Resumen
Context. The inner regions of the Galaxy are severely affected by extinction, which limits our capability to study the stellar populations present there. The Vista Variables in the Vía Láctea (VVV) ESO Public Survey has observed this zone at near-infrared wavelengths where reddening is highly diminished. Aims. By exploiting the high resolution and wide field-of-view of the VVV images we aim to produce a deep, homogeneous, and highly complete database of sources that cover the innermost regions of our Galaxy. Methods. To better deal with the high crowding in the surveyed areas, we have used point spread function (PSF)-fitting techniques to obtain a new photometry of the VVV images, in the ZY JHKs near-infrared filters available. Results. Our final catalogs contain close to one billion sources, with precise photometry in up to five near-infrared filters, and they are already being used to provide an unprecedented view of the inner Galactic stellar populations. We make these catalogs publicly available to the community. Our catalogs allow us to build the VVV giga-CMD, a series of color-magnitude diagrams of the inner regions of the Milky Way presented as supplementary videos. We provide a qualitative analysis of some representative CMDs of the inner regions of the Galaxy, and briefly mention some of the studies we have developed with this new dataset so far.
| Idioma original | English |
|---|---|
| Número de artículo | 33432 |
| Publicación | Astronomy and Astrophysics |
| Volumen | 619 |
| DOI | |
| Estado | Published - 1 nov 2018 |
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ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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Milky Way demographics with the VVV survey : IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk. / Alonso-García, Javier; Saito, Roberto K.; Hempel, Maren; Minniti, Dante; Pullen, Joyce; Catelan, Márcio; Ramos, Rodrigo Contreras; Cross, Nicholas J.G.; Gonzalez, Oscar A.; Lucas, Philip W.; Palma, Tali; Valenti, Elena; Zoccali, Manuela.
En: Astronomy and Astrophysics, Vol. 619, 33432, 01.11.2018.Resultado de la investigación: Article
TY - JOUR
T1 - Milky Way demographics with the VVV survey
T2 - IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk
AU - Alonso-García, Javier
AU - Saito, Roberto K.
AU - Hempel, Maren
AU - Minniti, Dante
AU - Pullen, Joyce
AU - Catelan, Márcio
AU - Ramos, Rodrigo Contreras
AU - Cross, Nicholas J.G.
AU - Gonzalez, Oscar A.
AU - Lucas, Philip W.
AU - Palma, Tali
AU - Valenti, Elena
AU - Zoccali, Manuela
PY - 2018/11/1
Y1 - 2018/11/1
N2 - Context. The inner regions of the Galaxy are severely affected by extinction, which limits our capability to study the stellar populations present there. The Vista Variables in the Vía Láctea (VVV) ESO Public Survey has observed this zone at near-infrared wavelengths where reddening is highly diminished. Aims. By exploiting the high resolution and wide field-of-view of the VVV images we aim to produce a deep, homogeneous, and highly complete database of sources that cover the innermost regions of our Galaxy. Methods. To better deal with the high crowding in the surveyed areas, we have used point spread function (PSF)-fitting techniques to obtain a new photometry of the VVV images, in the ZY JHKs near-infrared filters available. Results. Our final catalogs contain close to one billion sources, with precise photometry in up to five near-infrared filters, and they are already being used to provide an unprecedented view of the inner Galactic stellar populations. We make these catalogs publicly available to the community. Our catalogs allow us to build the VVV giga-CMD, a series of color-magnitude diagrams of the inner regions of the Milky Way presented as supplementary videos. We provide a qualitative analysis of some representative CMDs of the inner regions of the Galaxy, and briefly mention some of the studies we have developed with this new dataset so far.
AB - Context. The inner regions of the Galaxy are severely affected by extinction, which limits our capability to study the stellar populations present there. The Vista Variables in the Vía Láctea (VVV) ESO Public Survey has observed this zone at near-infrared wavelengths where reddening is highly diminished. Aims. By exploiting the high resolution and wide field-of-view of the VVV images we aim to produce a deep, homogeneous, and highly complete database of sources that cover the innermost regions of our Galaxy. Methods. To better deal with the high crowding in the surveyed areas, we have used point spread function (PSF)-fitting techniques to obtain a new photometry of the VVV images, in the ZY JHKs near-infrared filters available. Results. Our final catalogs contain close to one billion sources, with precise photometry in up to five near-infrared filters, and they are already being used to provide an unprecedented view of the inner Galactic stellar populations. We make these catalogs publicly available to the community. Our catalogs allow us to build the VVV giga-CMD, a series of color-magnitude diagrams of the inner regions of the Milky Way presented as supplementary videos. We provide a qualitative analysis of some representative CMDs of the inner regions of the Galaxy, and briefly mention some of the studies we have developed with this new dataset so far.
KW - Catalogs
KW - Galaxy: bulge
KW - Galaxy: disk
KW - Galaxy: stellar content
KW - Surveys
KW - Techniques: photometric
UR - http://www.scopus.com/inward/record.url?scp=85056090200&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201833432
DO - 10.1051/0004-6361/201833432
M3 - Article
AN - SCOPUS:85056090200
VL - 619
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - 33432
ER -