Abstract

10.1002/asna.200385074.abs We present a catalog of 2357 point sources detected during 620 ks of Chandra observations of the 17 × 17 arcminutes field around Sgr A*. This field encompasses a physical area of 40 × 40 parsecs at 8 kpc. The completeness limit of the sample at the Galactic Center is ≈1031 erg s-1 (2-8 keV), while the detection limit is an order of magnitude lower. We estimate that 20-100 of the observed sources are background AGN. The spectra of the majority of the Galactic Center sources are very hard and are best described by a power law (E) with photon index Γ < 1. Such hard spectra are only seen from magnetically accreting white dwarfs (polars and intermediate polars) and neutron stars (pulsars). The spatial density of the Galactic Center X-ray sources falls off as R-2, similar to that of the infrared stars in the field. This highlights the possibility that these X-ray sources can be used to study the history of star formation at the Galactic Center. The log(N) - log(S) distribution of the Galactic Center sources is extremely steep, such that point sources could account for all of the previously reported diffuse emission if the number counts extend down to 1029 erg s-1 with the same slope. However, there are numerous fllamentary structures in the field that also contribute to the total flux, which implies that the luminosity distribution between 2-8 keV must turn over below our completeness limit.

Original languageEnglish (US)
Pages (from-to)33-39
Number of pages7
JournalAstronomische Nachrichten
Volume324
Issue numberSUPPL.1
DOIs
StatePublished - Sep 1 2003

Fingerprint

erg
point source
galaxies
stars
completeness
turnover
power law
x rays
point sources
infrared stars
history
pulsars
neutron stars
catalogs
star formation
luminosity
distribution
histories
slopes
photons

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Muno, M. P. ; Baganoff, F. K. ; Bautz, M. W. ; Brandt, William Nielsen ; Broos, Patrick Sean ; Feigelson, Eric ; Garmire, G. P. ; Morris, M. R. ; Ricker, G. R. ; Townsley, Leisa K. / Two Thousand X-ray Stars in the Central 20 pc of the Galaxy. In: Astronomische Nachrichten. 2003 ; Vol. 324, No. SUPPL.1. pp. 33-39.
@article{25234368b798495d90b85a67551c61be,
title = "Two Thousand X-ray Stars in the Central 20 pc of the Galaxy",
abstract = "10.1002/asna.200385074.abs We present a catalog of 2357 point sources detected during 620 ks of Chandra observations of the 17 × 17 arcminutes field around Sgr A*. This field encompasses a physical area of 40 × 40 parsecs at 8 kpc. The completeness limit of the sample at the Galactic Center is ≈1031 erg s-1 (2-8 keV), while the detection limit is an order of magnitude lower. We estimate that 20-100 of the observed sources are background AGN. The spectra of the majority of the Galactic Center sources are very hard and are best described by a power law (E-Γ) with photon index Γ < 1. Such hard spectra are only seen from magnetically accreting white dwarfs (polars and intermediate polars) and neutron stars (pulsars). The spatial density of the Galactic Center X-ray sources falls off as R-2, similar to that of the infrared stars in the field. This highlights the possibility that these X-ray sources can be used to study the history of star formation at the Galactic Center. The log(N) - log(S) distribution of the Galactic Center sources is extremely steep, such that point sources could account for all of the previously reported diffuse emission if the number counts extend down to 1029 erg s-1 with the same slope. However, there are numerous fllamentary structures in the field that also contribute to the total flux, which implies that the luminosity distribution between 2-8 keV must turn over below our completeness limit.",
author = "Muno, {M. P.} and Baganoff, {F. K.} and Bautz, {M. W.} and Brandt, {William Nielsen} and Broos, {Patrick Sean} and Eric Feigelson and Garmire, {G. P.} and Morris, {M. R.} and Ricker, {G. R.} and Townsley, {Leisa K.}",
year = "2003",
month = "9",
day = "1",
doi = "10.1002/asna.200385074",
language = "English (US)",
volume = "324",
pages = "33--39",
journal = "Astronomische Nachrichten",
issn = "0004-6337",
publisher = "Wiley-VCH Verlag",
number = "SUPPL.1",

}

Muno, MP, Baganoff, FK, Bautz, MW, Brandt, WN, Broos, PS, Feigelson, E, Garmire, GP, Morris, MR, Ricker, GR & Townsley, LK 2003, 'Two Thousand X-ray Stars in the Central 20 pc of the Galaxy', Astronomische Nachrichten, vol. 324, no. SUPPL.1, pp. 33-39. https://doi.org/10.1002/asna.200385074

Two Thousand X-ray Stars in the Central 20 pc of the Galaxy. / Muno, M. P.; Baganoff, F. K.; Bautz, M. W.; Brandt, William Nielsen; Broos, Patrick Sean; Feigelson, Eric; Garmire, G. P.; Morris, M. R.; Ricker, G. R.; Townsley, Leisa K.

In: Astronomische Nachrichten, Vol. 324, No. SUPPL.1, 01.09.2003, p. 33-39.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two Thousand X-ray Stars in the Central 20 pc of the Galaxy

AU - Muno, M. P.

AU - Baganoff, F. K.

AU - Bautz, M. W.

AU - Brandt, William Nielsen

AU - Broos, Patrick Sean

AU - Feigelson, Eric

AU - Garmire, G. P.

AU - Morris, M. R.

AU - Ricker, G. R.

AU - Townsley, Leisa K.

PY - 2003/9/1

Y1 - 2003/9/1

N2 - 10.1002/asna.200385074.abs We present a catalog of 2357 point sources detected during 620 ks of Chandra observations of the 17 × 17 arcminutes field around Sgr A*. This field encompasses a physical area of 40 × 40 parsecs at 8 kpc. The completeness limit of the sample at the Galactic Center is ≈1031 erg s-1 (2-8 keV), while the detection limit is an order of magnitude lower. We estimate that 20-100 of the observed sources are background AGN. The spectra of the majority of the Galactic Center sources are very hard and are best described by a power law (E-Γ) with photon index Γ < 1. Such hard spectra are only seen from magnetically accreting white dwarfs (polars and intermediate polars) and neutron stars (pulsars). The spatial density of the Galactic Center X-ray sources falls off as R-2, similar to that of the infrared stars in the field. This highlights the possibility that these X-ray sources can be used to study the history of star formation at the Galactic Center. The log(N) - log(S) distribution of the Galactic Center sources is extremely steep, such that point sources could account for all of the previously reported diffuse emission if the number counts extend down to 1029 erg s-1 with the same slope. However, there are numerous fllamentary structures in the field that also contribute to the total flux, which implies that the luminosity distribution between 2-8 keV must turn over below our completeness limit.

AB - 10.1002/asna.200385074.abs We present a catalog of 2357 point sources detected during 620 ks of Chandra observations of the 17 × 17 arcminutes field around Sgr A*. This field encompasses a physical area of 40 × 40 parsecs at 8 kpc. The completeness limit of the sample at the Galactic Center is ≈1031 erg s-1 (2-8 keV), while the detection limit is an order of magnitude lower. We estimate that 20-100 of the observed sources are background AGN. The spectra of the majority of the Galactic Center sources are very hard and are best described by a power law (E-Γ) with photon index Γ < 1. Such hard spectra are only seen from magnetically accreting white dwarfs (polars and intermediate polars) and neutron stars (pulsars). The spatial density of the Galactic Center X-ray sources falls off as R-2, similar to that of the infrared stars in the field. This highlights the possibility that these X-ray sources can be used to study the history of star formation at the Galactic Center. The log(N) - log(S) distribution of the Galactic Center sources is extremely steep, such that point sources could account for all of the previously reported diffuse emission if the number counts extend down to 1029 erg s-1 with the same slope. However, there are numerous fllamentary structures in the field that also contribute to the total flux, which implies that the luminosity distribution between 2-8 keV must turn over below our completeness limit.

UR - http://www.scopus.com/inward/record.url?scp=84874729922&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84874729922&partnerID=8YFLogxK

U2 - 10.1002/asna.200385074

DO - 10.1002/asna.200385074

M3 - Article

AN - SCOPUS:84874729922

VL - 324

SP - 33

EP - 39

JO - Astronomische Nachrichten

JF - Astronomische Nachrichten

SN - 0004-6337

IS - SUPPL.1

ER -