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X-Unix-From: koekemoe@stsci.edu Thu Feb 13 16:24:49 2003
Date: Thu, 13 Feb 2003 16:24:24 -0500 (EST)
From: Anton Koekemoer
Subject: Minutes from GOODS/AGN telecon Thu 13 Feb
To: good.agn@zwolfkinder.jpl.nasa.gov
Cc: med@stsci.edu, mauro@stsci.edu
MIME-Version: 1.0
Content-MD5: H2Rdkq3n4TL81/+taxvhIQ==


Dear GOODS/AGN group,

here are the minutes from today's telecon:

Thu 13 Feb 2003, 11am EST / 8am Pacific / 5pm Europe

Present: Meg (Yale), Anton, Paolo P., Ray, Bahram, Norman, Dan (STScI),
Bob, Piero (ESO), Jacqueline (IAP), Stefano (Trieste), David Elbaz (Saclay),
Dave A., Franz, Niel, Ann (PSU), Ethan (AUI)

The main topic for discussion was to go through our plans for near-term
ApJ Letter papers. Piero presented a description of a new paper that he
would like to write with his student (Vincenzo Mainieri) that would
describe the properties of R>25 galaxies, using XMM and Chandra spectra
together with phot-z's and photometry from ground-based and ISAAC imaging,
and possibly now ACS, to determine whether these are Type 1 or 2. There was
some discussion about how this paper would relate to the paper already being
put together by Anton etal "The Properties of Optically Faint X-Ray Sources",
which is predominantly aimed at using the multi-colour ACS results to
investigate in detail the morphological nature of the host galaxies of
this population. There was general consensus that it should be possible
to find sufficiently distinct science for the papers to remain separate,
and Anton & Piero would continue discussing this further offline.

Next, Jacqueline summarized a paper that she would be interested in,
that could be described as "The Nature of Type 2 AGN", or "obscured AGN",
which would aim to investigate whether the population of obscured AGN
may contain subclasses of objects. Criteria for defining AGN as obscured
would include hardness ratio limits, and/or optical spectra that show no
signes of broad lines, and/or ACS imaging that show no signs of unresolved
nuclear point sources. People that expressed interest in this paper include
Paolo, Meg, Anton, Norman, Ethan, Bob, Dan.

Both the above papers (Piero's and Jacqueline's) will be added to the
GOODS/AGN website, with Piero's being tentatively identified as a
short-term ApJ letter paper as well.

Next, there was some discussion of the paper on "The Space Density of z>4 AGN",
and whether this could potentially be a short-term paper. Stefano Cristiani
has expressed an interest in leading this paper, which had been earlier
proposed by Dave Alexander. The basic question for this paper is how confident
are we that objects that we claim to be z>4 are not in fact at some much
lower redshift? A concern here is that, since the spectra are not yet being
shared, we may end up missing some of these objects that a more careful
examination may reveal to be at lower redshift. Nonetheless, it seemed
possible to do a first-cut paper based on photometric selection, for
example by correlating the B-band dropout list with the X-ray source list,
and derive some constraints (or upper limits) on AGN at z>4. An additional
concern, raised by Bahram, is that photo-z's for these objects may not be
reliable, although Stefano claims that the Lyman break helps to remove
degeneracies. This paper is tentatively added to the "short-term" paper list.

Discussion of the longer-term papers was deferred to a subsequent telecon.

Bob solicited input for the GOODS newsletter.

Paolo mentioned a paper that recently appeared on astro-ph, using GOODS data
to constrain the star-formation rate at z~6 using lyman break galaxies.


Action items from this telecon are:

* ALL: look at webpage:
http://www.stsci.edu/ftp/science/goods/Internal/Science/agn/
to see which papers you are currently listed as co-author on, and if there
is a paper that you are not listed for but feel that you may usefully
contribute (or feel strongly that you should be a part of), then contact
the lead author of that paper. Email addresses are all given in the
"email list" that is linked to from the top part of that page.

* Lead authors:
- begin to commmunicate with the co-authors if you have not
already done so, to determine what work needs to be done for a given
paper, who would contribute what, etc.
- By next telecon (Thu 20 Feb), be prepared to provide 5-min summary on
the status of the paper, along with a draft outline.

* Anton/Meg:
- send input to Bob for the GOODS newsletter
- update the webpage to include the new papers discussed.

* Dan: add new members (Meg's students) to GOODS/AGN group and circulate
email confirming this when it is done.


Next telecon will be:
Thu 20 Feb 2003, 11am EST / 8am Pacific / 5pm Europe


cheers,
- Anton & Meg.