Transcript X-ray sky survey of bright, serendipitous sources with 2XMMi at the AIP

ESAC Summer Alumni Trainee Meeting 2009
X-ray sky survey
of bright, serendipitous sources
with 2XMMi at the AIP
Speaker:
Origin:
Institute:
Tutor:
Alexander Kolodzig
Humboldt-Uni Berlin, Germany
AIP (Astronomical Institute Potsdam),
Potsdam, Germany
Axel Schwope
The 2XMMi-Catalog
2XMMi = The incremental second XMM-Newton
serendipitous source catalogue
– largest X-ray source catalogue (2009)
4117
XMM-Newton observations (2000 – 2008)
– each field is visually screened
~1.0%
289083
221012
300
21.07.2009
sky area covered independently
rows of X-ray detections
unique X-ray sources
columns of information per detection
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
2
source selection
• selection conditions (among others):
– inspired by Della Ceca et al. (2004)
– bright sources:
• SOFT-Band [0.5 - 4.5 keV]
– Rate
> 0.01 counts/sec
Likelihood
> 18
Likelihood
> 12
• HARD-Band [4.5 -12.0 keV]
– Rate
> 0.002 counts/sec
– serendipitous sources
• just point sources
• off axis angle ≥ 3 arcmin  no center of the observation field
• just certain Observation Field Classes
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
3
source matching
• matching with the catalogs:
1. SDSS
2. BSS
(Sloan Digital Sky Survey) Data
Release 6
(XMM-Newton Bright Source Sample, Della Ceca et al. (2004))
– similar survey of BSS with 400 sources
3. NED
4. SIMBAD
(NASA/IPAC Extragalactic Database)
– identify possible optical counterparts
• add information of:
– optical magnitude
– red shift
– source type
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
4
SOFT-Band selection
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
5
SOFT-Band selection
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
6
HARD-Band selection
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
7
X-ray sky map
• 2XMMi-Catalog (in ecliptic coordinates)
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
8
sky map of
identified sources
• SOFT-Band (in ecliptic coordinates)
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
9
sky map of
identified sources
• HARD-Band (in ecliptic coordinates)
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
10
distribution of
known source types
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
11
distribution of
known source types
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
12
sky map of
known source types
• SOFT-Band (in ecliptic coordinates)
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
13
sky map of
known source types
• HARD-Band (in ecliptic coordinates)
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
14
comparison of
stars, galaxies & QSO’s
• ratio: X-ray flux / optical flux
SOFT-Band
HARD-Band
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
15
comparison of
stars, galaxies & QSO’s
• optical flux [mag] vs. galactic latitude [deg]
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
16
comparison of
stars, galaxies & QSO’s
• optical flux [mag] vs. galactic latitude [deg]
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
17
comparison of
stars, galaxies & QSO’s
• optical flux [mag] vs. red shift [log(z)]
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
18
comparison of
stars, galaxies & QSO’s
• optical flux [mag] vs. red shift [log(z)]
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
19
further applications
– compare optical type and X-ray source
• identify of additional or wrong optical counterparts
– development of automatic type-identifying
method for X-ray bright sources
– new list of unknown, maybe interesting X-ray
sources
 characterisation of the X-ray sky
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
20
Thank You For Your Attention!
Contributions or Questions?
e-mail: [email protected]
Backup - Slides
The 2XMMi-Catalog
• 2XMMi-Catalog:
– constructed by SSC (XMM-Newton Survey Science Centre)
– serendipitous: found by coincidence
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
23
XMM-Newton Observatory
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
24
XMM-Newton Observatory
• factsheet :
– ESA Satellite, launched 1999
– most sensitive X-ray telescope (so far)
– 3 independent X-ray cameras (PN, MOS1, MOS2)
• energy range:
• field of view:
0.15 - 15 keV
0.5 degree
– 2 X-ray reflection grating spectrometers (RGS)
– 1 independent optical/UV monitor (OM)
• simultaneous longtime observations in x-ray and
optical
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
25
XMM-Newton Observatory
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
26
Task - Overview
• my tasks:
1. selecting the “bright, serendipitous sources”
2. matching with other catalogs
3. statistics
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
27
1. Selecting
• selection-conditions (among others):
– serendipitous sources:
• just point sources
• Offaxis Angel ≥ 3 arcmin
– no detection from the center of the observation field
• Observation Field Classification:
– f = all detections are potential target
– n = the target was not detected or in the field
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
28
1. Selecting
• Selection-Conditions:
– OBS_CLASS < 4
• Quality classification of the whole observation, <10% has been flagged
– EP_EXTENT < 6 arsec
• extent radius of a source detected, < 6" = point-source
–
–
–
–
M1,M2,PN_SubMode= “FullWindow/ExtentedWindow”
TSERIES = True
(has Light-Curve)
SPECTRA = True
(has Spectra)
SUM_FLAG = 0
• summary flag of the source is derived from the EPIC flag, 0 = “none of the flags was set”
– M2_OFFAX ≥ 3 arcmin, ≤ 13 arcmin
 just serendipitous sources
– RATE and Likelihood for each BAND of the M2-Camera
• SOFT: >0.01 counts/sec ,
• HARD: >0.002 counts/sec ,
– FIELD_CLASS: n,f
Likelihood >18
Likelihood >12
 just serendipitous sources
• f - 'field', that is, all detections are potential target
• n - the target was not detected or in the field , whole field is serendipitous
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
29
1. Selecting
1. Task:
• Data mainly from EPIC MOS2-Camera:
– explained by the paper:
http://xmmssc-www.star.le.ac.uk/XID/XMMBSDellaCeca04.pdf
– detector pattern simplifies the analysis of the field
• e.g. object source target is fully contained in the central
chip
– it has the best PSF
– gaps between the EPIC MOS chips are narrower
– sensitivity with the bright sources isn’t important
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
30
2. Matching
• Matching:
– matching with coordinates (RA & DEC)
– error-radius: 3 arcsec
• possible identification of wrong optical counterparts
– Matching-Tool: “STILTS” (script-version of TOPCAT)
– purpose:
• identify possible optical counterparts
• add Information of:
– optical magnitude
– red shift
– source type
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
31
2. Matching
• matched with the following catalogs:
1. SDSS (Sloan Digital Sky Survey) Data Release 6
– 62.435 sources (with known & unknown source types)
– pre-matched catalog with 2XMMi
2. BSS
(XMM-Newton Bright Source Sample, from SSC)
– 400 sources
– similar but smaller survey of 2XMMi
3. NED
(NASA/IPAC Extragalactic Database)
– 163 million sources (with known & unknown source types)
– Data-Extraction difficult
4. SIMBAD
– 4.6 million sources
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
32
3. Statistics
offaxis angel distribution
• Plot: normalized with the circle area
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
33
3. Statistics
• Results:
Number of Sources
SOFT HARD* Description
933 (0,4%) 217 (0,1%) serendipitous bright sources
468 (50%) 121 (56%) identify sources and known type
128 (14%) 23 (11%) identify sources but unknown type
337 (36%) 73 (34%) unknown sources (so far)
*Hard-Band without “detections” which appear as well in the Soft-Band
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
34
3. Statistics
• Results: Number of Det./Src.
SOFT
3171
1104
933
HARD
1132
543/234*
473/217*
Stage
Det.: without Field-Class
Det.: total Selection
Src.: total Selection
0.42%
0.21%/0.10*%
from now just source-numbers
?
?(?)
?(?)
? (?%)
? (?%)
?*
?*(?*)
?*(?*)
?* (?%)
?* (?%)
identify with SDSS
identify with BSS (additional)
identify with NED (additional)
identify sources (known & unknown type)
unknown sources (so far)
*Hard-Band without “detections” which appear as well in the Soft-Band
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
35
X-ray sky map
• 2XMMi-Catalog (in ecliptic coordinates)
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
36
comparison of
stars, galaxies & QSO’s
• X-ray flux [log(erg/(cm²s))] vs. red shift [log(z)]
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
37
comparison of
stars, galaxies & QSO’s
• red shift [log(z)] vs. galactic latitude [deg]
•
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
38
Overview
1. ?
2. ?
3. ?
21.07.2009
2XMMi-Survey of bright sources at AIP - Alexander Kolodzig
39