The H α star formation main sequence in cluster and field galaxies at z ∼ 1.6

Author:

Nantais Julie1ORCID,Wilson Gillian2,Muzzin Adam3,Old Lyndsay J4,Demarco Ricardo5,Cerulo Pierluigi5,Balogh Michael67,Rudnick Gregory8,Chan Jeffrey2ORCID,Cooper M C9,Forrest Ben2,Hayden Brian1011,Lidman Chris1213,Noble Allison14,Perlmutter Saul1011,Rhea Carter15ORCID,Surace Jason16,van der Burg Remco17,van Kampen Eelco17

Affiliation:

1. Departamento de Ciencias Físicas, Universidad Andrés Bello, Fernandez Concha 700, Las Condes, RM 7591538, Chile

2. Department of Physics and Astronomy, University of California at Riverside, 900 University Avenue, Riverside, CA 92521, USA

3. Department of Physics and Astronomy, York University, 7400 Keele St, Toronto, Ontario MJ3 1P3, Canada

4. European Space Agency, European Space Astronomy Center, Villanueva de la Cañada, E-28692 Madrid, Spain

5. Departamento de Astronomía, Universidad de Concepción, Concepción, Avenida Esteban Iturra s/n Casilla 160-C, Biobío 4070386, Chile

6. Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

7. Waterloo Centre for Astrophysics, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

8. Department of Physics and Astronomy, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045, USA

9. Department of Physics and Astronomy, University of California at Irvine, 4129 Frederick Reines Hall, Irvine, CA 92697, USA

10. Physics Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

11. Department of Physics, University of California Berkeley, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300, USA

12. Research School of Astronomy and Astrophysics, Australian National University, ACT 2611, Canberra, Australia

13. Centre for Gravitational Astrophysics, College of Science, The Australian National University, ACT 2601, Australia

14. School of Earth and Space Exploration, Arizona State University Tempe, AZ 85287, USA

15. Groupe d’Astronomie et Astrophysique, Université de Montreal, Montreal, Québec, H3C 3J7, Canada

16. Infrared Processing and Analysis Center, Pasadena, California, 91125 USA

17. European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748 Garching, Germany

Abstract

ABSTRACT We calculate H α-based star formation rates and determine the star formation rate–stellar mass relation for members of three Spitzer Adaptation of the Red-Sequence Cluster Survey (SpARCS) clusters at z ∼ 1.6 and serendipitously identified field galaxies at similar redshifts to the clusters. We find similar star formation rates in cluster and field galaxies throughout our range of stellar masses. The results are comparable to those seen in other clusters at similar redshifts, and consistent with our previous photometric evidence for little quenching activity in clusters. One possible explanation for our results is that galaxies in our z ∼ 1.6 clusters have been accreted too recently to show signs of environmental quenching. It is also possible that the clusters are not yet dynamically mature enough to produce important environmental quenching effects shown to be important at low redshift, such as ram-pressure stripping or harassment.

Funder

Centro de Astrofísica y Tecnologías Afines

Alberta Livestock and Meat Agency

Comisión Nacional de Investigación Científica y Tecnológica

National Science Foundation

National Aeronautics and Space Administration

Space Telescope Science Institute

European Space Agency

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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