%0 Generic %1 shivaei2015mosdef %A Shivaei, Irene %A Reddy, Naveen A. %A Shapley, Alice E. %A Kriek, Mariska %A Siana, Brian %A Mobasher, Bahram %A Coil, Alison L. %A Freeman, William R. %A Sanders, Ryan %A Price, Sedona H. %A de Groot, Laura %A Azadi, Mojegan %D 2015 %K Halpha dust highz observations sfr %T The MOSDEF Survey: Dissecting the star-formation rate vs. stellar mass relation using H$\alpha$ and H$\beta$ emission lines at z ~ 2 %U http://arxiv.org/abs/1507.03017 %X We present results on the SFR-$M_*$ relation (i.e., the "main sequence") among star-forming galaxies at $1.37z łeq2.61$ using the MOSFIRE Deep Evolution Field (MOSDEF) survey. Based on a sample of 261 star-forming galaxies with observations of H$\alpha$ and H$\beta$ emission lines, we have estimated robust dust-corrected instantaneous star-formation rates (SFRs) over a large dynamic range in stellar mass ($10^9.0-10^11.5M_ødot$). We find a tight correlation between SFR(H$\alpha$) and $M_*$ with an intrinsic scatter of 0.36 dex, 0.05 dex larger than that of UV-based SFRs. This increased scatter is consistent with predictions from numerical simulations of 0.03 - 0.1 dex, and is attributed to H$\alpha$ more accurately tracing SFR variations. The slope of the $łog(SFR)-łog(M_*)$ relation, using SFR(H$\alpha$), at $1.4< z<2.6$ and over the stellar mass range of $10^9.5$ to $10^11.5M_ødot$ is $0.650.09$. We find that different assumptions for the dust correction, such as using the stellar $E(B-V)$ with a Calzetti et al. (2000) attenuation curve, as well as the sample biases against red and dusty star-forming galaxies at large masses, could yield steeper slopes. Moreover, not correcting the Balmer emission line fluxes for the underlying Balmer absorption results in overestimating the dust extinction of H$\alpha$ and SFR(H$\alpha$) at the high-mass end by 2.1 (2.5) at $10^10.6 M_ødot$ ($10^11.1 M_ødot$) and artificially increases the slope of the main-sequence. The shallower main-sequence slope found here compared to that of galaxy evolution simulations may be indicative of different feedback processes governing the low- and/or high-mass end of the main sequence.

@misc{shivaei2015mosdef, abstract = {We present results on the SFR-$M_*$ relation (i.e., the "main sequence") among star-forming galaxies at $1.37\leq z \leq2.61$ using the MOSFIRE Deep Evolution Field (MOSDEF) survey. Based on a sample of 261 star-forming galaxies with observations of H$\alpha$ and H$\beta$ emission lines, we have estimated robust dust-corrected instantaneous star-formation rates (SFRs) over a large dynamic range in stellar mass ($\sim 10^{9.0}-10^{11.5}M_\odot$). We find a tight correlation between SFR(H$\alpha$) and $M_*$ with an intrinsic scatter of 0.36 dex, 0.05 dex larger than that of UV-based SFRs. This increased scatter is consistent with predictions from numerical simulations of 0.03 - 0.1 dex, and is attributed to H$\alpha$ more accurately tracing SFR variations. The slope of the $\log(\text{SFR})-\log(M_*)$ relation, using SFR(H$\alpha$), at $1.4< z<2.6$ and over the stellar mass range of $10^{9.5}$ to $10^{11.5}M_\odot$ is $0.65\pm 0.09$. We find that different assumptions for the dust correction, such as using the stellar $E(B-V)$ with a Calzetti et al. (2000) attenuation curve, as well as the sample biases against red and dusty star-forming galaxies at large masses, could yield steeper slopes. Moreover, not correcting the Balmer emission line fluxes for the underlying Balmer absorption results in overestimating the dust extinction of H$\alpha$ and SFR(H$\alpha$) at the high-mass end by 2.1 (2.5) at $10^{10.6} M_\odot$ ($10^{11.1} M_\odot$) and artificially increases the slope of the main-sequence. The shallower main-sequence slope found here compared to that of galaxy evolution simulations may be indicative of different feedback processes governing the low- and/or high-mass end of the main sequence.}, added-at = {2015-07-14T10:01:17.000+0200}, author = {Shivaei, Irene and Reddy, Naveen A. and Shapley, Alice E. and Kriek, Mariska and Siana, Brian and Mobasher, Bahram and Coil, Alison L. and Freeman, William R. and Sanders, Ryan and Price, Sedona H. and de Groot, Laura and Azadi, Mojegan}, biburl = {https://www.bibsonomy.org/bibtex/2fcbcb58b0e88e512a9bf192967c889e7/miki}, description = {[1507.03017] The MOSDEF Survey: Dissecting the star-formation rate vs. stellar mass relation using H$\alpha$ and H$\beta$ emission lines at z ~ 2}, interhash = {7ae889a0d1c620f8b05ad42870b59c7d}, intrahash = {fcbcb58b0e88e512a9bf192967c889e7}, keywords = {Halpha dust highz observations sfr}, note = {cite arxiv:1507.03017Comment: 12 pages, 8 figures, 2 tables, submitted to ApJ}, timestamp = {2015-07-14T10:01:17.000+0200}, title = {The MOSDEF Survey: Dissecting the star-formation rate vs. stellar mass relation using H$\alpha$ and H$\beta$ emission lines at z ~ 2}, url = {http://arxiv.org/abs/1507.03017}, year = 2015 }