J/A+A/429/963 XMM-Newton observation of the rho Oph cloud (Ozawa+, 2005)
The X-ray emission from Young Stellar Objects in the rho Ophiuchi cloud core
as seen by XMM-Newton.
Ozawa H., Grosso N., Montmerle T.
<Astron. Astrophys. 429, 963 (2005)>
=2005A&A...429..963O 2005A&A...429..963O
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; X-ray sources
Keywords: Galaxy: open clusters and associations: individual: rho Ophiuchi cloud
stars: pre-main sequence - stars: low-mass, brown dwarfs -
X-rays: stars - infrared: stars
Abstract:
We observed the main core F of the rho Ophiuchi cloud, an active
star-forming region located at d∼140pc, using XMM-Newton with an
exposure of 33ks on February 19, 2001. We detect 87 X-ray sources
within the 30' diameter field-of-view of the EPIC imaging detector
array with significance above 4.4 sigma. We cross-correlate the
positions of XMM-Newton X-ray sources with previous X-ray, infrared
(IR), and optical catalogs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 87 The list of the X-ray sources detected by XMM-Newton
table2.dat 108 87 Identification of the XMM-Newton sources with
known X-ray sources and optical/infrared sources
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See also:
J/A+A/359/113 : X-ray and IR study of rho Oph dark cloud (Grosso+, 2000)
J/A+A/372/173 : ISOCAM observations of rho Ophiuchi cloud (Bontemps+, 2001)
J/ApJ/438/813 : Stellar population in rho Oph cloud core (Strom+, 1995)
J/ApJS/112/109 : rho Oph near-IR positions and photometry (Barsony+, 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- ROXN XMM-Newton source ID number, ROXN- (1)
4- 5 I2 h RAh Right ascension (J2000.0)
7- 8 I2 min RAm Right ascension (J2000.0)
10-13 F4.1 s RAs Right ascension (J2000.0)
15 A1 --- DE- Declination sign (J2000.0)
16- 17 I2 deg DEd Declination (J2000.0)
19- 20 I2 arcmin DEm Declination (J2000.0)
22- 25 F4.1 arcsec DEs Declination (J2000.0)
27- 29 F3.1 arcsec e_Pos Position error
31- 35 F5.1 ct/ks CRM1 ? Count rate for MOS1 (2)
37- 40 F4.1 ct/ks e_CRM1 ? Error of count rate for MOS1 (2)
42- 46 F5.2 --- HRM1 ? Hardness ratio for MOS1 (2)
48- 51 F4.2 --- e_HRM1 ? Hardness ratio error for MOS1 (2)
53- 57 F5.1 ct/ks CRM2 ? Count rate for MOS2 (2)
59- 62 F4.1 ct/ks e_CRM2 ? Error of count rate for MOS2 (2)
64- 68 F5.2 --- HRM2 ? Hardness ratio for MOS2 (2) (3)
70- 73 F4.2 --- e_HRM2 ? Hardness ratio error for MOS2 (2) (3)
75- 79 F5.1 ct/ks CRPN ? Count rate for PN (2)
81- 84 F4.1 ct/ks e_CRPN ? Error of count rate for PN (2)
86- 90 F5.2 --- HRPN ? Hardness ratio for PN (2) (3)
92- 95 F4.2 --- e_HRPN ? Hardness ratio error for PN (2) (3)
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Note (1): ROXN-n for "Rho Oph X-ray sources, Newton n"
Note (2): The blancs indicate that the X-ray sources are outside the
field of view of the instrument.
Note (3): The hardness ratio is calculated by the equation:
HR=(H-S)/(H+S),
where S and H are counts in the 0.3-2.0keV band and in the 2.0-8.0keV
band, respectively. Note that due to pile-up, HR is maybe not reliable
for source 1.
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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- 2 I2 --- ROXN XMM-Newton source ID number, ROXN- (1)
3 A1 --- NEW Flag of New X-ray source (2)
5- 7 A3 --- ROX Einstein number (Montmerle et al.,
1983ApJ...269..182M 1983ApJ...269..182M) (3) (4)
9- 11 A3 --- ROXR1 ROSAT PSPC number (Casanova et al.,
1995ApJ...439..752C 1995ApJ...439..752C) (3)
14- 15 I2 --- ROXR2 ? ROSAT PSPC number (Casanova et al.,
1994PhDT.......268C 1994PhDT.......268C) (3)
17- 19 A3 --- ROXA ASCA number (Kamata et al.,
1997PASJ...49..461K 1997PASJ...49..461K) (3)
21 A1 --- --- [F]
22- 23 I2 --- ROXRF ? ROSAT HRI number (Grosso et al., 2000,
Cat. J/A+A/359/111) (3)
26- 27 I2 --- [IKT2001] ? Chandra number (Imanishi et al.,
2001ApJ...557..747I 2001ApJ...557..747I) (3)
29- 31 I3 --- ISO-Oph ? ISO ISOCAM number (Bontemps et al., 2001,
Cat. J/A+A/371/173) (3)
33- 48 A16 --- 2MASSJ 2MASS number (Cat. II/246, HHMMSSss+DDMMSSs)
50 A1 --- l_Jmag Limit flag for J band
51- 55 F5.2 mag Jmag ? J band magnitude
57 A1 --- l_Hmag Limit flag for H band
58- 62 F5.2 mag Hmag ? H band magnitude
64- 68 F5.2 mag Ksmag ? Ks band magnitude
70 A1 --- l_J-H Limit flag for J-H
71- 74 F4.2 mag J-H ? J-H magnitude
76 A1 --- l_H-Ks Limit flag for H-Ks
77- 80 F4.2 mag H-Ks ? H-Ks magnitude
82- 98 A17 --- Name Name of the known sources (5)
100 A1 --- FS [f] f: foreground stars (6)
102-105 A4 --- Class Classification of the YSO (6)
107-108 A2 --- BD [bd ] Brown dwarfs (7)
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Note (1): ROXN-n for "Rho Oph X-ray sources, Newton n".
Note (2): The asterisks indicate new X-ray sources found in this observation.
Note (3): The identification with source catalogs.
Blanks indicate that the XMM-Newton sources have no known counterpart.
The hyphens indicate that the XMM-Newton sources are outside the field
of view of the instruments.
Note (4): Grosso (2001A&A...370L..22G 2001A&A...370L..22G) shows that one of these Einstein
observation has detected an X-ray source associated with the YLW16
(ROXN-46) IR source group.
Note (5): For the source naming convention, see Andre & Montmerle
(1994ApJ...420..837A 1994ApJ...420..837A) and references therein.
- The source names beginning with BKLT are from Barsony et al. (1997,
Cat. J/ApJS/112/109).
- 0600-2053 is from the catalog USNO-A1.0 (Monet et al., 1996,
Cat. I/243, See USNO-A2.0, Cat. I/252).
Note (6): The classifications of Class I, II, and III are from Bontemps
et al. (2001, Cat. J/A+A/371/173), Andre & Montmerle
(1994ApJ...420..837A 1994ApJ...420..837A) or Martin et al. (1998MNRAS.300..733M 1998MNRAS.300..733M). The
Class III candidates proposed in this paper are indicated by "nIII".
Note (7): The bona fide brown dwarfs are indicated by "bd".
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Acknowledgements: Hideki Ozawa, Hideki.Ozawa(at)obs.ujf-grenoble.fr
(End) Hideki Ozawa [LAOG, France], Patricia Vannier [CDS] 04-Jan-2005