Report from the Subaru Telescope for External
... dark matter. Lensing studies of clusters have indeed confirmed several important predictions of the standard-cold dark matter dominated (CDM) model. Okabe et al.(2010) used high-quality Subaru Telescope/Suprime-Cam imaging data to conduct a detailed weak lensing study of the distribution of dark matt ...
... dark matter. Lensing studies of clusters have indeed confirmed several important predictions of the standard-cold dark matter dominated (CDM) model. Okabe et al.(2010) used high-quality Subaru Telescope/Suprime-Cam imaging data to conduct a detailed weak lensing study of the distribution of dark matt ...
harlow shapley - National Academy of Sciences
... respect to the center of our galaxy were accepted by the astronomical world with little or no opposition. The outline that Shapley had drawn seemed to fit really much better into our overall view of the Milky Way system than did the picture that had been given to us by earlier astronomers. Northern ...
... respect to the center of our galaxy were accepted by the astronomical world with little or no opposition. The outline that Shapley had drawn seemed to fit really much better into our overall view of the Milky Way system than did the picture that had been given to us by earlier astronomers. Northern ...
The correlation between galaxy morphology and star
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
... et al. 2010; Cassata et al. 2010). The number density of these galaxies rapidly increases, by a factor of five, from z ∼ 2 to z ∼ 1, and they are up to 5 times more compact in size than local ones with similar mass (Cassata et al. 2011, 2013). Recent works have suggested, however, that a large fract ...
Galaxy Disks Further
... Abstract The disks of disk galaxies contain a substantial fraction of their baryonic matter and angular momentum, and much of the evolutionary activity in these galaxies, such as the formation of stars, spiral arms, bars and rings, and the various forms of secular evolution, takes place in their dis ...
... Abstract The disks of disk galaxies contain a substantial fraction of their baryonic matter and angular momentum, and much of the evolutionary activity in these galaxies, such as the formation of stars, spiral arms, bars and rings, and the various forms of secular evolution, takes place in their dis ...
Observations and Theory of Dynamical Triggers for Star Formation
... triggering, with a distinction made between small, intermediate, and large scales in the following sense: Small scale triggering (Table 1): direct squeezing of preexisting clouds or globules by high pressure that nearly surrounds the whole cloud. This includes triggering in bright rims, proplyds, an ...
... triggering, with a distinction made between small, intermediate, and large scales in the following sense: Small scale triggering (Table 1): direct squeezing of preexisting clouds or globules by high pressure that nearly surrounds the whole cloud. This includes triggering in bright rims, proplyds, an ...
Gaia 1 and 2. A pair of new satellites of the Galaxy
... Given that the first Gaia DR does not provide colour information, we have to be particularly careful when selecting objects for the satellite search (we cannot use colourmagnitude masks based on stellar isochrones, as in i.e. Koposov et al. 2015). For the analysis in this paper we apply only two sel ...
... Given that the first Gaia DR does not provide colour information, we have to be particularly careful when selecting objects for the satellite search (we cannot use colourmagnitude masks based on stellar isochrones, as in i.e. Koposov et al. 2015). For the analysis in this paper we apply only two sel ...
An X-Ray, Optical and Infra-red study of High-Mass X
... given me a wealth of information on which to base my thesis and sent me to some of the world’s most incredible places in the process. I feel extremely lucky to have been able to use my Ph.D. as a stepping stone to visit many a beautiful city and inspiring mountain top, and I thank Malcolm for being ...
... given me a wealth of information on which to base my thesis and sent me to some of the world’s most incredible places in the process. I feel extremely lucky to have been able to use my Ph.D. as a stepping stone to visit many a beautiful city and inspiring mountain top, and I thank Malcolm for being ...
here
... minutes to 24.8 arc minutes but increases in illumination from 27% to 48% during the course of the month. As the sun rises in late May, Venus will reach an altitude of about 23 degrees for observers at 40 degrees north. The brightest planet is at the descending node on May 9th. On May 22nd, Venus li ...
... minutes to 24.8 arc minutes but increases in illumination from 27% to 48% during the course of the month. As the sun rises in late May, Venus will reach an altitude of about 23 degrees for observers at 40 degrees north. The brightest planet is at the descending node on May 9th. On May 22nd, Venus li ...
Astronomy Astrophysics - Niels Bohr Institutet
... All A5-G0 stars brighter than mvis = 8.3, G0 stars in the interval 8.30 ≤ mvis ≤ 8.40, and all G5 or just G stars (no subtypes) brighter than mvis = 8.6 were selected. On the one hand, the A5 spectral-type limit is early enough to include even quite metal-poor F stars; on the other hand, most K0-typ ...
... All A5-G0 stars brighter than mvis = 8.3, G0 stars in the interval 8.30 ≤ mvis ≤ 8.40, and all G5 or just G stars (no subtypes) brighter than mvis = 8.6 were selected. On the one hand, the A5 spectral-type limit is early enough to include even quite metal-poor F stars; on the other hand, most K0-typ ...
Rich
... star forming galaxies. The distributions of IR-luminosities and optical luminosities span 2 orders of magnitude. The optical distribution is bimodal in part due to AGN contamination as 11/22 LAEs with 0.0Mr< -22.5 are AGN. • Dust extinction is likely not the dominant effect inhibiting Lyα from escap ...
... star forming galaxies. The distributions of IR-luminosities and optical luminosities span 2 orders of magnitude. The optical distribution is bimodal in part due to AGN contamination as 11/22 LAEs with 0.0Mr< -22.5 are AGN. • Dust extinction is likely not the dominant effect inhibiting Lyα from escap ...
Cool Stars in the Galaxy — A ROSAT and ASCA View.
... lution instruments on Skylab (Reeves 1976, Vaiana et al. 1973) showed the solar corona to be composed of complex loop structures associated with underlying photospheric and chromospheric features, in particular magnetic field structures. Also in the 1970’s, the detection of X-ray quiescent and flari ...
... lution instruments on Skylab (Reeves 1976, Vaiana et al. 1973) showed the solar corona to be composed of complex loop structures associated with underlying photospheric and chromospheric features, in particular magnetic field structures. Also in the 1970’s, the detection of X-ray quiescent and flari ...
Altas Farnese
... the globe shows the head only as being near the Arctic Circle and the raven and cup as only tangent to the equator. Hipparchus was perhaps the greatest astronomer of Antiquity, his outstanding discovery being the precession of the equinoxes. He is said to have compiled a large star catalogue with at ...
... the globe shows the head only as being near the Arctic Circle and the raven and cup as only tangent to the equator. Hipparchus was perhaps the greatest astronomer of Antiquity, his outstanding discovery being the precession of the equinoxes. He is said to have compiled a large star catalogue with at ...
The Astrology of Space - Matrix Astrology Software
... All rights reserved. No part of the publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of the publisher. Graphics designed by Michael Erlewine Some graph ...
... All rights reserved. No part of the publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of the publisher. Graphics designed by Michael Erlewine Some graph ...
Stellarium User Guide
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
... scipting facility is Stellarium’s version of a “Presentation”, a feature that may be used to run an astronomical or other presentation for instruction or entertainment from within the Stellarium program. The original Stratoscript was quite limited in what it could do so a new Stellarium Scripting Sy ...
The empirical grounds of SN
... a) we may be seeing intrinsically similar phenomena under different angles. GRB 030329/SN 2003dh may be viewed ~ pole-on, GRB 980425/SN 1998bw considerably off-axis (15-30°, Maeda et al. 2005). GRB 031203/SN 2003lw may lie in between (Ramirez-Ruiz et al. 2005) In this scenario the g-properties are ...
... a) we may be seeing intrinsically similar phenomena under different angles. GRB 030329/SN 2003dh may be viewed ~ pole-on, GRB 980425/SN 1998bw considerably off-axis (15-30°, Maeda et al. 2005). GRB 031203/SN 2003lw may lie in between (Ramirez-Ruiz et al. 2005) In this scenario the g-properties are ...
Chandra News March 2005 Published by the Chandra X-ray Center (CXC)
... a scan of the Galactic plane with a rocket-borne detector. In 1979, the first Einstein observation of this region showed that this source was the Carina Nebula, over 1 degree in extent - a bright (by present standards) diffuse source sprinkled with dozens of point-like O stars. Although η Carinae it ...
... a scan of the Galactic plane with a rocket-borne detector. In 1979, the first Einstein observation of this region showed that this source was the Carina Nebula, over 1 degree in extent - a bright (by present standards) diffuse source sprinkled with dozens of point-like O stars. Although η Carinae it ...
Giant molecular clouds in the Local Group galaxy M 33⋆⋆⋆
... to study the properties of the GMCs in this subsolar metallicity galaxy. The CPROPS (Cloud PROPertieS) algorithm was used to identify 337 GMCs in M 33, the largest sample to date for an external galaxy. The sample is used to study the GMC luminosity function, or mass spectrum under the assumption of ...
... to study the properties of the GMCs in this subsolar metallicity galaxy. The CPROPS (Cloud PROPertieS) algorithm was used to identify 337 GMCs in M 33, the largest sample to date for an external galaxy. The sample is used to study the GMC luminosity function, or mass spectrum under the assumption of ...
... If secular processes built dense central components that masquerade as bulges, how can we distinguish them from merger-built bulges? Observations show that pseudobulges retain a memory of their disky origin. That is, they have one or more characteristics of disks: (a) flatter shapes than those of cl ...
The visibility of Lyman Alpha Emitters: constraining reionization
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
... This work is quite close in spirit to the calculations presented in Dayal et al. (2011) wherein the authors used (a) cosmological hydrodynamic simulations run with GADGET-2 to obtain the physical properties of z ≃ 5.7 galaxies, (b) a dust model that took into account the entire star formation histor ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
... and on these scales the density fluctuations are small in size (rms fluctuations of the order ∼ 0.1 at 1 Gpc). However, on scales of the order of 10 Mpc, the density fluctuations are large (∼ 1). The most apparent overdensities are therefore on small scales, less than 10 Mpc which are the typical sc ...
... and on these scales the density fluctuations are small in size (rms fluctuations of the order ∼ 0.1 at 1 Gpc). However, on scales of the order of 10 Mpc, the density fluctuations are large (∼ 1). The most apparent overdensities are therefore on small scales, less than 10 Mpc which are the typical sc ...
Article PDF - IOPscience
... previous work (Hernitschek et al. 2016), we overcame these challenges by characterizing time-series of PS1 sources using three statistics: a c 2 -based variability indicator, a variability amplitude (in the rP1-band) wr , and a variability timescale τ, where the latter two were obtained by fitting a ...
... previous work (Hernitschek et al. 2016), we overcame these challenges by characterizing time-series of PS1 sources using three statistics: a c 2 -based variability indicator, a variability amplitude (in the rP1-band) wr , and a variability timescale τ, where the latter two were obtained by fitting a ...
Ages of Young Stars
... ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke et al. (2004). These results show that LDB age uncertainties have yet to attain the floor set by levels of theoretical understanding. There is scope for improvement, particularly in defining the po ...
... ally negligible) and, presented separately, the systematic absolute age uncertainty estimated by Burke et al. (2004). These results show that LDB age uncertainties have yet to attain the floor set by levels of theoretical understanding. There is scope for improvement, particularly in defining the po ...
Ages of young stars
... individual objects. A reliable age scale is established above 20 Myr from measurement of the Lithium Depletion Boundary (LDB) in young clusters, and consistency is shown between these ages and those from the upper main sequence and the main sequence turn-off – if modest core convection and rotation ...
... individual objects. A reliable age scale is established above 20 Myr from measurement of the Lithium Depletion Boundary (LDB) in young clusters, and consistency is shown between these ages and those from the upper main sequence and the main sequence turn-off – if modest core convection and rotation ...
exoplanet observing for amateurs
... transit in front of their star (15 that are brighter than 13th magnitude), and the number is growing so fast that by the time this book appears the number could be two or three dozen. It is important to realize that bright transiting exoplanets are far more valuable than faint or non-transiting ones ...
... transit in front of their star (15 that are brighter than 13th magnitude), and the number is growing so fast that by the time this book appears the number could be two or three dozen. It is important to realize that bright transiting exoplanets are far more valuable than faint or non-transiting ones ...
Multiplicity in Early Stellar Evolution - Astronomy Group
... Observations from optical to centimeter wavelengths have demonstrated that multiple systems of two or more bodies is the norm at all stellar evolutionary stages. Multiple systems are widely agreed to result from the collapse and fragmentation of cloud cores, despite the inhibiting influence of magne ...
... Observations from optical to centimeter wavelengths have demonstrated that multiple systems of two or more bodies is the norm at all stellar evolutionary stages. Multiple systems are widely agreed to result from the collapse and fragmentation of cloud cores, despite the inhibiting influence of magne ...
Serpens
Serpens (""the Serpent"", Greek Ὄφις) is a constellation of the northern hemisphere. One of the 48 constellations listed by the 2nd-century astronomer Ptolemy, it remains one of the 88 modern constellations defined by the International Astronomical Union. It is unique among the modern constellations in being split into two non-contiguous parts, Serpens Caput (Serpent's Head) to the west and Serpens Cauda (Serpent's Tail) to the east. Between these two halves lies the constellation of Ophiuchus, the ""Serpent-Bearer"". In figurative representations, the body of the serpent is represented as passing behind Ophiuchus between Mu Serpentis in Serpens Caput and Nu Serpentis in Serpens Cauda.The brightest star in Serpens is the red giant star Alpha Serpentis, or Unukalhai, in Serpens Caput, with an apparent magnitude of 2.63. Also located in Serpens Caput are the naked-eye globular cluster Messier 5 and the naked-eye variables R Serpentis and Tau4 Serpentis. Notable extragalactic objects include Seyfert's Sextet, one of the densest galaxy clusters known; Arp 220, the prototypical ultraluminous infrared galaxy; and Hoag's Object, the most famous of the very rare class of galaxies known as ring galaxies.Part of the Milky Way's galactic plane passes through Serpens Cauda, which is therefore rich in galactic deep-sky objects, such as the Eagle Nebula (IC 4703) and its associated star cluster Messier 16. The nebula measures 70 light-years by 50 light-years and contains the Pillars of Creation, three dust clouds that became famous for the image taken by the Hubble Space Telescope. Other striking objects include the Red Square Nebula, one of the few objects in astronomy to take on a square shape; and Westerhout 40, a massive nearby star-forming region consisting of a molecular cloud and an H II region.