Zobrazeno 1 - 10
of 669
pro vyhledávání: '"Hummel W"'
The X-ray source CXO\, J085201.4$-$461753in the few kyr-old Vela Jr. supernova remnant (G266.2-1.2) belongs to the peculiar class of isolated neutron stars dubbed "Central Compact Objects" (CCOs). At variance with the other CCOs, which are only detec
Externí odkaz:
http://arxiv.org/abs/1904.12035
Autor:
Esposito, P., De Luca, A., Turolla, R., Zelati, F. Coti, Hummel, W., Tiengo, A., Israel, G. L., Rea, N., Mignani, R. P., Borghese, A.
Publikováno v:
A&A 626, A19 (2019)
We observed the slowly revolving pulsar 1E 161348-5055 (1E 1613, spin period of 6.67 h) in the supernova remnant RCW 103 twice with XMM-Newton and once with the Very Large Telescope (VLT). The VLT observation was performed on 2016 June 30, about a we
Externí odkaz:
http://arxiv.org/abs/1904.05424
Autor:
Shokry, A., Rivinius, Th., Mehner, A., Martayan, C., Hummel, W., Townsend, R. H. D., Mérand, A., Mota, B., Faes, D. M., Hamdy, M. A., Beheary, M. M., Gadallah, K. A. K, Abo-Elazm, M. S.
Publikováno v:
A&A 609, A108 (2018)
Aims. The X-shooter archive of several thousand telluric star spectra was skimmed for Be and Be-shell stars to derive the stellar fundamental parameters and statistical properties, in particular for the less investigated late type Be stars, and the e
Externí odkaz:
http://arxiv.org/abs/1711.02619
We present deep observations of the field of the magnetar CXOJ164710.2-455216 in the star cluster Westerlund 1, obtained in the near-infrared with the adaptive optics camera NACO@VLT. We detected a possible candidate counterpart at the {\em Chandra}
Externí odkaz:
http://arxiv.org/abs/1708.02233
Autor:
MignanI, R. P., De Luca, A., Hummel, W., Zajczyk, A., Rudak, B., Kanbach, G., Slowikowska, A.
The ~1700 year old PSR B0540-69 in the LMC is considered the twin of the Crab pulsar because of its similar spin parameters, magnetic field, and energetics. Its optical spectrum is fit by a power-law, ascribed to synchrotron radiation, like for the y
Externí odkaz:
http://arxiv.org/abs/1204.6655
Autor:
De Luca, A., Marelli, M., Mignani, R. P., Caraveo, P. A., Hummel, W., Collins, S., Shearer, A., Parkinson, P. M. Saz, Belfiore, A., Bignami, G. F.
The Large Area Telescope (LAT) onboard the Fermi satellite opened a new era for pulsar astronomy, detecting gamma-ray pulsations from more than 60 pulsars, ~40% of which are not seen at radio wavelengths. One of the most interesting sources discovere
Externí odkaz:
http://arxiv.org/abs/1102.3278
Autor:
De Luca, A., Mignani, R. P., Sartori, A., Hummel, W., Caraveo, P. A., Mereghetti, S., Bignami, G. F.
1E 1207.4-5209, the peculiar Central Compact object in the G296.5+10.0 supernova remnant, has been proposed to be an "anti-magnetar" - a young neutron star born with a weak dipole field. Accretion, possibly of supernova fallback material, has also be
Externí odkaz:
http://arxiv.org/abs/1007.3623
Autor:
Israel, G. L., Rea, N., Mangano, V., Testa, V., Perna, R., Hummel, W., Mignani, R., Ageorges, N., Curto, G. Lo, Marco, O., Angelini, L., Campana, S., Covino, S., Marconi, G., Mereghetti, S., Stella, L.
Publikováno v:
Astrophys.J. 603 (2004) L97-L100
We report the accurate sub-arcsec X-ray position of the new Anomalous X-ray Pulsar (AXP) XTE J1810-197, derived with a Chndra-HRC Target of Opportunity observation carried out in November 2003. We also report the discovery of a likely IR counterpart
Externí odkaz:
http://arxiv.org/abs/astro-ph/0401334
Autor:
Israel, G. L., Covino, S., Stella, L., Mauche, C. W., Campana, S., Marconi, G., Hummel, W., Mereghetti, S., Munari, U., Negueruela, I.
Publikováno v:
Astrophys.J.598:492-500,2003
We report on the first near-simultaneous X-ray and optical observations of RX J0806.3+1527. The source is believed to be a 321s orbital period ultra-compact binary system hosting an X-ray emitting white dwarf. Data were obtained with Chandra and the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308045
Autor:
Israel, G. L., Hummel, W., Covino, S., Campana, S., Appenzeller, I., Gassler, W., Mantel, K. -H., Marconi, G., Mauche, C. W., Munari, U., Negueruela, I., Nicklas, H., Rupprecht, G., Smart, R. L., Stahl, O., Stella, L.
We carried out optical observations of the field of the X-ray pulsator RXJ0806.3+1527. A blue V=21.1 star was found to be the only object consistent with the X-ray position. VLT FORS spectra revealed a blue continuum with no intrinsic absorption line
Externí odkaz:
http://arxiv.org/abs/astro-ph/0203043