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NGC1512XMM - NGC 1512/NGC 1510 XMM-Newton X-Ray Point Source Catalog

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Overview

The galaxy NGC 1512 is interacting with the smaller galaxy NGC 1510 and shows a peculiar morphology, characterized by two extended arms immersed in an HI disc whose size is about four times larger than the optical diameter of NGC 1512.

The authors have performed the first deep X-ray observation of the galaxies NGC 1512 and NGC 1510 with XMM-Newton to gain information on the population of X-ray sources and diffuse emission in this system of interacting galaxies.

They have identified and classified the sources detected in the XMM-Newton field of view by means of spectral analysis, hardness-ratios calculated with a Bayesian method, X-ray variability, and cross-correlations with catalogs in optical, infrared, and radio wavelengths. They also made use of archival Swift (X-ray) and Australia Telescope Compact Array (radio) data to better constrain the nature of the sources detected with XMM-Newton.

They detected 106 sources in the energy range of 0.2 - 12 keV, out of which 15 are located within the D25 regions of NGC 1512 and NGC 1510 and at least six sources coincide with the extended arms. They identified and classified six background objects and six foreground stars. In the reference paper, they discuss the nature of a source within the D25 ellipse of NGC 1512, whose properties indicate a quasi-stellar object or an intermediate ultra-luminous X-ray source. Taking into account the contribution of low-mass X-ray binaries and active galactic nuclei, the number of high-mass X-ray binaries detected within the D25 region of NGC 1512 is consistent with the star formation rate obtained in previous works based on radio, infrared optical, and UV wavelengths. The authors detected diffuse X-ray emission from the interior region of NGC 1512 with a plasma temperature of kT = 0.68(0.31-0.87) keV and a 0.3 - 10 keV X-ray luminosity of 1.3E+38erg/s, after correcting for unresolved discrete sources.

The galaxy pair NGC 1512/1510 was observed with XMM-Newton (ObsID: 0693160101) between 2012 June 16 (20:31 UTC) and 2012 June 17 (16:24 UTC) in a single, 63-ks exposure observation. The data analysis was performed through the XMM-Newton Science Analysis System (SAS) software (version 12.0.1). The observation was largely contaminated by high background due to proton flares. After rejecting time intervals affected by high background, the net good exposure time was reduced to 26.0 ks for PN, 39.8 ks for the MOS1 and 34.8 ks for the MOS2. For each instrument, the data were divided into five energy bands:

     B1 : 0.2 - 0.5 keV
     B2 : 0.5 - 1.0 keV
     B3 : 1.0 - 2.0 keV
     B4 : 2.0 - 4.5 keV
     B5 : 4.5 - 12.0 keV

For the PN, data were filtered to include only single events (PATTERN = 0) in the energy band B__1, and single and double events (PATTERN <= 4) for the other energy bands. The authors excluded the energy range 7.2 - 9.2 keV to reduce the background produced by strong fluorescence lines in the outer detector area. For the MOS, single to quadruple events (PATTERN <= 12) were selected.

The source detection procedure is described in Section 2.1 of the reference paper. In the final step, the authors adopted a minimum likelihood of L = 6. They removed false detections (artifacts on the detectors or diffuse emission structures) by visual inspection. They detected 106 total point sources in the NGC 1512/1510 field of view.


Catalog Bibcode

2014A&A...566A.115D

References

XMM-Newton observation of the interacting galaxies NGC 1512 and NGC 1510.
    Ducci L., Kavanagh P.J., Sasaki M., Koribalski B.S.
    <Astron. Astrophys. 566, A115 (2014)>
    =2014A&A...566A.115D        (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in July 2014 based on CDS Catalog J/A+A/566/A115 files tableb1.dat and tableb2.dat.

Parameters

Source_Number
A unique identification number for each XMM-Newton X-ray source in this table in order of increasing J2000.0 Right Ascension.

Name
The X-ray source designation invented by the HEASARC, in the style recommended by the CDS Dictionary of Nomenclature of Celestial Objects, using the '[DKS2014]' prefix (for Ducci, Kavanagh, Sasaki 2014) and the source number.

RA
The Right Ascension of the XMM-Newton X-ray source in the selected equinox. This was given in J2000.0 sexagesimal coordinates to a precision of 0.01 seconds of time in the original table. These coordinates were astrometrically corrected by comparing the original X-ray positions of the sources identified as foreground or background objects (except for source No. 61, which appears to be extended on the DSS maps) with the positions of their optical and infrared counterparts in the USNO-B1 and 2MASS catalogs, respectively, resulting in a systematic correction in the Declination of the positions of -1.44 +/- 0.54 arcseconds (the offset in RA was not statistically significant).

Dec
The Declination of the XMM-Newton X-ray source in the selected equinox. This was given in J2000.0 sexagesimal coordinates to a precision of 0.1 arcseconds in the original table. These coordinates were astrometrically corrected by comparing the original X-ray positions of the sources identified as foreground or background objects (except for source No. 61, which appears to be extended on the DSS maps) with the positions of their optical and infrared counterparts in the USNO-B1 and 2MASS catalogs, respectively, resulting in a systematic correction in the Declination of the positions of -1.44 +/- 0.54 arcseconds (the offset in RA was not statistically significant).

LII
The Galactic Longitude of the XMM-Newton X-ray source.

BII
The Galactic Latitude of the XMM-Newton X-ray source.

Error_Radius
The XMM-Newton X-ray source positional uncertainty, in arcseconds.

Count_Rate
The combined (PN + MOS1 + MOS2) count rate of the XMM-Newton X-ray source in the 0.2-12 keV band, in ct/s.

Count_Rate_Error
The uncertainty in the combined (PN + MOS1 + MOS2) count rate of the XMM-Newton X-ray source in the 0.2-12 keV band, in ct/s.

Detection_Likelihood
The detection likelihood L of the XMM-Newton X-ray source, defined by the relationship L = - ln(p), where p is the probability that a Poissonian fluctuation in the background is detected as a spurious source. The final step in the detection process used a minimum likelihood L = 6.

Hardness_Ratio_1
The hardness ratio HR1 of the XMM-Newton X-ray source between bands 1 and 2 (see Overview for the band definitions) where HR1 = (B2 - B1)/(B2 + B1), and Bi is the count rate in band i. See Section 3.2 of the reference paper for more details.

Hardness_Ratio_1_Pos_Err
The upper uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_1_Neg_Err
The lower uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_2
The hardness ratio HR2 of the XMM-Newton X-ray source between bands 2 and 3 (see Overview for the band definitions) where HR2 = (B3 - B2)/(B3 + B2), and Bi is the count rate in band i. See Section 3.2 of the reference paper for more details.

Hardness_Ratio_2_Pos_Err
The upper uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_2_Neg_Err
The lower uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_3
The hardness ratio HR3 of the XMM-Newton X-ray source between bands 3 and 4 (see Overview for the band definitions) where HR3 = (B4 - B3)/(B4 + B3), and Bi is the count rate in band i. See Section 3.2 of the reference paper for more details.

Hardness_Ratio_3_Pos_Err
The upper uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_3_Neg_Err
The lower uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_4
The hardness ratio HR4 of the XMM-Newton X-ray source between bands 4 and 5 (see Overview for the band definitions) where HR4 = (B5 - B4)/(B5 + B4), and Bi is the count rate in band i. See Section 3.2 of the reference paper for more details.

Hardness_Ratio_4_Pos_Err
The upper uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

Hardness_Ratio_4_Neg_Err
The lower uncertainty in the corresponding hardness ratio for the XMM-Newton X-ray source.

USNOB1_Name
The USNO-B1 (CDS Cat. I/284) identification of the optical counterpart to the XMM-Newton X-ray source.

TwoMASS_Name
The 2MASS (CDS Cat. II/246) identification of the infrared counterpart to the XMM-Newton X-ray source.

Alt_Name
An alternative identifications for the counterpart to the XMM-Newton X-ray source.

Radio_Name
The identification of the radio counterpart to the XMM-Newton X-ray source. The authors used the 20-cm radio continuum maps of Koribalski and Lopez-Sanchez (2009, MNRAS, 400, 1749) with 8 and 15 arcseconds resolution to find possible radio counterparts of the X-ray sources that they detected with XMM-Newton. They found nine radio counterparts of sources 13, 23, 29 (nuclear region of NGC 1510), 54 (nuclear region of NGC 1512), 67, 71, 83, 94, and 98. These have been given radio source names of the form 'ATCA JHHMMSSss-DDMMSSs' based on their J2000.0 equatorial coordinates. The authors used these radio associations to classify five background objects (see Section 4.2 of the reference paper).

Source_Type
The source type classification of the XMM-Newton X-ray source: background object, foreground star, galaxy, 'QSO or XRB', or NGC 1510 (for source 29 which lies in the nuclear region of NGC 1510).

Class
The HEASARC Browse object classification, based on the value of the source_type parameter.


Contact Person

Questions regarding the NGC1512XMM database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 9-Jul-2014