From: Saul Perlmutter (saul@lbl.gov)
Date: Wed Mar 19 2003 - 07:41:28 PST
Hi Mamoru, I'm trying to figure out what other complaints we will hear from
Dan Greene when we try to send this telegram in to the IAU. He might complain
about the 3 supernovae in the first set that have no supernova type given. For
those 3 supernovae, do we have a lightcurve that is very clearly a supernova
(perhaps with a magnitude consistent with a Type Ia at that redshift)? Or do
we have a spectrum that shows the broad wiggles of a supernova, but just not
enough information to say Type I or II? If the answer to either of these
questions is yes, then we should add a sentence to make this point.
Also, in previous IAU telegrams we often had supernovae that we called
generally Type I (as opposed to specifically Type Ia), when we didn't have as
much confidence that they weren't Type Ib or Ic. Shouldn't a number of these
supernovae be in that category? And, finally, is it a surprise that we have
zero supernovae that we consider likely to be Type II?
I think if we can clear up these last points, then we're probably in pretty
good shape with the telegram and Dan Greene at the IAU may not give us to0 much
trouble (well, he always complains about something). We will probably have to
suggest a way that we prefer to break this telegram up in to the several smaller
telegrams that he likes to send.
Talk to you later. Regards, --Saul
Mamoru Doi wrote:
> Dear Tony, Arial, Greg, Saul, and all,
>
> I revised the SCP names. I also fixed the number of the SNe
> in the first paragraph (29->30). Also we just write
> "30 supernovae", not "possible 30 supernovae" following
> Saul's suggestion.
>
> I also change type of SuF02-065 from Ia to Ia?, since light curve
> is quite flat as an SNIa.
>
> >In the draft IAUC I didn't see mention of our probable SN at z ~ 1.3/1.5
> >--- shouldn't we say something about it? Do we have enough of a
> >lightcurve to say whether it is consistent with a SN? It seems that the
> >spectrum is consistent with that of a SN of some type --- I think we're
> >just debating what type should be assigned.
>
> Greg, at the last video meeting, I thought, we agreed that we will discuss
> (at least) 081 and 012 (z~1.3/1.5) in a paper, and won't mention about
> redshift. So I put them to the 2nd category (no redshift and no type).
> But it is true that the 2nd category is not homogeneous, since we have
> spectrum information for some of them.
>
> The problem is that if we add information to some of those
> in the 2nd category, the rest may be regarded as not convincing as SNe.
>
> Maybe we can move 012 back to the first category.
> SuF02-012 Nov. 3.3 02:18:51.59 -04:47:24.8 25.1 1.3/1.5 Ia? 0.2" N
> This is, of course, more impressive. High-Z team reported a SN at z=1.3
> (no type) a while ago.
>
> It depends on how confident we are in the redshift (1.3 or 1.5) for 012.
> Do you think we can move?
>
> I would like to discuss about this at the meeting soon.
>
> Anyway the draft version 4 is attached below.
>
> Cheers,
>
> -Mamoru
>
> Ver.4
> ---------------------------------------------------------------------
> M. Doi, Univ. of Tokyo, on behalf of the Supernova Cosmology
> Project(cf. IAUC 7971, plus B. Lee, R. Vogel and V. Stanishev) and
> the Subaru high-redshift supernova search group (N. Yasuda,
> N. Kashikawa, K. Motohara, T. Morokuma, K.Sekiguchi, G. Kosugi,
> H. Furusawa, Y. Komiyama, T. Takata, M. Ouchi, Y. Ohyama, and
> Subaru Observatory SXDS Project members), reports the discovery of
> 30 supernovae found with Subaru telescope +prime-focus Suprime-Cam
> in SDSS i' band. Reference images were taken on Sep. 30 and Oct.1,
> 2002. The limiting magnitude of reference images was about 26.6mag
> (S/N=5 for 2arcsec aperture). We took search images on Nov. 3.
> The magnitude increase of the SNe compared with the images in the
> reference are given in the table below (photometric accuracy 0.1-0.2mag).
>
> Follow-up photometry was carried out with Suprime-Cam, and we
> confirmed SN signals at least 3 epochs among 7
> (Nov.3,6,10,28,30,Dec.7,8) for 30 SNe below.
>
> The supernova spectra were obtained with GMOS on Gemini-N on
> Nov. 6, 8, and 9; with ESI on KeckII on Nov. 6, 7, 9,
> and 10; with FORS2 on Yepun (VLT-UT4) on Nov. 7 - 11; and
> with FOCAS on Subaru on Nov. 12. Redshifts were obtained for 19
> SNe using either the host galaxy spectrum or with template spectrum
> fitting of SN.
>
> SCPname 2002 UT R.A. (J2000) Decl. i' z type host info.
> SuF02-065 Nov. 3.3 02:17:34.53 -05:00:15.4 25.2 1.181 Ia? 1.3" SSE
> SuF02-060 Nov. 3.3 02:17:34.51 -04:53:46.6 24.5 1.063 Ia 0.0"
> SuF02-007 Nov. 3.3 02:18:52.36 -05:01:13.2 24.8 1.18? Ia no host
> SuF02-061 Nov. 3.3 02:17:22.73 -05:16:56.1 24.7 1.08? ? 0.0"
> SuF02-017 Nov. 3.3 02:16:45.71 -05:09:51.2 25.0 1.03 Ia no host
> SuF02-071 Nov. 3.3 02:17:08.63 -05:02:06.4 23.8 0.928 Ia 1.4" E
> SuF02-037 Nov. 3.3 02:17:43.30 -04:30:56.7 24.6 0.926 Ia 0.4" E
> SuF02-000 Nov. 3.3 02:17:42.54 -05:06:34.0 24.8 0.92 Ia? 0.5" NE
> SuF02-005 Nov. 3.3 02:18:35.70 -04:31:11.0 24.6 0.863 ? 0.3" NE
> SuF02-002 Nov. 3.3 02:17:12.24 -04:55:08.7 24.4 0.823 Ia? 0.3" NW
> SuF02-021 Nov. 3.3 02:18:10.56 -04:40:20.6 24.6 0.69 Ia? 2.9" SSW
> SuF02-055 Nov. 3.3 02:18:53.20 -04:32:59.2 23.7 0.66 Ia 0.6" N
> SuF02-082 Nov. 3.3 02:18:40.73 -05:03:44.3 25.3 0.623 Ia? 1.1" NNW
> SuF02-025 Nov. 3.3 02:16:23.93 -04:49:29.4 24.5 0.606 Ia 0.2" W
> SuF02-077 Nov. 3.3 02:18:35.15 -04:26:38.9 25.1 0.59 Ia? 0.6" NW
> SuF02-001 Nov. 3.3 02:17:00.05 -04:58:19.6 23.4 0.57 Ia 0.5" W
> SuF02-019 Nov. 3.3 02:17:38.08 -05:08:46.8 24.5 0.505 Ia? 0.3" NW
> SuF02-028 Nov. 3.3 02:16:56.37 -05:00:57.4 24.9 0.347? ? 1.5" SE
> SuF02-059 Nov. 3.3 02:20:28.06 -04:58:50.3 25.7 0.269 Ia? 0.2" E
>
> SCPname 2002 UT R.A. (J2000) Decl. i' host info.
> SuF02-081 Nov. 3.3 02:20:07.55 -05:08:27.2 25.1 0.0"
> SuF02-012 Nov. 3.3 02:18:51.59 -04:47:24.8 25.1 0.2" N
> SuF02-083 Nov. 3.3 02:18:06.22 -05:00:38.1 26.0 0.4" S
> SuF02-034 Nov. 3.3 02:18:31.21 -05:01:24.4 25.6 0.2" N
> SuF02-004 Nov. 3.3 02:18:09.01 -04:54:17.9 25.1 0.6" SE
> SuF02-086 Nov. 3.3 02:17:16.18 -05:06:02.7 26.2 no host
> SuF02-076 Nov. 3.3 02:16:26.37 -05:04:32.5 26.1 no host
> SuF02-J01 Nov. 3.3 02:17:45.97 -04:36:46.2 25.2 0.2" W
> SuF02-051 Nov. 3.3 02:17:27.48 -04:40:45.2 25.4 no host
> SuF02-057 Nov. 3.3 02:20:13.92 -05:07:36.0 25.6 no host
> SuF02-056 Nov. 3.3 02:20:00.03 -04:44:20.2 24.3 0.5" SE
>
> Mamoru Doi
> Institute of Astronomy
> School of Science
> University of Tokyo
> voice +81-422-34-5084
> fax. +81-422-34-5041
> doi@ioa.s.u-tokyo.ac.jp
This archive was generated by hypermail 2.1.4 : Wed Mar 19 2003 - 07:39:23 PST