Cargando…
The Point-Agape survey: No Need for Machos in M31 ?
We have carried out a survey of the Andromeda galaxy for unresolved microlensing (pixel lensing). We present a subset of four short timescale microlensing candidates with high ratio of signal to noise, by imposing severe selection criteria: the source flux variation exceeds the flux of a R=21 magnit...
| Autores principales: | , , , , , , , , , , , , , , |
|---|---|
| Lenguaje: | eng |
| Publicado: |
2002
|
| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1051/0004-6361:20030519 http://cds.cern.ch/record/565686 |
| _version_ | 1780899155653165056 |
|---|---|
| author | Paulin-Henriksson, S. Baillon, P. Bouquet, A. Carr, Bernard J. Creze, M. Evans, N.W. Giraud-Heraud, Y. Gould, A. Hewett, Paul C. Kaplan, J. Kerins, E. Du, Y.Le Melchior, A.L. Smartt, S.J. Valls-Gabaud, D. |
| author_facet | Paulin-Henriksson, S. Baillon, P. Bouquet, A. Carr, Bernard J. Creze, M. Evans, N.W. Giraud-Heraud, Y. Gould, A. Hewett, Paul C. Kaplan, J. Kerins, E. Du, Y.Le Melchior, A.L. Smartt, S.J. Valls-Gabaud, D. |
| author_sort | Paulin-Henriksson, S. |
| collection | CERN |
| description | We have carried out a survey of the Andromeda galaxy for unresolved microlensing (pixel lensing). We present a subset of four short timescale microlensing candidates with high ratio of signal to noise, by imposing severe selection criteria: the source flux variation exceeds the flux of a R=21 magnitude star and the full-width half-maximum timescale is less than 25 days. One event, which lies projected on the M31 bulge is probably due to a bulge stellar lens. The other three candidates can be explained either by stars in M31 and M32, or by massive compact halo objects (MACHOs). As all four events can reasonably be attributed to stellar lenses, we conclude that our subsample of high ratio signal-to-noise candidates does not require the presence of MACHOs. |
| id | cern-565686 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2002 |
| record_format | invenio |
| spelling | cern-5656862019-09-30T06:29:59Zdoi:10.1051/0004-6361:20030519http://cds.cern.ch/record/565686engPaulin-Henriksson, S.Baillon, P.Bouquet, A.Carr, Bernard J.Creze, M.Evans, N.W.Giraud-Heraud, Y.Gould, A.Hewett, Paul C.Kaplan, J.Kerins, E.Du, Y.LeMelchior, A.L.Smartt, S.J.Valls-Gabaud, D.The Point-Agape survey: No Need for Machos in M31 ?Astrophysics and AstronomyWe have carried out a survey of the Andromeda galaxy for unresolved microlensing (pixel lensing). We present a subset of four short timescale microlensing candidates with high ratio of signal to noise, by imposing severe selection criteria: the source flux variation exceeds the flux of a R=21 magnitude star and the full-width half-maximum timescale is less than 25 days. One event, which lies projected on the M31 bulge is probably due to a bulge stellar lens. The other three candidates can be explained either by stars in M31 and M32, or by massive compact halo objects (MACHOs). As all four events can reasonably be attributed to stellar lenses, we conclude that our subsample of high ratio signal-to-noise candidates does not require the presence of MACHOs.astro-ph/0207025oai:cds.cern.ch:5656862002-07-01 |
| spellingShingle | Astrophysics and Astronomy Paulin-Henriksson, S. Baillon, P. Bouquet, A. Carr, Bernard J. Creze, M. Evans, N.W. Giraud-Heraud, Y. Gould, A. Hewett, Paul C. Kaplan, J. Kerins, E. Du, Y.Le Melchior, A.L. Smartt, S.J. Valls-Gabaud, D. The Point-Agape survey: No Need for Machos in M31 ? |
| title | The Point-Agape survey: No Need for Machos in M31 ? |
| title_full | The Point-Agape survey: No Need for Machos in M31 ? |
| title_fullStr | The Point-Agape survey: No Need for Machos in M31 ? |
| title_full_unstemmed | The Point-Agape survey: No Need for Machos in M31 ? |
| title_short | The Point-Agape survey: No Need for Machos in M31 ? |
| title_sort | point-agape survey: no need for machos in m31 ? |
| topic | Astrophysics and Astronomy |
| url | https://dx.doi.org/10.1051/0004-6361:20030519 http://cds.cern.ch/record/565686 |
| work_keys_str_mv | AT paulinhenrikssons thepointagapesurveynoneedformachosinm31 AT baillonp thepointagapesurveynoneedformachosinm31 AT bouqueta thepointagapesurveynoneedformachosinm31 AT carrbernardj thepointagapesurveynoneedformachosinm31 AT crezem thepointagapesurveynoneedformachosinm31 AT evansnw thepointagapesurveynoneedformachosinm31 AT giraudheraudy thepointagapesurveynoneedformachosinm31 AT goulda thepointagapesurveynoneedformachosinm31 AT hewettpaulc thepointagapesurveynoneedformachosinm31 AT kaplanj thepointagapesurveynoneedformachosinm31 AT kerinse thepointagapesurveynoneedformachosinm31 AT duyle thepointagapesurveynoneedformachosinm31 AT melchioral thepointagapesurveynoneedformachosinm31 AT smarttsj thepointagapesurveynoneedformachosinm31 AT vallsgabaudd thepointagapesurveynoneedformachosinm31 AT paulinhenrikssons pointagapesurveynoneedformachosinm31 AT baillonp pointagapesurveynoneedformachosinm31 AT bouqueta pointagapesurveynoneedformachosinm31 AT carrbernardj pointagapesurveynoneedformachosinm31 AT crezem pointagapesurveynoneedformachosinm31 AT evansnw pointagapesurveynoneedformachosinm31 AT giraudheraudy pointagapesurveynoneedformachosinm31 AT goulda pointagapesurveynoneedformachosinm31 AT hewettpaulc pointagapesurveynoneedformachosinm31 AT kaplanj pointagapesurveynoneedformachosinm31 AT kerinse pointagapesurveynoneedformachosinm31 AT duyle pointagapesurveynoneedformachosinm31 AT melchioral pointagapesurveynoneedformachosinm31 AT smarttsj pointagapesurveynoneedformachosinm31 AT vallsgabaudd pointagapesurveynoneedformachosinm31 |