Milky Way demographics with the VVV survey: IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk

Javier Alonso-García, Roberto K. Saito, Maren Hempel, Dante Minniti, Joyce Pullen, Márcio Catelan, Rodrigo Contreras Ramos, Nicholas J.G. Cross, Oscar A. Gonzalez, Philip W. Lucas, Tali Palma, Elena Valenti, Manuela Zoccali

Resultado de la investigación: Article

1 Cita (Scopus)

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 originalEnglish
Número de artículo33432
PublicaciónAstronomy and Astrophysics
Volumen619
DOI
EstadoPublished - 1 nov 2018

Huella dactilar

galactic bulge
point spread functions
photometry
infrared filters
catalogs
stars
near infrared
galaxies
filter
crowding
qualitative analysis
color-magnitude diagram
European Southern Observatory
field of view
extinction
diagram
wavelength
high resolution
wavelengths

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

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. / Milky Way demographics with the VVV survey : IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk. En: Astronomy and Astrophysics. 2018 ; Vol. 619.
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title = "Milky Way demographics with the VVV survey: IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk",
abstract = "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 V{\'i}a L{\'a}ctea (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.",
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author = "Javier Alonso-Garc{\'i}a and Saito, {Roberto K.} and Maren Hempel and Dante Minniti and Joyce Pullen and M{\'a}rcio Catelan and Ramos, {Rodrigo Contreras} and Cross, {Nicholas J.G.} and Gonzalez, {Oscar A.} and Lucas, {Philip W.} and Tali Palma and Elena Valenti and Manuela Zoccali",
year = "2018",
month = "11",
day = "1",
doi = "10.1051/0004-6361/201833432",
language = "English",
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Alonso-García, J, Saito, RK, Hempel, M, Minniti, D, Pullen, J, Catelan, M, Ramos, RC, Cross, NJG, Gonzalez, OA, Lucas, PW, Palma, T, Valenti, E & Zoccali, M 2018, 'Milky Way demographics with the VVV survey: IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk', Astronomy and Astrophysics, vol. 619, 33432. https://doi.org/10.1051/0004-6361/201833432

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

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