J/A+A/507/241 IR and 610MHz observations in MGRO J2019+37 (Paredes+, 2009)
Radio continuum and near-infrared study of the MGRO J2019+37 region.
Paredes J.M., Marti J., Ishwara-Chandra C.H., Sanchez-Sutil J.R.,
Munoz-Arjonilla A.J., Moldon J., Peracaula M., Luque-Escamilla P.L.,
Zabalza V., Bosch-Ramon V., Bordas P., Romero G.E., Ribo M.
<Astron. Astrophys. 507, 241 (2009)>
=2009A&A...507..241P 2009A&A...507..241P
ADC_Keywords: Gamma rays ; Radio sources ; X-ray sources ; H II regions
Keywords: gamma rays: observations - HII regions - infrared: stars -
radio continuum: stars - X-rays: binaries
Abstract:
MGROJ2019+37 is an unidentified extended source of very high energy
gamma-rays originally reported by the Milagro Collaboration as the
brightest TeV source in the Cygnus region. Its extended emission could
be powered by either a single or several sources. The GeV pulsar AGL
J2020.5+3653 discovered by AGILE and associated with PSR J2021+3651
could contribute to the emission from MGRO J2019+37.
The aim of this paper is to identify radio and near-infrared sources
in the field of the extended TeV source MGRO J2019+37, and study
potential counterparts to explain its emission.
We surveyed a region of about 6 square degrees with the Giant
Metrewave Radio Telescope (GMRT) at the frequency 610MHz. We also
observed the central square degree of this survey in the near-infrared
Ks-band using the 3.5m telescope in Calar Alto. Archival X-ray
observations of some specific fields are included. VLBI observations
of an interesting radio source were performed. We explored possible
scenarios to produce the multi-TeV emission from MGRO J2019+37 and
studied which of the sources could be the main particle accelerator.
Description:
This table contains information about all radio sources detected with
the Giant Metrewave Radio Telescope (GMRT) of the National Centre for
Radio Astrophysics (NCRA) in Khodad (India) in the MGRO J2019+37
region. The observations were carried out at 610MHz (49cm wavelength)
in July 2007. An hexagonal pattern of 19 pointings was designed in
order to cover the region of 2.5 square degree centered on the MGRO
J2019+37 peak of emission.
The list of sources was determined using the SExtractor automatic
procedure over our 5" resolution radio mosaic. Only sources with
peak ux density higher than about ten times the local noise after
primary beam correction were included.
There are 42 of the 362 detected radio sources inside the area imaged
in the near-infrared Ks-band. A total of 6 out of these 42 sources
have a near-infrared counterpart candidate within 0.6" of their radio
position. On the other hand, a total of 41 of the 362 radio sources
are located in fields observed in X-rays. In this case, 5 of the 41
radio sources have an X-ray counterpart candidate within 5" (the
typical uncertainty for XMM-Newton). Both, the Ks magnitude and the
X-ray flux, are listed when available.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 98 362 List of GMRT sources detected
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq GMRT source number
5- 8 A4 --- --- [GMRT]
9- 24 A16 --- GMRT GMRT source name (JHHMMSS.s+DDMMSS)
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 36 F5.2 s RAs Right ascension (J2000)
38 A1 --- DE- Declination sign (J2000)
39- 40 I2 deg DEd Declination (J2000)
42- 43 I2 arcmin DEm Declination (J2000)
45- 48 F4.1 arcsec DEs Declination (J2000)
50- 56 F7.2 mJy Speak Peak flux density at 610MHz (in mJy/beam)
58- 61 F4.2 mJy Noise Local noise (in mJy/beam)
63- 69 F7.2 mJy Sint Integrated flux density at 610MHz
71- 74 F4.2 mJy e_Sint Error in integrated flux density
76- 78 A3 --- IR Near-infrared detection (1)
80- 83 F4.1 mag Ksmag ? Magnitude (apparent) in Ks filter
85- 87 A3 --- XR X-ray detection (2)
89- 93 F5.2 10-16W/m2 XFlux ? X-ray (0.2-12keV) flux (10-13erg/cm2/s)
95- 98 F4.2 10-16W/m2 e_XFlux ? Error in X-ray flux
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Note (1): Near-infrared detection meaning:
--- = Not covered
ND = Covered, but not detected
D = Counterpart candidate detected, magnitude in Kmag column
Note (2): X-ray detection meaning:
--- = Not covered
ND = Covered, but not detected
D = Counterpart candidate detected, X-ray flux in XFlux column
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Acknowledgements:
Juan Ramon Sanchez Sutil, jrssutil(at)ujaen.es
References:
Abdo et al., 2007ApJ...658L..33A 2007ApJ...658L..33A,
Discovery of TeV Gamma-Ray Emission from the Cygnus Region
(End) Patricia Vannier [CDS] 10-Sep-2009