English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present XMM-Newton and Chandra observations of two low-metallicitycometary blue compact dwarf (BCD) galaxies, Mrk 59 and Mrk 71. The first BCD,Mrk 59, contains two ultraluminous X-ray (ULX) sources, IXO 72 and IXO 73, bothassociated with bright massive stars and H II complexes, as well as one fainterextended source associated with a massive H II complex at the head of thecometary structure. The low-metallicity of Mrk 59 appears to be responsible forthe presence of the two ULXs. IXO 72 has varied little over the last 10 yr,while IXO 73 has demonstrated a variability factor of ~4 over the same period.The second BCD, Mrk 71, contains two faint X-ray point sources and two faintextended sources. One point source is likely a background AGN, while the otherappears to be coincident with a very luminous star and a compact H II region atthe "head" of the cometary structure. The two faint extended sources are alsoassociated with massive H II complexes. Although both BCDs have the samemetallicity, the three sources in Mrk 71 have X-ray luminosities ~1-2 orders ofmagnitude fainter than those in Mrk 59. The age of the starburst may play arole.

The X-ray Properties of the Cometary Blue Compact Dwarf galaxies Mrk 59 and Mrk 71