ACS/grism spectra of 076

From: Vallery Stanishev (vall@physto.se)
Date: Tue May 11 2004 - 09:39:40 PDT

  • Next message: Vallery Stanishev: "Re: ACS/grism spectra of 076"

    Dear All,

    There are two plots attached to this message.
    One is with the spectra of the SN and the two nuclei of the host.
    On the other image is shown what is what (this is a deep image which
    Rachel did from the follow-up images).

    There are also possible matches. One of the host's nuclei is more
    consistent with a Sb galaxy at z~=1. The other looks like an elliptical
    at z~=1.7 (with the E tamplate from Andy's superfit) or z~=1.5 with
    NGC4889(E4) from the atlas of Kennicutt. However, the two nuclei are
    very close and contamination between them is possible. Also there is a
    faint source which happens to lie exactly along the dispersion, so its
    spectrum will overlap with those of the host galaxy's nuclei.

    As for the spectrum of the SN, it's heavily contaminated by the close
    galaxy. I would trust only the two humps at ~8000 and 8600 A. They could
    be matched with two humps seen at the max. spectrum of 1981B, if shifted
    to z=1.72.

    The observed Z-band mag of Ia at z=1 and z=1.6 should differ by
    something like 1.4 mag. Is it then possible that the SN is an Ic(b) at
    z=1, but being intrinsically fainter to look like Ia at hihger z?
      From the light curve it should be possible to exclude this possibility?

    Regards,
    Vallery 

    -- 
********************************************************
Dr. Vallery Stanishev
Stockholm University
AlbaNova University Center
FYSIKUM
106 91 Stockholm
SWEDEN

    tel: +46 8 55378731 fax: +46 8 55378601
vall@physto.se
vall_1@yahoo.com
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    im.jpg

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