Massive metal-poor stars might form massive stellar black holes (BHs) with mass 25 lt;= mBHMsolar lt;= 80 via direct collapse. We derive the number of massive BHs (N_BH) that are expected to form per galaxy through this mechanism. Such massive BHs might power most of the observed ultra-luminous X-ray sources (ULXs). We select a sample of 64 galaxies with X-ray coverage measurements of the star formation rate (SFR) and of the metallicity. We find that N_BH correlates with the number of observed ULXs per galaxy (N_ULX) in this sample. We discuss the dependence of our model on the SFR and on the metallicity.

Ultra-luminous X-ray sources and remnants of massive metal-poor stars / Mapelli, M.; Ripamonti, E.; Zampieri, L.; Colpi, M.; Bressan, A.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 408:1(2010), pp. 234-253. [10.1111/j.1365-2966.2010.17048.x]

Ultra-luminous X-ray sources and remnants of massive metal-poor stars

Bressan, A.
2010-01-01

Abstract

Massive metal-poor stars might form massive stellar black holes (BHs) with mass 25 lt;= mBHMsolar lt;= 80 via direct collapse. We derive the number of massive BHs (N_BH) that are expected to form per galaxy through this mechanism. Such massive BHs might power most of the observed ultra-luminous X-ray sources (ULXs). We select a sample of 64 galaxies with X-ray coverage measurements of the star formation rate (SFR) and of the metallicity. We find that N_BH correlates with the number of observed ULXs per galaxy (N_ULX) in this sample. We discuss the dependence of our model on the SFR and on the metallicity.
2010
408
1
234
253
https://doi.org/10.1111/j.1365-2966.2010.17048.x
https://arxiv.org/abs/1005.3548
Mapelli, M.; Ripamonti, E.; Zampieri, L.; Colpi, M.; Bressan, A.
File in questo prodotto:
File Dimensione Formato  
mapelli_2010.pdf

non disponibili

Tipologia: Versione Editoriale (PDF)
Licenza: Non specificato
Dimensione 817.56 kB
Formato Adobe PDF
817.56 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/16562
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 130
  • ???jsp.display-item.citation.isi??? 125
social impact