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:
CreatorsEmailORCIDORCID Put Code
Gomez-Guijarro, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Toft, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Karim, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magnelli, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magdis, G. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jimenez-Andrade, E. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Capak, P. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fraternali, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fujimoto, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Riechers, D. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schinnerer, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smolcic, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aravena, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bertoldi, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cortzen, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hasinger, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hu, E. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jones, G. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koekemoer, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McCracken, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Michalowski, M. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Navarrete, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Povic, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Puglisi, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Romano-Diaz, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sheth, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Silverman, J. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Staguhn, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Steinhardt, C. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stockmann, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tanaka, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valentino, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Kampen, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zirm, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
HUBBLE-SPACE-TELESCOPE; COSMOLOGY LEGACY SURVEY; FAR-INFRARED PROPERTIES; DEEP FIELD-SOUTH; C II EMISSION; FORMING GALAXIES; HIGH-REDSHIFT; PHOTOMETRIC REDSHIFTS; ELLIPTIC GALAXIES; FORMATION HISTORYMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/19160

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