J/MNRAS/451/2735 Four close dSph XXM observations (Manni+, 2015)
A XMM-Newton observation of a sample of four close dwarf spheroidal galaxies.
Manni L., Nucita A.A., De Paolis F., Testa V., Ingrosso G.
<Mon. Not. R. Astron. Soc., 451, 2735-2749 (2015)>
=2015MNRAS.451.2735M 2015MNRAS.451.2735M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; X-ray sources
Keywords: X-rays: individual: Draco dSph - Leo I dSph - UMa II dSph - UMi dSph -
black hole physics
Abstract:
We present the results of the analysis of deep archival XMM-Newton
observations towards the dwarf spheroidal galaxies Draco, Leo I, Ursa
Major II (UMa II) and Ursa Minor (UMi) in the Milky Way neighbourhood.
The X-ray source population is characterized and cross-correlated with
available databases to infer their nature. We also investigate if
intermediate-mass black holes are hosted in the centre of these
galaxies. For Draco, we detect 96 high-energy sources, two of them
possibly being local stars, while no evidence for any X-ray emitting
central compact object is found. Towards the Leo I and UMa II fields
of view, we reveal 116 and 49 X-ray sources, respectively. None of
them correlates with the putative central black holes and only one is
likely associated with a UMa II local source. The study of the UMi
dwarf galaxy found 54 high-energy sources and a possible association
with a source at the dwarf spheroidal galaxy centre. We put an upper
limit on the luminosity of the central compact object of
4.02x1033erg/s. Furthermore, via the correlation with a radio source
near the galactic centre, the putative black hole should have a mass
of (2.76+32.00-2.54)x106M☉ and be radiatively inefficient.
This confirms a previous result obtained using Chandra data alone.
Description:
Our study is a high-energy characterization of dSphs. We select the
dSph sample for which XMM-Newton archival data are available. We did
not consider the Fornax dSph galaxy since it has already been studied
in detail by Orio et al. (2010, AIP Conf. Proc. 1314, 337) and Nucita
et al. (2013, Cat. J/A+A/550/A18).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 89 The X-ray sources towards the Draco dSph as
detected by the XMM-Newton satellite
table2.dat 122 116 The X-ray sources towards the Leo I dSph as
detected by the XMM-Newton satellite
table3.dat 122 49 The X-ray sources towards the UMa II dSph as
detected by the XMM-Newton satellite
table4.dat 122 54 The X-ray sources towards the UMi dSph as
detected by the XMM-Newton satellite
table5.dat 83 89 The correlation of the X-ray sources towards
the Draco dSph
table6.dat 83 116 The correlation of the X-ray sources towards
the Leo I dSph
table7.dat 83 49 The correlation of the X-ray sources towards
the UMa II dSph
table8.dat 83 54 The correlation of the X-ray sources towards
the UMi dSph
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See also:
J/A+A/550/A18 : XMM X-ray sources in Fornax dwarf galaxy (Nucita+, 2013)
Byte-by-byte Description of file: table[1234].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Src Source sequential number
5 A1 --- m_Src Multiplicity index on Src
7- 8 I2 h RAh Right ascension (J2000)
10- 11 I2 min RAm Right ascension (J2000)
13- 16 F4.1 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 28 F4.1 arcsec DEs Declination (J2000)
30- 34 F5.3 arcsec e_pos Positional error
36- 37 A2 --- l_FXabs [≤ ] Limit flag on FXabs
38- 43 F6.2 10-17W/m2 FXabs Absorbed flux in 0.2-12keV band
(in 10-14erg/cm2/s)
45- 49 F5.2 10-17W/m2 e_FXabs ? rms uncertainty on FXabs
(in 10-14erg/cm2/s)
51- 56 F6.3 [-] log(fX/fopt) ? X-to-optical flux ratio
58- 62 F5.2 --- HR*1 Hardness ratio HR*1 (H-M/(S+M+H) (1)
64- 67 F4.2 --- e_HR*1 rms uncertainty on HR*1
69- 73 F5.2 --- HR*2 Hardness ratio HR*2 (M-S/(S+M+H) (1)
75- 78 F4.2 --- e_HR*2 rms uncertainty on HR*2
80- 84 F5.2 --- HR1 ?=- Hardness ratio HR1 (B2-B1/B2+B1) (1)
86- 89 F4.2 --- e_HR1 ? rms uncertainty on HR1
91- 95 F5.2 --- HR2 ?=- Hardness ratio HR2 (B3-B2/B3+B2) (1)
97-100 F4.2 --- e_HR2 ? rms uncertainty on HR2
102-106 F5.2 --- HR3 Hardness ratio HR3 (B4-B3/B4+B3) (1)
108-111 F4.2 --- e_HR3 rms uncertainty on HR3
113-117 F5.2 --- HR4 ?=- Hardness ratio HR4 (B5-B4/B5+B4) (1)
119-122 F4.2 --- e_HR4 ? rms uncertainty on HR4
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Note (1): Energy bands as:
S = count rate in the 0.2-1.0keV band
M = count rate in the 1.0-2.0keV band
H = count rate in the 2.0-12.0keV band
B1 = count rate in the 0.2-0.5keV band
B2 = count rate in the 0.5-1.0keV band
B3 = count rate in the 1.0-2.0keV band
B4 = count rate in the 2.0-4.5keV band
B5 = count rate in the 4.5-12.0keV band
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Byte-by-byte Description of file: table[5678].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Src Source sequential number
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 14 F4.1 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 31 F4.2 arcsec qsos ? Distance to J/MNRAS/396/223/qsos,
D'Abrusco, Longo & Walton (2009) source
33- 36 F4.2 arcsec 2MASS ? Distance to 2MASS (II/246) source
38- 41 F4.2 arcsec 2MASX ? Distance to 2MASSX (VII/233) source
43- 46 F4.2 arcsec PPMX ? Distance to PPMX (I/312) source
48- 51 F4.2 arcsec PPMXL ? Distance to PPMXL (I/317) source
53- 56 F4.2 arcsec USNO-B1 ? Distance to USNO-B1 (I/284) source
58- 61 F4.2 arcsec Dist1 ? Distance to source in catalog Cat1
62 A1 --- --- [(]
63- 64 I2 --- Cat1 ? Catalog reference for Dist1 (1)
65 A1 --- --- [)]
66- 69 F4.2 arcsec Dist2 ? Distance to source in catalog Cat2
70 A1 --- --- [(]
71- 72 I2 --- Cat2 ? Catalog reference for Cat2 (1)
73 A1 --- --- [)]
75- 79 A5 --- SClass Simbad classification
81- 83 A3 --- Class HR classification
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Note (1): Catalogues as follows:
1 = Kinemuchi et al., 2008, J/AJ/136/1921/table9
2 = Kinemuchi et al., 2008, J/AJ/136/1921/table10
3 = Cavuoti et al., 2014, J/MNRAS/437/968
4 = Bonanos et al., 2004, J/AJ/127/861
5 = Bukhmastova, J/AZh/78/675
6 = Cioni & Habing, 2005, J/A+A/442/165,
7 = Held et al., J/MNRAS/404/1475/table2
8 = Ofek et al., 2012, II/313
9 = Richards et al., 2009, J/ApJS/180/67
10 = Flesch, 2010, V/134/arxa
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Jan-2016