Distances to Anomalous X‐Ray Pulsars Using Red Clump Stars | Zendy

Martin Durant | Zendy; M. H. van Kerkwijk | Zendy

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Distances to Anomalous X‐Ray Pulsars Using Red Clump Stars

Author(s) -

Martin Durant,

M. H. van Kerkwijk

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506380

Subject(s) - physics , astrophysics , stars , pulsar , red clump , black body radiation , extinction (optical mineralogy) , spectroscopy , astronomy , spiral galaxy , metallicity , radiation , quantum mechanics , optics

We identify `red clump stars' - core helium-burning giants - among 2MASSstars and use them to measure the run of reddening with distance in thedirection of each of the Galactic Anomalous X-ray Pulsars (AXP). We combinethis with extinction estimates from X-ray spectroscopy to infer distances andfind that the locations of all AXP are consistent with being in Galactic spiralarms. We also find that the 2-10 keV luminosities implied by our distances areremarkably similar for all AXPs, being all around 1.3e35 erg s-1. Furthermore,using our distances to estimate effective black-body emitting radii, we findthat the radii are tightly anti-correlated with pulsed fraction, and somewhatless tightly anti-correlated with black-body temperature. We find no obviousrelationship of any property with the dipole magnetic field strength inferredfrom the spin-down rate.Comment: 38 pages aastex, 10 figures. Accepted for publication in Ap

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