A census of star formation histories of massive galaxies at 0.6 < z < 1 from spectro-photometric modeling using Bagpipes and Prospector

We present individual star-formation histories of $\sim3000$ massive galaxies (log($\mathrm{M_*/M_{\odot}}$) > 10.5) from the Large Early Galaxy Astrophysics Census (LEGA-C) spectroscopic survey at a lookback time of $\sim$7 billion years and quantify the population trends leveraging 20hr-deep integrated spectra of these $\sim$ 1800 star-forming and $\sim$ 1200 quiescent galaxies at 0.6 < $z$ < 1.0. Essentially all galaxies at this epoch contain stars of age < 3 Gyr, in contrast with older massive galaxies today, facilitating better recovery of previous generations of star formation at cosmic noon and earlier. We conduct spectro-photometric analysis using parametric and non-parametric Bayesian SPS modeling tools - Bagpipes and Prospector to constrain the median star-formation histories of this mass-complete sample and characterize population trends. A consistent picture arises for the late-time stellar mass growth when quantified as $t_{50}$ and $t_{90}$, corresponding to the age of the universe when galaxies formed 50\% and 90\% of their total stellar mass, although the two sets of models disagree at the earliest formation times (e.g. $t_{10}$). Our results reveal trends in both stellar mass and stellar velocity dispersion as in the local universe - low-mass galaxies with shallower potential wells grow their stellar masses later in cosmic history compared to high-mass galaxies. Unlike local quiescent galaxies, the median duration of late-time star-formation ($\tau_{SF,late}$ = $t_{90}$ - $t_{50}$) does not consistently depend on the stellar mass. This census sets a benchmark for future deep spectro-photometric studies of the more distant universe.Comment: 25 pages, 12 figures, 4 tables, submitted to Ap

Preduodenal portal vein: A recipe for disaster during laparoscopic cholecystectomy

We had encountered a very rare congenital anomaly of a preduodenal portal vein while doing laparoscopic cholecystectomy. More significant in our case is that this preduodenal vein is hiding behind omental adhesions with the gallbladder. We want to raise awareness about this very rare anomaly. Recognition and knowledge of this anomaly will prevent the potential of a serious operative misadventure

Solitary fibrous tumor of the liver: a rare tumor in a rarer location

Solitary fibrous tumor is an uncommon mesenchymal neoplasm. Liver is a rare location of this tumor. We report a case of hepatic solitary fibrous tumor in a 56-year-old female, who presented with right upper abdominal pain. An extended right hepatectomy was performed. Histopathological and immunohistochemical examination revealed solitary fibrous tumor of the liver

Inguinal Hernia as an Initial Presentation of Pseudomyxoma Peritonei

Pseudomyxoma Peritonei (PMP) is characterized by presence of abundant extracellular mucin in the peritoneum. Preoperative diagnosis of pseudomyxoma peritonei is difficult due to its varied presentation. We report a case of pseudomyxoma peritonei in a 64-year-old male, who initially presented with right inguinal hernia and then with recurrence as left inguino-scrotal hernia. A debulking surgery including subtotal colectomy, cholecystectomy and splenectomy along with peritonectomy was performed. The left inguino-scrotal hernia was reduced and a left inguinal hernioplasty was performed. This case is reported to highlight that pseudomyxoma peritonei can present as inguinal hernia and therefore, a thorough examination of the hernial contents for mucin should be done

Inguinal mass: An unusual presentation of gastroesophageal junction adenocarcinoma

Gastroesophageal junction (GEJ) tumors are inherently aggressive owing to their location near vital structures and early lymphatic spread. The usual symptoms at presentation are dysphagia, regurgitation, and weight loss. Lymphatic involvement is seen early due to abundant submucosal lymphatics and is an important prognostic marker. Nodal involvement is frequently seen in the mediastinum and abdomen as these are the loco-regional nodal basins. Nodal spread beyond these basins is infrequent. We report a case of GEJ adenocarcinoma with inguinal mass secondary to inguinal nodal metastasis as a presenting symptom

A Census of Star Formation Histories of Massive Galaxies at 0.6 < z < 1 from Spectrophotometric Modeling Using Bagpipes and Prospector

We present individual star formation histories (SFHs) of ∼3000 massive galaxies (log( M _* / M _⊙ ) > 10.5) from the Large Early Galaxy Astrophysics Census spectroscopic survey at a lookback time of ∼7 billion yr and quantify the population trends leveraging 20 hr deep-integrated spectra of these ∼1800 star-forming and ∼1200 quiescent galaxies at 0.6 < z < 1.0. Essentially all galaxies at this epoch contain stars of age <3 Gyr, in contrast with older massive galaxies today, facilitating better recovery of previous generations of star formation at cosmic noon and earlier. We conduct spectrophotometric analysis using parametric and nonparametric Bayesian stellar population synthesis modeling tools— Bagpipes and Prospector —to constrain the median SFHs of this mass complete sample and characterize population trends. A consistent picture arises for the late-time stellar mass growth when quantified as t _50 and t _90 , corresponding to the age of the Universe when galaxies formed 50% and 90% of their total stellar mass, although the two methods disagree at the earliest formation times (e.g., t _10 ). Our results reveal trends in both stellar mass and stellar velocity dispersion as in the local Universe—low-mass galaxies with shallower potential wells grow their stellar masses later in cosmic history compared to high-mass galaxies. Unlike local quiescent galaxies, the median duration of late-time star formation ( τ _SF,late = t _90 – t _50 ) does not consistently depend on the stellar mass. This census sets a benchmark for future deep spectrophotometric studies of the more distant Universe