From: Vallery Stanishev (vall@physto.se)
Date: Tue Apr 13 2004 - 06:35:47 PDT
Hi Vitaliy,
I looked at this and I don't think that the archive spectrum will be
useful for us. The archive spectrum is with exp. time of ~1600 sec only.
I think that the grism data we will have (some 28000 sec exp. time in
total) will be much more useful. Moreover, the so called high-resolution
mode gives ~24 A/px, which is not much higher than the low-res 40 A/px.
In addition, according to the ETC, for the same exp. time, the high-res.
mode will be twice less S/N than the low-res.
Cheers,
Vallery
Vitaliy Fadeyev wrote:
>
>
> Hi Rachel,
>
> you might be right. However, in Bahram's reply to Greg's question
> about the 076 host galaxy type he only discussed photo-z method
> based on ACS/near-IR (ground) image data. He never mentioned
> ACS grism spectra nor WFPC2 UV images. This makes me
> suspicios that he only used the familiar GOODs surveys data and
> did not actually account for anything else. This is not a reason
> to blame him of course. He did an excellent, urgent, and crucial job.
> My point is that *we* may want to know more about our precious
> candidate and its host.
>
> vitaliy
>
>
> "Rachel G." wrote:
>
>> Hi Vitaliy,
>>
>> Bahram already used all the information available to get
>> us this information.
>>
>> Rachel
>>
>> On Wed, 7 Apr 2004, Vitaliy Fadeyev wrote:
>>
>> >
>> >
>> > Dear All,
>> >
>> > I checked with the HST archive to see if they already
>> > have NICMOS observations in that region. (Just so that
>> > we could skip doing the final ref in case they are needed).
>> > Alas, there is no NICMOS. But there are some other observations
>> > in the candidate vicinity, listed below.
>> >
>> > The upshot is that there is one ACS/HRC grism, ACS HRC imaging
>> > in F555W and F892N, as well as WFPC2 F300W.
>> >
>> > I wander if these observations can help us with better determination
>> > of the redshift or the host galaxy properties.
>> >
>> > Cheers,
>> > vitaliy
>> >
>> >
>> > Target Name RA (J2000) Dec (J2000) Ref Start Time Exp Time
>> Instrument Apertures
>> > Filters/Gratings Proposal ID High-Level Science Products Ang Sep (')
>> > J8DNF4060 ANY 12 37 11.52 +62 22 07.2 16 2003-02-21 06:56:00
>> 1636.000 ACS HRC G800L;CLEAR2S 9583
>> > 0.283
>> > J8DNF4020 ANY 12 37 11.51 +62 22 07.1 16 2003-02-21 05:12:00
>> 748.000 ACS HRC F555W;CLEAR2S 9583
>> > 0.283
>> > J8DNF4040 ANY 12 37 11.51 +62 22 07.1 16 2003-02-21 05:33:00
>> 748.000 ACS HRC F892N;CLEAR2S 9583
>> > 0.283
>> > U8ITNK01M GOODS 12 37 14.76 +62 22 38.5 1 2002-11-25 02:28:00
>> 1000.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.730
>> > U8ITNK02M GOODS 12 37 14.78 +62 22 38.5 1 2002-11-25 02:54:00
>> 1000.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.732
>> > U8ITNB01M GOODS 12 37 15.11 +62 22 36.7 1 2002-11-22 21:30:00
>> 500.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.749
>> > U8ITNK03M GOODS 12 37 15.11 +62 22 36.7 1 2002-11-25 03:51:00
>> 1000.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.749
>> > U8ITNK04M GOODS 12 37 15.13 +62 22 36.7 1 2002-11-25 04:14:00
>> 1000.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.751
>> > U8ITNV01M GOODS 12 37 15.13 +62 22 36.7 1 2002-11-25 04:36:00
>> 700.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.751
>> > U8ITO701M GOODS 12 37 15.45 +62 22 34.8 1 2002-11-25 05:26:00
>> 700.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.771
>> > U8ITNR01M GOODS 12 37 15.47 +62 22 34.9 1 2002-11-25 05:49:00
>> 700.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.773
>> > U8ITNR02M GOODS 12 37 15.47 +62 22 34.9 1 2002-11-25 06:03:00
>> 1100.000 WFPC2 WFALL-FIX F300W 9481
>> > 0.773
>> >
>> >
>> >
>> >
>>
> --
> -------------------------------------------------
> Vitaliy Fadeyev
> SCP group at LBNL
> phone: 510-486-4169
> web: http://www-physics.lbl.gov/~fadeyev/
> -------------------------------------------------
>
>
-- ******************************************************** Dr. Vallery Stanishev Stockholm University AlbaNova University Center FYSIKUM 106 91 Stockholm SWEDENtel: +46 8 55378731 fax: +46 8 55378601 vall@physto.se vall_1@yahoo.com ********************************************************
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