From: Chris Lidman (clidman@eso.org)
Date: Mon Jul 10 2006 - 07:55:19 PDT
Hi Tony,
I can make it for the 18th and 19th. The 11th and 12th are too
difficult for me.
Regards,
Chris.
On Jul 3, 2006, at 4:14 PM, Tony Spadafora wrote:
> HI all,
>
> Proposed dates for a teleconference are:
> Tues Jul 11
> Wed Jul 12
> Tues Jul 18
> Wed Jul 19
>
> Proposed start time is 10:00 PDT. With updates on progress from the
> cluster groups and discussion of new ideas, we might plan on 1.5-2
> hrs. Please let me know if you are available at these times (and if
> not, please suggest alternative times - preferably during the weeks
> of July 10 or July 17).
>
> Regards,
> -Tony
>
>
>
>
> On Jun 28, 2006, at 6:17 PM, Saul Perlmutter wrote:
>
>> ...One extra note to add to the status report: Tony will be trying
>> to set up a conference call in the next few weeks for discussion of
>> plans, so watch for email from ALSpadafora@lbl.gov
>>
>> --Saul
>>
>>
>> Kyle S Dawson wrote:
>>
>>> Hi All,
>>>
>>> I also feel that I have not done a good job updating everyone with
>>> the
>>> status of the SN search, so let me take this oppurtunity to do so.
>>> I'll
>>> start with a simple laundry list of what we've found, and then
>>> summarize
>>> our initial interpretations and some issues yet unresolved.
>>> There are now 25 clusters in the program. Three of these were added
>>> in
>>> Dec-Apr using free orbits from supernova-less clusters. All three of
>>> these new clusters come from archival XMM data. Observations are
>>> complete for 19 clusters. If I remember correctly, the search for
>>> SNe
>>> in 5 of the remaining 6 clusters will end in late July, and the last
>>> cluster search will end in late Aug. Those dates need to be double
>>> checked.
>>>
>>> The full cluster list, images of SNe, etc can be found on the TWiki:
>>> http://hstclustersn.lbl.gov:8081/twiki/bin/view/Supernovae/WebHome
>>> usrname: TWikiGuest
>>> passwd: hstclustersn
>>>
>>> Current status:
>>>
>>> Orbits used: 158 ACS, 21 NICMOS
>>> Remaining UNscheduled orbits: 7 ACS, 9 NICMOS
>>>
>>> ***BEGIN LAUNDRY LIST*******
>>>
>>> SNe discovered:
>>>
>>> Active:
>>> A-004: Awaiting spectroscopy using Subaru and VLT this week. Host
>>> is
>>> red, possible early type, but SN is too bright to be associated with
>>> z=1.4 cluster. SN color/mag, consistent with z~1.0-1.2.
>>>
>>> Cluster E hosts:
>>> O-000: z=1.01
>>> K-000: z=1.41???Waiting better spectroscopy, hopefully tonight
>>> H-005: z=1.23
>>>
>>> Other cluster SNe
>>> C-001: z=0.98, spectroscopically confirmed Ia, host faint and
>>> uncertain
>>>
>>> SNe hosted by E type galaxies with no emission lines in background of
>>> clusters:
>>> O-006: z=1.31
>>> C-000: z=1.09
>>> G-004: z=1.35
>>>
>>> low z field SNe (probably not useful for cosmology, maybe for rates)
>>> N-010: z=0.203, type unknown
>>> P-001: z=0.92, type unknown
>>> P-009: z=0.821, Ia
>>> X-027: z=0.4, type unknown (probably core collapse)
>>> C-007: host uncertain, type unknown
>>> G-003: z=0.963, type unknown
>>> F-008: host uncertain, type unknown
>>> H-003: z=0.851, Ia
>>> Z-005: z=0.624, Ia
>>>
>>> possible z>1.5 SNe (based on SNe color/mag, host color/mag):
>>> X-018: one epoch, faint red host
>>> X-026: two epochs, faint red host
>>> T-001: one epoch, faint red host
>>>
>>> undetermined redshift, discovered this week in reverse subtractions
>>> (last epoch as ref, first epoch as search). Three have faint hosts
>>> that
>>> appear spiral or irregular, with SNe and host consistent with z>1.
>>> We
>>> hope to find emission lines in spectroscopic observations next
>>> spring.
>>> E-012: faint host
>>> F-012: faint host, SNe color, lightcurve consistent with z>1 Ia
>>> K-018: possible cluster E, z=1.41, SN probably not useful for
>>> cosmology
>>> due to poorly sampled lightcurve, very good for rates, spectroscopy
>>> of
>>> host tonight, weather permitting
>>> L-021: faint host
>>>
>>> And finally, one mystery object:
>>> F-006: galactic, extragalactic, z=0.54, quasar, SNIc, hypernova, pop
>>> III SN, star??????? Nothing in the lightcurve or spectrum resembles
>>> anything this group has seen before. The transient is hostless to a
>>> limiting mag z'>26.5, i'>26.5. At max, the transient has z'=21.2 and
>>> i'=21.1.
>>> The lightcurve has a risetime of 100 days with no evolution in
>>> color. The spectrum has features semi-consistent with a SNIc at
>>> z=0.54, but
>>> lacks key Fe features. We posted an IAUC, or CBET as they are now
>>> called, and have an article written about it here:
>>> http://www.newscientistspace.com/article/dn9360-enigmatic-object-
>>> baffles-supernova-team.html
>>> We got more data on this in poor conditions Sunday night at Keck and
>>> last night at Subaru, there is clear continuum but the spectra are
>>> still
>>> waiting to be reduced.
>>>
>>> Unresolved issues: several SNe hosts have not been observed. We got
>>> murdered with Mauna Kea weather this spring and lost almost all of
>>> our
>>> time. We will try to pick up these redshifts in spring 2007.
>>>
>>> *******END LAUNDRY LIST************
>>>
>>> Now, as it stands we do have unscheduled orbits. If these orbits are
>>> still free in Aug, we plan to return to the 5 RCS clusters in the
>>> 02-04
>>> hr range for a second round of searching. We will have deep
>>> references
>>> from the 2005 data for the search, and have Keck DEIMOS time
>>> scheduled
>>> to coincide with these HST visits. We will use 5-10 orbits,
>>> depending
>>> on how many are free. If a SN is found, we will follow the
>>> lightcurve
>>> using the remaining unscheduled orbits. If no SN is found, we will
>>> preserve those last orbits to use as ToO for a SN search using time
>>> awarded to PRME et al in cycle 15 for observations of a new set of
>>> IRAC
>>> clusters.
>>>
>>> One thing that is very interesting to note is that we have a fairly
>>> high
>>> rate of SNe with z>1 E hosts, but a low rate of late type hosts at
>>> this
>>> redshift. This is very surprising and we do not have an answer for
>>> the
>>> low rate of late type hosts. In terms of cosmology, the z>1 E hosts
>>> should be extremely useful. The SN are often un-typed, but we plan
>>> to
>>> obtain deep spectroscopy of the hosts in order to place constraints
>>> on
>>> star forming and argue for Ia SNe. We believe these SNe should be
>>> dust-free as well, but this clearly needs to be explored. These SNe
>>> are
>>> also in the background of massive clusters, and are therefore
>>> subject to
>>> magnification via lensing. In order to use these for cosmology, we
>>> will
>>> need to remove this bias using estimates of cluster masses. We have
>>> two
>>> students working on this, and I'd like them to explore different
>>> techniques of measuring cluster mass. We may be asking for some help
>>> with that. For the purposes of cosmology, a 2\sigma measurement of
>>> mass
>>> through weak lensing is probably fine, but it will be very good for
>>> the
>>> two students to learn the other methods as well.
>>>
>>> And finally, we plan to perform a rates analysis. This is the best
>>> data
>>> set of high z cluster SNe, and the measurement of rates in the
>>> cluster
>>> environment should be a very good result. To do so, we will need to
>>> come to some consensus on how to define the cluster environment. The
>>> cluster sample is clearly inhomogeneous so this may require a bit of
>>> work. Something to think about for this telecon Marc Postman
>>> suggests.
>>>
>>> -Kyle
>>>
>>>
>>> ----- Original Message -----
>>> From: Marc Postman <postman@stsci.edu>
>>> Date: Wednesday, June 28, 2006 9:13 am
>>> Subject: Cluster science status
>>>
>>>
>>>> Saul, Mike, et al.,
>>>>
>>>> I am wondering if others feel as out of the loop as I on what's
>>>> happening with the cluster science part of the program and who is
>>>> doing what now. If I am not alone in this, it might be time for a
>>>> telecon to at least get an update on progress and discussion of
>>>> possible new ideas to pursue with the data.
>>>>
>>>> -Marc
>>>>
>>>> -----------------------------------------------------------------
>>>> Marc Postman Email: postman@stsci.edu
>>>> STScI - CMO Phone: +1-410-338-4340
>>>> 3700 San Martin Drive Fax: +1-410-338-4796
>>>> Baltimore, MD 21218 U.S.A. http://www.stsci.edu/~postman
>>>>
>>>>
>>>>
>>>>
>
>
>
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