Quick Search:

uzh logo
Browse by:

Zurich Open Repository and Archive

Maintenance: Tuesday, July the 26th 2016, 07:00-10:00

ZORA's new graphical user interface will be relaunched (For further infos watch out slideshow ZORA: Neues Look & Feel). There will be short interrupts on ZORA Service between 07:00am and 10:00 am. Please be patient.

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-46941

Calchi Novati, S; Dall'Ora, M; Gould, A; Bozza, V; Bruni, I; De Paolis, F; Dominik, M; Gualandi, R; Ingrosso, G; Jetzer, P; Mancini, L; Nucita, A; Scarpetta, G; Sereno, M; Strafella, F (2010). M31 pixel lensing event OAB-N2: a study of the lens proper motion. Astrophysical Journal, 717(2):987.

Accepted Version
PDF (Accepted manuscript, Version 2)
View at publisher
Accepted Version
PDF (Accepted manuscript, Version 1)


We present an updated analysis of the M31 pixel lensing candidate event OAB-N2 previously reported in Calchi Novati et al. (2009). Here we take advantage of new data both astrometric and photometric. Astrometry: using archival 4m-KPNO and HST/WFPC2 data we perform a detailed analysis on the event source whose result, although not fully conclusive on the source magnitude determination, is confirmed by the following light curve photometry analysis. Photometry: first, unpublished WeCAPP data allows us to confirm OAB-N2, previously reported only as a viable candidate, as a well constrained pixel lensing event. Second, this photometry enables a detailed analysis in the event parameter space including the effects due to finite source size. The combined results of these analyses allow us to put a strong lower limit on the lens proper motion. This outcome favors the MACHO lensing hypothesis over self lensing for this individual event and points the way toward distinguishing between the MACHO and self-lensing hypotheses from larger data sets.


11 citations in Web of Science®
12 citations in Scopus®
Google Scholar™



70 downloads since deposited on 02 Mar 2011
17 downloads since 12 months

Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Deposited On:02 Mar 2011 08:19
Last Modified:05 Apr 2016 14:51
Publisher:Institute of Physics Publishing
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:10.1088/0004-637X/717/2/987
Related URLs:http://arxiv.org/abs/1004.3865

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page