which shows evidence for being powered by a magnetar central engine. We place SN 2011kl into the cont
Externí odkaz:
http://arxiv.org/abs/1606.06791
Autor:
Graham, J. F., Schady, P.
We estimate the LGRB progenitor rate using our recent work on the effects of environmental metallically on LGRB formation in concert with SNe statistics via an approach patterned loosely off the Drake equation. Beginning with the cosmic star-formatio
Externí odkaz:
http://arxiv.org/abs/1511.01466
Autor:
Graham, J. F., Fruchter, A. S.
There is now strong evidence that Long-duration Gamma-Ray Bursts (LGRBs) are preferentially formed in low-metallicity environments. However, the magnitude of this effect, and its functional dependence on metallicity have not been well characterized.
Externí odkaz:
http://arxiv.org/abs/1511.01079
Autor:
Graham, J. F., Fruchter, A. S., Levesque, E. M., Kewley, L. J., Tanvir, N. R., Levan, A. J., Patel, S. K., Misra, K., Huang, K. -H., Reichart, D. E., Nysewander, M., Schady, P.
We present our imaging and spectroscopic observations of the host galaxies of two dark long bursts with anomalously high metallicities, LGRB 051022 and LGRB 020819B, which in conjunction with another LGRB event with an optical afterglow comprise the
Externí odkaz:
http://arxiv.org/abs/1511.00667
Autor:
Krühler, T., Malesani, D., Fynbo, J. P. U., Hartoog, O. E., Hjorth, J., Jakobsson, P., Perley, D. A., Rossi, A., Schady, P., Schulze, S., Tanvir, N. R., Vergani, S. D., Wiersema, K., Afonso, P. M. J., Bolmer, J., Cano, Z., Covino, S., D'Elia, V., Postigo, A. de Ugarte, Filgas, R., Friis, M., Graham, J. F., Greiner, J., Goldoni, P., Gomboc, A., Hammer, F., Japelj, J., Kann, D. A., Kaper, L., Klose, S., Levan, A. J., Leloudas, G., Milvang-Jensen, B., Guelbenzu, A. Nicuesa, Palazzi, E., Pian, E., Piranomonte, S., Sanchez-Ramirez, R., Savaglio, S., Selsing, J., Tagliaferri, G., Vreeswijk, P. M., Watson, D. J., Xu, D.
Publikováno v:
A&A 581, A125 (2015)
[Abridged] We present data and initial results from VLT/X-Shooter emission-line spectroscopy of 96 GRB-selected galaxies at 0.1
Externí odkaz:
http://arxiv.org/abs/1505.06743