Ó, gratula!

Beindult a dél-alföldi szupernóvagyár!

Snt

2012/1/25, FIDRICH Robert :
> Sziasztok!
>
> Vinkó Józsiék újabb szupernóvája. A felfedezéskor 15,5 magnitudó volt a
> fényessége. Kb egy héttel túl van már a maximumon, de azért nagyobb
> műszerekkel van esély lefényképezni...
>
> üdv:
>
> Fidusz
>
> * * *
>
> SUPERNOVA 2012O IN NGC 4906
>      W. Zheng, University of Michigan; J. Vinko, University of Szeged;
> G. H. Marion, Harvard-Smithsonian Center for Astrophysics; R. Quimby, IPMU,
> University of Tokyo; N. Whallon, A. Romadan, N. Wagner, and C. Akerlof,
> University of Michigan; F. Yuan, Australian National University; and J. C.
> Wheeler and E. Chatzopoulos, University of Texas, on behalf of the ROTSE
> collaboration, report the discovery of a new supernova (mag about 15.5) in
> unfiltered images taken on Jan. 18.33 UT with the 0.45-m ROTSE-IIIb
> telescope
> at McDonald Observatory.  The transient was observed again at mag about 15.6
> on Jan. 20.33, with no detection before Jan. 6 down to a limiting magnitude
> of about 18.0.  The new object is located at R.A. = 13h00m39s.99, Decl. =
> +27o55´24".4 (equinox 2000.0; uncertainty about 1"), which is 3".1 east and
> 1".8 south of the proposed host galaxy (NGC 4906, whose redshift is z =
> 0.0251; Rines et al. 2003, A.J. 126, 2152, via the SIMBAD website); a
> finding chart is posted at the following website URL:
> http://www.rotse.net/rsvp/j130040.0+275524/ROTSE3_J130040.0+275524.jpg
>      A spectrum, obtained on 2012 Jan. 21.37 UT with the 9.2-m Hobby-Eberly
> Telescope (+ Marcario Low-Resolution Spectrograph) by Matthew Shetrone,
> shows
> that 2012O is a typa-Ia supernova about a week past maximum.  Beside the
> characteristic Si II, S II, and Fe II features, the spectrum also contains
> many weak, narrow absorption features, probably due to the contamination by
> the host galaxy.  The SNID code (Blondin and Tonry 2007, Ap.J. 666, 1024)
> finds good matches with several normal type-Ia-supernova templates,
> including
> SN 2004L at six days and SN 2001fh at eight days after maximum.  The
> redshift
> estimated by SNID agrees with the value given in SIMBAD (see above) for NGC
> 4906.  The expansion velocity at the photosphere, inferred from the
> absorption
> minimum of the Si II 635.5-nm feature, is 9850 km/s.
>
> (CBET 2992)
>
> --
> Fidusz (FIDRICH Robert)
> drotlevel:fidusz@zpok.hu
> #jabber/gtalk: fidusz@jabber.hu
> #skype: fidusz
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