J/A+A/472/557 Cygnus OB2 region 610MHz sources (Marti+, 2007)
Deep radio images of the HEGRA and Whipple TeV sources in the Cygnus OB2 region.
Marti J., Paredes J.M., Ishwara Chandra C.H., Bosch-Ramon V.
<Astron. Astrophys., 472, 557-564 (2007)>
=2007A&A...472..557M 2007A&A...472..557M
ADC_Keywords: Radio sources ; Associations, stellar ; Morphology
Keywords: radio continuum: stars - X-rays: binaries - galaxies: active -
gamma rays: observations
Abstract:
The modern generation of Cherenkov telescopes has revealed a new
population of gamma-ray sources in the Galaxy. Some of them have been
identified with previously known X-ray binary systems while other
remain without clear counterparts a lower energies. Our initial goal
here was reporting on extensive radio observations of the first
extended and yet unidentified source, namely TeV J2032+4130. This
object was originally detected by the HEGRA telescope in the direction
of the Cygnus OB2 region and its nature has been a matter of debate
during the latest years. The situation has become more complex with
the Whipple and MILAGRO telescopes new TeV detections in the same
field which could be consistent with the historic HEGRA source,
although a different origin cannot be ruled out.
We aim to pursue our radio exploration of the TeV J2032+4130 position
that we initiated in a previous paper but taking now into account the
latest results from new Whipple and MILAGRO TeV telescopes. The data
presented here are an extended follow up of our previous work.
Description:
The observations were carried out at 610MHz (49cm wavelength) on
2005 July 9 and September 1 with the Giant Metrewave Radio Telescope
(GMRT). On 2005 April 29, we observed the field of TeV J2032+4130 in
the near infrared Ks-band (2.2um) using the Calar Alto 3.5m telescope
and the OMEGA2000 camera at CAHA.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 93 153 Catalogue of GMRT sources detected at 610MHz
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See also:
J/AJ/107/1433 : Cygnus OB2 polarimetry (Kobulnicky+, 1994)
J/A+AS/111/407 : VI Cygni red + reddened stars (Parthasarathy+, 1995)
J/MNRAS/298/753 : Variables in Cygnus OB2 (Pigulski+ 1998)
J/ApJS/149/123 : WSRT survey of Cygnus OB2 (Setia Gunawan+, 2003)
J/A+A/464/211 : Cygnus OB2 stellar population with Chandra (Albacete+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 12 F6.3 s RAs Right ascension (J2000)
14- 18 F5.3 s e_RAs rms uncertainty on RA
20 A1 --- DE- Declination sign (J2000)
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 31 F5.2 arcsec DEs Declination (J2000)
33- 36 F4.2 arcsec e_DEs rms uncertainty on DE
38- 43 F6.2 mJy Speak Flux density at 610MHz, in mJy/beam
45- 48 F4.2 mJy e_Speak rms uncertainty on Speak, in mJy/beam
49 A1 --- n_Speak [a-f] Note on Speak (1)
51- 56 F6.2 mJy Sint Integrated flux at 610MHz
58- 61 F4.2 mJy e_Sint rms uncertainty on Sint
63- 67 F5.2 arcsec amaj Major axis
69- 72 F4.2 arcsec e_amaj rms uncertainty on amaj
74- 78 F5.2 arcsec bmaj Minor axis
80- 83 F4.2 arcsec e_bmaj rms uncertainty on bmaj
85- 89 F5.1 deg PA Position angle
91- 93 I3 deg e_PA rms uncertainty on PA
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Note (1): Notes as follows:
a = Same as source #3, VLA-North and Chandra #234 within the HEGRA
circle in Paredes et al. (2007ApJ...654L.135P 2007ApJ...654L.135P).
b = Same as source #4 within the HEGRA circle in Paredes et al.
(2007ApJ...654L.135P 2007ApJ...654L.135P).
c = Same as source #6 within the HEGRA circle in Paredes et al.
(2007ApJ...654L.135P 2007ApJ...654L.135P).
d = Likely the 610MHz radio counterpart of the contact binary system
Cyg OB2 No. 5.
e = Likely the 610MHz radio counterpart of the luminous star
Cyg OB2 No. 12.
f = Likely the 610MHz radio counterpart of the luminous star
Cyg OB2 No. 9.
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Nomenclature:
Objects identified as [MPI2007] JHHMMSS.sss+DDMMSS.ss in Simbad
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Nov-2007