相关论文: The Local Volume galaxy census and HST SNAP survey…

Star Formation Histories of Local Group Dwarf Galaxies

40 galaxies are currently known as, or suspected to be Local Group members within a radius of 1.8 Mpc. 37 of these galaxies are dwarf galaxies with M_B > -18.5 mag. I present a compilation of the star formation histories of dwarf…

天体物理学 · 物理学 2007-05-23 Eva K. Grebel

Sardinia Radio Telescope observations of Local Group dwarf galaxies -- I. The cases of NGC6822, IC1613, and WLM

Almost all dwarf galaxies in the Local Group that are not satellites of the Milky Way or M31, belong to either one of two highly-symmetric planes. It is still a matter of debate, whether these planar structures are dynamically stable or…

星系天体物理 · 物理学 2020-01-15 A. Tarchi , P. Castangia , G. Surcis , A. Brunthaler , C. Henkel , M. Pawlowski , K. M. Menten , A. Melis , S. Casu , M. Murgia , A. Trois , R. Concu , J. Darling

Distance Scale, Variable Stars and Stellar Populations in Local Group Galaxies

We present an overview of our study of the short period variable stars in the Large Magellanic Cloud, and in the dwarf galaxies Fornax, Leo I, and NGC 6822. Light curves are presented for RR Lyrae stars, Anomalous Cepheids and, for the…

天体物理学 · 物理学 2007-05-23 G. Clementini

Tracing the Local Volume galaxy halo-to-stellar mass ratio with satellite kinematics

Rapid advance has been made recently in accurate distance measurements for nearby ($D < 11$ Mpc) galaxies based on the magnitude of the tip of red giant branch stars resolved with the Hubble Space Telescope. We use observational properties…

星系天体物理 · 物理学 2021-09-02 Igor D. Karachentsev , Olga G. Kashibadze

Groups of dwarf galaxies in the Local supercluster

We present a project on study of groups composed of dwarf galaxies only. We selected such structures using HyperLEDA and NED databases with visual inspection on SDSS images and on digital copy of POSS. The groups are characterized by size…

宇宙学与河外天体物理 · 物理学 2015-05-20 Dmitry Makarov , Igor Karachentsev , Roman Uklein

Dwarf Galaxies of the Local Group

The Local Group (LG) dwarf galaxies offer a unique window to the detailed properties of the most common type of galaxy in the Universe. In this review, I update the census of LG dwarfs based on the most recent distance and radial velocity…

天体物理学 · 物理学 2008-11-26 Mario Mateo

Properties of Two New M31 dSph Companions from Keck Imaging

We have obtained Keck Low Resolution Imaging Spectrograph images in V and I of the newly discovered Local Group dwarf galaxies Pegasus dSph and Cassiopeia dSph and their surrounding field. The first stellar luminosity functions and…

天体物理学 · 物理学 2009-10-31 Eva K. Grebel , Puragra Guhathakurta

The Isaac Newton Telescope Monitoring Survey of Local Group Dwarf Galaxies. VII. Long-Period Variable Stars in the Nearest Starburst Dwarf Galaxy, IC 10

To identify long-period variable (LPV) stars in IC10 - the nearest starburst galaxy of the Local Group (LG) - we conducted an optical monitoring survey using the 2.5-m Isaac Newton Telescope (INT) with the wide-field camera (WFC) in the…

星系天体物理 · 物理学 2025-05-08 Mahtab Gholami , Atefeh Javadi , Hamidreza Mahani , Jacco van Loon , Habib Khosroshahi , Elham Saremi , Iain McDonald , Samaneh Eftekhari , Yi Ren , Hamed Altafi

The Sample of Red Supergiants in Twelve Low-Mass Galaxies of the Local Group

This work establishes the most complete sample of red supergiants (RSGs) in twelve low-mass galaxies (WLM, IC 10, NGC 147, NGC 185, IC 1613, Leo A, Sextans B, Sextans A, NGC 6822, Pegasus Dwarf, SMC and LMC) of the Local Group, which forms…

星系天体物理 · 物理学 2022-01-05 Yi Ren , Biwei Jiang , Ming Yang , Tianding Wang , Tongtian Ren

The LBT Satellites of Nearby Galaxies Survey (LBT-SONG): The Satellite Population of NGC 628

We present the first satellite system of the Large Binocular Telescope Satellites Of Nearby Galaxies Survey (LBT-SONG), a survey to characterize the close satellite populations of Large Magellanic Cloud to Milky Way-mass, star-forming…

星系天体物理 · 物理学 2020-11-11 A. Bianca Davis , Anna M. Nierenberg , Annika H. G. Peter , Christopher T. Garling , Johnny P. Greco , Christopher S. Kochanek , Dyas Utomo , Kirsten Casey , Richard W. Pogge , Daniella Roberts , David J. Sand , Amy Sardone

Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies

Dwarf spheroidal galaxies of the Local Group are close satellites of the Milky Way characterized by a large mass-to-light ratio and are not expected to be the site of non-thermal high-energy gamma-ray emission or intense star formation.…

高能天体物理现象 · 物理学 2015-03-12 H. E. S. S. Collaboration , : , A. Abramowski , F. Aharonian , F. Ait Benkhali , A. G. Akhperjanian , E. Angüner , M. Backes , S. Balenderan , A. Balzer , A. Barnacka , Y. Becherini , J. Becker Tjus , D. Berge , S. Bernhard , K. Bernlöhr , E. Birsin , J. Biteau , M. Böttcher , C. Boisson , J. Bolmont , P. Bordas , J. Bregeon , F. Brun , P. Brun , M. Bryan , T. Bulik , S. Carrigan , S. Casanova , P. M. Chadwick , N. Chakraborty , R. Chalme-Calvet , R. C. G. Chaves , M. Chrétien , S. Colafrancesco , G. Cologna , J. Conrad , C. Couturier , Y. Cui , M. Dalton , I. D. Davids , B. Degrange , C. Deil , P. deWilt , A. Djannati-Ataï , W. Domainko , A. Donath , L. O'C. Drury , G. Dubus , K. Dutson , J. Dyks , M. Dyrda , T. Edwards , K. Egberts , P. Eger , P. Espigat , C. Farnier , S. Fegan , F. Feinstein , M. V. Fernandes , D. Fernandez , A. Fiasson , G. Fontaine , A. Förster , M. Füßling , S. Gabici , M. Gajdus , Y. A. Gallant , T. Garrigoux , G. Giavitto , B. Giebels , J. F. Glicenstein , D. Gottschall , A. Goudelis , M. -H. Grondin , M. Grudzińska , D. Hadsch , S. Häffner , J. Hahn , J. Harris , G. Heinzelmann , G. Henri , G. Hermann , O. Hervet , A. Hillert , J. A. Hinton , W. Hofmann , P. Hofverberg , M. Holler , D. Horns , A. Ivascenko , A. Jacholkowska , C. Jahn , M. Jamrozy , M. Janiak , F. Jankowsky , I. Jung , M. A. Kastendieck , K. Katarzyński , U. Katz , S. Kaufmann , B. Khélifi , M. Kieffer , S. Klepser , D. Klochkov , W. Kluźniak , D. Kolitzus , Nu. Komin , K. Kosack , S. Krakau , F. Krayzel , P. P. Krüger , H. Laffon , G. Lamanna , J. Lefaucheur , V. Lefranc , A. Lemiére , M. Lemoine-Goumard , J. -P. Lenain , T. Lohse , A. Lopatin , C. -C. Lu , V. Marandon , A. Marcowith , R. Marx , G. Maurin , N. Maxted , M. Mayer , T. J. L. McComb , J. Méhault , P. J. Meintjes , U. Menzler , M. Meyer , A. M. W. Mitchell , R. Moderski , M. Mohamed , K. Morå , E. Moulin , T. Murach , M. de Naurois , J. Niemiec , S. J. Nolan , L. Oakes , H. Odaka , S. Ohm , B. Opitz , M. Ostrowski , I. Oya , M. Panter , R. D. Parsons , M. Paz Arribas , N. W. Pekeur , G. Pelletier , J. Perez , P. -O. Petrucci , B. Peyaud , S. Pita , H. Poon , G. Pühlhofer , M. Punch , A. Quirrenbach , S. Raab , I. Reichardt , A. Reimer , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger , L. Rob , C. Romoli , S. Rosier-Lees , G. Rowell , B. Rudak , C. B. Rulten , V. Sahakian , D. Salek , D. A. Sanchez , A. Santangelo , R. Schlickeiser , F. Schüssler , A. Schulz , U. Schwanke , S. Schwarzburg , S. Schwemmer , P. Serpico , H. Sol , F. Spanier , G. Spengler , F. Spieß , L. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , K. Stycz , I. Sushch , J. -P. Tavernet , T. Tavernier , A. M. Taylor , R. Terrier , M. Tluczykont , C. Trichard , K. Valerius , C. van Eldik , B. van Soelen , G. Vasileiadis , J. Veh , C. Venter , A. Viana , P. Vincent , J. Vink , H. J. Völk , F. Volpe , M. Vorster , T. Vuillaume , S. J. Wagner , P. Wagner , R. M. Wagner , M. Ward , M. Weidinger , Q. Weitzel , R. White , A. Wierzcholska , P. Willmann , A. Wörnlein , D. Wouters , R. Yang , V. Zabalza , D. Zaborov , M. Zacharias , A. A. Zdziarski , A. Zech , H. -S. Zechlin

A New Milky Way Dwarf Satellite in Canes Venatici

In this Letter, we announce the discovery of a new dwarf satellite of the Milky Way, located in the constellation Canes Venatici. It was found as a stellar overdensity in the North Galactic Cap using Sloan Digital Sky Survey Data Release 5…

天体物理学 · 物理学 2010-04-06 D. B. Zucker , V. Belokurov , N. W. Evans , M. I. Wilkinson , M. J. Irwin , T. Sivarani , S. Hodgkin , D. M. Bramich , J. M. Irwin , G. Gilmore , B. Willman , S. Vidrih , M. Fellhauer , P. C. Hewett , T. C. Beers , E. F. Bell , E. K. Grebel , D. P. Schneider , H. J. Newberg , R. F. G. Wyse , C. M. Rockosi , B. Yanny , R. Lupton , J. A. Smith , J. C. Barentine , H. Brewington , J. Brinkmann , M. Harvanek , S. J. Kleinman , J. Krzesinski , D. Long , A. Nitta , S. A. Snedden

H-alpha survey of nearby dwarf galaxies

We present the H-alpha imaging data and flux measurements for 30 dwarf galaxies in the Local volume. The H-alpha fluxes are used to derive the galaxy star formation rate, SFR. The sample of observed galaxies is characterized by the…

宇宙学与河外天体物理 · 物理学 2015-06-05 S. S. Kaisin , I. D. Karachentsev , S. Ravindranath

Search for Giant Planets around White Dwarfs with HST, Spitzer, and VLT

For the last three years we have performed a survey for young (<3 Gyrs) giant planets around nearby white dwarfs with HST, Spitzer, and VLT. Direct HST/NICMOS imaging of the seven white dwarfs in the Hyades gave no evidence for companions…

天体物理学 · 物理学 2007-05-23 S. Friedrich , H. Zinnecker , S. Correia , W. Brandner , M. Burleigh , M. McCaughrean

A Plane of High Velocity Galaxies Across the Local Group

We recently showed that several Local Group (LG) galaxies have much higher radial velocities (RVs) than predicted by a 3D dynamical model of the standard cosmological paradigm. Here, we show that 6 of these 7 galaxies define a thin plane…

星系天体物理 · 物理学 2017-11-30 Indranil Banik , Hongsheng Zhao

The white dwarf cooling sequence of the Galactic bulge

We collected F606W- and F814W-band time-series data of the Sagittarius low-reddening window in the Galactic bulge with the Advanced Camera far Surveys mounted on the Hubble Space Telescope. We sampled the region approximately every two…

太阳与恒星天体物理 · 物理学 2013-08-09 A. Calamida , K. Sahu , J. Anderson , S. Casertano , T. Brown , S. Cassisi , J. Sokol , H. Bond , H. Ferguson , M. Livio , M. Salaris , J. Valenti

ACS imaging of 25 galaxies in nearby groups and in the field

We present HST/ACS images and color-magnitude diagrams for 25 nearby galaxies with radial velocities V_LG < 500 km/s. Distances are determined based on the luminosities of stars at the tip of the red giant branch that range from 2 Mpc to 12…

天体物理学 · 物理学 2008-11-26 I. D. Karachentsev , A. Dolphin , R. B. Tully , M. Sharina , L. Makarova , D. Makarov , V. Karachentseva , Sh. Sakai , E. J. Shaya

Possible Subgroups of Globular Clusters and Planetary Nebulae in NGC 5128

We use recently compiled position and velocity data for the globular cluster and planetary nebula subsystems in NGC 5128, the nearby giant elliptical, to search for evidence of past dwarf-satellite accretion events. Beyond a 10 arcmin (~11…

宇宙学与河外天体物理 · 物理学 2015-05-20 Kristin A. Woodley , William E. Harris

Proper Motions and Orbits of Distant Local Group Dwarf Galaxies from a combination of Gaia and Hubble Data

We have determined the proper motions (PMs) of 12 dwarf galaxies in the Local Group (LG), ranging from the outer Milky Way (MW) halo to the edge of the LG. We used HST as the first and Gaia as the second epoch using the GaiaHub software.…

星系天体物理 · 物理学 2023-12-18 Paul Bennet , Ekta Patel , Sangmo Tony Sohn , Andres del Pino , Roeland P. van der Marel , Mattia Libralato , Laura L. Watkins , Antonio Aparicio , Gurtina Besla , Carme Gallart , Mark A. Fardal , Matteo Monelli , Elena Sacchi , Erik Tollerud , Daniel R. Weisz

Cool Customers in the Stellar Graveyard II: Limits to Substellar Objects Around Nearby DAZ White Dwarfs

Results from a concerted Hubble Space Telescope (HST) survey of nearby white dwarfs for substellar objects is presented. A total of 7 DAZ white dwarfs with distances of $<$ 50 pc had high contrast and high spatial resolution NICMOS…

天体物理学 · 物理学 2008-11-26 J. H. Debes , S. Sigurdsson , B. Woodgate