Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Golovich, N."'
Autor:
Pruett, K., Dawson, W., Medford, M. S., Lam, C., Lu, J. R., Perkins, S., McGill, P., Golovich, N., Chapline, G.
Primordial black holes (PBHs), theorized to have originated in the early universe, are speculated to be a viable form of dark matter. If they exist, they should be detectable through photometric and astrometric signals resulting from gravitational mi
Externí odkaz:
http://arxiv.org/abs/2211.06771
Autor:
Stuardi, C., Bonafede, A., Wittor, D., Vazza, F., Botteon, A., Locatelli, N., Dallacasa, D., Golovich, N., Hoeft, M., van Weeren, R. J., Brüggen, M., de Gasperin, F.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 3, November 2019, Pages 3905-3926
Radio relics are sites of electron (re)acceleration in merging galaxy clusters but the mechanism of acceleration and the topology of the magnetic field in and near relics are yet to be understood. We are carrying out an observational campaign on doub
Externí odkaz:
http://arxiv.org/abs/1908.11868
Autor:
Di Gennaro, G., van Weeren, R. J., Andrade-Santos, F., Akamatsu, H., Randall, S. W., Forman, W., Kraft, R. P., Brunetti, G., Dawson, W. A., Golovich, N., Jones, C.
We present the results from new deep {\it Chandra} ($\sim410$~ks) and {\it Suzaku} ($\sim180$ ks) observations of the merging galaxy cluster ZwCl\,0008.8+5215 ($z=0.104$). Previous radio observations revealed the presence of a double radio relic loca
Externí odkaz:
http://arxiv.org/abs/1902.00235
Autor:
Street, R. A., Lund, M. B., Donachie, M., Khakpash, S., Golovich, N., Penny, M., Bennett, D., Dawson, W. A., Pepper, J., Rabus, M., Szkody, P., Clarkson, W. I., Di Stefano, R., Rattenbury, N., Hundertmark, M. P. G., Tsapras, Y., Ridgway, S., Stassun, K., Bozza, V., Bhattacharya, A., Novati, S. Calchi, Shvartzvald, Y.
NASA's WFIRST mission will perform a wide-field, NIR survey of the Galactic Bulge to search for exoplanets via the microlensing techniques. As the mission is due to launch in the mid-2020s, around half-way through the LSST Main Survey, we have a uniq
Externí odkaz:
http://arxiv.org/abs/1812.04445
Autor:
Street, R. A., Lund, M. B., Khakpash, S., Donachie, M., Dawson, W. A., Golovich, N., Wyrzykowski, L., Szkody, P., Naylor, T., Penny, M., Rattenbury, N., Dall'Ora, M., Clarkson, W. I., Bennett, D., Pepper, J., Rabus, M., Hundertmark, M. P. G., Tsapras, Y., Di Stefano, R., Ridgway, S., Liu, M., Lin, E.
The overwhelming majority of objects visible to LSST lie within the Galactic Plane. Though many previous surveys have avoided this region for fear of stellar crowding, LSST's spatial resolution combined with its state-of-the-art Difference Image Anal
Externí odkaz:
http://arxiv.org/abs/1812.03137
Autor:
Di Gennaro, G., van Weeren, R. J., Hoeft, M., Kang, H., Ryu, D., Rudnick, L., Forman, W., Rottgering, H. J. A., Bruggen, M., Dawson, W. A., Golovich, N., Hoang, D. N., Intema, H. T., Jones, C., Kraft, R. P., Shimwell, T. W., Stroe, A.
Despite progress in understanding radio relics, there are still open questions regarding the underlying particle acceleration mechanisms. In this paper we present deep 1--4 GHz VLA observations of CIZA\,J2242.8+5301 ($z=0.1921$), a double radio relic
Externí odkaz:
http://arxiv.org/abs/1808.02447
Autor:
Hoang, D. N., Shimwell, T. W., van Weeren, R. J., Intema, H. T., Röttgering, H. J. A., Andrade-Santos, F., Akamatsu, H., Bonafede, A., Brunetti, G., Dawson, W. A., Golovich, N., Best, P. N., Botteon, A., Brüggen, M., Cassano, R., de Gasperin, F., Hoeft, M., Stroe, A., White, G. J.
We present LOFAR $120-168$ MHz images of the merging galaxy cluster Abell 1240 that hosts double radio relics. In combination with the GMRT $595-629$ MHz and VLA $2-4$ GHz data, we characterised the spectral and polarimetric properties of the radio e
Externí odkaz:
http://arxiv.org/abs/1804.11352
Autor:
Bonafede, A., Cassano, R., Brüggen, M., Ogrean, G. A., Riseley, C. J., Cuciti, V., de Gasperin, F., Golovich, N., Kale, R., Venturi, T., van Weeren, R. J, Wik, D. R., Wittman, D.
Pairs of radio relics are believed to form during cluster mergers, and are best observed when the merger occurs in the plane of the sky. Mergers can also produce radio halos, through complex processes likely linked to turbulent re-acceleration of cos
Externí odkaz:
http://arxiv.org/abs/1706.04203
Autor:
Ogrean, G. A., van Weeren, R. J., Jones, C., Forman, W., Dawson, W. A., Golovich, N., Andrade-Santos, F., Murray, S. S., Nulsen, P., Roediger, E., Zitrin, A., Bulbul, E., Kraft, R., Goulding, A., Umetsu, K., Mroczkowski, T., Bonafede, A., Randall, S., Sayers, J., Churazov, E., David, L., Merten, J., Donahue, M., Mason, B., Rosati, P., Vikhlinin, A., Ebeling, H.
The HST Frontier Fields cluster MACS J1149.6+2223 is one of the most complex merging clusters, believed to consist of four dark matter halos. We present results from deep (365 ks) Chandra observations of the cluster, which reveal the most distant col
Externí odkaz:
http://arxiv.org/abs/1603.06010
Autor:
de Gasperin, F., Intema, H. T., van Weeren, R. J., Dawson, W. A., Golovich, N., Wittman, D., Bonafede, A., Bruggen, M.
Diffuse radio emission in the form of radio halos and relics has been found in a number of merging galaxy clusters. These structures indicate that shock and turbulence associated with the merger accelerate electrons to relativistic energies. We repor
Externí odkaz:
http://arxiv.org/abs/1508.02901