English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51

Castillo, G. A. R., Israel, G. L., Belfiore, A., Bernardini, F., Esposito, P., Pintore, F., et al. (2020). Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51. The Astrophysical Journal, 895(1): 60. doi:10.3847/1538-4357/ab8a44.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0006-C078-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C079-9
Genre: Journal Article

Files

show Files
hide Files
:
Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51.pdf (Any fulltext), 2MB
 
File Permalink:
-
Name:
Discovery of a 2.8 s pulsar in a 2 d orbit High-Mass X-ray Binary powering the Ultraluminous X-ray source ULX-7 in M51.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Castillo, G. A. Rodríguez, Author
Israel, G. L., Author
Belfiore, A., Author
Bernardini, F., Author
Esposito, P., Author
Pintore, F., Author
Luca, A. De, Author
Papitto, A., Author
Stella, L., Author
Tiengo, A., Author
Zampieri, L., Author
Bachetti, M., Author
Brightman, M., Author
Casella, P., Author
D’Agostino, D., Author
Dall’Osso, S., Author
Earnshaw, H. P., Author
Fürst, F., Author
Haberl, F.1, Author              
Harrison, F. A., Author
Mapelli, M., AuthorMarelli, M., AuthorMiddleton, M., AuthorPinto, C., AuthorRoberts, T. P., AuthorSalvaterra, R., AuthorTurolla, R., AuthorWalton, D. J., AuthorWolter, A., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

Content

show
hide
Free keywords: -
 Abstract: We discovered 2.8 s pulsations in the X-ray emission of the ultraluminous X-ray source (ULX) M51 ULX-7 within the UNSEeN project, which was designed to hunt for new pulsating ULXs (PULXs) with XMM-Newton. The pulse shape is sinusoidal, and large variations of its amplitude were observed even within single exposures (pulsed fraction from less than 5% to 20%). Source M51 ULX-7 is variable, generally observed at an X-ray luminosity between 1039 and 1040 erg s−1, located in the outskirts of the spiral galaxy M51a at a distance of 8.6 Mpc. According to our analysis, the X-ray pulsar orbits in a 2-d binary with a projected semi-major axis aXsini≃ 28 lt-s. For a neutron star (NS) of 1.4 M, this implies a lower limit on the companion mass of 8 M, placing the system hosting M51 ULX-7 in the high-mass X-ray binary class. The barycentric pulse period decreased by ≃0.4 ms in the 31 d spanned by our May -- June 2018 observations, corresponding to a spin-up rate P˙≃−1.5×10−10s s−1. In an archival 2005 XMM-Newton exposure, we measured a spin period of ∼3.3 s, indicating a secular spin-up of P˙sec≃−10−9 s s−1, a value in the range of other known PULXs. Our findings suggest that the system consists of an OB giant and a moderately magnetic (dipole field component in the range 1012 G ≲Bdip≲1013G) accreting NS with weakly beamed emission (1/12≲b≲1/4).

Details

show
hide
Language(s):
 Dates: 2020-05-26
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ab8a44
Other: LOCALID: 3244987
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Astrophysical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 895 (1) Sequence Number: 60 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3