Reportes, informes y documentos de trabajo
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Browsing Reportes, informes y documentos de trabajo by Author "Berlind, P."
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- ItemSupernova 2011cg(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Marion, G. H.; Berlind, P.Report the Catalina Real-time Transient Survey's discovery of an apparent supernova in unfiltered Catalina Sky Survey images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011cg Apr. 14.33 14 59 09.25 + 7 18 04.2 15.7 2" W, 1" S G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of 2011cg was obtained on May 5 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011cg is a type-Ia supernova about two weeks after maximum light....
- ItemSupernova 2011D in UGC 2498(2011) Narla, A.; Cenko, S. B.; Li, W.; Filippenko, A. V.; Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Marion, G. H.; Challis, P.; Berlind, P.Via public images from the Catalina Sky Survey (CSS). 2011 UT R.A. (2000.0) Decl. Mag. Offset Observers Jan. 5.09 3 02 14.58 +17 20 58.9 18.2 33".8 E, 14".7 N CSS Jan. 6.30 3 02 14.53 +17 20 58.3 18.2 34".4 E, 14".8 N KAIT Additional magnitudes for 2011D: 2010 Dec. 8.32 UT, [19.3 (KAIT); 10.19, [19.4 (CSS); 2011 Jan. 7.21, 18.2 (KAIT); 8.13, 17.8 (S. Howerton, remotely with the LB-1 0.6-m telescope near Rodeo, NM, U.S.A.). Drake notes that the presumed host galaxy, UGC 2498, has redshift z = 0.0231. G. H. Marion and P. Challis, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) was obtained of 2011D on Jan. 8 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011D is a type-IIb supernova a few days before maximum light....
- ItemSupernova 2011hc = Psn J20121007-1121577(2011) Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; Beshore, E. C.; Larson, S. M.; Christensen, E.; Koff, R. A.; Marion, G. H.; Berlind, P.Report the discovery of an apparent supernova in unfiltered Catalina Sky Survey (CSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011hc Oct. 23.16 20 12 10.07 -11 21 57.7 16.5 0".8 N The variable was designated PSN J20121007-1121577 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011hc based on the spectroscopic confirmation reported below. Additional CCD magnitudes (unfiltered unless otherwise noted) for 2011hc: 2010 Nov. 18.10 UT, [19.0 (CSS); 2011 Oct. 26.177, 16.4 (Joseph Brimacombe, Cairns, Australia; position end figures 10s.11, 56".6; image posted at the following website URL: http://www.flickr.com/photos/43846774@N02/6290844088/); 29.06, 16.5 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain reflector + Apogee AP-47p CCD camera; position end figures 10s.06, 57".1; UCAC3 reference stars; image scale 2"/pixel; limiting magnitude 18.4); 29.898, R = 16.7 (Federica Luppi, Varese, Italy, 0.36-m f/7.9 reflector + Bessell R filter; position end figures 10s.10, 56".4; reference stars from CMC-14 catalogue; image posted at http://www.astrogeo.va.it/pub/TOCP/PSN_20121007-1121577.jpg). G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm) of PSN J20121007-1121577 = 2011hc was obtained on Oct. 28 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross- correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011hc is a type-Ia supernova near maximum light. A good fit is found for the template from the normal type-Ia supernova 2006S at +1 day. Good fits can also be found for 1991T-like type-Ia supernovae at a similar epoch. The velocity of the Si II 635.5-nm feature is estimated to be approximately 8000 km/s, using an estimated redshift of z = 0.0310, measured from host- galaxy emission lines....
- ItemSupernova 2011ho in NGC 3847 = Psn J11441295+3330581(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; McNaught, R. H.; Garradd, G.; Beshore, E. C.; Larson, S. M.; Christensen, E.; Foley, R. J.; Kasen, D.; Filippenko, A. V.; Marion, G. H.; Berlind, P.Report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011ho Oct. 28.49 11 44 12.95 +33 30 58.1 18.7 12".8 W, 5".8 N This variable was designated PSN J11441295+3330581 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011ho based on the spectroscopic confirmation reported below. Further unfiltered CCD magnitudes for 2011ho: June 11.21 UT, [19.0 (CSS); Oct. 30.495, 18.3 (Joseph Brimacombe, Cairns, Australia; position end figures 13s.10, 59".2; image posted at website URL http://www.flickr.com/photos/43846774@N02/6297040020/). R. J. Foley, Harvard-Smithsonian Center for Astrophysics; and D. Kasen and A. V. Filippenko, University of California, Berkeley, report that a CCD spectrum (range 310-1020 nm), obtained on Oct. 31 UT with the Keck I 10-m telescope (+ LRIS), shows that PSN J11441295+3330581 = SN 2011ho is a type-Ia supernova near maximum brightness. The spectrum exhibits a large Si II 597.2-nm/635.5-nm ratio, indicating a cooler photosphere and a lower luminosity. The spectrum is similar to that of SN 1986G at -3 days (Phillips et al. 1987, PASP 99, 592), but it also resembles spectra of the more typical type-Ia supernovae 1992A and 2004eo at a similar epoch. After removing the recession velocity of 9520 km/s (obtained from the Sloan Digital Sky Survey), the minimum of the Si II 635.5-nm feature is blueshifted by 11700 km/s. G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm) of PSN J11441295+3330581 = 2011ho was obtained on Nov. 3 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011ho is a 1991bg-like type-Ia supernova near maximum light. Good fits can be found to several templates of normal and 1991bg-like type-Ia supernovae within three days of maximum. The presence of a strong feature from Si II 597.2-nm and the reported brightness of 2011ho are consistent with a subluminous, or 1991bg-like, type-Ia supernova. Using an estimated redshift of z = 0.031829 for NGC 3847 as reported in NED (de Vaucouleurs et al. 1991, RC3.9C), the velocity of the Si II 635.5-nm and 597.2-nm features are estimated to be 10700 km/s and 10500 km/s, respectively....
- ItemSupernova 2011ik in UGC 1871 = Psn J02250409+2212519(2011) Howerton, S.; Drake, A. J.; Djorgovski, S. G.; Mahabal, A.; Graham, M. J.; Williams, R.; Prieto, J. L.; Catelan, Marcio; McNaught, R. H.; Garradd, G.; Beshore, E. C.; Larson, S. M.; Christensen, E.; Koff, R. A.; Marion, G. H.; Berlind, P.Report the discovery of an apparent supernova in public images from the Mount Lemmon Survey: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011ik Nov. 24.20 2 25 04.09 +22 12 51.9 17.9 7".1 W, 9".3 S The variable was designated PSN J02250409+2212519 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011ik based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2011ik: Nov. 26.292 UT, 18.7 (Joseph Brimacombe, Cairns, Australia; observed remotely using a 51-cm RCOS telescope + STL11K camera + luminance filter at the New Mexico Skies Observatory near Mayhill, New Mexico; position end figures 04s.19, 53".6; image posted at the following website URL: http://www.flickr.com/photos/43846774@N02/6411553661/); 27.350, 17.2 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + unfiltered Apogee AP-47p camera; limiting magnitude 18.7; marginal detection in galaxy glow; position end figures 04s.06, 53".0; UCAC3 reference stars). G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, reports that a spectrum (range 340-740 nm) of PSN J02250409+2212519 = 2011ik was obtained on Nov. 26 UT by P. Berlind with the F. L. Whipple Observatory 1.5-m telescope (+ FAST). Cross- correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2011ik is a type-Ia supernova more than two weeks after maximum light. A good fit is found to the template of the normal type-Ia supernova 2003cg at +24 days....