分类： 天文学 >> 天文学 提交时间： 2023-02-19
Duncan Farrah
Sara Petty
Kevin Croker
Gregory Tarle
Michael Zevin
Evanthia Hatziminaoglou
Francesco Shankar
Lingyu Wang
David L Clements
Andreas Efstathiou
Mark Lacy
Kurtis A. Nishimura
Jose Afonso
Chris Pearson
Lura K Pitchford
摘要： The assembly of stellar and supermassive black hole (SMBH) mass in elliptical galaxies since $z\sim1$ can help to diagnose the origins of locally-observed correlations between SMBH mass and stellar mass. We therefore construct three samples of elliptical galaxies, one at $z\sim0$ and two at $0.7\lesssim z \lesssim2.5$, and quantify their relative positions in the $M_{BH}-M_*$ plane. Using a Bayesian analysis framework, we find evidence for translational offsets in both stellar mass and SMBH mass between the local sample and both higher redshift samples. The offsets in stellar mass are small, and consistent with measurement bias, but the offsets in SMBH mass are much larger, reaching a factor of seven between $z\sim1$ and $z\sim0$. The magnitude of the SMBH offset may also depend on redshift, reaching a factor of $\sim20$ at $z\sim 2$. The result is robust against variation in the high and low redshift samples and changes in the analysis approach. The magnitude and redshift evolution of the offset are challenging to explain in terms of selection and measurement biases. We conclude that either there is a physical mechanism that preferentially grows SMBHs in elliptical galaxies at $z\lesssim 2$, or that selection and measurement biases are both underestimated, and depend on redshift.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Fan Zou
Guang Yang
W. N. Brandt
Qingling Ni
Franz E. Bauer
Giovanni Covone
Mark Lacy
Nicola R. Napolitano
Kristina Nyland
Maurizio Paolillo
Mario Radovich
Marilena Spavone
Mattia Vaccari
摘要： The W-CDF-S and ELAIS-S1 fields will be two of the LSST Deep Drilling fields, but the availability of spectroscopic redshifts within these two fields is still limited on deg^2 scales. To prepare for future science, we use EAZY to estimate photometric redshifts (photo-zs) in these two fields based on forced-photometry catalogs. Our photo-z catalog consists of ~0.8 million sources covering 4.9 deg^2 in W-CDF-S and ~0.8 million sources covering 3.4 deg^2 in ELAIS-S1, among which there are ~0.6 (W-CDF-S) and ~0.4 (ELAIS-S1) million sources having signal-to-noise-ratio (SNR) > 5 detections in more than 5 bands. By comparing photo-zs and available spectroscopic redshifts, we demonstrate the general reliability of our photo-z measurements. Our photo-z catalog is publicly available at \doi{10.5281/zenodo.4603178}.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Jianrui Li
Bjorn H. C. Emonts
Zheng Cai
J. Xavier Prochaska
Ilsang Yoon
Matthew D. Lehnert
Shiwu Zhang
Yunjing Wu
Jianan Li
Mingyu Li
Mark Lacy
Montserrat Villar-Martín
摘要： The link between the circum-galactic medium (CGM) and the stellar growth of massive galaxies at high-$z$ depends on the properties of the widespread cold molecular gas. As part of the SUPERCOLD-CGM survey (Survey of Protocluster ELANe Revealing CO/\ci\ in the Ly$\alpha$-Detected CGM), we present the radio-loud QSO Q1228+3128 at $z=2.2218$, which is embedded in an enormous Ly$\alpha$ nebula. ALMA+ACA observations of CO(4-3) reveal both a massive molecular outflow, and a more extended molecular gas reservoir across $\sim$100 kpc in the CGM each containing a mass of M$_{\rm H2}$\,$\sim$\,4$-$5\,$\times$\,10$^{10}$ M$_{\odot}$. The outflow and molecular CGM are aligned spatially, along the direction of an inner radio jet. After re-analysis of Ly$\alpha$ data of Q1228+3128 from the Keck Cosmic Web Imager, we found that the velocity of the extended CO agrees with the redshift derived from the Ly$\alpha$ nebula and the bulk velocity of the massive outflow. We propose a scenario where the radio source in Q1228+3128 is driving the molecular outflow and perhaps also enriching or cooling the CGM. In addition, we found that the extended CO emission is nearly perpendicular to the extended Ly$\alpha$ nebula spatially, indicating that the two gas phases are not well mixed, and possibly even represent different phenomena (e.g., outflow vs. infall). Our results provide crucial evidence in support of predicted baryonic recycling processes that drive the early evolution of massive galaxies.
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Duncan Farrah
Kevin S. Croker
Gregory Tarlé
Valerio Faraoni
Sara Petty
Jose Afonso
Nicolas Fernandez
Kurtis A. Nishimura
Chris Pearson
Lingyu Wang
Michael Zevin
David L Clements
Andreas Efstathiou
Evanthia Hatziminaoglou
Mark Lacy
Conor McPartland
Lura K Pitchford
Nobuyuki Sakai
Joel Weiner
摘要： Observations have found black holes spanning ten orders of magnitude in mass
across most of cosmic history. The Kerr black hole solution is however
provisional as its behavior at infinity is incompatible with an expanding
universe. Black hole models with realistic behavior at infinity predict that
the gravitating mass of a black hole can increase with the expansion of the
universe independently of accretion or mergers, in a manner that depends on the
black hole's interior solution. We test this prediction by considering the
growth of supermassive black holes in elliptical galaxies over
$0
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Eilat Glikman
Cristian E. Rusu
Geoff C. -F. Chen
James Hung-Hsu Chan
Cristiana Spingola
Hannah Stacey
John McKean
Ciprian T. Berghea
S. G. Djorgovski
Matthew J. Graham
Daniel Stern
Tanya Urrutia
Mark Lacy
Nathan J. Secrest
John M. O'Meara
摘要： We present the discovery of a gravitationally lensed dust-reddened QSO at z = 2.517, identified in a survey for QSOs by infrared selection. Hubble Space Telescope imaging reveals a quadruply lensed system in a cusp configuration, with a maximum image separation of ~1.8\arcsec. We find that compared to the central image of the cusp, the neighboring brightest image is anomalous by a factor of ~ 7 - 10, which is the largest flux anomaly measured to date in a lensed QSO. Incorporating high-resolution Jansky Very Large Array radio imaging and sub-mm imaging with the Atacama Large (sub-)Millimetre Array, we conclude that a low-mass perturber is the most likely explanation for the anomaly. The optical through near-infrared spectrum reveals that the QSO is moderately reddened with E(B - V) = 0.7 - 0.9. We see an upturn in the ultraviolet spectrum due to ~ 1% of the intrinsic emission being leaked back into the line of sight, which suggests that the reddening is intrinsic and not due to the lens. The QSO may have an Eddington ratio as high as L/L_Edd ~ 0.2. Consistent with previous red QSO samples, this source exhibits outflows in its spectrum as well as morphological properties suggestive of it being in a merger-driven transitional phase. We find a host-galaxy stellar mass of log M_*/M_Sun = 11.4, which is higher than the local M_BH vs. M_* relation, but consistent with other high redshift QSOs. When de-magnified, this QSO is at the knee of the luminosity function, allowing for the detailed study of a more typical moderate-luminosity infrared-selected QSO at high redshift.
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