The Chandra Local Volume Survey: The X-ray Point Source Catalog of NGC 300

Abstract

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 ~10^36 erg s^-1. 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 Msun yr^-1, 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 AGN 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 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.

23 pages, 13 figures. Accepted to ApJ

References in corpus (10)

• The ACS Nearby Galaxy Survey Treasury
• On the mass-to-light ratio of the local Galactic disc and the optical luminosity of the Galaxy
• The XMM-Newton wide-field survey in the COSMOS field. The point-like X-ray source catalogue
• Specific SFR profiles in nearby spiral galaxies: quantifying the inside-out formation of disks
• A new method for determining the sensitivity of X-ray imaging observations and the X-ray number counts
• The ACS Nearby Galaxy Survey Treasury V. Radial Star Formation History of NGC 300
• Chandra ACIS Survey of M33 (ChASeM33): A First Look
• The Chandra Small Magellanic Cloud Wing Survey - the search for X-ray Binaries
• High Mass X-ray Binaries and Recent Star Formation History of the Small Magellanic Cloud
• The Chandra ACIS Survey of M33 (ChASeM33): Transient X-ray Sources Discovered in M33

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