Universität zu Köln

Gomez-Guijarro, C., Toft, S., Karim, A., Magnelli, B., Magdis, G. E., Jimenez-Andrade, E. F., Capak, P. L., Fraternali, F., Fujimoto, S., Riechers, D. A., Schinnerer, E., Smolcic, V., Aravena, M., Bertoldi, F., Cortzen, I., Hasinger, G., Hu, E. M., Jones, G. C., Koekemoer, A. M., Lee, N., McCracken, H. J., Michalowski, M. J., Navarrete, F., Povic, M., Puglisi, A., Romano-Diaz, E., Sheth, K., Silverman, J. D., Staguhn, J., Steinhardt, C. L., Stockmann, M., Tanaka, M., Valentino, F., van Kampen, E. and Zirm, A. (2018). Starburst to Quiescent from HST/ALMA: Stars and Dust Unveil Minor Mergers in Submillimeter Galaxies at z similar to 4.5. Astrophys. J., 856 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

Dust-enshrouded, starbursting, submillimeter galaxies (SMGs) at z >= 3 have been proposed as progenitors of z >= 2 compact quiescent galaxies (cQGs). To test this connection, we present a detailed spatially resolved study of the stars, dust, and stellar mass in a sample of six submillimeter-bright starburst galaxies at z similar to 4.5. The stellar UV emission probed by HST is extended and irregular and shows evidence of multiple components. Informed by HST, we deblend Spitzer/IRAC data at rest-frame optical, finding that the systems are undergoing minor mergers with a typical stellar mass ratio of 1:6.5. The FIR dust continuum emission traced by ALMA locates the bulk of star formation in extremely compact regions (median r(e) = 0.70 +/- 0.29 kpc), and it is in all cases associated with the most massive component of the mergers (median log(M-*/M-circle dot)= 10.49 +/- 0.32). We compare spatially resolved UV slope (beta) maps with the FIR dust continuum to study the infrared excess (IRX = L-IR/L-UV)-beta relation. The SMGs display systematically higher IRX values than expected from the nominal trend, demonstrating that the FIR and UV emissions are spatially disconnected. Finally, we show that the SMGs fall on the mass-size plane at smaller stellar masses and sizes than the cQGs at z = 2. Taking into account the expected evolution in stellar mass and size between z = 4.5 and z = 2 due to the ongoing starburst and mergers with minor companions, this is in agreement with a direct evolutionary connection between the two populations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gomez-Guijarro, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Toft, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karim, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magnelli, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magdis, G. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jimenez-Andrade, E. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Capak, P. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fraternali, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fujimoto, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Riechers, D. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schinnerer, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smolcic, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aravena, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bertoldi, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cortzen, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hasinger, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hu, E. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jones, G. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koekemoer, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED McCracken, H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michalowski, M. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Navarrete, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Povic, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Puglisi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Romano-Diaz, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sheth, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Silverman, J. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Staguhn, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Steinhardt, C. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stockmann, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanaka, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Valentino, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Kampen, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zirm, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-191609
DOI:	10.3847/1538-4357/aab206
Journal or Publication Title:	Astrophys. J.
Volume:	856
Number:	2
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HUBBLE-SPACE-TELESCOPE; COSMOLOGY LEGACY SURVEY; FAR-INFRARED PROPERTIES; DEEP FIELD-SOUTH; C II EMISSION; FORMING GALAXIES; HIGH-REDSHIFT; PHOTOMETRIC REDSHIFTS; ELLIPTIC GALAXIES; FORMATION HISTORY Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19160