Astrophys. J., 758, 15 (2012/October-2)
The Chandra Local Volume Survey: the X-ray point-source catalog of NGC 300.
BINDER B., WILLIAMS B.F., ERACLEOUS M., GAETZ T.J., PLUCINSKY P.P., SKILLMAN E.D., DALCANTON J.J., ANDERSON S.F., WEISZ D.R. and KONG A.K.H.
Abstract (from CDS):
We present the source catalog of a new Chandra ACIS-I observation of NGC 300 obtained as part of the Chandra Local Volume Survey. Our 63 ks exposure covers ∼88% of the D25 isophote (R ~ 6.3 kpc) and yields a catalog of 95 X-ray point sources detected at high significance to a limiting unabsorbed 0.35-8 keV luminosity of ∼1036 erg/s. Sources were cross-correlated with a previous XMM-Newton catalog, and we find 75 "X-ray transient candidate" sources that were detected by one observatory, but not the other. We derive an X-ray scale length of 1.7±0.2 kpc and a recent star formation rate of 0.12 M☉/yr in excellent agreement with optical observations. Deep, multi-color imaging from the Hubble Space Telescope, covering ∼32% of our Chandra field, was used to search for optical counterparts to the X-ray sources, and we have developed a new source classification scheme to determine which sources are likely X-ray binaries, supernova remnants, and background active galactic nucleus candidates. Finally, we present the X-ray luminosity functions (XLFs) at different X-ray energies, and we find the total NGC 300 X-ray point-source population to be consistent with other late-type galaxies hosting young stellar populations ( ≲ 50 Myr). We find that XLF of sources associated with older stellar populations has a steeper slope than the XLF of X-ray sources coinciding with young stellar populations, consistent with theoretical predictions.
galaxies: individual: NGC 300 - galaxies: spiral - X-rays: binaries - X-rays: galaxies
VizieR on-line data:
<Available at CDS (J/ApJ/758/15): table4.dat table5.dat table6.dat table7.dat table16.dat>
Tables 4-7, Col(ID): CXOLV JHHMMSS.ss+DDMMSS.s N=95 = Tables 4-7, Col(Seq): [BWE2012] NGC 300 NN (Nos 1-95).
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