\relax \@writefile{toc}{\contentsline {section}{\numberline {1}Introduction}{2}} \newlabel{sintro}{{1}{2}} \@writefile{toc}{\contentsline {section}{\numberline {2}Sample Properties}{4}} \newlabel{sdata}{{2}{4}} \@writefile{toc}{\contentsline {subsection}{\numberline {2.1}OSUBSGS}{4}} \newlabel{sdataosu}{{2.1}{4}} \newlabel{vmax}{{1}{5}} \newlabel{dmax}{{2}{5}} \@writefile{toc}{\contentsline {subsection}{\numberline {2.2}Stellar Masses}{5}} \newlabel{stellmass}{{2.2}{5}} \newlabel{masseq}{{3}{6}} \newlabel{vlumeq}{{4}{6}} \@writefile{toc}{\contentsline {section}{\numberline {3}Method and Analysis}{6}} \newlabel{sanaly}{{3}{6}} \@writefile{toc}{\contentsline {subsection}{\numberline {3.1}Image Preparation}{7}} \newlabel{sdecom1}{{3.1}{7}} \@writefile{toc}{\contentsline {subsection}{\numberline {3.2}Decomposition Steps}{8}} \newlabel{sdecom2}{{3.2}{8}} \@writefile{toc}{\contentsline {subsection}{\numberline {3.3}Choosing the Best Fit Between Stage 2 and Stage 3}{10}} \newlabel{schoice23}{{3.3}{10}} \@writefile{toc}{\contentsline {section}{\numberline {4}Extra Tests to Verify Correctness of Fits}{11}} \newlabel{stests}{{4}{11}} \@writefile{toc}{\contentsline {subsection}{\numberline {4.1}Varying $b/a$ as a Function of Radius}{11}} \newlabel{stest1}{{4.1}{11}} \@writefile{toc}{\contentsline {subsection}{\numberline {4.2}Fitting Artificially Simulated Images}{12}} \newlabel{sartif}{{4.2}{12}} \newlabel{nse}{{5}{12}} \@writefile{toc}{\contentsline {subsection}{\numberline {4.3}Using $1D$ Decomposition To Generate Guesses for Bulge Parameters}{12}} \newlabel{s1dcut}{{4.3}{12}} \@writefile{toc}{\contentsline {section}{\numberline {5}Results and Discussion}{13}} \newlabel{sresult}{{5}{13}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.1}Impact of Bars in $2D$ Decomposition }{13}} \newlabel{sbar1}{{5.1}{13}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.2}Mass in Bulges, Disks, and Bars}{14}} \newlabel{smass}{{5.2}{14}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.3}Distribution of Bulge Index and $B/T$}{15}} \newlabel{sbulgenbt}{{5.3}{15}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.4}Comparison With Independent Decompositions}{16}} \newlabel{scomp1}{{5.4}{16}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.5}Comparison of $B/T$ to Hierarchical Models of Galaxy Evolution}{17}} \newlabel{smodel1}{{5.5}{17}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.6}Revisiting Bulge Formation in Hierarchical Models of Galaxy Evolution}{19}} \newlabel{smodel2}{{5.6}{19}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.7}Bar Strength}{20}} \newlabel{sbar2}{{5.7}{20}} \@writefile{toc}{\contentsline {subsection}{\numberline {5.8}Bar Fraction as Function of $B/T$ and Bulge Index}{21}} \newlabel{sbar3}{{5.8}{21}} \@writefile{toc}{\contentsline {section}{\numberline {6}Summary}{22}} \newlabel{ssumm}{{6}{22}} \bibcite{2006MNRAS.371....2A}{{1}{2006}{{Allen 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\bibcite{2004ApJ...606...32R}{{63}{2004}{{Robertson et al.}}{{}}} \bibcite{2006ApJ...645..986R}{{64}{2006}{{Robertson et al.}}{{}}} \bibcite{2008ApJ...675.1141S}{{65}{2008}{{Sheth et al.}}{{}}} \bibcite{1998ASPC..145..108S}{{66}{1998}{{Simard}}{{}}} \bibcite{2002ApJS..142....1S}{{67}{2002}{{Simard et al.}}{{}}} \bibcite{1999MNRAS.305....1S}{{68}{1999}{{Somerville \& Kolatt}}{{}}} \bibcite{2005ApJ...622L...9S}{{69}{2005}{{Springel \& Hernquist}}{{}}} \bibcite{2005MNRAS.361..776S}{{70}{2005}{{Springel et al.}}{{}}} \bibcite{2002NewA....7..155S}{{71}{2002}{{Steinmetz \& Navarro}}{{}}} \bibcite{2006A&A...455..773V}{{72}{2006}{{V{\'e}ron-Cetty \& V{\'e}ron}}{{}}} \bibcite{1999AJ....117.1219W}{{73}{1999}{{Wadadekar et al.}}{{}}} \bibcite{2007MNRAS.375..213W}{{74}{2007}{{Warren et al.}}{{}}} \bibcite{1985MNRAS.213..451W}{{75}{1985}{{Weinberg}}{{}}} \@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces OSUBSGS Galaxies (N=146) }}{29}} \newlabel{tosu}{{1}{29}} \@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces OSUBSGS Galaxies (N=146) }}{30}} \@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces OSUBSGS Galaxies (N=146) }}{31}} \@writefile{lot}{\contentsline {table}{\numberline {1}{\ignorespaces OSUBSGS Galaxies (N=146) }}{32}} \@writefile{lot}{\contentsline {table}{\numberline {2}{\ignorespaces Structural Parameters of 146 OSUBSGS Galaxies }}{33}} \newlabel{tdecomp}{{2}{33}} \@writefile{lot}{\contentsline {table}{\numberline {2}{\ignorespaces Structural Parameters of 146 OSUBSGS Galaxies }}{34}} \@writefile{lot}{\contentsline {table}{\numberline {2}{\ignorespaces Structural Parameters of 146 OSUBSGS Galaxies }}{35}} \@writefile{lot}{\contentsline {table}{\numberline {2}{\ignorespaces Structural Parameters of 146 OSUBSGS Galaxies }}{36}} \@writefile{lot}{\contentsline {table}{\numberline {2}{\ignorespaces Structural Parameters of 146 OSUBSGS Galaxies }}{37}} \@writefile{lot}{\contentsline {table}{\numberline {3}{\ignorespaces Checking GALFIT Robustness With Different Input Guesses}}{38}} \newlabel{t1dfit}{{3}{38}} \@writefile{lof}{\contentsline {figure}{\numberline {1}{\ignorespaces The distribution of absolute $B$-band magnitudes for the OSUBSGS sample before (unshaded) and after (shaded) the cut to remove highly inclined ($i > 70^\circ $) spiral galaxies. }}{39}} \newlabel{osu_hist}{{1}{39}} \@writefile{lof}{\contentsline {figure}{\numberline {2}{\ignorespaces The distribution of Hubble types for for the OSUBSGS sample before (unshaded) and after (shaded) the cut to remove highly inclined ($i > 70^\circ $) spiral galaxies. The sample is dominated by Hubble types S0/a to Sc. }}{40}} \newlabel{osu_hubb}{{2}{40}} \@writefile{lof}{\contentsline {figure}{\numberline {3}{\ignorespaces The OSUBSGS luminosity function is compared the $B$-band Schechter luminosity function (SLF). The former is calculated as described in \S 2.1\hbox {} using equation (1\hbox {}). The parameters for the SLF are $\Phi ^*=5.488\times 10^{-3}$ Mpc$^{-3}$, $\alpha =-1.07$, and $M^*_B=-20.5$, corresponding to $H_0$=70 km/s Mpc$^{-1}$. }}{41}} \newlabel{osu_uncorr}{{3}{41}} \@writefile{lof}{\contentsline {figure}{\numberline {4}{\ignorespaces Stellar mass distribution of OSUBSGS galaxies as determined in \S 2.2\hbox {}. }}{42}} \newlabel{stellmasshist}{{4}{42}} \@writefile{lof}{\contentsline {figure}{\numberline {5}{\ignorespaces An overview of the method of decomposition. All images are subjected to Stages 1-3. Either the output of Stage 2 or Stage 3 is chosen as the best model. }}{43}} \newlabel{flowchart}{{5}{43}} \@writefile{lof}{\contentsline {figure}{\numberline {6}{\ignorespaces Complete $2D$ decomposition for NGC 4643. Note the prominent bar residuals in the residual for the Stage 1 and Stage 2 bulge-disk decomposition. This is a case where the prominent bar causes the Stage 2 bulge-disk fit to artificially extend the bulge and inflate the $B/T$. The disk fitted in Stage 2 has a low surface brightness and is very extended, well beyond the real disk: the $b/a$ and $PA$ of the fitted disk is shown as contours. Stage 3 bulge-disk-bar decomposition provides the best model. See Table 4\hbox {} for the fit parameters. }}{44}} \newlabel{ngc4643}{{6}{44}} \@writefile{lof}{\contentsline {figure}{\numberline {7}{\ignorespaces The complete $2D$ decomposition for NGC 4548. This is an extreme example where the prominent bar results in an extended bulge and inflated $B/T$ in the Stage 2 bulge-disk fit. Like NGC 4643 in Figure 6\hbox {}, the disk fitted in Stage 2 has a low surface brightness and is very extended: its $b/a$ and $PA$ are shown as contours. Stage 3 bulge-disk-bar decomposition provides the best model. See Table 5\hbox {} for the fit parameters. }}{45}} \newlabel{ngc4548}{{7}{45}} \@writefile{lof}{\contentsline {figure}{\numberline {8}{\ignorespaces This plot shows the data image, Stage 2 model, and Stage 3 model for NGC 4902. The Stage 2 bulge is too bright and is extended along the major axis of the bar ($B/T$=31.2\% and $b/a$=0.45). In Stage 3, the bulge and bar are fit with distinct components ($B/T$=6.2\%, bulge $b/a$=0.75, Bar/$T$=10.0\%, bar $b/a$=0.25). }}{46}} \newlabel{bulgedistort}{{8}{46}} \@writefile{lof}{\contentsline {figure}{\numberline {9}{\ignorespaces The data images and Stage 3 bulge-disk-bar decomposition models of NGC 5427 and NGC 7412 are shown. The Stage 3 models each distinctly show a false bar component, which is not present in the data images.The false components can be inspired by prominent spiral arms, such as those present in these galaxies. Such cases are flagged during the visual inspection of fits and the Stage 3 bulge-disk-bar decomposition is discarded in favor of the Stage 2 bulge-disk decomposition. }}{47}} \newlabel{falsebars}{{9}{47}} \@writefile{lof}{\contentsline {figure}{\numberline {10}{\ignorespaces The run of $b/a$ and $PA$ are shown from modeling the bulge of NGC 4548 with ten concentric S\'ersic profiles with fixed $r_e$ each separated by 0.75''. The mean $b/a$ and $PA$ are indicated with horizontal lines. The combined $B/T$ from the ten components is 14.5\%, in good agreement with the 13.0\% value from the fit with a single bulge of constant $b/a$. }}{48}} \newlabel{qtest}{{10}{48}} \@writefile{lof}{\contentsline {figure}{\numberline {11}{\ignorespaces An elementary test is to determine if GALFIT can recover the known parameters of artificial noisy images. Noisy images were simulated by taking parametric model images (left panels) produced by GALFIT, and adding noise and sky background (right panels). The noisy images were then fitted to see if the original known parameters can be recovered. See \S 4.2\hbox {} for details. }}{49}} \newlabel{nsemodel}{{11}{49}} \@writefile{lof}{\contentsline {figure}{\numberline {12}{\ignorespaces The top, middle, and bottom panels show stellar mass for bulges, disks, and bars, respectively, along the Hubble sequence. }}{50}} \newlabel{3p-plot2}{{12}{50}} \@writefile{lof}{\contentsline {figure}{\numberline {13}{\ignorespaces The individual and mean $B/T$ (left panels) and bulge S\'ersic index (right panels) are plotted, as a function of Hubble type and galaxy stellar mass. Barred and unbarred galaxies are shown separately. The mean $B/T$ and bulge index in barred galaxies differ systematically from unbarred galaxies, but there is a large overlap in the individual values. The error bars denote the error on the mean. The distribution of $B/T$ shows that bulges with $B/T \leq 0.2$ are pervasive and exist across the whole spectrum of S0/a to Scd. Furthermore, only a small fraction (5.5\%) of bulges have classical S\'ersic indexes ($n\ge $\nobreakspace {}4): such bulges lie primarily in S0/a to Sab,and have large $B/T > 0.2$. A large fraction (34.4\%) of bulges have \nobreakspace {}$2 0.2$. A large fraction (34.4\%) of bulges have $24$, as much as 20\% have low $n< 2.5$, while 50\% have $n < 3$. This suggests that intermediate $2