Volume 622, February 2019
|Number of page(s)||13|
|Published online||21 February 2019|
J-PLUS: Measuring Hα emission line fluxes in the nearby universe
Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Plaza San Juan 1, 44001 Teruel, Spain
2 Centro de Estudios de Física del Cosmos de Aragón (CEFCA), Unidad Asociada al CSIC, Plaza San Juan 1, 44001 Teruel, Spain
3 Observatório Nacional/MCTIC, Rua Gen. José Cristino, 77, 20921-400 Rio de Janeiro, Brazil
4 Departamento de Astronomia, Instituto de Física, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
5 Universidade de Sao Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Rua do Matao, 1226, Sao Paulo 05508-900, Brazil
6 Department of Astronomy, University of Michigan, Ann Arbor, MI 48109-1107, USA
7 PITT PACC, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
8 IAA (CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain
9 Universidade Federal de Sergipe, Departamento de Física, Av. Marechal Rondon, s/n, 49000-000 Sao Cristóvao, SE, Brazil
10 X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
11 Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
12 Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
13 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
14 Observatório do Valongo, Universidade Federal do Rio de Janeiro, Ladeira Pedro Antonio 43, 20080-090 Rio de Janeiro, Brazil
15 European Space Astronomy Centre (ESAC)/ESA, PO Box 78, 28690 Villanueva de la Canada Madrid, Spain
Accepted: 8 June 2018
In this paper we aim to validate a methodology designed to obtain Hα emission line fluxes from J-PLUS photometric data. J-PLUS is a multi narrow-band filter survey carried out with the 2 deg2 field of view T80Cam camera, mounted on the JAST/T80 telescope in the OAJ, Teruel, Spain. The information of the twelve J-PLUS bands, including the J0660 narrow-band filter located at rest-frame Hα, is used over the first 42 deg2 observed to retrieve de-reddened and [NII] decontaminated Hα emission line fluxes of 46 star-forming regions with previous SDSS and/or CALIFA spectroscopic information. The agreement between the J-PLUS Hα fluxes and those obtained with spectroscopic data is remarkable, finding a median comparison ratio with a scatter of . This demonstrates that it is possible to retrieve reliable Hα emission line fluxes from J-PLUS photometric data. With an expected area of thousands of square degrees upon completion, the J-PLUS dataset will allow the study of several star formation science cases in the nearby universe, as the spatially resolved star formation rate of nearby galaxies at z ≤ 0.015, and how it is influenced by the environment, morphology, stellar mass, and nuclear activity. As an illustrative example, the close pair of interacting galaxies NGC 3994 and NGC 3995 is analysed, finding an enhancement of the star formation rate not only in the centre, but also in outer parts of the disk of NGC 3994.
Key words: methods: data analysis / techniques: photometric / galaxies: star formation
© ESO 2019
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