AVO 2003 Nov 17-18A T N F @ A S C1. AVO 2003 Nov 17-18A T N F @ A S C2 NB: in the presentation,...
-
Upload
hannah-pereira -
Category
Documents
-
view
213 -
download
0
Transcript of AVO 2003 Nov 17-18A T N F @ A S C1. AVO 2003 Nov 17-18A T N F @ A S C2 NB: in the presentation,...
AVO 2003 Nov 17-18 A T N F @ A S C 1
A Search for new Active Stars in the Galaxy via VOs CATS & USNO N. Kardashev Astro Space Centre, Moscow, Russia O. B. Slee ATNF, Sydney, Australia M. Rupen National Radio Oservatory, Soccoro, USA R. Stathakis Anglo-Australian Observatory, Sydney, Australia E. Barsukova Special Astrophysical Observatory, N. Arkhyz, Russia V. Goransky Sternberg Astronomical Institute, Moscow, Russia J. Pacheco Observatory d’Cote Azur, Nice, France D. Gabuzda Cork University College, Ireland R. Ojha ATNF, Sydney, Australia I. Chandra GMRT, Bangalor, India E. Budding Carter Observatory, New Zealand G. Tsarevsky ATNF, Sydney, Australia & Astro Space Centre, Moscow, Russia
Aus-VO WORKSHOP2003
AVO 2003 Nov 17-18 A T N F @ A S C 2
NB: in the presentation, those slides describing virtual
observations in the project have a light blue background like
this one -
AVO 2003 Nov 17-18 A T N F @ A S C 3
NB: Those slides dedicated to real observations are just white
like this one.
AVO 2003 Nov 17-18 A T N F @ A S C 4
Microquasar - by definition, - it is an X-ray binary (XRB) which exhibits radio jets, sometimes with relativistic speed.
AVO 2003 Nov 17-18 A T N F @ A S C 5
Project Description :
= astro-ph/0110511
In: The Physics of Cataclysmic Variables and Related Objects, ASP Conf. Ser., v. 261, eds. B. Gänsicke et al., p. 301, 2002and In: New Directions for Close Binary Studies: “The Royal Road to the Stars”, Publ. of Canakkale University Astrophysics Research Center, vol. 3, p. 246, 2003
AVO 2003 Nov 17-18 A T N F @ A S C 6
AVO 2003 Nov 17-18 A T N F @ A S C 7
AVO 2003 Nov 17-18 A T N F @ A S C 8
Project’s flow chart: Stage I – selection of the ROSAT
hard spectrum sources [VO].
Stage II – tentative radio IDs [VO]. Stage III – high resolution radio
observations.
Stage IV – optical IDs [VO]; . galaxies to be discarded.
Stage V – optical spectroscopy.
AVO 2003 Nov 17-18 A T N F @ A S C 9
Stage I – selection in X-ray from the Bright ROSAT Sources Catalogue
(1RXS)
[ W. Voges et al., A&A 349, 389, 1999 ] The main selection criterium = = Motch’s Strip : 0.90 ≤ HR1 ≤ 1.00 0.25 ≤ HR2 ≤ 1.00 [ C. Motch et al., A&A 132, 341, 1998 ] AND Sources in the Galactic Plane:
|b| < 200
AVO 2003 Nov 17-18 A T N F @ A S C 10
Stage II – tentative identifications in Radio Surveys:
• NVSS (VLA, D-configuration) 1.4 GHz
• 87GB/GB6/PMN (single dish) 4.8 GHz -----&---- radio variability checking
[GB6] = { [1987GB]2 + [1989GB]2 } -2
(J. J. Condon, Private comm.)
AVO 2003 Nov 17-18 A T N F @ A S C 11
Stage II:
The X-ray-Radio cross-identifications have been made using CATS : a major collection of databases gathered and maintained by S. Trushkin et al. of the Special Astrophysical Observatory
http://cats.sao.ru
AVO 2003 Nov 17-18 A T N F @ A S C 12
SIMBAD :- no GB6
- no NVSS - no 2MASS
AVO 2003 Nov 17-18 A T N F @ A S C 13
N E D : no multi-source query on the web;
no 2MASS (only 2MASX)
AVO 2003 Nov 17-18 A T N F @ A S C 14
C A T S : ► A complete collection of
radio catalogs (191).► Multi-source query.
► 2MASS & USNO Catalogs
(not Charts/Images). ► VOTable format – to be
implemented soon. http://cats.sao.ru
AVO 2003 Nov 17-18 A T N F @ A S C 15
C A T S :
SUMSS is already there(with a multiple position query,
of course).
http://cats.sao.ru
AVO 2003 Nov 17-18 A T N F @ A S C 16
Stage III: Targeted radio observations
(with a sub-arcsec coordinate precision):
• VLA
A-configuration, 1.4 & 4.8 GHz • ATCA
6-km configuration, 4.8 & 8.6 GHz
AVO 2003 Nov 17-18 A T N F @ A S C 17
Stage IV:
Radio-Optical Identifications by the Digital Sky Surveys (DSS)
[obvious galaxies were discarded]
AVO 2003 Nov 17-18 A T N F @ A S C 18
The best DSS access among many others is …
AVO 2003 Nov 17-18 A T N F @ A S C 19
A Virtual Observatory of the US Naval Observatory,
Flagstaff Station, Arizona:
USNO PMMhttp://www.nofs.navy.mil/projects/pmm/
Observables: coordinates; charts; images; B, R, I magnitudes at two epochs,
(hence variability) ; image analysis (star/galaxy);
proper motions (!)
of ~1,000,000,000 objects,
release B1.0, 2003.
AVO 2003 Nov 17-18 A T N F @ A S C 20
USNO PMM: ►flexible multiparameter
interface;► multidata output.
The best, but not perfect: no multisource query.
AVO 2003 Nov 17-18 A T N F @ A S C 21
Stage V:
A moderate resolution optical spectroscopy of 60 candidates
byAAT (4 m) AustraliaBTA (6 m) RussiaVLT (8 m) Chile
AVO 2003 Nov 17-18 A T N F @ A S C 22
Have been observed:• ААТ : spectroscopy of 12 objects• BТА : spectroscopy of 34• VLT : spectroscopy of 6======================================================== Total: 52 + 8 objects to be observed
Preliminary results:=============================================================== Stars 12 Featureless spectra 28 Sy1/Sy2/AGN 9 QSO 3=============================================================== .
AVO 2003 Nov 17-18 A T N F @ A S C 23
.
========================================================
Preliminary results:=============================================================== Stars 12 Active stars =New Featureless spectra 28 if BL Lacs =New Sy1/Sy2/AGN 9 =New QSO 3 =New=============================================================== .
AVO 2003 Nov 17-18 A T N F @ A S C 24
========================================================
Preliminary results:=============================================================== Stars 12 Featureless spectra 28 BL Lacs ? Sy1/Sy2/AGN 9 QSO 3 =============================================================== .
AVO 2003 Nov 17-18 A T N F @ A S C 25
‘Featureless’ objects 28
?
They all arestar-like (i.e., not extended in optics),
bright & hard X-ray emittersand radio sources [due to selection criteria].
AVO 2003 Nov 17-18 A T N F @ A S C 26
‘Featureless’ objects 28↓
Galactic ? Extragalactic ?
AVO 2003 Nov 17-18 A T N F @ A S C 27
‘Featureless’ objects 28 ↓
If extragalactic – BL Lacs behind the GP.
AVO 2003 Nov 17-18 A T N F @ A S C 28
‘Featureless’ objects 28
If Galactic –– they could be a NEW type of objects.
AVO 2003 Nov 17-18 A T N F @ A S C 29
‘Featureless’ objects 28
↓ EGRET sources
in the Galactic plane?
AVO 2003 Nov 17-18 A T N F @ A S C 30
No
AVO 2003 Nov 17-18 A T N F @ A S C 31
‘Featureless’ objects 27
↓ PROPER MOTION ?
AVO 2003 Nov 17-18 A T N F @ A S C 32
Yes !
AVO 2003 Nov 17-18 A T N F @ A S C 33
From USNO-PMM, six of 28 ‘featureless’ objects have p.m.
≥ 3-σ, e.g. :
AVO 2003 Nov 17-18 A T N F @ A S C 34
PROPER MOTION : ↓
MCQC J1910+28
μRA = – 0.016 ± 0.002 arcsec/y
μDEC = – 0.010 ± 0.000 arcsec/y
AVO 2003 Nov 17-18 A T N F @ A S C 35
But we have to get a close look now