Return-Path: dole@ias.fr Return-Path: Received: from pollux.ias.fr (daemon@pollux.ias.fr [192.93.157.44]) by srvr.ias.fr (8.7.5/8.7.3) with ESMTP id QAA01953; Thu, 21 Nov 1996 16:27:06 +0100 (FRSTD) Received: from pollux (localhost) by pollux.ias.fr with SMTP (1.39.111.2/16.2) id AA208229666; Thu, 21 Nov 1996 16:21:06 +0100 Sender: dole@ias.fr Message-Id: <32947361.7D79@ias.fr> Date: Thu, 21 Nov 1996 16:21:06 +0100 From: "Herve Dole a l'IAS, ORSAY" X-Mailer: Mozilla 3.0Gold (X11; I; HP-UX B.10.01 9000/715) Mime-Version: 1.0 To: rwest@eso.org Cc: dole@ias.fr, thi@ias.fr, audureau@ief-paris-sud.fr Subject: 2 proposals for observations AOL Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Dear Pr West, We submit you two proposals: 1- extragalactic jets 2- Jupiter atmosphere The two proposals are in this e-mail. Best Regards, Herve -- ------------------------------------------------------------------------------- Herve Dole | Phone: (33-1) 69.85.87.51 Institut d'Astrophysique Spatiale | or (33-1) 69.85.86.89 Bat 121, Universite Paris XI | Fax : (33-1) 69.85.86.75 91405 Orsay Cedex FRANCE | Web : http://www.ias.fr/~dole ------------------------------------------------------------------------------- ******************************************************************************* Program title: Extragalactic Jets _______________________________________________________________________________ Abstract: Extragalactic jets are very prowerful (probably the most in the universe) objects. They are clearly visible in radio wavelengths, but for some peculiar and famous of them, an optical counterpart is visible. The jets are supposed to be produced by extremely powerful central engines (black holes). It is very interesting to see a galaxy with a jet which is larger than the galaxy itself ! An image processing would allow us to see more clearly the jet. We propose to image three extragalactic jets, in B, R and I bands. The jets to image are 2C273, M84, and M87. (We've seen that m87 is already proposed in P5) _______________________________________________________________________________ Submitted by: Herve DOLE, Wing-Fai THI, Pascal AUDUREAU, and the association aphelie, France dole@ias.fr, thi@ias.fr, audureau@ief-paris-sud.fr http://www.ias.fr/~dole _______________________________________________________________________________ Position (epoch 2000.0) 3c273: alpha2000 = 12h29m06.8s delta2000 = +02d03'07.3'' M84: alpha2000 = 12h25m03.6s delta2000 = +12d53'14.6'' M87: alpha2000 = 12h30m49.6s delta2000 = +12d23'24.3'' _______________________________________________________________________________ Magnitude(blue) and redshifts: Object mb z 3c273: 13.10 0.158 M84: 10.00 3.41E-3 M87: 9.44 4.2E-3 (taken from LEDA data base) _______________________________________________________________________________ Exposures: I, R and B We have not a precise idea of the integration time in these bands... duration of exposures in minutes: I R B 3c273: 20 15 12 M84: 12 10 8 M87: 12 10 8 _______________________________________________________________________________ Rationale: Extragalactic jets are fascinating, because due to black holes. Moreover, it is not easy to see them at optical wavenlengths. The tree galaxies we propose are famous: 3c373 is the first quasar discovered, M84 and M87 have optical counterparts known since decades. The CCD sensibility and image processing allows us to image directly these jets. We saw in some books that the counterpart is visible in less than a few minutes of integration, so we think it is feasible. The broad band filters are adequat for 3c273 and his low redshift. We hope that the 13rd magnitude doesn't need long integration times. The filter R is choosen to image Hydrogen contribution; the I to image low-energetic contribution, we will maybe see a little part of the contribution of synchrotron emission; the B filter is used to image the galaxy, for an image processing. _______________________________________________________________________________ Comments: A field of view of 3'*3' is perfect. The I and R bands are very important for us. If there is a choice to do, because of clouds or no more time, please select firt I band, and R, and after B. _______________________________________________________________________________ Suggested Telescope and Instrument: 1- 80 cm, Wedelstein, Germany or 2- 80 cm, OHP, France (if available..) _______________________________________________________________________________ Place and date of Submission: Orsay, France, November 21, 1996 by Herve Dole for aphelie. ******************************************************************************** Programm Title: Jupiter Atmosphere _______________________________________________________________________________ Abstract: Jupiter is visible at the very beginning of the night, and the CCD imaging coupled to data processing alows to see and study the complex atmosphere of Jupiter. We propose to image Jupiter in a lot of spectral bands, in order to get the maximum of information. We can calculate the ratios Flux I/Flux R, etc.. _______________________________________________________________________________ Submitted by: Herve DOLE, Wing-Fai THI, Pascal AUDUREAU, and the association aphelie, France dole@ias.fr, thi@ias.fr, audureau@ief-paris-sud.fr http://www.ias.fr/~dole _______________________________________________________________________________ Position (epoch 2000.0) _______________________________________________________________________________ Magnitude: negative _______________________________________________________________________________ Exposures: Jupiter in I, R, V, B, U bands duration of exposures: ?? A few seconds ? _______________________________________________________________________________ Rationale: By imaging the atmosphere of Jupiter in 5 different bands, we can have important information, because each band see different levels and components. It is a pedagogical experiment to compare the 5 images. _______________________________________________________________________________ Comments: We need the lower possible field !! 1'*1' would be the best. _______________________________________________________________________________ Suggested Telescope and Instrument: 1- 80 cm, Wedelstein, Germany or La Silla if available or ... ? _______________________________________________________________________________ Place and date of Submission: Orsay, France, November 21, 1996 by Herve Dole for aphelie. *******************************************************************************